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.
Clear the DTCs (Click here).
Switch the ECM from normal mode to check mode using the GTS (Click here).
Perform a simulation test (Click hereClick hereClick hereClick hereClick hereClick here).
Check and wiggle the harness(es), connector(s) and terminal(s) (Click here).