Circuit Description
There are two separate ignition module assemblies, one for each bank of cylinders. Each assembly contains an ignition control (IC) module and four coils. Each IC module consists of the following circuits:
| • | An ignition 1 voltage |
| • | A ground |
| • | An IC timing low reference |
| • | IC circuits for cylinders 1-8 |
Each ignition coil connects directly to its spark plug via a short boot. The IC circuits transmit timing pulses from the powertrain control module (PCM) to the IC modules, which triggers the coils to fire the plugs in the correct sequence. The PCM monitors each IC circuit for improper voltage levels.
If a short to ground occurs in one of the IC circuits, DTC P0351-P0358 sets.
Conditions for Running the DTC
The engine speed is more than 400 RPM.
Conditions for Setting the DTC
The PCM detects a short to ground on the IC circuit for less than 1 second.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views | |||
1 | Did you perform the Diagnostic System Check-Engine Controls? | Go to Step 2 | |
2 |
Does the scan tool Misfire Counters increment for the affected cylinder? | Go to Step 3 | Go to Intermittent Conditions |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 |
4 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 9 |
5 | Test for an intermittent and for a poor connection at the IC module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
6 | Test for an intermittent and for a poor connection a the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
7 | Repair the short to ground in the affected IC control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 10 | -- |
8 | Replace the IC module. Refer to Ignition Coil Replacement - Bank 1 or Ignition Coil Replacement - Bank 2 . Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | Go to Step 10 | -- |
10 |
Did the DTC fail this ignition? | Go to Step 2 | Go to Step 11 |
11 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | System OK | |
