2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1261

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1261

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Note: If you can hear an engine knock, repair the engine mechanical condition before proceeding with this diagnostic. Refer to Symptoms - Engine

Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine

Mechanical).

1. Ignition ON, observe the DTC information with a scan tool. DTC P0335, P0336, or P0338 should not be set.

瀚慖f DTC P0335, P0336, or P0338 is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for diagnosis of DTC P0335, P0336, or P0338.

2. Clear the DTCs with a scan tool.

3. Turn OFF the ignition for 30 s.

4. 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.

瀚慖f DTC P0324 failed this ignition, replace the K20 ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P0326

DTC P0326, P0327, P0328, P0331, P0332, or P0333 (LAU)

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 P0326

- Knock Sensor System Performance Bank 1

DTC P0327

- Knock Sensor Circuit Low Voltage Bank 1

DTC P0328

- Knock Sensor Circuit High Voltage Bank 1

DTC P0331

- Knock Sensor System Performance Bank 2

DTC P0332

- Knock Sensor Circuit Low Voltage Bank 2

DTC P0333

- Knock Sensor Circuit High Voltage Bank 2

Circuit/System Description

The knock sensor is a piezoelectric device that produces an AC voltage of different amplitude and frequency depending on the level of engine

mechanical vibration. The knock sensor system monitors the knock sensor in order to determine if detonation or spark knock is present. If the

knock sensor system determines that excessive knock is present, the engine control module (ECM) retards the spark timing based on the signal

from the knock sensor system. The knock sensor produces an AC signal when specific frequencies are detected. The ECM then retards the timing