• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Ignition Coil 1 Control Circuit | P0351 | P0351 | P0351 | -- |
Ignition Coil 2 Control Circuit | P0352 | P0352 | P0352 | -- |
Ignition Coil 3 Control Circuit | P0353 | P0353 | P0353 | -- |
Ignition Coil 4 Control Circuit | P0354 | P0354 | P0354 | -- |
Ignition Coil 5 Control Circuit | P0355 | P0355 | P0355 | -- |
Ignition Coil 6 Control Circuit | P0356 | P0356 | P0356 | -- |
Ignition Coil 7 Control Circuit | P0357 | P0357 | P0357 | -- |
Ignition Coil 8 Control Circuit | P0358 | P0358 | P0358 | -- |
The ignition system on this engine uses an individual module/coil for each cylinder. The engine control module (ECM) controls the spark event for each cylinder through the 8 individual ignition control (IC) circuits. When the ECM commands the IC 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 IC 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 IC circuit for improper voltage levels. Each ignition module/coil assembly has the following electrical circuits attached:
• | An ignition 1 voltage circuit |
• | A ground circuit |
• | An IC circuit |
• | A low reference circuit |
• | The engine is cranking or running. |
• | DTCs P0351-P0358 runs continuously when the above condition is met. |
The ECM detects one of the following failures on the IC circuit for up to 6 seconds:
• | An open |
• | A short to ground |
• | A short to voltage |
DTC P0351-P0358 are Type B DTCs.
DTC P0351-P0358 are Type B DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Important: A high resistance on any IC circuit can cause a misfire before the DTC sets.
• | Short to voltage |
• | Short to ground |
• | Open/high resistance |
⇒ | If a fault is found, repair the circuit as needed. |
⇒ | If the DTC or the misfire transfers with the suspect ignition/coil module, replace the ignition/coil . |
⇒ | If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the ECM. |
• | Control Module References for ECM replacement, setup, and programming |
Important: An ignition system misfire condition can cause the 3-way catalytic converter to overheat under certain driving conditions.
If the customer concern was a flashing MIL, perform the following procedure: