2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1597

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1597

Important: Removal of the HV manual disconnect lever also opens the HVIC source circuit between X350 and BECM connector X1.

If the circuit tests normal, perform the High Voltage Disabling () procedure and test the HVIC Source circuit for a short to voltage between X350

and BECM connector X1. If the circuit tests normal, replace the BECM.

4. Ignition ON, test for less than 35 mA with a DMM between the HVIC Return circuit terminal 1 and ground.

瀚慖f more than the specified range, test the HVIC Return circuit for a short to voltage between PIM connector X1 and X350.

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal

Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures

must be followed.

Failure to follow the procedures exactly as written may result in serious injury or death.

If the circuit tests normal, perform the High Voltage Disabling () procedure and test the HVIC Return circuit for a short to voltage between X350

and BECM connector X1. If the circuit tests normal, replace the BECM.

5. If all circuits test normal, replace the PIM.

Repair Instructions

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 or BECM replacement, setup, and programming

P1B10

DTC P1B0F or P1B10

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 P1B0F

- Drive Motor 1 Position Learn Incorrect

DTC P1B10

- Drive Motor 2 Position Learn Incorrect

Circuit/System Description

The drive motor generator 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.

The position sensor is a non-serviceable part of the drive motor generator assembly.

A measurement called offset is needed for accurate determination of the motor position. Offset is the relationship between the position sensor and

the drive motor generator output shaft. Whenever the ignition is cycled to OFF, the MCM attempts to learn the offset of the drive motor position