P1AFE

DTC P1AF8 or P1AFE

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P1AF8
- Drive Motor 1 Control Module Shutdown Performance

DTC P1AFE
- Drive Motor 2 Control Module Shutdown Performance

Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the hybrid powertrain control module (HPCM). Each motor control module monitors its ability to read and write to the memory. The MCM processor monitors the data to during shutdown to verify that the memory is correct.

Conditions for Running the DTC

* The control module runs the program to detect an internal fault when the key is turned to OFF.
* Ignition voltage is 8-18 volts.

Conditions for Setting the DTC

The control module has detected a malfunction.

Action Taken When the DTC Sets

* DTCs P1AF8 and P1AFE are Type A DTCs.
* The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.

Conditions for Clearing the DTC

DTCs P1AF8 and P1AFE are Type A DTCs.

Diagnostic Aids

An intermittent loss of battery power to the drive motor generator power inverter module assembly (PIM) may set this DTC.

An open 3 phase circuit, prior to ignition ON, may set this DTC.

Circuit/System Verification

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Turn the ignition ON.
4. Retest for DTC P1AF8 or P1AFE.

^ If the DTC resets, program the PIM with the latest software version and recheck for DTCs.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

* Identify how to disable high voltage

* Identify how to test for the presence of high voltage

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

* Failure to follow the procedures exactly as written may result in serious injury or death.

Review and understand high voltage safety before proceeding. Refer to High Voltage Safety.

1. Visually inspect for damaged 3 phase cables between the drive motor generator power inverter control module (PIM) and the transmission.

^ If damage is observed, perform the High Voltage Disabling procedure and replace the 3 phase cables.

2. Turn the ignition OFF and perform the High Voltage Disabling procedure.
3. Remove the applicable 3 phase terminal bolts at the PIM.
4. Measure each phase for less than 0.5 ohms by testing between the following circuits:

* Phase U and phase V
* Phase U and phase W

^ If less than the specified value replace the PIM.

5. Disconnect the 3 phase cable assembly from the transmission.
6. Test each cable for continuity. You should measure less than 0.5 ohms.

^ If more than the specified value replace the 3 phase cable assembly.
^ If less than the specified value, replace the applicable drive motor generator.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* 3 phase cable assembly. Refer to Drive Motor Generator Power Inverter Module Cable Removal.
* Drive motor generator. Refer to Drive Motor with Generator Assembly Removal - 1st Position or Drive Motor with Generator Assembly Removal - 2nd Position.