Tech Tips
Inspect the vehicle ECM using check mode. Intermittent problems are easier to detect with the intelligent tester 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 tester Click here.
Perform a simulation test.
Check and wiggle the harness(es), connector(s) and terminal(s).