Refer to Engine Controls Schematic
Crankshaft and Camshaft Position Sensors
.
Circuit Description
The ignition control module (ICM) sends signals that the powertrain control module (PCM) requires for fuel control and spark advance calculations. At the start of engine crank, the ICM controls spark advance, referred to as Bypass Mode. When the second 3X reference pulse is recognized by the PCM, the PCM applies 5 volts to the Bypass circuit, commanding the ICM to switch spark advance to PCM control, referred to as IC Mode. If the PCM detects a short to voltage in the Bypass circuit, the engine will start and may run in Bypass Mode timing. DTC P1362 will set.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The PCM detects a short to voltage in the Bypass circuit.
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/Failure Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has 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 a scan tool. |
Diagnostic Aids
Inspect for the following conditions:
| • | Poor connection at the PCM -- Inspect harness connectors for: |
| - | Backed out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed or damaged terminals |
| - | Poor terminal to wire connection |
| • | Damaged harness -- Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the ICM, turn ON the ignition 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. |
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 P1361 also set? | -- | ||
3 |
Does the test lamp illuminate? | -- | ||
4 |
Does the test lamp illuminate? | -- | ||
5 | Locate and repair the short to voltage in the BYPASS circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
6 |
Does the test lamp illuminate? | -- | ||
7 | Locate and repair the short to ground in the IC circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
8 |
Does the test lamp illuminate? | -- | ||
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 and correct the condition? | -- | ||
11 |
Does the voltage toggle between the specified ranges? | 20mV-40 mV 150-250 mV | ||
12 | Replace the ignition control module. Refer to Ignition Control Module Replacement . Is the action complete? | -- | -- | |
|
Important:: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | ||
14 |
Does the scan tool indicate DTC P1362 failed this ignition? | -- | System OK |
