Tech Tips
Inspect the 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.
Check and wiggle the harness(es), connector(s) and terminal(s).