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 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
Diagnostic Fault Information
Circuit/System Description
The ignition system on this engine uses an individual coil for each cylinder. The engine control module (ECM) controls the spark event for each cylinder through the individual ignition coil 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 cranking or running.
* Ignition voltage greater than 5 V.
The DTCs run continuously when the above condition are met.
Conditions for Setting the DTC
The engine control module detects that the voltage command state of the driver and the actual state of the control circuit do not match.
Action Taken When the DTC Sets
DTCs P0351, P0352, P0353, and P0354 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0351, P0352, P0353, and P0354 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (LHU) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left
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
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
EL 26792 - HEI Spark Tester
For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Diagnostic Tools).
Circuit/System Verification
1. Engine Running.
2. Verify the parameters listed below do not display Malfunction:
* Ignition Coil 1-4 Control Circuit High Voltage Test Status
* Ignition Coil 1-4 Control Circuit Low Voltage Test Status
* Ignition Coil 1-4 Control Circuit Open Test Status
• If Malfunction is displayed
Refer to Circuit/System Testing.
• If Malfunction is not displayed
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.
4. Verify the DTC does not set.
• If the DTCs sets
Refer to Circuit/System Testing.
• If the DTC does not set
5. All OK.
Circuit/System Testing
1. Engine Running.
2. Verify the appropriate scan tool Ignition Coil Control Circuit Low Voltage Test Status does not display Malfunction.
• If Malfunction is displayed
1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the control circuit.
• If infinite resistance, replace the K20 Engine Control Module.
• If Malfunction is not displayed
3. Verify the appropriate scan tool Ignition Coil Control Circuit High Voltage Test Status does not display Malfunction.
• If Malfunction is displayed
1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage in the circuit.
• If less than 1 V, replace the K20 Engine Control Module.
• If Malfunction is not displayed
4. Ignition OFF, install a 3 A fused jumper wire between the control circuit terminal C and ground, engine Running.
5. Verify the appropriate scan tool Ignition Coil Control Circuit Low Voltage Test Status displays Malfunction.
• If Malfunction is not displayed
1. Ignition OFF, remove the fused jumper, and disconnect the X3 harness connector at the K20 Engine Control Module.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.
• If Malfunction is displayed
6. Test or replace the T8 Ignition Coil.
Component Test
Note: You must perform the Circuit/System Testing before proceeding with Component Testing.
1. Ignition OFF, connect the EL 26792 - HEI Spark Tester to the appropriate T8 Ignition Coil.
2. Engine Running.
3. Verify the spark output of the T8 Ignition Coil.
• If no output or the output is weak
Replace the T8 Ignition Coil.
• If the output is normal
4. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Ignition Coil Replacement Service and Repair
* Control Module References Control Module References for engine control module replacement, programming, and setup