For 1990-2009 cars
Engine Controls Components
Engine Controls Schematics
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

### 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 (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 IC Module to switch spark advance to PCM control (IC mode). At this time, the IC Module will remove the ground it has applied to the IC circuit. When the IC pulses are not grounded, the IC Module 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.

### Conditions for Setting the DTC

• | The PCM does not monitor IC pulses while IC mode spark advance is commanded.

• | Engine speed greater than 600 rpm.

• | No DTC P1350 set.

### 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

Check for the following conditions:

• | Poor connection at PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.

• | 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 voltmeter connected between the IC circuit and battery positive voltage while moving connectors and wiring harnesses related to the ICM. A change in voltage will indicate the location of the fault.

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.

#### DTC P1361 - IC Circuit Not Toggling

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain ON Board Diagnostic System Check performed? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check
2 |

1. Start engine and let idle for 2 minutes.
2. Observe DTCs.

Did DTC P1361 set?

--

Go to Step 3

Go to Diagnostic Aids

3 |

1. Turn the ignition OFF.
2. Disconnect the PCM.
3. Install a test lamp between battery positive voltage and the bypass circuit at the PCM harness connector.

Is the test lamp ON ?

--

Go to Step 8

Go to Step 4

4 |

1. Turn the ignition ON.
2. With the test lamp installed between battery positive voltage and the bypass circuit, measure the resistance between the IC circuit and the reference low circuit using a DMM.

Is resistance greater than the specified value?

6K ohms (6000 ohms)

Go to Step 12

Go to Step 5

5 |

1. Turn the ignition OFF.
2. Probe the IC circuit with a test lamp to battery positive voltage.

Is the test lamp ON?

--

Go to Step 10

Go to Step 6

6 |

1. Check the bypass circuit for an open.
2. If a problem is found, repair as necessary. Refer to Wiring Repairs .

Was a problem found?

--

Go to Step 15

Go to Step 7

7 |

1. Check the bypass circuit for a poor terminal connection at the ignition control module.
2. If a problem is found, replace faulty terminal. Refer to Wiring Repairs .

Was a problem found?

--

Go to Step 15

Go to Step 14

8 |

1. Turn the ignition OFF, disconnect the ignition control module.
2. Turn the ignition ON, observe test lamp connected between the bypass circuit and battery positive voltage.

Is the test lamp ON?

--

Go to Step 11

Go to Step 14

9 |

1. Turn the ignition OFF, disconnect the Ignition Control Module.
2. Turn the ignition ON, check the IC circuit for a short to voltage.
3. If a problem is found, repair as necessary. Refer to Wiring Repairs .

Was a problem found?

--

Go to Step 15

Go to Step 13

10 | Locate and repair short to ground in the IC circuit. Refer to Wiring Repairs . Is the action complete? | -- | Go to Step 15 | --
11 | Locate and repair short to ground in the bypass circuit. Refer to Wiring Repairs . Is the action complete? | -- | Go to Step 15 | --
12 |

1. Check the Bypass circuit for a poor terminal connection at the PCM.
2. If a problem is found, repair as necessary. Refer to Wiring Repairs .

Was a problem found?

--

Go to Step 15

Go to Step 13

13 | Important: Replacement PCM must be reprogrammed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Is the action complete? | -- | Go to Step 15 | --
14 | Replace the ignition control module. Refer to Ignition Control Module Replacement . Is the action complete? | -- | Go to Step 15 | --
15 |

1. Review and record scan tool Fail Records data.
2. Clear DTCs.
3. Operate vehicle within Fail Records conditions as noted.
4. Using a scan tool, monitor Specific DTC info for DTC P1361.

Does scan tool indicate DTC P1361 failed?

--

Go to Step 2

System OK