Circuit Description
The following DTCs are for the internal fluid temperature sensors located internal to the starter/generator control module (SGCM):
| • | P1A7F is for the internal fluid level sensor 1 low voltage. |
| • | P1A80 is for the internal fluid level sensor 1 high voltage. |
| • | P1A81 is for the internal fluid level sensor 2 low voltage. |
| • | P1A82 is for the internal fluid level sensor 2 high voltage. |
| • | P1A83 is for the internal fluid level sensor 3 low voltage. |
| • | P1A84 is for the internal fluid level sensor 3 high voltage. |
| • | P1A85 is for the internal fluid level sensor 4 low voltage. |
| • | P1A86 is for the internal fluid level sensor 4 high voltage. |
The SGCM electronics are immersed in an internal fluid to distribute the heat of the electronics evenly through the SGCM, this electronics internal fluid is not the coolant that is circulated through the SGCM cooling system. The SGCM monitors 4 separate
internal fluid level sensors to determine if the electronics internal fluid level is low.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC P1A7F Starter/Generator Control Module Coolant Level Sensor 1 Low Voltage |
| • | DTC P1A80 Starter/Generator Control Module Coolant Level Sensor 1 High Voltage |
| • | DTC P1A81 Starter/Generator Control Module Coolant Level Sensor 2 Low Voltage |
| • | DTC P1A82 Starter/Generator Control Module Coolant Level Sensor 2 High Voltage |
| • | DTC P1A83 Starter/Generator Control Module Coolant Level Sensor 3 Low Voltage |
| • | DTC P1A84 Starter/Generator Control Module Coolant Level Sensor 3 High Voltage |
| • | DTC P1A85 Starter/Generator Control Module Coolant Level Sensor 4 Low Voltage |
| • | DTC P1A86 Starter/Generator Control Module Coolant Level Sensor 4 High Voltage |
Conditions for Running the DTC
| • | The engine has been 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. |
Conditions for Setting the DTC
| • | For low voltage coolant level sensor indicates a temperature that is higher than its normal operating range |
| • | For high voltage coolant level sensor indicates a temperature that is lower than its normal operating range |
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. |
Diagnostic Aids
If the vehicle is on an extreme angle this DTC may set.
