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 Descriptors
DTC P0A01: Motor Electronics Temperature Sensor Circuit Range/PerformanceDTC P0A02: Motor Electronics Temperature Sensor Circuit Low
DTC P0A03: Motor Electronics Temperature Sensor Circuit High
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Generator Control Module Temperature Sensor Signal | P0A02 | P0A03 | P0A03 | P0A03 | P0A01 |
Low Reference | -- | P0A03 | P0A03 | P0A03 | P0A01 |
Circuit/System Description
The generator control module temperature sensor is a variable resistor that measures the temperature of the coolant entering the generator control module coolant radiator. The engine control module (ECM) supplies 5 volts to the generator control module temperature signal circuit, and a ground for the generator control module temperature low reference circuit.
Conditions for Running the DTC
P0A01
| • | DTCs P0112, P0113, P0117, P0118, P0101, P0102, P0103, P0A02, P0A03 and P2610 are not set. |
| • | The ignition has been OFF for greater than 8 hours. |
| • | The temperature difference between the IAT and ECT sensors is less than or equal to 16°C (29°F) at ignition ON. |
P0A02
| • | DTCs P0112 or P0113 are not set. |
| • | The engine is running for greater than 10 seconds. |
| • | The Intake Air Temperature Sensor (IAT) is greater than 70°C (158°F). |
| • | This DTC runs continuously when the above conditions are met. |
P0A03
| • | DTCs P0112 or P0113 are not set. |
| • | The engine is running for greater than 10 seconds. |
| • | The IAT is greater than -20°C (-04°F). |
| • | This DTC runs continuously when the above conditions are met. |
Conditions for Setting the DTC
P0A01
The ECM detects that the temperature difference between the generator control module temperature sensor parameter and the ECT sensor is greater than 30°C (54°F).
P0A02
The ECM detects that the generator control module temperature sensor parameter is less than -60.5°C (-76.9°F).
P0A03
The ECM detects that the generator control module temperature sensor parameter is greater than 162°C (323.6°F).
Action Taken When the DTC Sets
DTCs P0A01, P0A02 and P0A03 are Type B DTCs.
| • | The cooling fans will be commanded to high speed. |
| • | The DIC will display A/C Inoperative |
Conditions for Clearing the MIL/DTC
| • | P0A01 requires that the ECM detect that the temperature difference between the generator control module temperature sensor parameter and the ECT sensor is less than or equal to 16°C (29°F) at ignition ON. |
| • | DTCs P0A01, P0A02 and P0A03 are Type B DTCs. |
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
- Engine running, observe the scan tool DMCM Coolant Temperature Signal parameter. The reading should be between -61 to +161°C (-78 to +321F) depending on the current ambient temperature and the vehicle operating conditions.
- Operate the vehicle within the Conditions for Running the DTC.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the generator control module temperature sensor.
- Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit terminal A and ground.
- Ignition ON, verify the scan tool DMCM Coolant Temperature parameter is greater than 162°C (323°F).
- Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool DMCM Coolant Temperature parameter is less than -60.5°C (-76.9°F).
- If all circuits test normal, test or replace the generator control module temperature sensor.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
| ⇒ | If less than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
