2010 Cadillac Truck SRX AWD V6-3.0L Page 1411
Circuit/System Verification
1. Engine at operating temperature, all accessories OFF, and engine speed greater than 2,000 RPM, observe the Knock Retard and Total Knock
Retard parameters. The parameters should be 0掳.
2. Engine idling, move the related harnesses and connectors for the KS circuits while observing the scan tool Knock Retard and Total Knock
Retard parameters. The parameters should remain steady with no abrupt changes.
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
Note:
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using these diagnostic procedures.
* If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. Refer to Symptoms - Engine
Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms -
Engine Mechanical).
P0324, P0326 and P0331
1. Using a scan tool, verify DTCs P0335 or P0336 are not set.
瀚慖f any of the DTCs are set, diagnose them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
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.
