For 1990-2009 cars

### Circuit Description

The ignition control (IC) module has independent power and ground circuits. The circuits between the IC module and the powertrain control module (PCM) consist of the following circuits:

• | The IC timing signal

• | The IC timing control

• | The low-resolution engine speed signal

• | A low reference

The IC module sends 3 X signals to the PCM. The IC module controls the timing advance during engine cranking. The timing advance changes to PCM control after the following actions:

• | The PCM receives the second 3 X signal.

• | The PCM applies 5 volts to the IC timing signal circuit.

• | The timing advance switches to PCM control.

### Conditions for Running the DTC

• | The engine speed is more than 600 RPM.

• | DTC P1351 has not set.

### Conditions for Setting the DTC

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

• | The condition is present for 300 3 X reference periods, 100 crankshaft revolutions.

### Action Taken When the DTC Sets

• | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.

• | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

### Conditions for Clearing the MIL/DTC

• | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

• | A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

• | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

• | Clear the MIL and the DTC with a scan tool.

### Test Description

The number below refers to the step number on the diagnostic table.

1. This step determines if DTC P1362 is also set.

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Engine Controls Schematics
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Controls
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, monitor the DTC information for DTC P1362 in the PCM.

Does the scan tool indicate that DTC P1362 is current?

--

Go to Step 6

Go to Step 3

3 |

1. Observe the Freeze Frame/Failure Records for this DTC.
2. Turn the ignition OFF for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions for Running the DTC, or within the parameters that are observed in the Freeze Frame/Failure Records.

Does the DTC fail this ignition?

--

Go to Step 4

Go to Intermittent Conditions

4 |

1. Turn OFF the ignition.
2. Disconnect the PCM.
3. Turn ON the ignition.
4. Probe the IC timing control circuit with a test lamp that is connected to ground.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 14

5 |

1. Turn OFF the ignition.
2. Do NOT reconnect the PCM.
3. Disconnect the IC module connector.
4. Turn ON the ignition.
5. Probe the IC timing control circuit with a test lamp that is connected to ground.

Does the test lamp illuminate?

--

Go to Step 10

Go to Step 13

6 |

1. Turn OFF the ignition.
2. Disconnect the IC module.
3. Probe the IC timing control circuit at the PCM with a test lamp that is connected to battery positive voltage.

Does the test lamp illuminate?

--

Go to Step 11

Go to Step 7

7 |

1. Leave the ignition OFF.
2. Do NOT reconnect the IC module.
3. Probe the IC timing signal circuit with a test lamp that is connected to a battery positive voltage.

Does the test lamp illuminate?

--

Go to Step 12

Go to Step 8

8 |

1. Leave the ignition OFF.
2. Do NOT reconnect the PCM.
3. Do NOT reconnect the IC module.
4. Test for a short between the IC timing control and the IC timing signal circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 9

9 |

1. Leave the ignition OFF.
2. Reconnect the IC module.
3. Do NOT reconnect the PCM.
4. Turn ON the ignition.
5. Using the DMM, observe the resistance between the IC timing control circuit and a known good ground while probing the IC timing signal circuit with a test lamp. Connect the test lamp to a battery positive voltage.

Does the resistance toggle between the 2 indicated ranges?

100-600 ohms to 6,000-10,000 ohms

Go to Step 14

Go to Step 13

10 | Repair the short to voltage in the IC timing control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 15 | --
11 | Repair the short to ground or the low reference in the IC timing control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 15 | --
12 | Repair the short to ground or the low reference in the IC timing signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 15 | --
13 | Replace the IC module. Refer to Ignition Control Module Replacement . Did you complete the replacement? | -- | Go to Step 15 | --
14 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | -- | Go to Step 15 | --
15 |

1. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions for Running in the DTC as specified in the supporting text.

Does the DTC run and pass?

--

Go to Step 16

Go to Step 3

16 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List | System OK