Refer to
Cell 21: Ignition Controls
Circuit Description
The Ignition Control (IC) Module sends signals that the PCM requires for fuel control and spark advance calculations. At the start of engine crank, the IC Module controls spark advance. When the second 3X reference pulse is recognized by the PCM, the PCM applies 5.0 volts to the Bypass circuit, commanding the IC Module to switch spark advance to PCM control. If the PCM detects a short to voltage in the Bypass circuit, DTC P1362 will set. A short to ground in the IC circuit or Bypass circuit will cause both DTC P1362 and DTC P1362 to set. The engine will start and may run with IC Module controlling spark timing.
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. |
| • | The conditions is present for 300 3X reference periods (100 crankshaft revolutions). |
Action Taken When the DTC Sets
| • | The PCM will illuminate the 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 Fail Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn the MIL off 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 Clear Info function or by disconnecting the PCM battery feed. |
Diagnostic Aids
Check for the following conditions:
| • | Poor connection at the PCM. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. |
| Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Refer to Intermittents and Poor Connections Diagnosis and Repairing Connector Terminals in Wiring Systems. |
| • | Damaged harness. Refer to Wiring Repairs in Wiring Systems. |
| Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the IC Module, turn the ignition on and observe a digital multimeter connected between the IC circuit and battery positive voltage while moving connectors and wiring harnesses related to the IC Module. A change in voltage will indicate the location of the malfunction. Refer to Wiring Repairs in Wiring Systems. |
Reviewing the Fail 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 | Was the Powertrain OBD System Check performed? | -- | ||
2 | Is DTC P1361 set also? | -- | ||
3 |
Is the test lamp on? | -- | ||
4 |
Is the test lamp on? | -- | ||
5 | Locate and repair the short to voltage in the BYPASS 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 |
Was a problem found? | -- | ||
11 |
Does the resistance switch from below the first value to above the second value? | 500ohms 5000ohms | ||
12 | Replace the Ignition Control Module. Refer to Ignition Coil(s) Replacement . Is the action complete? | -- | -- | |
13 |
Important: Replacement PCM must be reprogrammed. 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 |
