Check For Intermittent Problems

HINT:

Techstream only:

Inspect the vehicle's 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 1trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2trip 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).