2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2037

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2037

* 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 P0351

- Ignition Coil 1 Control Circuit

DTC P0352

- Ignition Coil 2 Control Circuit

DTC P0353

- Ignition Coil 3 Control Circuit

DTC P0354

- Ignition Coil 4 Control Circuit

DTC P0355

- Ignition Coil 5 Control Circuit

DTC P0356

- Ignition Coil 6 Control Circuit

DTC P0357

- Ignition Coil 7 Control Circuit

DTC P0358

- Ignition Coil 8 Control Circuit

Diagnostic Fault Information

Circuit/System Description

The ignition system on this engine uses an individual coil/module for each cylinder. The engine control module (ECM) controls the spark event for

each cylinder through the eight individual ignition control (IC) circuits. When the ECM commands the IC circuit ON, electrical current will flow

through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM will command the IC circuit

OFF, interrupting current flow through the primary winding. The magnetic field created by the primary winding will collapse across the secondary

coil windings, producing a high voltage across the spark plug electrodes. The ECM uses information from the crankshaft position (CKP) sensor,

and the camshaft position (CMP) sensor for sequencing and timing of the spark events. Each ignition coil/module assembly has the following

circuits:

* Ignition voltage

* Ground

* Ignition control (IC)

* Low reference

If the ECM detects that the IC circuit has an incorrect voltage level, DTC P0351-P0358 will set.

Conditions for Running the DTC

* The ignition is ON.

* DTC P0351-P0358 runs continuously when the above condition is met.