Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0AFB: Hybrid Battery System Voltage High - ACCM 300VDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
HVDC+ | P1AF0, P1AF2 | P0AFA | -- | -- |
HVDC- | P1AF0, P1AF2 | P0AFA | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running. Parameter Normal Value: 300.0 Volts | |||
HVDC+ | 300.0 Volts | 300.0 Volts | -- |
HVDC- | 300.0 Volts | 300.0 Volts | -- |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running. Parameter Normal Value: 300.0 Volts | |||
HVDC+ | 300.0 Volts | 12.0 Volts | -- |
HVDC- | 300.0 Volts | 12.0 Volts | -- |
Circuit/System Description
The air conditioner control module (ACCM) monitors the high voltage direct current (HVDC) voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. If the ACCM detects high HVDC voltage, then DTC P0AFB will set.
Conditions for Running the DTC
| • | The engine is running or is in autostop mode. |
| • | The 12V system voltage is between 9.5-18 volts. |
Conditions for Setting the DTC
The ACCM detects that the hybrid battery voltage is greater than 391 volts for 0.5 seconds.
Action Taken When the DTC Sets
The air conditioning is disabled.
Conditions for Clearing the DTC
| • | The DTC will pass when the ACCM detects a hybrid battery voltage less than 381 volts. |
| • | A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
Diagnostic Aids
A high voltage DTC in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify that no hybrid powertrain control module (HPCM) DTCs are set due to high battery voltage.
- Engine running, observe the scan tool ACCM High Battery Voltage parameter. The reading should be between 225 Volts and 380 Volts.
| ⇒ | If the specified DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
| ⇒ | If greater than the specified range, replace the ACCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ACCM replacement, setup, and programming.
