Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the intelligent tester or Techstream 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.

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