2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1267

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1267

P0327, P0328, P0332, and P0333

* DTCs P0324, P0335, P0336, P0338, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, P0393 are not set.

* The engine speed is greater than 1,960 RPM.

* The ECM is controlling spark.

* The increase in engine speed is less than a range of 1,400-3,700 RPM per second.

* The engine load is in the range of 35-65 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 knock sensor signal voltage that is not in the range of a predetermined engine noise level 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 a knock sensor signal voltage that is less than the predetermined minimum engine noise level for greater than 1 s or for a

cumulative of 10 s.

P0328 or P0333

The ECM detects the knock sensor signal voltage is greater than predetermined maximum engine noise level for greater than 1 s or for 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.

* With the knock sensor disconnected, the normal voltage measured from the knock sensor signal or the low reference circuit to ground is

between 2.30-2.80 V.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (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/Connector End Views By Name)

Description and Operation

Knock Sensor System Description (See: Powertrain Management/Computers and Control Systems/Knock Sensor/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/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)