P0A3F
DTC P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, or P1B03
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 Descriptor
DTC P0A3F
- Drive Motor 1 Position Sensor Circuit
DTC P0A40
- Drive Motor 1 Position Sensor Performance
DTC P0C52
- Drive Motor 1 Position Sensor Circuit 1 Low Voltage
DTC P0C53
- Drive Motor 1 Position Sensor Circuit 1 High Voltage
DTC P0C5C
- Drive Motor 1 Position Sensor Circuit 2 Low Voltage
DTC P0C5D
- Drive Motor 1 Position Sensor Circuit 2 High Voltage
DTC P1B03
- Drive Motor 1 Position Sensor Circuit Loss of Tracking
Diagnostic Fault Information
Circuit/System Description
The drive motor generator position sensor is monitored by the motor control module. The motor control module monitors the angular position, speed and direction of the drive motor generator rotor based upon the signals of the resolver-type position sensor. The position sensor contains a drive coil, two driven coils, and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the drive motor generator. At ignition ON, the motor control module outputs a 7 volt ac, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular shaped rotor. The motor control module then monitors the two driven coil circuits for a return signal. The position of the irregular metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coils signals allows the motor control module to determine the exact position, speed and direction of the drive motor generator rotor. The position sensor is a non-serviceable part of the drive motor generator.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
P0C52, P0C5C
Circuit voltage less than 0.5 V.
P0C53, P0C5D
Circuit voltage greater than 3.0 V.
P0A3F
The motor control module cannot determine the motor position based upon the sensor signals.
P0A40
The motor control module detects a degraded motor position sensor signal.
P1B03
The motor control module cannot track the motor position based upon the sensor signals.
Action Taken When the DTC Sets
* DTCs P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, and P1B03 are Type A DTCs.
* The hybrid powertrain control module commands the battery energy control module to open the high voltage contactor relays.
Conditions for Clearing the DTC
DTCs P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, and P1B03 are Type A DTCs.
Diagnostic Aids
* The drive motor generator position sensor circuits operate at very low current. Extreme care must be taken when probing terminals and manipulating harnesses.
* The sensor circuit loops are a twisted pair with each pair covered in a foil shield. The shield circuits outside of the transmission are grounded to a stud on the drive motor generator power inverter module assembly.
* The drive motor generator position sensor harness circuits are shielded. Improperly grounded shield circuits may cause inaccurate sensor signals.
Reference Information
Schematic Reference
Hybrid Controls Schematics Hybrid Controls Schematics
Connector End View Reference
* Component Connector End Views Connector Views
* Inline Harness Connector End Views X101
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
Special Tools
DT-48493 - Jumper Harness
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Testing
Note: You must perform the Component Testing before proceeding with Circuit/System Testing.
1. Ignition OFF, disconnect the X176 harness connector at the transmission.
2. Install the DT-48493 - jumper harness to the harness side only.
3. Ignition ON, test for less than 7 V between the terminals listed below and ground:
* Terminal 8
* Terminal 9
4. Ignition ON, test for less than 1 V between the terminals listed below and ground:
* Terminal 10
* Terminal 11
* Terminal 12
* Terminal 14
• If greater that the specified range, test the signal circuit for a short to voltage. If the circuit tests normal replace the T6 drive motor generator power inverter module assembly.
5. Ignition OFF, test for infinite resistance between the terminals listed below and ground:
* Terminal 8
* Terminal 9
* Terminal 10
* Terminal 11
* Terminal 12
* Terminal 14
• If less than that the specified value, test the signal circuit for a short to ground. If the circuit tests normal replace the T6 drive motor generator power inverter module assembly.
6. Disconnect the X1 harness connector at the T6 drive motor generator power inverter module.
7. Test for less than 1 ohm between the terminals listed below:
* Terminals 8 and 56
* Terminals 9 and 55
* Terminals 10 and 54
* Terminals 11 and 53
* Terminals 12 and 52
* Terminals 14 and 51
• If greater that the specified range, test the signal circuit for an open/high resistance.
8. If all circuits test normal, replace the T6 drive motor generator power inverter module assembly.
Component Testing
1. Ignition OFF, disconnect the X176 harness connector at the transmission.
2. Install the DT-48493 - jumper harness to the transmission side only.
3. Test for 7.0-9.0 ohm between the AC terminal 8 and the AC terminal 9.
• If less than the specified range, test the transmission control wiring harness extension harness circuits for a short between the AC circuits. If the circuits test normal replace the M15A drive motor with generator assembly.
• If greater than the specified range, test each transmission control wiring harness extension harness AC circuits for an open. If the circuits test normal replace the M15A drive motor with generator assembly.
4. Test for 20-23 ohm between the signal terminal 12 and the signal terminal 14.
• If less than the specified range, test the transmission control wiring harness extension harness circuits for a short between the signal circuits. If the circuits test normal replace the M15A drive motor with generator assembly.
• If greater than the specified range, test each transmission control wiring harness extension harness signal circuits for an open. If the circuits test normal replace the M15A drive motor with generator assembly.
5. Test for 23-26 ohm between the signal terminal 10 and the signal terminal 11.
• If less than the specified range, test the transmission control wiring harness extension harness circuits for a short between the signal circuits. If the circuits test normal replace the M15A drive motor with generator assembly.
• If greater than the specified range, test each transmission control wiring harness extension harness signal circuits for an open. If the circuits test normal replace the M15A drive motor with generator assembly.
6. Test for greater than 7 ohm between the terminals listed below and ground:
* Terminal 8
* Terminal 9
* Terminal 10
* Terminal 11
* Terminal 12
* Terminal 14
• If less that the specified value, test the transmission control wiring harness extension harness circuit for a short to ground. If the circuit tests normal replace the M15A drive motor with generator assembly.
7. Test for infinite resistance between the terminals listed below:
* Terminals 8 and 10
* Terminals 8 and 12
* Terminals 10 and 12
• If less that the specified value, test the transmission control wiring harness extension harness circuits for a short between the circuits. If the circuits test normal replace the M15A drive motor with generator assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Drive Motor with Generator Assembly Removal - 2nd Position 13. Drive Motor with Generator Assembly Removal - 2nd Position
* Transmission Control Wiring Harness Extension Harness Removal 5. Transmission Control Wiring Harness Extension Harness Removal
* Control Module References Control Module References for Drive Motor Generator Power Inverter Module Assembly replacement, setup and programming