SFI SYSTEM CHECK FOR INTERMITTENT PROBLEMS

Tip:

Inspect the vehicle ECM using check mode. Intermittent problems are easier to detect with the GTS when the ECM is in check mode. In check mode, the ECM uses 1-trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2-trip detection logic.

1. Clear the DTCs (Click here).

2. Switch the ECM from normal mode to check mode using the GTS (Click here).

3. Perform a simulation test.

4. Check and wiggle the harness(es), connector(s) and terminal(s).