2010 Cadillac Truck Escalade RWD V8-6.2L Page 1467
* 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)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Inspect for ECM P0335 or ECM P0336. With the engine running, observe the hybrid powertrain control module (HPCM) Engine Speed parameter
with a scan tool. The parameter should display the current engine speed, matching the tachometer and/or the ECM Engine Speed parameter.
If ECM DTCs P0335 or P0336 are set, diagnose them prior to diagnosing the HPCM DTC.
If the HPCM Engine Speed parameter displays a value other than the current engine speed, continue with Circuit/System Testing.
Circuit/System Testing
Attempt to crank and start the engine. Perform the appropriate diagnostic procedure as necessary.
Diagnosis if the Engine Does NOT Start
1. Ignition OFF, disconnect the CKP sensor connector.
2. Ignition ON, test for 4.8-5.2 volts on the CKP signal circuit, from the CKP connector terminal A and ground.
瀚慖f within the specified range, reconnect the CKP connector and perform ECM DTC P0335 diagnostic procedure.
3. Ignition OFF, disconnect PIM connector X1.
4. Ignition ON, test for 4.8-5.2 volts on the CKP signal circuit, from the CKP sensor connector terminal A and ground.
瀚慖f within the specified range, replace the drive motor generator power inverter control module (PIM).
5. Test the CKP signal circuit between CKP connector terminal A and PIM connector X1 terminal 26 for a short to ground if less than the
specified value or a short to voltage if greater than the specified value.
瀚慖f the circuit tests normal, reconnect all connectors and perform ECM DTC P0335 diagnostic procedure.
Diagnosis if the Engine Starts
Note: Diagnose ECM DTCs P0335 and P0336 prior to performing this procedure.
1. Ignition OFF, disconnect PIM connector X1 and the CKP sensor connector.
2. Test for less than 5 ohms on the CKP low reference circuit, from connector X1 terminal 35 and ground.
瀚慖f greater than the specified value, repair the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts on the CKP signal circuit, from the connector X1 terminal 26 and ground.
瀚慖f less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the drive motor
generator power inverter control module (PIM).
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 PIM replacement, programming, and setup
P1AC7
DTC P1AC6 or P1AC7
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.
