Check for Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

HINT: Intelligent tester only:
Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with an intelligent tester when the ECM is in check mode. In check mode, the ECM uses 1trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2trip detection logic.

1. Clear DTCs.
2. Switch the ECM from normal mode to check mode using an intelligent tester.
3. Perform a simulation test.
4. Check and wiggle the harness(es), connector(s) and terminal(s).