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 ignition coils. Each IC module consists of the following circuits:
| • | Ignition 1 voltage |
| • | Ground |
| • | 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.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
| • | During PCM power-up, the PCM detects an open condition in the IC circuit group for the #1, #4, #6, and #7 cylinders. |
| OR |
| • | The PCM detects a short to voltage condition in the IC circuit group for the #1, #4, #6, and #7 cylinders. |
| • | The condition is present 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. |
Diagnostic Aids
The Misfire Current Cyl # / Misfire History Cyl # displays on the scan tool provides information that may be useful in diagnosing DTC P1359. The Misfire Current Cyl # counter may normally display a small amount of activity, 0-10 counts. However, the display should not increment steadily. If the Misfire Current Cyl # increments steadily for a single cylinder within the IC circuit group, the condition is isolated to the IC circuit for the specific cylinder. However, if the Misfire Current Cyl # increments randomly within the IC circuit group, the condition may be due to poor connections at the PCM or a faulty PCM. Also, if the Misfire Current Cyl # increments steadily for a cylinder bank, DTC P1360 may set. DTC P1360 may result from one of the following conditions:
| • | A loss of power or ground at the module assembly for the cylinder bank |
| • | A faulty or disconnected module assembly connector for the cylinder bank |
| • | A faulty ignition control module |
If the condition is intermittent, refer to Intermittent Conditions .
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||||||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |||||||
2 | Does DTC P1360 also set? | -- | Go to Step 3 | Go to Step 5 | ||||||
3 | With the engine idling, observe the Misfire Current Cyl # display on the scan tool. Is the Misfire Current Cyl # incrementing for any even cylinders? | -- | Go to Step 6 | Go to Step 4 | ||||||
4 | Is the Misfire Current Cyl # incrementing for any odd cylinders? | -- | Go to Step 7 | Go to Step 15 | ||||||
5 | With the engine idling, observe the Misfire Current Cyl # display on the scan tool. Is the Current Cyl # incrementing for two cylinders? | -- | Go to Step 8 | Go to Step 11 | ||||||
6 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||
7 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||
8 | Are the incrementing cylinders even (cylinders 4 and 6)? | -- | Go to Step 9 | Go to Step 10 | ||||||
9 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||
10 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||
11 |
Does the frequency measure within the specified values? | 1-2 Hz | Go to Step 13 | Go to Step 12 | ||||||
12 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||
13 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||
14 | Replace the appropriate ignition module. Refer to Ignition Control Module Replacement - Bank 1 or Ignition Control Module Replacement - Bank 2 . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
15 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
16 |
Does the DTC run and pass? | -- | Go to Step 17 | Go to Step 2 | ||||||
17 | With a scan tool observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |||||||
