2010 Cadillac CTS Sedan AWD V6-3.6L Page 1317
sensor signal for a certain length of time under different engine speeds and loads during non-cylinder knock events. This sampling is used to
determine a range of acceptable normal engine noise.
Conditions for Running the DTC
P0326 and P0331
* DTC P0324 is not set.
* The engine coolant temperature (ECT) sensor is warmer than 60掳C (140掳F).
* The engine speed is greater than 2,200 RPM.
* The increase in engine speed is less than 500-2,300 RPM per second.
* The increase in engine load is less than a range of 50-100 kPa per second.
* DTCs P0326 and P0331 run continuously once the above conditions are met for approximately 20 s.
P0327, P0328, P0332, and P0333
* DTC P0324 is not set.
* The engine coolant temperature (ECT) sensor is warmer than 60掳C (140掳F).
* The increase in engine speed is less than a range of 500-2300 RPM per second.
* The increase in engine load is less than a range of 50-100 kPa per second.
* DTCs P0327, P0328, P0332, and P0332 run continuously once the above conditions are met for approximately 20 s.
Conditions for Setting the DTC
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)
