2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1579

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1579

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for PIM replacement, setup, and programming.

P1B03

DTC P1B03 or P1B04

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P1B03

- Drive Motor 1 Position Sensor Circuit Loss of Tracking

DTC P1B04

- Drive Motor 2 Position Sensor Circuit Loss of Tracking

Diagnostic Fault Information

Circuit/System Description

The drive motor position sensor is monitored by the motor control module (MCM). The MCM monitors the angular position, speed and direction of

the drive motor generator based upon the signals of the resolver-type position sensor. The position sensor, or resolver, 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 MCM 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 MCM then monitors the two driven coil circuits for a return signal. The position of the

irregular shaped metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two

driven coil signals allows the MCM to determine the exact position, speed and direction of the drive motor generator.

Conditions for Running the DTC