2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2059
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle).
2. Operate the vehicle within the Conditions for Running the DTC while observing the scan tool Catalyst monitor Not At Idle Test Conditions
Met parameter. The parameter will change to Yes when the OFF Idle Conditions have been met.
瀚慖f not the specified value, operate the vehicle within the OFF Idle Conditions.
3. When the parameter has changed to Yes and the conditions are safe, stop and idle the vehicle in gear.
4. Apply the service brake.
5. Monitor the scan tool Catalyst Monitor Test State parameter. When the parameter indicates Active, the Catalyst Monitor Test is running.
6. Continue to monitor the parameter. When the parameter indicates Inactive, the Catalyst Monitor Test has completed.
7. When the test has completed, the Catalyst Monitor Test Counter Bank 1 or Bank 2 parameter will increment by one and the Catalyst Monitor
Test Result Bank 1 or Bank 2 parameter will indicate Pass, Fail, or No Decision.
瀚慖f no decision has been made, repeat steps 2-6 until the Test Result parameter indicates a Pass or Fail.
Circuit/System Testing
Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (See: Powertrain Management/Computers and Control
Systems/Oxygen Sensor/Service Precautions/Heated Oxygen Sensor Resistance Learn Reset Caution).
Note: A new converter with less than 161 km (100 mi) on it may set DTC P0420 or P0430 due to out-gassing of the internal matting.
Operating the vehicle at highway speeds for approximately 1 h may correct the condition.
1. Engine idling, observe the DTC information with a scan tool. Verify there are no HO2S or misfire DTCs set.
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle) to diagnosis the applicable DTC before proceeding with this diagnostic procedure.
2. Verify the following conditions do not exist with the catalytic converter:
* Dents
* A severe discoloration caused by excessive temperatures
* An internal rattle caused by damaged catalyst substrate
* Restrictions-Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and Inspection/Restricted Exhaust
).
瀚慖f a condition is found, replace the catalytic converter.
3. Verify the following conditions do not exist with the exhaust system:
* Leaks-Refer to Exhaust Leakage (See: Engine, Cooling and Exhaust/Exhaust System/Testing and Inspection/Exhaust Leakage).
* Physical damage
* Loose or missing hardware
* Improperly torqued HO2S
瀚慖f a condition is found, repair the exhaust system.
4. Verify the following conditions do not exist with the HO2S 2:
* A grounded wiring harness
* Damage
瀚慖f a condition is found, replace the HO2S 2.
5. If no physical condition is detected and the HO2S 2 is as active as the HO2S 1 after operating the engine at 1,500 RPM for 1 min and then
returning to a stabilized idle, then replace the catalytic converter.
Repair Instructions
Note: A new converter with less than 161 km (100 mi) on it may set DTC P0420 or P0430 due to out-gassing of the internal matting. Operating
the vehicle at highway speeds for approximately 1 hour may correct the condition.
* Exhaust Manifold Replacement - Left Side (See: Engine, Cooling and Exhaust/Exhaust System/Exhaust Manifold/Service and
Repair/Exhaust Manifold Replacement - Left Side)
* Exhaust Manifold Replacement - Right Side (See: Engine, Cooling and Exhaust/Exhaust System/Exhaust Manifold/Service and
Repair/Exhaust Manifold Replacement - Right Side)
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) (See: Powertrain Management/Computers and Control
Showing posts with label 瀚慖f any DTCs are set. Show all posts
Showing posts with label 瀚慖f any DTCs are set. Show all posts
Thursday, November 12, 2020
Wednesday, November 4, 2020
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1855
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1855
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle).
* Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value
should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.
瀚慖f the value does not vary from approximately 40 mV to approximately 900 mV, refer to DTC P0131, P0132, P0137, P0138, P0151,
P0152, P0157, or P0158 (See: P Code Charts/P0131), DTC P0133, P013A-P013F, P014A, P014B, P0153, P1133, or P1153 ( See: P
Code Charts/P0133) or DTC P0134, P0140, P0154, or P0160 (See: P Code Charts/P0134).
Note: EVAP purge enablement may cause the FT to be momentarily outside the normal range.
* The normal Short Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating
temperature.
* The Long Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating
temperature.
* Operate the vehicle within the Conditions for Running the DTC to verify 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
P0171 or P0174
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The
reading should be between 0-19 %.
If not within the specified range, inspect for the following:
* With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should
be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and
Control Systems/Specifications/Altitude Versus Barometric Pressure).
瀚慠efer to DTC P0106 (See: P Code Charts/P0106) if the MAP sensor does not indicate the correct barometric pressure.
* With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.
瀚慠efer to DTC P0101 or P1101 (See: P Code Charts/P0101) or DTC P0102 or P0103 (See: P Code Charts/P0102) if the MAF sensor
parameter is not within 2-6 g/s at idle.
* Vacuum hoses for splits, kinks, and improper connections
* Insufficient fuel in the tank
* Low fuel pressure-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).
* Fuel contamination-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)) for Gasoline or Fuel Composition Diagnosis
(See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics) for E85.
* Malfunctioning fuel injectors-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and
Inspection/Symptoms - Engine Exhaust).
* Missing, loose, or leaking exhaust components from the HO2S forward-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and
Exhaust/Exhaust System/Testing and Inspection/Symptoms - Engine Exhaust).
* Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
* The air induction system and the air intake ducts for leaks or for a missing air filter element
* A cracked EVAP canister
* Evaporative pipes obstructed or leaking
* The crankcase ventilation system for leaks
* The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
* The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
* Malfunctioning engine components-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
P0172 or P0175
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The
reading should be between -19 and 0 %.
If not within the specified range, inspect for the following:
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle).
* Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value
should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.
瀚慖f the value does not vary from approximately 40 mV to approximately 900 mV, refer to DTC P0131, P0132, P0137, P0138, P0151,
P0152, P0157, or P0158 (See: P Code Charts/P0131), DTC P0133, P013A-P013F, P014A, P014B, P0153, P1133, or P1153 ( See: P
Code Charts/P0133) or DTC P0134, P0140, P0154, or P0160 (See: P Code Charts/P0134).
Note: EVAP purge enablement may cause the FT to be momentarily outside the normal range.
* The normal Short Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating
temperature.
* The Long Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating
temperature.
* Operate the vehicle within the Conditions for Running the DTC to verify 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
P0171 or P0174
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The
reading should be between 0-19 %.
If not within the specified range, inspect for the following:
* With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should
be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and
Control Systems/Specifications/Altitude Versus Barometric Pressure).
瀚慠efer to DTC P0106 (See: P Code Charts/P0106) if the MAP sensor does not indicate the correct barometric pressure.
* With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.
瀚慠efer to DTC P0101 or P1101 (See: P Code Charts/P0101) or DTC P0102 or P0103 (See: P Code Charts/P0102) if the MAF sensor
parameter is not within 2-6 g/s at idle.
* Vacuum hoses for splits, kinks, and improper connections
* Insufficient fuel in the tank
* Low fuel pressure-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).
* Fuel contamination-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)) for Gasoline or Fuel Composition Diagnosis
(See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics) for E85.
* Malfunctioning fuel injectors-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and
Inspection/Symptoms - Engine Exhaust).
* Missing, loose, or leaking exhaust components from the HO2S forward-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and
Exhaust/Exhaust System/Testing and Inspection/Symptoms - Engine Exhaust).
* Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
* The air induction system and the air intake ducts for leaks or for a missing air filter element
* A cracked EVAP canister
* Evaporative pipes obstructed or leaking
* The crankcase ventilation system for leaks
* The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
* The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
* Malfunctioning engine components-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
P0172 or P0175
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The
reading should be between -19 and 0 %.
If not within the specified range, inspect for the following:
Thursday, July 2, 2020
2010 Cadillac Truck Escalade RWD V8-6.2L Page 2059
2010 Cadillac Truck Escalade RWD V8-6.2L Page 2059
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle).
2. Operate the vehicle within the Conditions for Running the DTC while observing the scan tool Catalyst monitor Not At Idle Test Conditions
Met parameter. The parameter will change to Yes when the OFF Idle Conditions have been met.
瀚慖f not the specified value, operate the vehicle within the OFF Idle Conditions.
3. When the parameter has changed to Yes and the conditions are safe, stop and idle the vehicle in gear.
4. Apply the service brake.
5. Monitor the scan tool Catalyst Monitor Test State parameter. When the parameter indicates Active, the Catalyst Monitor Test is running.
6. Continue to monitor the parameter. When the parameter indicates Inactive, the Catalyst Monitor Test has completed.
7. When the test has completed, the Catalyst Monitor Test Counter Bank 1 or Bank 2 parameter will increment by one and the Catalyst Monitor
Test Result Bank 1 or Bank 2 parameter will indicate Pass, Fail, or No Decision.
瀚慖f no decision has been made, repeat steps 2-6 until the Test Result parameter indicates a Pass or Fail.
Circuit/System Testing
Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (See: Powertrain Management/Computers and Control
Systems/Oxygen Sensor/Service Precautions/Heated Oxygen Sensor Resistance Learn Reset Caution).
Note: A new converter with less than 161 km (100 mi) on it may set DTC P0420 or P0430 due to out-gassing of the internal matting.
Operating the vehicle at highway speeds for approximately 1 h may correct the condition.
1. Engine idling, observe the DTC information with a scan tool. Verify there are no HO2S or misfire DTCs set.
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle) to diagnosis the applicable DTC before proceeding with this diagnostic procedure.
2. Verify the following conditions do not exist with the catalytic converter:
* Dents
* A severe discoloration caused by excessive temperatures
* An internal rattle caused by damaged catalyst substrate
* Restrictions-Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and Inspection/Restricted Exhaust
).
瀚慖f a condition is found, replace the catalytic converter.
3. Verify the following conditions do not exist with the exhaust system:
* Leaks-Refer to Exhaust Leakage (See: Engine, Cooling and Exhaust/Exhaust System/Testing and Inspection/Exhaust Leakage).
* Physical damage
* Loose or missing hardware
* Improperly torqued HO2S
瀚慖f a condition is found, repair the exhaust system.
4. Verify the following conditions do not exist with the HO2S 2:
* A grounded wiring harness
* Damage
瀚慖f a condition is found, replace the HO2S 2.
5. If no physical condition is detected and the HO2S 2 is as active as the HO2S 1 after operating the engine at 1,500 RPM for 1 min and then
returning to a stabilized idle, then replace the catalytic converter.
Repair Instructions
Note: A new converter with less than 161 km (100 mi) on it may set DTC P0420 or P0430 due to out-gassing of the internal matting. Operating
the vehicle at highway speeds for approximately 1 hour may correct the condition.
* Exhaust Manifold Replacement - Left Side (See: Engine, Cooling and Exhaust/Exhaust System/Exhaust Manifold/Service and
Repair/Exhaust Manifold Replacement - Left Side)
* Exhaust Manifold Replacement - Right Side (See: Engine, Cooling and Exhaust/Exhaust System/Exhaust Manifold/Service and
Repair/Exhaust Manifold Replacement - Right Side)
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) (See: Powertrain Management/Computers and Control
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle).
2. Operate the vehicle within the Conditions for Running the DTC while observing the scan tool Catalyst monitor Not At Idle Test Conditions
Met parameter. The parameter will change to Yes when the OFF Idle Conditions have been met.
瀚慖f not the specified value, operate the vehicle within the OFF Idle Conditions.
3. When the parameter has changed to Yes and the conditions are safe, stop and idle the vehicle in gear.
4. Apply the service brake.
5. Monitor the scan tool Catalyst Monitor Test State parameter. When the parameter indicates Active, the Catalyst Monitor Test is running.
6. Continue to monitor the parameter. When the parameter indicates Inactive, the Catalyst Monitor Test has completed.
7. When the test has completed, the Catalyst Monitor Test Counter Bank 1 or Bank 2 parameter will increment by one and the Catalyst Monitor
Test Result Bank 1 or Bank 2 parameter will indicate Pass, Fail, or No Decision.
瀚慖f no decision has been made, repeat steps 2-6 until the Test Result parameter indicates a Pass or Fail.
Circuit/System Testing
Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (See: Powertrain Management/Computers and Control
Systems/Oxygen Sensor/Service Precautions/Heated Oxygen Sensor Resistance Learn Reset Caution).
Note: A new converter with less than 161 km (100 mi) on it may set DTC P0420 or P0430 due to out-gassing of the internal matting.
Operating the vehicle at highway speeds for approximately 1 h may correct the condition.
1. Engine idling, observe the DTC information with a scan tool. Verify there are no HO2S or misfire DTCs set.
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle) to diagnosis the applicable DTC before proceeding with this diagnostic procedure.
2. Verify the following conditions do not exist with the catalytic converter:
* Dents
* A severe discoloration caused by excessive temperatures
* An internal rattle caused by damaged catalyst substrate
* Restrictions-Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and Inspection/Restricted Exhaust
).
瀚慖f a condition is found, replace the catalytic converter.
3. Verify the following conditions do not exist with the exhaust system:
* Leaks-Refer to Exhaust Leakage (See: Engine, Cooling and Exhaust/Exhaust System/Testing and Inspection/Exhaust Leakage).
* Physical damage
* Loose or missing hardware
* Improperly torqued HO2S
瀚慖f a condition is found, repair the exhaust system.
4. Verify the following conditions do not exist with the HO2S 2:
* A grounded wiring harness
* Damage
瀚慖f a condition is found, replace the HO2S 2.
5. If no physical condition is detected and the HO2S 2 is as active as the HO2S 1 after operating the engine at 1,500 RPM for 1 min and then
returning to a stabilized idle, then replace the catalytic converter.
Repair Instructions
Note: A new converter with less than 161 km (100 mi) on it may set DTC P0420 or P0430 due to out-gassing of the internal matting. Operating
the vehicle at highway speeds for approximately 1 hour may correct the condition.
* Exhaust Manifold Replacement - Left Side (See: Engine, Cooling and Exhaust/Exhaust System/Exhaust Manifold/Service and
Repair/Exhaust Manifold Replacement - Left Side)
* Exhaust Manifold Replacement - Right Side (See: Engine, Cooling and Exhaust/Exhaust System/Exhaust Manifold/Service and
Repair/Exhaust Manifold Replacement - Right Side)
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) (See: Powertrain Management/Computers and Control
Wednesday, June 24, 2020
2010 Cadillac Truck Escalade RWD V8-6.2L Page 1855
2010 Cadillac Truck Escalade RWD V8-6.2L Page 1855
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle).
* Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value
should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.
瀚慖f the value does not vary from approximately 40 mV to approximately 900 mV, refer to DTC P0131, P0132, P0137, P0138, P0151,
P0152, P0157, or P0158 (See: P Code Charts/P0131), DTC P0133, P013A-P013F, P014A, P014B, P0153, P1133, or P1153 ( See: P
Code Charts/P0133) or DTC P0134, P0140, P0154, or P0160 (See: P Code Charts/P0134).
Note: EVAP purge enablement may cause the FT to be momentarily outside the normal range.
* The normal Short Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating
temperature.
* The Long Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating
temperature.
* Operate the vehicle within the Conditions for Running the DTC to verify 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
P0171 or P0174
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The
reading should be between 0-19 %.
If not within the specified range, inspect for the following:
* With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should
be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and
Control Systems/Specifications/Altitude Versus Barometric Pressure).
瀚慠efer to DTC P0106 (See: P Code Charts/P0106) if the MAP sensor does not indicate the correct barometric pressure.
* With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.
瀚慠efer to DTC P0101 or P1101 (See: P Code Charts/P0101) or DTC P0102 or P0103 (See: P Code Charts/P0102) if the MAF sensor
parameter is not within 2-6 g/s at idle.
* Vacuum hoses for splits, kinks, and improper connections
* Insufficient fuel in the tank
* Low fuel pressure-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).
* Fuel contamination-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)) for Gasoline or Fuel Composition Diagnosis
(See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics) for E85.
* Malfunctioning fuel injectors-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and
Inspection/Symptoms - Engine Exhaust).
* Missing, loose, or leaking exhaust components from the HO2S forward-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and
Exhaust/Exhaust System/Testing and Inspection/Symptoms - Engine Exhaust).
* Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
* The air induction system and the air intake ducts for leaks or for a missing air filter element
* A cracked EVAP canister
* Evaporative pipes obstructed or leaking
* The crankcase ventilation system for leaks
* The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
* The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
* Malfunctioning engine components-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
P0172 or P0175
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The
reading should be between -19 and 0 %.
If not within the specified range, inspect for the following:
瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle).
* Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value
should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.
瀚慖f the value does not vary from approximately 40 mV to approximately 900 mV, refer to DTC P0131, P0132, P0137, P0138, P0151,
P0152, P0157, or P0158 (See: P Code Charts/P0131), DTC P0133, P013A-P013F, P014A, P014B, P0153, P1133, or P1153 ( See: P
Code Charts/P0133) or DTC P0134, P0140, P0154, or P0160 (See: P Code Charts/P0134).
Note: EVAP purge enablement may cause the FT to be momentarily outside the normal range.
* The normal Short Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating
temperature.
* The Long Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating
temperature.
* Operate the vehicle within the Conditions for Running the DTC to verify 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
P0171 or P0174
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The
reading should be between 0-19 %.
If not within the specified range, inspect for the following:
* With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should
be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and
Control Systems/Specifications/Altitude Versus Barometric Pressure).
瀚慠efer to DTC P0106 (See: P Code Charts/P0106) if the MAP sensor does not indicate the correct barometric pressure.
* With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.
瀚慠efer to DTC P0101 or P1101 (See: P Code Charts/P0101) or DTC P0102 or P0103 (See: P Code Charts/P0102) if the MAF sensor
parameter is not within 2-6 g/s at idle.
* Vacuum hoses for splits, kinks, and improper connections
* Insufficient fuel in the tank
* Low fuel pressure-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).
* Fuel contamination-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)) for Gasoline or Fuel Composition Diagnosis
(See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics) for E85.
* Malfunctioning fuel injectors-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and
Inspection/Symptoms - Engine Exhaust).
* Missing, loose, or leaking exhaust components from the HO2S forward-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and
Exhaust/Exhaust System/Testing and Inspection/Symptoms - Engine Exhaust).
* Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
* The air induction system and the air intake ducts for leaks or for a missing air filter element
* A cracked EVAP canister
* Evaporative pipes obstructed or leaking
* The crankcase ventilation system for leaks
* The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
* The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
* Malfunctioning engine components-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
P0172 or P0175
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The
reading should be between -19 and 0 %.
If not within the specified range, inspect for the following:
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