Circuit/System Testing
1. Ignition OFF.
2. Wait 2 minutes.
3. Disconnect PIM connector X1.
4. Ignition OFF.
5. Wait 2 minutes.
6. Reconnect PIM connector X1.
7. Ignition ON, retest for DTC P1AFB or P1B01.
锟斤拷If the DTC resets, program the PIM with the latest software version and recheck for DTCs. If the DTC resets after programming or if the
PIM already contains the latest software version, replace the 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, setup, and programming.
P1AFC
DTC P1AFC, P1AFD, or P1B02
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 P1AFC
- Drive Motor 1 Control Module Serial Peripheral Interface (SPI) Bus
DTC P1AFD
- Drive Motor 1 Control Module Serial Communications Interface (SCI) Bus
DTC P1B02
- Drive Motor 2 Control Module Serial Peripheral Interface (SPI) Bus
Circuit/System Description
This is an internal fault detection of the drive motor generator power inverter module (PIM) assembly. This fault is handled inside the PIM and no
external circuits are involved. The PIM contains two motor control modules (MCMs) and the hybrid powertrain control module (HPCM). In
addition to GM LAN, these modules share dedicated, internal PIM communications circuits.
Conditions for Running the DTC
* The control module runs the program to detect an internal fault when the key is ON.
* Ignition voltage is 8-18V.
Conditions for Setting the DTC
P1AFC
MCM 1 detects a loss of SPI bus communication with the HPCM.
P1AFD
MCM 1 detects a loss of SCI bus communication with MCM 2 for 2 seconds.
P1B02
MCM 2 detects a loss of SPI bus communication with the HPCM.
