2010 Cadillac CTS Sedan AWD V6-3.6L Page 834
* DTCs P06B6 and P06B7 indicate an internal ECM circuitry failure. Replace the K20 ECM if no external knock sensor circuit issues exist.
Component Testing
1. Connect the DMM between the B68 knock sensor signal circuit terminal A and the B68 knock sensor signal circuit terminal B on the sensor
side of the appropriate B68 knock sensor harness connector.
2. Set the DMM to the 400 mV AC hertz scale and wait for the DMM to stabilize at 0 Hz.
Note: DO NOT tap on plastic engine components.
3. Tap on the engine block with a non-metallic object near the B68 knock sensor while observing the signal indicated on the DMM.
4. The DMM should display a fluctuating frequency while tapping on the engine block.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Knock Sensor Replacement - Bank 1 (See: Powertrain Management/Computers and Control Systems/Knock Sensor/Service and
Repair/Knock Sensor Replacement - Bank 1)
* Knock Sensor Replacement - Bank 2 (See: Powertrain Management/Computers and Control Systems/Knock Sensor/Service and
Repair/Knock Sensor Replacement - Bank 2)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P06B7
DTC P0324-P0328, P0330-P0333, P06B6, or P06B7 (w/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 P0324
- Knock Sensor System Performance
DTC P0325
- Knock Sensor Circuit Bank 1
DTC P0326
- Knock Sensor Performance Bank 1
DTC P0327
- Knock Sensor Circuit Low Voltage Bank 1
DTC P0328
- Knock Sensor Circuit High Voltage Bank 1
DTC P0330
- Knock Sensor Circuit Bank 2
DTC P0331
- Knock Sensor Performance Bank 2
DTC P0332
- Knock Sensor Circuit Low Voltage Bank 2
DTC P0333
- Knock Sensor Circuit High Voltage Bank 2
DTC P06B6
- Control Module Knock Sensor Processor 1 Performance
