2010 Cadillac Truck Escalade RWD V8-6.2L Page 1455
Harness Removal)
P0C62
DTC P0C57, P0C58, P0C61, or P0C62
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 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
Diagnostic Fault Information
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 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
