Circuit Description
The ignition control module (ICM) sends the signals that the PCM requires for fuel control and spark advance calculations. At the start of engine crank the ICM controls the spark advance. When the second 3X reference pulse is recognized by the powertrain control module (PCM), the PCM applies 5.0 volts to the bypass circuit. The voltage on the bypass circuit commands the ICM to switch the spark advance to PCM control. At this time, the ICM will remove the ground applied to the IC circuit. When the IC pulses are not grounded, the ICM can use the IC pulses to control the spark advance. A short in the IC circuit or an open or a short to ground in the bypass circuit will cause the PCM to set DTC P1361. The engine may be started but will run with the ICM controlling the spark timing.
Conditions for Running the DTC
| • | The engine speed is more than 600 RPM. |
| • | DTC P1351 is not set. |
Conditions for Setting the DTC
| • | The PCM does not monitor IC pulses while IC mode spark advance is commanded. |
| • | The condition is present for 300 3X reference periods (100 crankshaft revolutions). |
Action Taken When the DTC Sets
| • | The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed. |
| • | The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed. |
| • | The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool. |
Diagnostic Aids
Inspect for the following conditions:
| • | A poor connection at the PCM. Inspect the harness connectors for the following conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems: |
| - | Backed-out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed or damaged terminals |
| - | Poor terminal-to-wire connection |
| • | 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 digital multimeter (DMM) connected between the IC circuit and B+ voltage while moving the connectors and the wiring harnesses related to the ICM. A change in the voltage indicates the location of the fault. Refer to Wiring Repairs in Wiring Systems . |
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 |
Is DTC P1361 set? | -- | Go to Diagnostic Aids | |
3 |
Does the test lamp illuminate? | -- | ||
4 |
Is the resistance more than the specified value? | 5000 ohms | ||
5 |
Does the test lamp illuminate? | -- | ||
6 |
Was a problem found? | -- | ||
7 |
Was a problem found? | -- | ||
8 |
Does the test lamp illuminate? | -- | ||
9 |
Was a problem found? | -- | ||
10 | Locate and repair short to ground in the IC circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
11 | Locate and repair short to ground in the bypass circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
12 |
Was a problem found? | -- | ||
13 |
Important: : The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | |
14 | Replace the ignition control module. Is the action complete? | -- | -- | |
15 |
Does the scan tool indicate DTC P1361 failed? | -- | System OK |
