Wednesday, January 15, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1315

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1315



P0326 and P0331



The ECM detects a short to ground or a voltage on the knock sensor signal circuits in 25 of 250 test samples. The condition exists for greater than 1



s or for a cumulative of 10 s.



P0327 or P0332



The ECM detects the knock sensor signal voltage is less than the calculated minimum for a predetermined engine noise level. The condition exists



during 2 consecutive tests, for greater 1 s or a cumulative of 10 s.



P0328 or P0333



The ECM detects the knock sensor signal voltage is greater than the calculated maximum for a predetermined engine noise level. The condition



exists during 2 consecutive tests, for greater 1 s or a cumulative of 10 s.



Action Taken When the DTC Sets



DTCs P0326, P0327, P0328, P0331, P0332, and P0333 are Type B DTCs.



Conditions for Clearing the DTC



DTCs P0326, P0327, P0328, P0331, P0332, and P0333 are Type B DTCs.



Diagnostic Aids



* Inspect the knock sensor for physical damage. A knock sensor that is dropped or damaged may cause a DTC to set.



* Inspect the knock sensor for proper installation. A knock sensor that is loose or over torqued may cause a DTC to set. The knock sensor



should be free of thread sealant. The knock sensor mounting surface should be free of burrs, casting flash, and foreign material.



* The knock sensor must be clear of hoses, brackets, and engine electrical wiring.



* The normal voltage on the knock sensor signal and low reference circuits is 2.43 V when the knock sensor is disconnected.



Reference Information



Schematic Reference



Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics



(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



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. Engine speed greater than 2,000 RPM, observe the appropriate scan tool knock sensor



signal voltage parameter. The voltage should be greater than 4 V.



2. Engine idling, move the related harnesses and connectors for the knock sensor circuits while observing the scan tool knock sensor signal



voltage parameters. The voltage 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



1. Ignition OFF, disconnect the harness connector at the appropriate B68 knock sensor.



Note: If the voltage is not within the specified range on either circuit, test for a wire to wire short, to ground or voltage between the knock

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