ECD SYSTEM CHECK FOR INTERMITTENT PROBLEMS

Tech Tips

Intelligent tester:

Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the ECM is in check mode with the intelligent 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.


  1. Clear the DTCs Click here.

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

  3. Perform a simulation test Click here.

  4. Check the connector and terminal Click here.

  5. Wiggle the harness and the connector Click here.