2010 Cadillac Truck SRX FWD V6-3.0L Page 1436
2. Verify the following conditions do not exist.
* A loose or broken vehicle accessory
* A loose or broken accessory bracket
* Excessive engine mechanical noise
瀚慖f any of the conditions exist, repair as necessary.
3. Replace the K20 ECM if no external knock sensor circuit issues exist.
P0325, P0327, P0328, P0330, P0332, and P0333
1. Ignition OFF, disconnect the affected B68 KS.
2. Verify the affected B68 KS is properly tightened, refer to Fastener Tightening Specifications (See: Powertrain Management/Specifications).
3. Ignition OFF, with appropriate length jumper wires, connect the B68A KS1 harness to the B68B KS2 sensor and the B68B KS2 harness to
the B68A KS1 sensor.
4. Monitor the DTCs using a scan tool. Operate the vehicle within the conditions for running the DTC. Verify the fault does not follow the
sensor in question.
瀚慖f the fault follows the sensor in question, replace the appropriate B68 KS.
5. Ignition OFF, remove the jumper wires from the previous step.
6. Ignition ON, measure for 1-4 V between each of the following circuits and ground on the K20 ECM side of the harness connector:
* The B68 KS signal circuit, terminal A or 1
* The B68 KS signal circuit, terminal B or 2
瀚慖f less than the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the
K20 ECM.
瀚慖f greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 ECM.
7. Test for intermittent or poor connections at the ECM, B68 KS, and in-line connectors where present.
8. If all circuits test normal, replace the K20 ECM.
P06B6 or P06B7
1. Using a scan tool, verify the following DTCs are not set: P0325, P0327, P0328, P0330, P0332, and P0333.
瀚慖f any of the DTCs are set, diagnose them first.
2. DTCs P06B6 and P06B7 indicate an internal ECM circuitry failure. Verify the external knock sensor circuits and connectors for proper
condition.
瀚慖f no external knock sensor circuit issues exist, replace the K20 ECM.
Repair Instructions
* 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
Repair Verification
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
P0333
DTC P0324-P0328, P0330-P0333, P06B6, or P06B7 (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.
