2010 Cadillac CTS Sedan AWD V6-3.6L Page 1313
Ignition System Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
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
P0324, P0326 and P0331
* If DTCs P0335 or P0336 are also set, diagnose those DTCs first.
* Inspect for a loose or broken vehicle accessory or accessory bracket.
* Inspect for excessive engine mechanical noise.
P0325, P0327, P0328, P0330, P0332, P0333
1. Ignition ON, engine OFF.
2. Disconnect the appropriate B68 knock sensor harness connector.
3. Test for 1-4 V between each of the following circuits and ground on the K20 ECM side of the harness connector:
* The B68 knock sensor signal circuit, terminal A
* The B68 knock sensor signal circuit, terminal B
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.
4. If the circuits test normal, replace the appropriate B68 knock sensor.
P06B6 and P06B7
* Verify that the following DTCs are not set: DTC P0325, P0327, P0328, P0330, P0332 and P0333.
瀚慖f any of the DTCs are set, diagnose them first.
* 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
