Refer to
IC Module, CMP and CKP Sensors
in Engine Controls Schematics.
Circuit Description
The ignition control module (ICM) sends signals that the PCM requires for fuel control and spark advance calculations. At the start of engine crank, the ICM controls spark advance. This is called the bypass mode. When the second 3X reference pulse is recognized by the PCM, the PCM applies 5 volts to the bypass circuit. The 5 volts on the bypass circuit commands the ICM to switch spark advance to PCM control (IC mode). At this time, The ICM will remove the ground it has applied to the IC circuit. When the IC pulses are not grounded, the ICM can use the IC pulses to control spark advance. A short in the IC circuit or an open or short to ground in the bypass circuit will cause the PCM to monitor no IC pulses after the PCM has switched the bypass circuit ON. The PCM will set DTC P1361 under either of these conditions. The engine may be started but will run on bypass mode timing.
Condition for Running the DTC
The engine is running.
Conditions for Setting the DTC
The PCM does not monitor IC pulses while IC mode spark advance is commanded.
Action Taken When the DTC Sets
| • | The PCM illuminates the MIL during the second consecutive trip in which the diagnostic test runs and fails. |
| • | The PCM stores the conditions that were present when the DTC set as Freeze Frame and Fail Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic runs and passes. |
| • | The history DTC clears after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear Information function or by disconnecting the PCM battery feed. |
Diagnostic Aids
Check for the following conditions:
| • | A faulty connection at the PCM--Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Use a corresponding mating terminal to test for proper terminal tension. |
| • | A damaged harness--Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the ICM, turn the ignition ON and observe a DMM connected between the IC circuit and B+ while moving connectors and wiring harnesses related to the ICM. A change in voltage will indicate the location of the malfunction. |
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition occurs that caused the DTC to set. This may assist in diagnosing the condition.
Test Description
The numbers below refer to the step numbers on the Diagnostic Table:
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 | Is DTC P1362 set also? | -- | ||
3 |
Is the test lamp ON? | -- | ||
4 |
Is the test lamp ON? | -- | ||
5 | Locate and repair the short to voltage in the IC circuit. Refer to Wiring Repairs in Wiring Systems . Is the action complete? | -- | -- | |
6 |
Is the test lamp ON? | -- | ||
7 | Locate and repair the short to ground in the IC circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
8 |
Is the test lamp ON? | -- | ||
9 | Locate and repair the short to ground in the BYPASS circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
10 |
Did you find a problem? | -- | ||
11 |
Does the voltage toggle between the two indicated ranges? | 20-40 mV 150-250 mV | ||
12 | Replace the ignition control module. Refer to Ignition Control Module Replacement . Is the action complete? | -- | -- | |
|
Important: Replacement PCM must be reprogrammed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM.Is the action complete? | -- | -- | ||
14 |
Does the scan tool indicate DTC P1361 failed this ignition? | -- | System OK |
