2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2022

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2022

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.

* DTCs P0325 and P0330 run continuously when the above conditions are met.

P0326

* DTC P0068, P0606, P1516, P2101, P2135, or P2176 are not set.

* The engine speed is at least 400 RPM.

* The MAP is at least 10 kPa.

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

P0327, P0328, P0332, and P0333

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

* The engine run time is at least 2 s.

* DTCs P0327, P0328, P0332, and P0333 run continuously when the above conditions are met.

Conditions for Setting the DTC

P0324

The ECM has detected an internal circuitry fault for 5 s.

P0325 and P0330

The KS signal circuits are open or shorted together for 5 s.

P0326

* The KS signal indicates an engine knock is present.

* The ECM has commanded the spark retard to a value, which is more than the calibrated value, for a specific engine load and speed.

* The above conditions exist for more than 5 s.

P0326

* The KS signal indicates an engine knock is present.

* The ECM has commanded the spark retard to a value, which is more than the calibrated value, for a specific engine load and speed.

* The above conditions exist for more than 5 s.

P0327, P0328, P0332, and P0333

* The KS signal circuits are shorted to voltage or ground.

* The above conditions exist for more than 5 s.

Action Taken When the DTC Sets

* DTCs P0324, P0325, P0326, P0327, P0328, P0330, P0332, and P0333 are Type B codes.

* The ignition timing is retarded to reduce the potential of engine damaging spark knock.

Conditions for Clearing the DTC