2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2057

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2057

瀚慐ach parameter should display OK.

2. With the engine running, observe the Misfire Current counters with a scan tool.

瀚慣he counters should not be incrementing.

3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed

from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. With the engine running, monitor the Cylinder 1-8 IC Circuit Status parameters with a scan tool.

瀚慖f a short to GND or Open status test displays FAULT, test for an open/high resistance or short to ground on the affected IC circuit

terminal C.

瀚慖f a short to volts status test displays FAULT, test for a short to voltage on the affected IC circuit terminal C.

Important: A high resistance on any IC circuit can cause a misfire condition before DTCs P0351-P0358 set.

2. Exchange the affected ignition coil/module with the ignition coil/module of a cylinder that is not affected.

3. Start and run the engine. With a scan tool, monitor the IC circuit parameters and the Misfire Current counters.

瀚慖f the circuit status fault identified or the misfire transfers with the ignition coil/module, replace the ignition coil/module assembly.

瀚慖f the circuit status fault identified or the misfire does not transfer with the ignition coil/module, replace the ECM.

Repair Instructions

* Ignition Coil Replacement (See: Powertrain Management/Ignition System/Ignition Coil/Service and Repair)

* Engine Control Module Replacement (See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and

Repair)

* Engine Control Module Programming and Setup (See: Powertrain Management/Computers and Control Systems/Engine Control

Module/Testing and Inspection)

Repair Verification

Important: An IC circuit fault condition will result in an engine misfire, and under certain driving conditions could possibly overheat the

3-way catalytic converter.

1. Install any components or connectors that have been removed or replaced during diagnosis.

2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.

3. Start and run the engine. With a scan tool, monitor the IC circuit status parameters. All IC circuit status parameters should display OK.

瀚慖f another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic.

4. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair

Verification for DTC P0420 or P0430. Refer to DTC P0420 or P0430 (See: P Code Charts/P0420).

P0420

DTC P0420 or P0430

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 P0420

- Catalyst System Low Efficiency Bank 1

DTC P0430

- Catalyst System Low Efficiency Bank 2