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 |
|---|---|---|---|---|---|
Drive Motor Generator Control Module Temperature Sensor Signal | P0A02 | P0A03 | P0A03 | P0A03 | P0A01 |
Low Reference | -- | P0A03 | P0A03 | P0A03 | P0A01 |
Circuit/System Description
The drive motor generator control module temperature sensor is a variable resistor that measures the temperature of the coolant entering the drive motor generator control module coolant radiator. The engine control module (ECM) supplies 5 volts to the drive motor generator control module temperature signal circuit, and a ground for the drive motor 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 drive motor generator control module temperature sensor parameter and the ECT sensor is greater than 30°C (54°F).
P0A02
The ECM detects that the drive motor generator control module temperature sensor parameter is less than -60.5°C (-76.9°F).
P0A03
The ECM detects that the drive motor 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 drive motor 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 drive motor 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 drive motor 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 drive motor generator 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 drive motor generator Coolant Temperature parameter is less than -60.5°C (-76.9°F).
- If all circuits test normal, test or replace the drive motor 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 |
