CHECK HARNESS OF COMMUNICATION LINE.

Measure voltage between the ECM harness connector terminal and engine ground.

Connector & terminal

2.0 L model

(B135) No. 23 (+) — Chassis ground (−):
(B135) No. 31 (+) — Chassis ground (−):

2.5 L model

(B136) No. 34 (+) — Chassis ground (−):
(B136) No. 26 (+) — Chassis ground (−):

QUESTION
Is the voltage 0 V?
Yes	No
	There is a short circuit in the battery voltage circuit or ignition switch “ON” circuit. Repair the harness between IMM ECM and ECM.