For 1990-2009 cars only
Circuit Description
If the engine control module (ECM) detects an overrun condition, then fuel injection stops.
Conditions for Setting the DTC
| • | 400 RPM or higher |
| • | Fuel injection stop |
| • | Fuel pressure feed stop |
Action Taken When the DTC Sets
The ECM will illuminate the malfunction indicator lamp (MIL) the first time the fault is detected.
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. |
DTC 0543 can be cleared by using the Clear Info option on the Tech 2 or by using the Diag Clear Switch.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Controls Schematics | |||
1 | Does DTC 0543 set with the ignition ON or with the engine operating? | Go to Step 2 | -- |
2 | Ask the driver if overrun is caused by gear slip-out, shift error, etc. Did you complete the action? | Misuse by Owner/Operator | -- |
