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EN(H6DO)-178 ENGINE (DIAGNOSTICS) DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) Step Value Yes No 1 CHECK DTC ON DISPLAY. Displayed 2 CHECK HARNESS BETWEEN ECM AND O2 (A/F) sensor. 3) Measure resistance of harness between ECM connectors. Connector & terminal (B137) No. 30 — (B137) No. 20: Does the measured value exceed the spec- 1 M Ω Repair ground 3 CHECK INPUT SIGNAL FOR ECM. connector. 2) Turn ignition switch to ON. and chassis ground. Connector & terminal (B137) No. 30 (+) — Chassis ground ( −−−− ): Is the measured value within the specified 3.5 — 4.5 V Repair power 4 CHECK ECM INPUT VOLTAGE. Connector & terminal (B137) No. 20 (+) — Chassis ground ( −−−− ): Is the measured value within the specified 2.5 — 4.95 V Replace front O2 Repair power |