2010 Cadillac Truck Escalade RWD V8-6.2L Page 2003
DTC Descriptors
DTC P0324
- Knock Sensor (KS) Module Performance
DTC P0325
- Knock Sensor (KS) Circuit Bank 1
DTC P0326
- Knock Sensor (KS) Performance
DTC P0327
- Knock Sensor (KS) Circuit Low Voltage Bank 1
DTC P0328
- Knock Sensor (KS) Circuit High Voltage Bank 1
DTC P0330
- Knock Sensor (KS) Circuit Bank 2
DTC P0332
- Knock Sensor (KS) Circuit Low Voltage Bank 2
DTC P0333
- Knock Sensor (KS) Circuit High Voltage Bank 2
Diagnostic Fault Information
Circuit/System Description
The knock sensor (KS) system enables the engine control module (ECM) to control the ignition timing for the best possible performance while
protecting the engine from potentially damaging levels of detonation. The ECM monitors 2 separate KS, one on each side of the engine block. Each
KS produces an AC voltage that varies, depending on the vibration levels detected during engine operation. The ECM receives the KS signal
through 2 isolated signal circuits for each KS. The ECM adjusts the spark timing based on the amplitude and frequency of each KS signal. The
ECM learns a minimum noise level for each sensor at idle speeds, and uses calibrated noise level values for the rest of the RPM range. The ECM
should monitor a normal KS signal within the noise channel.
Conditions for Running the DTC
P0324
* DTC P0325, P0326, P0327, P0328, P0330, P0332, or P0333 are not set.
* The engine speed is at least 400 RPM.
* DTC P0324 runs continuously when the above conditions are met.
P0325 or P0330
* DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 are not set.
* The engine speed is at least 400 RPM.
* The engine coolant temperature (ECT) is warmer than -40掳C (-40掳F).
* The engine run time is at least 2 s.
* The power take-off (PTO) is not active.
* DTCs P0325 and P0330 run continuously when the above conditions are met.
P0326
* DTC P0068, P0606, P1516, P2101, P2135, or P2176 are not set.
* The engine speed is at least 400 RPM.
* The MAP is at least 10 kPa.
* DTC P0324 runs continuously when the above conditions are met.
P0327, P0328, P0332, and P0333
* The engine coolant temperature (ECT) is warmer than -40掳C (-40掳F).
* The engine run time is at least 2 s.
* DTCs P0327, P0328, P0332, and P0333 run continuously when the above conditions are met.
Conditions for Setting the DTC
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2010 Cadillac Truck Escalade RWD V8-6.2L Page 2002
2010 Cadillac Truck Escalade RWD V8-6.2L Page 2002
not stored in the ECM memory, or a proper ECM power down does not occur after completing the CKP Learn Procedure, then DTC P0315 sets.
Conditions for Running the DTC
The diagnostic runs continuously.
Conditions for Setting the DTC
The ECM detects that the CKP system variation values are not stored in memory.
Action Taken When the DTC Sets
DTC P0315 is a Type A code.
Conditions for Clearing the MIL/DTC
DTC P0315 is a Type A code.
Diagnostic Aids
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:
Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
Important: The CKP System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is learned.
1. Perform the CKP System Variation Learn Procedure. Refer to Crankshaft Position System Variation Learn (See: Powertrain
Management/Computers and Control Systems/Crankshaft Position Sensor/Testing and Inspection).
2. If the CKP System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions:
* Any worn crankshaft main bearings
* A damaged or misaligned reluctor wheel
* Excessive crankshaft runout
* A damaged crankshaft-Refer to Crankshaft and Bearing Cleaning and Inspection (See: Engine, Cooling and Exhaust/Engine/Service and
Repair/Overhaul/35. Crankshaft and Bearing Cleaning and Inspection).
* Interference in the signal circuit of the CKP sensor
* The ignition switch is left in the ON position, until the battery is discharged
* An ECM power disconnect, with the ignition ON, that may have erased the CKP system variation values and set DTC P0315
* Any debris between the CKP sensor and the reluctor wheel
瀚慖f the ECM is still unable to complete the learn procedure, replace the ECM.
Repair Instructions
* Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0324
DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
not stored in the ECM memory, or a proper ECM power down does not occur after completing the CKP Learn Procedure, then DTC P0315 sets.
Conditions for Running the DTC
The diagnostic runs continuously.
Conditions for Setting the DTC
The ECM detects that the CKP system variation values are not stored in memory.
Action Taken When the DTC Sets
DTC P0315 is a Type A code.
Conditions for Clearing the MIL/DTC
DTC P0315 is a Type A code.
Diagnostic Aids
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:
Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
Important: The CKP System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is learned.
1. Perform the CKP System Variation Learn Procedure. Refer to Crankshaft Position System Variation Learn (See: Powertrain
Management/Computers and Control Systems/Crankshaft Position Sensor/Testing and Inspection).
2. If the CKP System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions:
* Any worn crankshaft main bearings
* A damaged or misaligned reluctor wheel
* Excessive crankshaft runout
* A damaged crankshaft-Refer to Crankshaft and Bearing Cleaning and Inspection (See: Engine, Cooling and Exhaust/Engine/Service and
Repair/Overhaul/35. Crankshaft and Bearing Cleaning and Inspection).
* Interference in the signal circuit of the CKP sensor
* The ignition switch is left in the ON position, until the battery is discharged
* An ECM power disconnect, with the ignition ON, that may have erased the CKP system variation values and set DTC P0315
* Any debris between the CKP sensor and the reluctor wheel
瀚慖f the ECM is still unable to complete the learn procedure, replace the ECM.
Repair Instructions
* Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0324
DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
2010 Cadillac Truck Escalade RWD V8-6.2L Page 2001
2010 Cadillac Truck Escalade RWD V8-6.2L Page 2001
Systems/Testing and Inspection/Component Tests and General Diagnostics/Electronic Ignition System Diagnosis) for diagnosis of the
ignition coil.
5. Ignition OFF, remove the spark plug from the misfiring cylinder. Verify that the following conditions do not exist with the spark plug:
* Gas, coolant, or oil fouled
* Cracked, worn, or incorrectly gapped-Refer to Spark Plug Inspection (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine
Performance Checks/Spark Plug/Testing and Inspection).
瀚慖f there is a condition with the spark plug, replace the spark plug.
6. Exchange the suspected spark plug with another cylinder that is operating correctly.
7. Operate the engine under the conditions in which the misfire occurred. This may include putting the engine under a load or allowing the
engine to return to a cold condition. Observe the Misfire Current Counters with a scan tool. The misfire should not follow the spark plug
exchange.
瀚慖f the misfire follows with the spark plug, replace the spark plug.
8. If all conditions test normal, test or inspect for the following:
* A lean or rich fuel injector-Refer to Fuel Injector Diagnosis (CH47976) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Injector/Testing and Inspection)Fuel Injector Diagnosis (J39021 or Scan Tool) (See: Powertrain Management/Fuel
Delivery and Air Induction/Fuel Injector/Testing and Inspection).
* An engine mechanical condition-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
Repair Instructions
* Spark Plug Wire Replacement (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Ignition Cable/Service
and Repair)
* Spark Plug Replacement (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Spark Plug/Service and
Repair)
Repair Verification
1. Install any components that have been removed or replaced during diagnosis.
2. Clear the DTCs.
3. Turn OFF the ignition for 60 seconds.
4. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in
order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List -
Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic
procedure.
5. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair
Verification for DTCs P0420 and P0430. Refer to DTC P0420 or P0430 (See: P Code Charts/P0420).
P0315
DTC P0315
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0315
- Crankshaft Position (CKP) System Variation Not Learned
Circuit/System Description
The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors caused by slight build tolerance variations
in the CKP sensor, crankshaft, and CKP sensor position. The calculated error allows the engine control module (ECM) to accurately compensate
for reference period variations. This enhances the ability of the ECM to detect misfire events over a wide range of engine speeds and load
conditions. The ECM stores the Crankshaft Position System Variation values after a learn procedure has been performed. If the actual crankshaft
position variation is not stored within the CKP compensating value look up table, then DTC P0300 may set. If the CKP system variation values are
Systems/Testing and Inspection/Component Tests and General Diagnostics/Electronic Ignition System Diagnosis) for diagnosis of the
ignition coil.
5. Ignition OFF, remove the spark plug from the misfiring cylinder. Verify that the following conditions do not exist with the spark plug:
* Gas, coolant, or oil fouled
* Cracked, worn, or incorrectly gapped-Refer to Spark Plug Inspection (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine
Performance Checks/Spark Plug/Testing and Inspection).
瀚慖f there is a condition with the spark plug, replace the spark plug.
6. Exchange the suspected spark plug with another cylinder that is operating correctly.
7. Operate the engine under the conditions in which the misfire occurred. This may include putting the engine under a load or allowing the
engine to return to a cold condition. Observe the Misfire Current Counters with a scan tool. The misfire should not follow the spark plug
exchange.
瀚慖f the misfire follows with the spark plug, replace the spark plug.
8. If all conditions test normal, test or inspect for the following:
* A lean or rich fuel injector-Refer to Fuel Injector Diagnosis (CH47976) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel Injector/Testing and Inspection)Fuel Injector Diagnosis (J39021 or Scan Tool) (See: Powertrain Management/Fuel
Delivery and Air Induction/Fuel Injector/Testing and Inspection).
* An engine mechanical condition-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
Repair Instructions
* Spark Plug Wire Replacement (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Ignition Cable/Service
and Repair)
* Spark Plug Replacement (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Spark Plug/Service and
Repair)
Repair Verification
1. Install any components that have been removed or replaced during diagnosis.
2. Clear the DTCs.
3. Turn OFF the ignition for 60 seconds.
4. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in
order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List -
Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic
procedure.
5. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair
Verification for DTCs P0420 and P0430. Refer to DTC P0420 or P0430 (See: P Code Charts/P0420).
P0315
DTC P0315
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0315
- Crankshaft Position (CKP) System Variation Not Learned
Circuit/System Description
The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors caused by slight build tolerance variations
in the CKP sensor, crankshaft, and CKP sensor position. The calculated error allows the engine control module (ECM) to accurately compensate
for reference period variations. This enhances the ability of the ECM to detect misfire events over a wide range of engine speeds and load
conditions. The ECM stores the Crankshaft Position System Variation values after a learn procedure has been performed. If the actual crankshaft
position variation is not stored within the CKP compensating value look up table, then DTC P0300 may set. If the CKP system variation values are
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2010 Cadillac Truck SRX AWD V6-3.0L Page 1508
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
ECM.
3. Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 3 and ground.
瀚慖f less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the K20 ECM.
瀚慖f greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Verify the scan tool B150 fuel tank pressure sensor parameter is less than 0.2V.
瀚慖f greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the K20 ECM.
5. Install a 3A fused jumper wire between the signal circuit terminal 1 and the 5V reference circuit terminal 3. Verify the scan tool fuel tank
pressure sensor parameter is greater than 4.7V.
瀚慖f less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the
K20 ECM.
6. If all circuits test normal, test or replace the B150 fuel tank pressure sensor.
Repair Instructions
* Fuel Tank Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service
and Repair)
* For DTC P0452 or P0453, always perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic
procedure.
* For DTC P0451 or P0454, clear DTCs with a scan tool.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0454
DTC P0451-P0454 (LF1)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0451
- Fuel Tank Pressure Sensor Performance
DTC P0452
- Fuel Tank Pressure Sensor Circuit Low Voltage
DTC P0453
- Fuel Tank Pressure Sensor Circuit High Voltage
DTC P0454
- Fuel Tank Pressure Sensor Intermittent
Diagnostic Fault Information
Typical Scan Tool Data
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2010 Cadillac Truck Escalade RWD V8-6.2L Page 2000
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
J 26792 HEI Spark Tester
Circuit/System Verification
1. Verify that no other DTCs are set.
瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble
Code (DTC) List - Vehicle).
2. Engine idling, verify there is no abnormal engine noise.
瀚慖f there is an abnormal engine noise, refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
3. Observe the Misfire Current Counters with a scan tool. The Misfire Current Counters should not be incrementing. Random misfires that are
not steadily incrementing may be normal.
4. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle
within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Important: You must perform the Circuit/System Verification first.
1. Verify that the following conditions do not exist:
* The fuel injector wire harness electrical connectors are connected to the wrong fuel injectors. Refer to Engine Controls Schematics (See:
Diagrams/Electrical Diagrams/Powertrain Management/System Diagram).
* Engine vacuum leaks
* Fuel pressure that is too low or too high-Refer to Fuel System Diagnosis (w/o FPCM) (See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Component Tests and General Diagnostics)Fuel System Diagnosis (FPCM) (See: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics).
* Contaminated fuel-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool) (See: Powertrain Management/Computers
and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis
(Without Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel/Testing and Inspection/Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)).
* Restricted exhaust system-Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and
Inspection/Restricted Exhaust).
瀚慖f you find any of the above conditions, repair as necessary.
2. Verify that there is no misfire on cylinders 1, 4, 6, or 7 due to cylinder deactivation-Refer to Cylinder Deactivation (Active Fuel
Management) System Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests
and General Diagnostics/Cylinder Deactivation (Active Fuel Management) System Diagnosis).
3. Ignition OFF, install the J 26792 - Tester to the spark plug wire boot of the misfiring cylinder.
Note: An erratic or weak spark is considered a no spark condition.
4. Attempt to start the engine and observe the J 26792 - Tester. The spark tester should spark.
瀚慖f there is no spark, test the spark plug wire for the correct resistance, refer to Ignition System Specifications (See: Powertrain
Management/Ignition System/Specifications) and Spark Plug Wire Inspection (See: Engine, Cooling and Exhaust/Engine/Tune-up and
Engine Performance Checks/Ignition Cable/Testing and Inspection).
瀚慖f the spark plug wire tests normal, refer to Electronic Ignition System Diagnosis (See: Powertrain Management/Computers and Control
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
J 26792 HEI Spark Tester
Circuit/System Verification
1. Verify that no other DTCs are set.
瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble
Code (DTC) List - Vehicle).
2. Engine idling, verify there is no abnormal engine noise.
瀚慖f there is an abnormal engine noise, refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
3. Observe the Misfire Current Counters with a scan tool. The Misfire Current Counters should not be incrementing. Random misfires that are
not steadily incrementing may be normal.
4. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle
within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Important: You must perform the Circuit/System Verification first.
1. Verify that the following conditions do not exist:
* The fuel injector wire harness electrical connectors are connected to the wrong fuel injectors. Refer to Engine Controls Schematics (See:
Diagrams/Electrical Diagrams/Powertrain Management/System Diagram).
* Engine vacuum leaks
* Fuel pressure that is too low or too high-Refer to Fuel System Diagnosis (w/o FPCM) (See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Component Tests and General Diagnostics)Fuel System Diagnosis (FPCM) (See: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics).
* Contaminated fuel-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool) (See: Powertrain Management/Computers
and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis
(Without Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool) (See: Powertrain Management/Fuel Delivery and Air
Induction/Fuel/Testing and Inspection/Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)).
* Restricted exhaust system-Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and
Inspection/Restricted Exhaust).
瀚慖f you find any of the above conditions, repair as necessary.
2. Verify that there is no misfire on cylinders 1, 4, 6, or 7 due to cylinder deactivation-Refer to Cylinder Deactivation (Active Fuel
Management) System Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests
and General Diagnostics/Cylinder Deactivation (Active Fuel Management) System Diagnosis).
3. Ignition OFF, install the J 26792 - Tester to the spark plug wire boot of the misfiring cylinder.
Note: An erratic or weak spark is considered a no spark condition.
4. Attempt to start the engine and observe the J 26792 - Tester. The spark tester should spark.
瀚慖f there is no spark, test the spark plug wire for the correct resistance, refer to Ignition System Specifications (See: Powertrain
Management/Ignition System/Specifications) and Spark Plug Wire Inspection (See: Engine, Cooling and Exhaust/Engine/Tune-up and
Engine Performance Checks/Ignition Cable/Testing and Inspection).
瀚慖f the spark plug wire tests normal, refer to Electronic Ignition System Diagnosis (See: Powertrain Management/Computers and Control
2010 Cadillac Truck Escalade RWD V8-6.2L Page 1999
2010 Cadillac Truck Escalade RWD V8-6.2L Page 1999
P0220, P0222, P0223, P0335, P0336, P0606, P0641, P0651, P1516, P2101, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, and
P2176 are not set.
* When DTC P0315 is set, the engine speed must be more than 1,000 RPM.
* Engine run time is more than 2 crankshaft revolutions.
* The engine speed is between 375-5,600 RPM.
* The ignition voltage is between 9-18 volts.
* The engine coolant temperature (ECT) is between -7 and +130掳C (+19 and +266掳F).
* When the startup ECT is colder than -7掳C (+19掳F), this diagnostic will be delayed until the ECT is warmer than +21掳C (+69掳F).
* The fuel level is more than 10 percent.
* The ECM is not in fuel shut-off, or decel fuel cut-off mode.
* The electronic brake control module (EBCM) and the traction control system (TCS) are not active or detecting rough road.
* An automatic transmission shift with a throttle position more than 95 percent is not occuring.
* The power management is not active.
* Excessive drive wheel slip is not detected.
* The power take-off (PTO) is disabled, where applicable.
* The cylinder deactivation is not in progress, where applicable.
* DTCs P0300-P0308 run continuously when the above conditions are met.
Conditions for Setting the DTC
DTC P0300
The ECM is detecting a crankshaft speed change indicating a random misfire is occuring that exceeds mandated emission level standards or is at
catalytic converter damaging levels.
DTC P0301, P0302, P0303, P0304, P0305, P0306, P0307, or P0308
The ECM is detecting a crankshaft speed change indicating a single cylinder misfire is occuring that exceeds mandated emission level standards or
is at catalytic converter damaging levels.
Action Taken When the DTC Sets
* DTCs P0300-P0308 are Type B DTCs.
* When the MIL is flashing the fuel injector may be disabled for the misfiring cylinder to protect the catalytic converter.
* Depending on the conditions that set the DTC, the engine may go into Open Loop.
Conditions for Clearing the MIL/DTC
* DTCs P0300-P0308 are Type B DTCs.
* The DTC must run and pass under the same operating conditions that were present when the DTC failed.
Diagnostic Aids
* Ensure that each fuel injector is connected to the proper fuel injector harness connector.
* A misfire may only occur when the engine is operating under a load or when the engine is cold.
* A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set without setting an IC
circuit P0351-P0358 DTC.
* This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:
Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).
* A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of
vibration:
- A tire or wheel that is out of round or balance
- Variable thickness brake rotors
- An unbalanced drive shaft
- Certain rough road conditions
- A damaged accessory drive component or belt
- A damaged reluctor wheel
- The Crankshaft Position System Variation Learn procedure may need to be performed.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
P0220, P0222, P0223, P0335, P0336, P0606, P0641, P0651, P1516, P2101, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, and
P2176 are not set.
* When DTC P0315 is set, the engine speed must be more than 1,000 RPM.
* Engine run time is more than 2 crankshaft revolutions.
* The engine speed is between 375-5,600 RPM.
* The ignition voltage is between 9-18 volts.
* The engine coolant temperature (ECT) is between -7 and +130掳C (+19 and +266掳F).
* When the startup ECT is colder than -7掳C (+19掳F), this diagnostic will be delayed until the ECT is warmer than +21掳C (+69掳F).
* The fuel level is more than 10 percent.
* The ECM is not in fuel shut-off, or decel fuel cut-off mode.
* The electronic brake control module (EBCM) and the traction control system (TCS) are not active or detecting rough road.
* An automatic transmission shift with a throttle position more than 95 percent is not occuring.
* The power management is not active.
* Excessive drive wheel slip is not detected.
* The power take-off (PTO) is disabled, where applicable.
* The cylinder deactivation is not in progress, where applicable.
* DTCs P0300-P0308 run continuously when the above conditions are met.
Conditions for Setting the DTC
DTC P0300
The ECM is detecting a crankshaft speed change indicating a random misfire is occuring that exceeds mandated emission level standards or is at
catalytic converter damaging levels.
DTC P0301, P0302, P0303, P0304, P0305, P0306, P0307, or P0308
The ECM is detecting a crankshaft speed change indicating a single cylinder misfire is occuring that exceeds mandated emission level standards or
is at catalytic converter damaging levels.
Action Taken When the DTC Sets
* DTCs P0300-P0308 are Type B DTCs.
* When the MIL is flashing the fuel injector may be disabled for the misfiring cylinder to protect the catalytic converter.
* Depending on the conditions that set the DTC, the engine may go into Open Loop.
Conditions for Clearing the MIL/DTC
* DTCs P0300-P0308 are Type B DTCs.
* The DTC must run and pass under the same operating conditions that were present when the DTC failed.
Diagnostic Aids
* Ensure that each fuel injector is connected to the proper fuel injector harness connector.
* A misfire may only occur when the engine is operating under a load or when the engine is cold.
* A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set without setting an IC
circuit P0351-P0358 DTC.
* This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:
Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).
* A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of
vibration:
- A tire or wheel that is out of round or balance
- Variable thickness brake rotors
- An unbalanced drive shaft
- Certain rough road conditions
- A damaged accessory drive component or belt
- A damaged reluctor wheel
- The Crankshaft Position System Variation Learn procedure may need to be performed.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
2010 Cadillac Truck Escalade RWD V8-6.2L Page 1998
2010 Cadillac Truck Escalade RWD V8-6.2L Page 1998
* Spark Plug Replacement (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Spark Plug/Service and
Repair)
Repair Verification
1. Install any components that have been removed or replaced during diagnosis.
2. Clear the DTCs.
3. Turn OFF the ignition for 60 seconds.
4. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in
order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List -
Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic
procedure.
5. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair
Verification for DTCs P0420 and P0430. Refer to DTC P0420 or P0430 (See: P Code Charts/P0420).
P0308
DTC P0300-P0308
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0300
- Engine Misfire Detected
DTC P0301
- Cylinder 1 Misfire Detected
DTC P0302
- Cylinder 2 Misfire Detected
DTC P0303
- Cylinder 3 Misfire Detected
DTC P0304
- Cylinder 4 Misfire Detected
DTC P0305
- Cylinder 5 Misfire Detected
DTC P0306
- Cylinder 6 Misfire Detected
DTC P0307
- Cylinder 7 Misfire Detected
DTC P0308
- Cylinder 8 Misfire Detected
Circuit/System Description
The engine control module (ECM) uses information from the crankshaft position (CKP) sensor in order to determine when an engine misfire is
occurring, and uses information from the camshaft position (CMP) sensor in order to determine which cylinder is misfiring. By monitoring
variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect individual misfire events. If the ECM detects a misfire rate
sufficient to cause emission levels to exceed mandated standards, DTC P0300 sets. Under certain driving conditions, a misfire rate can be high
enough to cause the catalytic converter to overheat, possibly damaging the converter. The malfunction indicator lamp (MIL) will flash ON and OFF
when catalytic converter overheating conditions are present and DTC P0300 is set. DTCs P0301-P0308 corresponds to cylinders 1-8. If the ECM is
able to determine that a specific cylinder is misfiring, the DTC for that cylinder will also set.
Conditions for Running the DTC
* DTCs P0010, P0011, P0016, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0122, P0123,
* Spark Plug Replacement (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Spark Plug/Service and
Repair)
Repair Verification
1. Install any components that have been removed or replaced during diagnosis.
2. Clear the DTCs.
3. Turn OFF the ignition for 60 seconds.
4. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in
order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List -
Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic
procedure.
5. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair
Verification for DTCs P0420 and P0430. Refer to DTC P0420 or P0430 (See: P Code Charts/P0420).
P0308
DTC P0300-P0308
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0300
- Engine Misfire Detected
DTC P0301
- Cylinder 1 Misfire Detected
DTC P0302
- Cylinder 2 Misfire Detected
DTC P0303
- Cylinder 3 Misfire Detected
DTC P0304
- Cylinder 4 Misfire Detected
DTC P0305
- Cylinder 5 Misfire Detected
DTC P0306
- Cylinder 6 Misfire Detected
DTC P0307
- Cylinder 7 Misfire Detected
DTC P0308
- Cylinder 8 Misfire Detected
Circuit/System Description
The engine control module (ECM) uses information from the crankshaft position (CKP) sensor in order to determine when an engine misfire is
occurring, and uses information from the camshaft position (CMP) sensor in order to determine which cylinder is misfiring. By monitoring
variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect individual misfire events. If the ECM detects a misfire rate
sufficient to cause emission levels to exceed mandated standards, DTC P0300 sets. Under certain driving conditions, a misfire rate can be high
enough to cause the catalytic converter to overheat, possibly damaging the converter. The malfunction indicator lamp (MIL) will flash ON and OFF
when catalytic converter overheating conditions are present and DTC P0300 is set. DTCs P0301-P0308 corresponds to cylinders 1-8. If the ECM is
able to determine that a specific cylinder is misfiring, the DTC for that cylinder will also set.
Conditions for Running the DTC
* DTCs P0010, P0011, P0016, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0122, P0123,
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