2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2040

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2040

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.

Conditions for Setting the DTC

The ECM detects one of the following failures on the IC circuit:

* An open

* A short to ground

* A short to voltage

Action Taken When the DTC Sets

DTCs P0351-P0358 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0351-P0358 are Type B DTCs.

Diagnostic Aids

* This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:

Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).

* A high resistance condition on any IC circuit can cause an engine misfire without setting DTC P0351-P0358.

Reference Information

Schematic Reference

Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference