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P0351




DTC P0351-P0354

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 provide 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

Diagnostic Fault Information






Circuit/System Description

The ignition system uses individual ignition coil/module assemblies for each cylinder. The engine control module (ECM) controls the individual coils by transmitting timing pulses on the ignition control (IC) circuit of each ignition coil/module to enable a spark event. The ECM monitors each IC circuit for improper voltage levels.

Conditions for Running the DTC

* The engine is running.

* The ignition voltage is greater than 6 V.

* DTCs P0351-P0354 runs continuously when the above condition is met.

Conditions for Setting the DTC

The ECM detects an open, short to ground, or a short to voltage on the IC circuit or the ignition coil/module for less than 1 s.

Action Taken When the DTC Sets

DTCs P0351-P0354 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0351-P0354 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left Front

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

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Programming and Relearning 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:

* Ignition Coil 1-4 Control Circuit Low Voltage Test Status

* Ignition Coil 1-4 Control Circuit Open Test Status

* Ignition Coil 1-4 Control Circuit High Voltage Test Status

Each parameter should display Not Run or OK.

2. Engine idling, observe the DTC information with a scan tool. DTC P0351, P0352, P0353, or P0354 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. Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.

2. Ignition OFF, all vehicle systems OFF, it may take up to 2 minutes for all the systems to power down. Test for less than 5 ohms between the ground circuit terminal 1 and ground.

• If greater than the specified range, repair the ground circuit for an open/high resistance.

3. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal 2 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

4. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 4 and ground.

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

5. Engine idling at operating temperature, test for 0.200-0.300 V between the appropriate ignition control circuit terminal 3 and ground.

• If less than the specified range, test the ignition control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

• If greater than the specified range, test the ignition control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

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

Repair Instructions

* Ignition Coil Replacement Service and Repair

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

Repair Verification

Note:
An ignition control 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. Clear the DTCs.

4. Turn the ignition OFF for 60 s.

5. If the repair is related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.

6. 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.

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