P0C4E
DTC P0C4E
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 P0C4E
- Drive Motor 1 Position Exceeded Learning Limit
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.
Offset is the relationship between the position sensor and the drive motor generator output shaft. When the ignition turned OFF, the motor control module attempts to learn the offset of the drive motor position sensor.
Conditions for Running the DTC
* The ignition is cycled OFF.
* Drive motor generator speed is less than 20 RPM.
Conditions for Setting the DTC
The position sensor offset exceeds 25 degrees during the learning process.
Action Taken When the DTC Sets
* DTC P0C4E is a Type C DTC.
* The motor control module uses the last learned valid position sensor offset.
Conditions for Clearing the DTC
DTC P0C4E is a Type C DTC.
Diagnostic Aids
* The drive motor generator position sensor circuits operate at very low current. Just a few ohms of additional circuit resistance may cause position sensor signal degradation. Extreme care must be taken when probing terminals and manipulating harnesses.
* The sensor circuit loops are 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.
* Ensure the drive motor generator position sensor harness shield circuits are properly grounded prior to testing.
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
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. Verify that DTC P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, or P1B03 are not set.
• If any of the DTCs are set, refer to DTC P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, or P1B03 P0A3F.
2. Ignition OFF, disconnect the X176 harness connector at the transmission.
3. Install the DT-48493 - jumper harness to the harness side only.
4. Disconnect the X1 harness connector at the T6 drive motor generator power inverter module.
5. 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.
6. If all circuits test normal, replace the M15A drive motor with generator 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 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 - 1st Position 8. Drive Motor with Generator Assembly Removal - 1st 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