P1A67
DTC P1A67
CIRCUIT DESCRIPTION
The purpose of the accessory power module (APM), integral to the starter/generator control module (SGCM), is to control the amount and direction of energy flowing between the 42 V DC and 14 V DC buses via the APM, bi-directional 42 V DC to 14 V DC converter. All APM functions will only be run when in the enable mode. APM current will be defined as the current flowing through the outputs. APM power is bi-directional, with negative current representing 14-42 direction, and positive current representing the 42-14 direction.
When the APM Power Conversion direction is set to a value of 42 V to 14 V, the energy will flow from the 42 V DC Bus to the 14 V DC Bus via the APM. When the Service Charge or jump starting is requested, the energy will flow from the 14 V DC Bus to the 42 V DC Bus via the APM. When the APM Power Conversion direction is set to a value of Off, the APM will be turned off, and not consume or transfer any power. When the APM Power Conversion direction is set to a value of Invalid, the energy will flow from the 42 V DC Bus to the 14 V DC Bus via the APM.
The following DTCs are for internal failures within the SGCM.
- P1AB2 is hybrid system voltage.
- P1A64 is for SGCM reset.
- P1A65 is SGCM long term memory performance.
- P1A66 is SGCM loop overrun.
- P1A67 is SGCM options incorrect.
- P1A68 is failed SGCM programming read only memory (ROM).
- P1A69 is failed SGCM programming random access memory (RAM).
- P1A6A is failed SGCM read only memory (ROM).
- P1A6B is failed SGCM 5-volt reference circuit.
DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
- DTC P1AB2 Hybrid System Voltage
- DTC P1A64 Starter/Generator Control Module Reset
- DTC P1A65 Starter/Generator Control Module Long Term Memory Performance
- DTC P1A66 Starter/Generator Control Module Loop Overrun
- DTC P1A67 Starter/Generator Control Module Options Incorrect
- DTC P1A68 Starter/Generator Control Module Programming Read Only Memory (ROM)
- DTC P1A69 Starter/Generator Control Module Random Access Memory (RAM)
- DTC P1A6A Starter/Generator Control Module Read Only Memory (ROM)
- DTC P1A6B Starter/Generator Control Module 5-Volt Reference Circuit
CONDITIONS FOR RUNNING THE DTC
- Engine running for 30 seconds.
- The SGCM has received voltage on the ignition 0 voltage circuit.
- The SGCM has turned ON and no configuration DTC are present.
- This diagnostic shall be run every 100 ms.
- Reference voltage is stable and accurate.
CONDITIONS FOR SETTING THE DTC
- P1AB2 is 42-volt correlation fault within the SGCM.
- P1A64 is for energy storage control module (ESCM) and SGCM is abnormally reset.
- P1A65 is SGCM long term memory performance.
- P1A66 is SGCM loop overrun.
- P1A67 is SGCM options incorrect.
- P1A68 is electrically erasable programmable read-only memory (EEPROM) malfunction was detected. EEPROM is not equal to the checksum stored in EEPROM at power down.
- P1A69 is failed SGCM programming random access memory (RAM).
- P1A6A is failed SGCM read only memory (ROM).
- P1A6B is one or both of the reference range voltages are out of range.
ACTION TAKEN WHEN THE DTC SETS
- The powertrain control module (PCM) stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The driver information center (DIC), if equipped, may display a message.
CONDITIONS FOR CLEARING THE DTC
- A current DTC Last Test Failed clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- Clear the DTC with a scan tool.
TEST
