2010 Cadillac Truck SRX FWD V6-3.0L Page 1185
With the ignition ON, observe the following scan tool parameters for each cylinder:
* Ignition Coil Supply Voltage Bank 1
* Ignition Coil Supply Voltage Bank 2
瀚慐ach parameter should display ON.
Circuit/System Testing
Note: The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for
being shorted that share the ignition circuit.
1. Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground of each T8 ignition coil.
瀚慖f the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance.
瀚慖f the circuit tests normal, with the ignition OFF, disconnect the harness connector at each T8 ignition coil and monitor the fuse while
individually connecting each T8 ignition coil. If the fuse opens, replace the appropriate T8 ignition coil.
3. Ignition OFF, disconnect the K20 ECM harness connector X1.
4. Ignition ON, connect a test lamp between the following ignition voltage circuits and ground:
* X1 67
* X1 62
The test lamp should illuminate on each circuit.
瀚慖f the test lamp does not illuminate, test the ignition circuit for an open/high resistance.
5. If all circuits/connections test normal, replace the K20 ECM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* T8 Ignition Coil Replacement - Bank 1 (See: Powertrain Management/Ignition System/Ignition Coil/Service and Repair/Ignition Coil
Replacement - Bank 1)
* T8 Ignition Coil Replacement - Bank 2 (See: Powertrain Management/Ignition System/Ignition Coil/Service and Repair/Ignition Coil
Replacement - Bank 2)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for K20 ECM replacement, setup, and
programming
P135B
DTC P135A or P135B (LF1)
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 P135A
- Ignition Coil Supply Voltage Circuit Bank 1
DTC P135B
- Ignition Coil Supply Voltage Circuit Bank 2
Diagnostic Fault Information
