Circuit Description
The ignition control (IC) module sends signals that the powertrain control module (PCM) requires for fuel control and spark advance calculations. At the start of engine crank, the IC module controls spark advance, called bypass mode. When the second 3X reference pulse is recognized by the PCM, the PCM applies 5 volts to the IC Signal circuit, commanding the IC module to switch spark advance to PCM control (IC mode).
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
| • | The PCM detects an open circuit in the IC Signal circuit. |
| • | The condition is present for 300 3X reference periods, 106 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/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
The engine will start and may run in bypass mode timing.
If the condition is intermittent, refer to Intermittent Conditions .
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |
2 |
Does the DTC fail this ignition? | -- | Go to Step 3 | Go to Intermittent Conditions |
3 |
Does the test lamp illuminate? | -- | Go to Step 6 | Go to Step 4 |
4 | Check Low Reference circuit for open. Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 5 |
5 | Check for poor connections at IC module. Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 7 |
6 |
Does the resistance measure greater than the specified value? | 5,000 ohms | Go to Step 8 | Go to Step 7 |
7 |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 |
8 | Inspect for poor terminal connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 |
9 | Inspect for poor terminal connections at the IC module. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 10 |
10 | Replace the ignition control (IC) module. Refer to Ignition Control Module Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- |
11 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- |
12 |
Does the scan tool indicate DTC 1352 failed this ignition? | -- | Go to Step 2 | Go to Step 13 |
13 | With a scan tool, observe the stored information in Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |
