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EN(H4SO)-240 ENGINE (DIAGNOSTICS) DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) Step Value Yes No 1 CHECK OUTPUT SIGNAL FROM ECM. portion of instrument panel (on the driver's 3) Turn ignition switch to ON. voltage between ECM terminal and ground. NOTE: Radiator fan relay operation can be executed Connector & terminal (B134) No. 14 (+) — Chassis ground ( −−−− ): 0 - 10 V Repair poor con- 2 CHECK GROUND SHORT CIRCUIT IN RADI- remove main fan relay from A/C relay 3) Measure resistance of harness between ECM connector and chassis ground. Connector & terminal (B134) No. 14 — 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 ( −−−− ): Does the measured value exceed the spec- 10 V Repair open circuit 4 CHECK MAIN FAN RELAY. terminals. Terminal 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 (B134) No. 14 — (F66) No. 7: Is the measured value less than the specified 1 Ω Repair harness NOTE: |