ECD SYSTEM CHECK FOR INTERMITTENT PROBLEMS

Tech Tips

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 1-trip detection logic, which is more sensitive to malfunctions than normal mode (default). Normal mode uses 2-trip detection logic.


  1. Clear the DTC(s) Click here.

  2. Switch the ECM from normal mode to check mode using the intelligent tester Click here.

  3. Perform a simulation test Click here.

  4. Check and wiggle the harness(es), connector(s) and terminal(s) Click here.