2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2009

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2009

P0326

DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333

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 (KS) Module Performance

DTC P0325

- Knock Sensor (KS) Circuit Bank 1

DTC P0326

- Knock Sensor (KS) Performance

DTC P0327

- Knock Sensor (KS) Circuit Low Voltage Bank 1

DTC P0328

- Knock Sensor (KS) Circuit High Voltage Bank 1

DTC P0330

- Knock Sensor (KS) Circuit Bank 2

DTC P0332

- Knock Sensor (KS) Circuit Low Voltage Bank 2

DTC P0333

- Knock Sensor (KS) Circuit High Voltage Bank 2

Diagnostic Fault Information

Circuit/System Description

The knock sensor (KS) 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 ECM monitors 2 separate KS, one on each side of the engine block. Each

KS produces an AC voltage that varies, depending on the vibration levels detected during engine operation. The ECM receives the KS signal

through 2 isolated signal circuits for each KS. The ECM adjusts the spark timing based on the amplitude and frequency of each KS signal. The

ECM learns a minimum noise level for each sensor at idle speeds, and uses calibrated noise level values for the rest of the RPM range. The ECM

should monitor a normal KS signal within the noise channel.

Conditions for Running the DTC

P0324

* DTC P0325, P0326, P0327, P0328, P0330, P0332, or P0333 are not set.

* The engine speed is at least 400 RPM.

* DTC P0324 runs continuously when the above conditions are met.

P0325 or P0330

* DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 are not set.

* The engine speed is at least 400 RPM.

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

* The engine run time is at least 2 s.

* The power take-off (PTO) is not active.