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EN(H6DO)-282 ENGINE (DIAGNOSTICS) DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) Step Value Yes No 1 CHECK OUTPUT SIGNAL FROM ECM. voltage between ECM terminal and ground. NOTE: Radiator fan relay operation can be executed Connector & terminal (B137) No. 28 (+) — Chassis ground ( −−−− ): (B137) No. 17 (+) — Chassis ground ( −−−− ): Does the measured value change within 0 — 10 V Repair poor con- 2 CHECK GROUND SHORT CIRCUIT IN RADI- remove main fan relays from A/C relay 3) Measure resistance of harness between ECM connector and chassis ground. Connector & terminal (B137) No. 28 — Chassis ground: Does the measured value exceed the spec- 1 M Ω Repair ground 3 CHECK POWER SUPPLY FOR RELAY. box (F/B) connector and chassis ground. Connector & terminal (F66) No. 5 (+) — Chassis ground ( −−−− ): (F30) No. 24 (+) — Chassis ground ( −−−− ): Does the measured value exceed the spec- 10 V Repair open circuit 4 CHECK MAIN FAN RELAYS. terminals. Terminal (F66) No. 5 — No. 7: Is the measured value within the specified 87 — 107 Ω Replace main fan 5 CHECK OPEN CIRCUIT IN MAIN FAN RE- Connector & terminal (B137) No. 28 — (F66) No. 7: Is the measured value less than the specified 1 Ω Repair harness NOTE: |