2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1580

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1580

Conditions for Setting the DTC

The MCM cannot track the motor position.

Action Taken When the DTC Sets

* DTCs P1B03 and P1B04 are Type A DTCs.

* The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor

relays.

Conditions for Clearing the DTC

DTCs P1B03 and P1B04 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 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 (PIM) assembly.

* Ensure the drive motor generator position sensor harness shield circuits are properly grounded prior to testing.

Reference Information

Schematic Reference

Hybrid Controls Schematics ()

Connector End View Reference

* Component Connector End Views (See: Diagrams/Connector Views)

* Inline Harness Connector End Views (See: Power and Ground Distribution/Multiple Junction Connector/Diagrams)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Special Tools

DT-48493 Jumper Harness

Circuit/System Testing

Note: The drive motor generator position sensor circuits require proper circuit integrity for correct system operation. Just a few ohms of

additional circuit resistance may cause position sensor signal degradation.

* Always inspect position sensor signal connectors for proper terminal contact.

* All diagnostic connections must be made with the approved test probes to prevent the creation of poor terminal contact.

* Connectors that contain position sensor signal circuits must always be clean and dry prior to mating. Foreign material or moisture within

the connector may cause sensor signal degradation.

1. Ignition OFF, disconnect PIM X1 connector.

2. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the PIM X1 circuits as

indicated. Use the specifications for the drive motor generator that set the DTC. Also test each circuit for a short to ground.

瀚慖f any of the circuits are not within specification, continue with testing.

瀚慖f all circuits test normal, inspect for proper terminal contact at PIM X1 connector. If PIM X1 terminal contact tests OK, perform the

Intermittent Condition Testing below.

3. Disconnect the transmission X176 24-way connector.

4. Connect the DT-48493 to the X176 24-way connector at the transmission.

5. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the transmission X176 circuits

as indicated. Use the specifications for the drive motor generator that set the DTC. Also test each circuit for a short to ground.