Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

Hand-held tester only:
Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the ECM is in check mode with hand-held tester. In check mode, the ECM uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic.

a. Clear the DTCs. (See step 2)
b. Set the check mode. (See step 3)
c. Perform a simulation test
d. Check the connector and terminal
e. Wiggle the harness and connector