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Home >> Chevy Truck >> 2013 >> Silverado 3500 4WD V8-6.0L (CNG) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0351

P0351




DTC P0351-P0358

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0351

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Ignition Coil 1 Control Circuit

DTC P0352

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Ignition Coil 2 Control Circuit

DTC P0353

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Ignition Coil 3 Control Circuit

DTC P0354

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Ignition Coil 4 Control Circuit

DTC P0355

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Ignition Coil 5 Control Circuit

DTC P0356

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Ignition Coil 6 Control Circuit

DTC P0357

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Ignition Coil 7 Control Circuit

DTC P0358

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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 circuits. When the ECM commands the ignition control 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 ignition control 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 sensor, and the camshaft position sensor for sequencing and timing of the spark events.

Conditions for Running the DTC

* The engine is running.

* The ignition voltage is greater than 6 V.

* DTC P0351-P0358 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

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

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

Reference Information

Schematic Reference

Engine Controls Schematics (except L96) [1][2]Electrical DiagramsEngine Controls Schematics (L96) [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Electronic Ignition System Description Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Engine running, observe the following scan tool control circuit status parameters for the appropriate cylinder T8 ignition coil:

* Cyl 1-8 IC Ckt. Gnd Test Status

* Cyl 1-8 IC Ckt. Open Test Status

* Cyl 1-8 IC Ckt. Short Volts Test

Each parameter should display Not Run or OK.

2. Engine idling, observe the DTC information with a scan tool. DTC P0351, P0352, P0353, P0354, P0355, P0356, P0357, or P0358 should not set.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Engine running, observe the Cyl 1-8 IC Ckt. Gnd Test Status on the scan tool. Test Status should be OK or Not Run.

• If test status is Fault test for open or short to ground.

2. Engine running, observe the Cyl 1-8 IC Ckt. Open Test Status on the scan tool. Test Status should be OK or Not Run.

• If test status is Fault test for open circuit.

3. Engine running, observe the Cyl 1-8 IC Ckt. Short Volts Test Status on the scan tool. Test Status should be OK or Not Run.

• If test status is Fault test for short to voltage.

4. Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.

Note:
The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition circuit.

5. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground.

• If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition voltage circuit and replace as necessary.

6. Connect a test lamp between the each of the ground circuits terminal A, and terminal B, and B+. The test lamp should illuminate on each circuit.

• If the test lamp does not illuminate, test the suspected circuit for an open/high resistance.

7. If all circuits test normal, test or replace the T8 ignition coil.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Ignition Coil Replacement Service and Repair

* Control Module References Control Module References for ECM replacement, setup, and programming

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