Note on Intermittents

If an intermittent Code B334 is being set, manipulate the related wiring at ECM. With the ignition key on (engine not running), an ELECTRICAL PROBLEM warning light will indicate loss of ECM communication, and possibly help to isolate the intermittent without having to look for the code. Also check ECM and CALPAK connections.

Fig 1: Code B334: Circuit Diagram

Fig 2: Code B334: Flow Chart Loss of ECM Data