2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1616
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.
2. Disable the high voltage for servicing at the drive motor generator control module assembly cable connections. Refer to High Voltage
Disabling ().
3. Inspect for damaged 3 phase cables between the PIM and the transmission.
锟斤拷If damage is observed, replace the 3 phase cables.
4. Inspect the 3 phase cable terminal fasteners for the proper torque and for arc-flash damage.
锟斤拷If any fasteners were loose and no arc flash damage is present, torque the fasteners and re-assemble the vehicle. Retest for the DTC.
锟斤拷If any fasteners were loose and arc flash damage is present, replace the PIM and the 3 phase cable assembly.
5. Remove the 3 phase cable assembly from the PIM distribution box. Refer to Generator Control Module 3-Phase Cable Assembly
Replacement ().
6. Test the resistance of each phase by measuring between the following circuits with a DMM.
* Phase U and phase V
* Phase U and phase W
锟斤拷If you measure 0.5 ohms or less, continue with Circuit/System Testing.
锟斤拷If you measure more than 0.5 ohms, proceed to Open Phase Testing Procedure below.
7. Test the resistance to ground for each phase of the applicable drive motor generator by measuring between the following points with a DMM.
* Phase U terminal and chassis ground
* Phase V terminal and chassis ground
* Phase W terminal and chassis ground
锟斤拷If infinite resistance is measured, replace the 3-phase cable assembly and the drive motor generator assembly that corresponds to the set
DTC and retest for the DTC. If the DTC resets replace the PIM.
锟斤拷If less than infinite is measured, continue with Circuit/System Testing.
8. Remove the 3-phase cable assembly from the transmission. Refer to Generator Control Module 3-Phase Cable Assembly Replacement ().
Ensure the terminals are not contacting chassis ground.
9. Retest the resistance to ground for each phase of the 3-phase cable. Measure between the following points with a DMM.
* Phase U terminal and shield ground
* Phase V terminal and shield ground
* Phase W terminal and shield ground
锟斤拷If infinite resistance is measured, replace the applicable drive motor generator.
锟斤拷If less than infinite is measured, replace the generator control module 3-phase cable assembly.
Open Phase Testing Procedure
1. Remove the 3 phase cable assembly cover from the transmission and inspect the 3 phase cable terminal fasteners for the proper torque and for
arc-flash damage. Refer to Generator Control Module 3-Phase Cable Assembly Replacement ().
锟斤拷If any fasteners were loose and no arc flash damage is present, torque the fasteners and re-assemble the vehicle. Retest for the DTC.
锟斤拷If any fasteners were loose and arc flash damage is present, replace the applicable drive motor generator assembly and the 3 phase cable
assembly.
2. Disconnect the 3 phase cable assembly from the transmission. Refer to Generator Control Module 3-Phase Cable Assembly Replacement ().
3. Test each cable for continuity from the PIM connection terminal to the transmission connection terminal.
锟斤拷If you measure greater than 0.5 ohms, replace the 3 phase cable assembly.
锟斤拷If you measure 0.5 ohms or less, replace the applicable drive motor generator assembly.
