P0A2D
DTC P0A2B-P0A2D
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 P0A2B
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Drive Motor Temperature Sensor Performance
DTC P0A2C
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Drive Motor Temperature Sensor Circuit Low Voltage
DTC P0A2D
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Drive Motor Temperature Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The generator control module also called the starter generator control module is comprised of the following three control modules; the hybrid powertrain control module, 14 volt power module and the drive motor control module. These three control modules are non serviceable and are part of the generator control module.
The motor temperature sensor is a non-serviceable part of the starter generator assembly, often referred to as the drive motor assembly. The motor temperature sensor is a thermistor, or a resistor that changes value when the temperature changes. The motor temperature sensor is located in the stator. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The motor control module supplies a 5 V reference signal to the sensor and measures the voltage drop in the circuit. When the motor is cold, the sensor resistance is high. As the motor temperature increases, the resistance of the sensor decreases, which lowers the signal voltage.
Conditions for Running the DTC
P0A2B
* DTC P0A2B, P0A2C, P0A2D, P0A2F, P0AEE, P0AEF, P0AF0, P1A71, P1A72, P1A73, P1A90, P1A91, P1A92, P0C11, or P262B is not set.
* The Engine off time is greater than 8 hours.
* The Ignition is ON.
* Ignition voltage is between 9-16V.
P0A2C
The drive motor control module and the hybrid powertrain control module are awake.
P0A2D
Vehicle has been driven with starter generator torque greater than 10 Nm (89 lb in) for at least 90 seconds.
Conditions for Setting the DTC
P0A2B
The Motor temperature is more than 25°C (45°F) greater than the average of the 14 volt power module temperature sensors and the power inverter module temperature.
P0A2C
Motor temperature sensor signal is greater than 236°C (457°F) for 1 second.
P0A2D
Motor temperature sensor signal is less than -48°C (-54°F) for 1 second after a warm up condition when drive motor generator torque is greater than 10 Nm (89 lb in) for 90 seconds.
Action Taken When the DTC Sets
DTCs P0A2B-P0A2D are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0A2B-P0A2D are Type B DTCs.
Diagnostic Aids
The motor temperature sensor can be damaged by excessive electric current. Test the sensor for an open condition whenever a short to voltage condition is observed.
Reference Information
Schematic Reference
* Hybrid Controls Schematics Hybrid Controls Schematics
* Hybrid Energy Storage Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
* Starter Generator Description and Operation Starter Generator Description and Operation
* Generator Control Module Description and Operation Generator Control Module Description and Operation
* Hybrid Modes of Operation Description Hybrid Modes of Operation Description
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 Programming and Relearning for scan tool information
Circuit/System Verification
P0A2B-P0A2D
1. Allow the vehicle to cool to ambient temperature by leaving the ignition OFF for at least 8 hours.
2. Ignition ON, observe the motor temperature scan tool parameters.
• The temperature parameter should be within 25°C (45°F) of ambient temperature.
Circuit/System Testing
1. Ignition OFF, disconnect the starter generator X1 harness connector from the A15 starter generator.
2. Ignition ON, test the harness side for less than 12 ohms between the low reference circuit terminal 7 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 K59 starter generator control module.
3. Ignition ON, verify the scan tool motor temperature sensor parameter is -50°C (-58°F).
• If more than the specified value, test the motor temperature sensor signal circuit for a short to ground. If the circuit tests normal, replace the K59 starter generator control module.
4. Install a 3-amp fused jumper wire between the signal circuit X1 terminal 8 and the low reference circuit X1 terminal 7 at the A15 starter generator. Verify the scan tool motor temperature sensor parameter is greater than 236°C (456°F):
Note:
If a short to voltage is found, test the motor temperature sensor for an open circuit or physical damage.
• If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K59 starter generator control module.
5. Ignition OFF, measure and record the resistance between the sensor signal and low reference terminals. Compare the actual sensor and circuit resistance to the expected sensor resistance. Refer to Temperature Versus Resistance Specifications.
• If the resistance is not near the expected value, replace the A15 starter generator.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Starter Generator Replacement Starter Generator Replacement for Drive Motor replacement
* Control Module References Programming and Relearning for Generator Control Module, also called Starter Generator Control Module, replacement, programming and setup.