P0A02
DTC P0A01-P0A03
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0A01
- Motor Electronics Temperature Sensor Circuit Range/Performance
DTC P0A02
- Motor Electronics Temperature Sensor Circuit Low
DTC P0A03
- Motor Electronics Temperature Sensor Circuit High
Diagnostic Fault Information
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 V 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 intake air temperature and engine coolant temperature sensors is less than or equal to 16°C (60.8°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 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 intake air temperature is greater than -20°C (-4°F).
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0A01
The engine control module detects that the temperature difference between the generator control module temperature sensor parameter and the engine coolant temperature sensor is greater than 30°C (86°F).
P0A02
The engine control module detects that the generator control module temperature sensor parameter is less than -60.5°C (-76.9°F).
P0A03
The engine control module 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
* DTCs P0A01, P0A02 and P0A03 are Type B DTCs.
* P0A01 requires that the engine control module detect that the temperature difference between the generator control module temperature sensor parameter and the engine coolant temperature sensor is less than or equal to 16°C (60.8°F) at ignition ON.
Reference Information
Schematic Reference
Hybrid Cooling Schematics Hybrid Cooling Schematics
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
Drive Motor Generator Control Module Cooling System Description and Operation Drive Motor Generator Control Module Cooling System Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Engine running, observe the scan tool DMCM Coolant Temperature Signal parameter. The reading should be between -61 to +161°C (-77.8 to +321.8°F) depending on the current ambient temperature and the vehicle operating conditions.
2. Operate the vehicle within the Conditions for Running the DTC.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the generator control module temperature sensor.
2. Ignition OFF for 90 seconds, test for less than 5 ohm between the low reference circuit terminal A and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the engine control module.
3. Ignition ON, verify the scan tool DMCM Coolant Temperature parameter is greater than 162°C (323.6°F).
• If less than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the engine control module.
4. Install a 3 A 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 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 engine control module.
5. If all circuits test normal, test or replace the generator control module temperature sensor.
Component Testing
Temperature Sensor Test
Note: A thermometer can be used to test the sensor off vehicle in heated water.
1. Test the generator control module coolant temperature sensor by varying the sensor temperature while monitoring the sensor resistance.
2. Compare the readings with the Temperature Versus Resistance Temperature Versus Resistance.
• If not within the specified range, replace the generator control module coolant temperature sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Coolant Temperature Sensor Replacement (Generator Control Module) Service and Repair
* Control Module References Control Module References for engine control module replacement, setup, and programming