P1AC0
DTC P1AC0
Circuit Description
The starter/generator control module (SGCM) coolant pump/fan relay supplies battery voltage to the SGCM coolant pump relay and the SGCM coolant fan relay. The SGCM monitors the temperature of the low side driver for the SGCM coolant pump/fan relay. The temperature sensor of the driver is not serviceable and the data for this sensor is not available on the scan tool. This internal driver temperature sensor aids in detecting a control circuit shorted to ground or a shorted relay coil.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P1AC0 Starter/Generator Control Module Output Circuit
Conditions for Running the DTC
^ The engine has been running for 30 seconds.
^ The SGCM coolant pump/fan relay has been commanded ON.
Conditions for Setting the DTC
The SGCM detects an over temperature condition of the driver for the SGCM coolant pump/fan relay.
Action Taken When the DTC Sets
^ The control module stores the DTC information into memory when the diagnostic runs and fails.
^ The malfunction indicator lamp (MIL) will not illuminate.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
^ The driver information center, 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.
