2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1578
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.
Action Taken When the DTC Sets
* DTCs P1AFC and P1B02 are Type A DTCs.
* DTC P1AFD is a Type B DTC.
* The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.
Conditions for Clearing the DTC
* DTCs P1AFC and P1B02 are Type A DTCs.
* DTC P1AFD is a Type B DTC.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Circuit/System Verification
1. Clear the DTC information.
2. Ignition OFF for 1 minute.
3. Ignition ON.
4. Retest for DTCs P1AFC, P1AFD and P1B02.
Circuit/System Testing
Ignition ON, retest for DTCs P1AFC, P1AFD and P1B02.
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.
