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DTC P0A45, P0A46, P0C57, P0C58, P0C61, P0C62 or P1B04

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 Descriptor

DTC P0A45: Drive Motor 2 Position Sensor Circuit

DTC P0A46: Drive Motor 2 Position Sensor Performance

DTC P0C57: Drive Motor 2 Position Sensor Circuit 1 Low Voltage

DTC P0C58: Drive Motor 2 Position Sensor Circuit 1 High Voltage

DTC P0C61: Drive Motor 2 Position Sensor Circuit 2 Low Voltage

DTC P0C62: Drive Motor 2 Position Sensor Circuit 2 High Voltage

DTC P1B04: Drive Motor 2 Position Sensor Circuit Loss of Tracking

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Drive Motor Generator 2 Position Sensor 1

P0A45, P0C57

P0A45

P0C58, P0A45

P1B04, P0A46

Drive Motor Generator 2 Position Sensor 2

P0A45, P0C61

P0A45

P0C62, P0A45

P1B04, P0A46

Drive Motor Generator 2 Position Sensor Excitation

P0A45

P0A45

P0A45

P1B04, P0A46

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 vehicle 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 vehicle is ON.

Conditions for Setting the DTC

P0C57 or P0C61

Circuit voltage less than 0.5 V.

P0C58 or P0C62

Circuit voltage greater than 4.5 V.

P0A45

The motor control module cannot determine the motor position based upon the sensor signals.

P0A46

The motor control module detects a degraded motor position sensor signal.

P1B04

The motor control module cannot track the motor position based on the sensor signals.

Action Taken When the DTC Sets
    • DTCs P0A45, P0A46, P0C57, P0C58, P0C61, P0C62, and P1B04 are Type A DTCs.
    • Motor control module 2 stops requesting power for drive motor 2.

Conditions for Clearing the DTC

DTCs P0A45, P0A46, P0C57, P0C58, P0C61, P0C62, and P1B04 are Type A DTCs.

Diagnostic Aids
    • The drive motor generator position sensor circuits operate at very low current. These circuits are susceptible to moisture intrusion, corrosion and terminal damage. Extreme care must be taken when probing terminals and manipulating harnesses. Poor terminal connections can result in intermittent operation.
    • If the customer comments that the problem occurs only during moist environmental conditions: rain, snow, vehicle washing, etc., inspect the sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:
        1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons (12 g) of salt to 8 fl oz (237 ml) of water.
        2. Test drive the vehicle at various speeds over various road surfaces such as bumps and turns.
        3. Rinse the area thoroughly when completed.
    • The sensor circuit loops are a twisted pair with each pair covered in a foil shield. The shield circuits outside of the transmission are earthed to a stud on the drive motor generator power inverter module assembly.
    • The drive motor generator position sensor harness circuits are shielded. Improperly earthed shield circuits may cause inaccurate sensor signals.

Reference Information

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

    •  Component Connector End Views
    •  Inline Harness Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

    Note: You must perform the Component Testing before proceeding with Circuit/System Testing.

  1. Vehicle OFF, disconnect the X1 and X2 harness connectors at the transmission.
  2. Vehicle ON, at the harness side test for 0.8-1.4 V between the terminals listed below and earth:
    3. • X1 Terminal 1
    • X1 Terminal 2
    • X1 Terminal 3
    • X1 Terminal 4
    ⇒If not within the specified range, test the signal circuits for a short-circuit to voltage, short-circuit to earth or an open-circuit/high resistance. If the circuits test normal replace the T6 power inverter module.
  3. Vehicle ON, test for 6.5-7.5 V between the terminals listed below and earth:
    4. • X2 Terminal 1
    • X2 Terminal 2
    ⇒If outside the specified range, test the signal circuits for a short-cicuit to voltage, short-circuit to earth or an open-circuit/high resistance. If the circuits test normal replace the T6 power inverter module.

Component Testing
  1. Verify that DTCs P1AF0, P1AF2 P1B43, P1E1E, P1E22 P1B0B, or P1B0C are not set.
    2. ⇒If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  2. Vehicle OFF, disconnect the X2 harness connector at the transmission.
  3. At the transmission side test for 10-25 Ω between terminal 1 and terminal 2.
    4. ⇒If not within the specified range, replace the M15B drive motor with a generator assembly.
  4. Disconnect the X1 harness connector at the transmission.
  5. Test for 30-60 Ω between the signal terminal 1 and the signal terminal 2.
    6. ⇒If not within the specified range, replace the M15B drive motor with a generator assembly.
  6. Test for 20-40 Ω between the signal terminal 3 and the signal terminal 4.
    7. ⇒If not within the specified range, replace the M15B drive motor with a generator assembly.
  7. Test for greater than 10,000 Ω between the terminals listed below and earth:
    8. • X1 Terminal 1
    • X1 Terminal 2
    • X1 Terminal 3
    • X1 Terminal 4
    • X2 Terminal 1
    • X2 Terminal 2
    ⇒If less than the specified value, replace the M15B drive motor with a generator assembly.
  8. Test for infinite resistance between the terminals listed below:
    9. • X1 Terminals 1 and 3
    • X1 Terminal 1 and X2 Terminal 1
    • X1 Terminal 3 and X2 Terminal 1
    ⇒If less than the specified value, replace the M15B drive motor with a generator assembly.
  9. If the test is passed refer to Circuit/System Testing.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    • Drive Motor Generator Rotor and Stator Removal - Unit B for Drive Motor 2 replacement
    • Control Valve Body Cover Removal for Wiring Harness Extension Harness replacement
    • Control Module References for Drive Motor Generator Power Inverter Module Assembly, also called the power inverter module, replacement, programming, and set-up
   


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