Check For Intermittent Problems

HINT:

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

1. Clear the DTCs (See DTC CHECK/CLEAR  ).
2. Switch the hand-held tester from normal mode to check mode (See CHECK MODE PROCEDURE  ).
3. Perform a simulation test (See HOW TO PROCEED WITH TROUBLESHOOTING ).
4. Check the connector(s) and terminal(s) (See HOW TO PROCEED WITH TROUBLESHOOTING ).
5. Wiggle the harness and connector(s) (See HOW TO PROCEED WITH TROUBLESHOOTING ).