2010 Cadillac Truck SRX FWD V6-3.0L Page 952

2010 Cadillac Truck SRX FWD V6-3.0L Page 952

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0324

- Knock Sensor System Performance

DTC P0325

- Knock Sensor Circuit Bank 1

DTC P0326

- Knock Sensor Performance Bank 1

DTC P0327

- Knock Sensor Circuit Low Voltage Bank 1

DTC P0328

- Knock Sensor Circuit High Voltage Bank 1

DTC P0330

- Knock Sensor Circuit Bank 2

DTC P0331

- Knock Sensor Performance Bank 2

DTC P0332

- Knock Sensor Circuit Low Voltage Bank 2

DTC P0333

- Knock Sensor Circuit High Voltage Bank 2

DTC P06B6

- Control Module Knock Sensor Processor 1 Performance

DTC P06B7

- Control Module Knock Sensor Processor 2 Performance

Diagnostic Fault Information

Circuit/System Description

The knock sensor system enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting

the engine from potentially damaging levels of detonation. The knock sensor produces an AC voltage signal that varies depending on the vibration

level during engine operation. The ECM adjusts the spark timing based on the amplitude and the frequency of the knock sensor signal. The ECM

receives the knock sensor signal through 2 isolated signal circuits for each bank. The ECM learns a minimum knock sensor noise level for all of the

RPM range. The ECM monitors for a normal knock sensor signal. The ECM monitors the internal knock sensor processor by verifying a 20 KHz

signal generated on the output circuit is detected on the return circuit.

Conditions for Running the DTC

P0324, P0326 and P0331-Excessive Knock Detection Mode

* Engine speed is between 400-8,500 RPM.

* The engine coolant temperature (ECT) is warmer than -40掳C (-40掳F).

* The intake air temperature (IAT) is warmer than -40掳C (-40掳F).

* The DTCs run continuously when the above conditions are met.

P0324, P0326 and P0331-Abnormal Noise Detection Mode-Improperly Bolted Knock Sensor