2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2896
瀚慖f the voltage is not within the specified value, or the charge indicator light is ON, refer to Symptoms - Engine Electrical (See: Starting
and Charging/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Electrical).
2. Observe the scan tool TCM Ignition Voltage parameter. The reading should be between 12.5-14.5 volts.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the X1 16-way harness connector at the T12 automatic transmission assembly.
2. Ignition OFF, test for less than 5 ohms on the vehicle harness connector X1 terminal 5 and ground at the transmission case.
瀚慖f greater than then specified valve, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates at connector X1 vehicle harness side and the following terminals:
* Terminal 4 and ground at the transmission case
* Terminal 12 and ground at the transmission case
瀚慖f the test lamp does not illuminate on any circuit, test the ignition or B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the Q8 control solenoid valve assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Perform the Service Fast Learn Adapts (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and
Inspection/Programming and Relearning) following all transmission related repairs.
Hybrid Controls
DTC P2534
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 Descriptor
DTC P2534
- Ignition 1 Switch Circuit Low Voltage
Circuit/System Description
The hybrid powertrain control module (HPCM) uses ignition 1 circuit terminal voltage to monitor the 12V system voltage. Ignition 1 circuit voltage
also powers several of the internal drive motor generator power inverter control module (PIM) components.
Conditions for Running the DTC
Ignition is ON.
Conditions for Setting the DTC
The control module has detected ignition 1 circuit voltage is 2V or less.
Action Taken When the DTC Sets
* DTC P2534 is a Type A DTC.
* The HPCM commands the engine OFF.
Conditions for Clearing the DTC
