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 ignition coil module. 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 (CKP) sensor, and the camshaft position (CMP) sensor for sequencing and timing of the spark events. The ECM monitors each ignition control circuit for improper voltage levels. The ignition coil module has the following electrical circuits:
* An ignition voltage circuit
* A ground
* An IC control circuit for each cylinder coil
* A low reference circuit
Conditions for Running the DTC
* The engine is running.
* Ignition voltage is greater than 5 V.
The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
The engine control module detects that the voltage command state 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 [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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
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 DTC P0351-P0354 does not set.
• If any of the DTCs are set
Refer to Circuit/System Testing.
• If none of the DTCs are set
5. All OK.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K35 Ignition Coil Module. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 5 ohms between the ground circuit terminal B and ground.
• If 5 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 5 ohms
3. Test for less than 5 ohms between the low reference circuit terminal C and ground.
• If 5 ohms or greater
1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module.
2. Test for less than 2 ohms in the low reference 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 less than 5 ohms
4. Ignition ON.
5. Verify a test lamp illuminates between the ignition circuit terminal A and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF, remove the test lamp.
2. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
Note: The ignition circuit supplies voltage to other components. Make sure to test all circuits and components for a short to ground that share the ignition circuit.
1. Ignition OFF, remove the test lamp.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K35 Ignition Coil Module.
• If the test lamp illuminates
6. Disconnect the harness connectors at the Q17 Fuel Injectors.
Note: Set the DMM to the DC Hz scale utilizing the Min-Max function for this test.
7. Connect a DMM between the appropriate ignition control circuit listed below and ground:
* Ignition Coil 1 terminal D
* Ignition Coil 2 terminal E
* Ignition Coil 3 terminal F
* Ignition Coil 4 terminal G
8. Test for greater than 1.5 Hz during engine cranking.
• If less than 1.5 Hz
1. Ignition OFF, disconnect the X2 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 circuit.
• If infinite resistance
3. 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
4. Ignition ON.
5. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.
• If greater than 1.5 Hz
9. Replace the K35 Ignition Coil Module.
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