Check For Intermittent Problems

HINT:

Inspect the vehicle ECM using check mode. Intermittent problems are easier to detect with the 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 DTCs (See DTC CHECK/CLEAR  ).
2. Switch the ECM from normal mode to check mode using the Techstream (See CHECK MODE PROCEDURE  )
3. Perform a simulation test
4. Check and wiggle the harness(es), connector(s) and terminal(s).