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AC-28 HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) DIAGNOSTICS FOR A/C SYSTEM FAILURE (LHD MODEL) 11 CHECK POWER SUPPLY TO SUB FAN MO- CAUTION: Be careful not to overheat engine during re- 1) Turn ignition switch to OFF. engine coolant temperature increases over ° C (212 ° F). 4) Stop the engine and turn ignition switch to ON. 5) Measure voltage between sub fan motor connector and chassis ground. Connector & terminal 4 CYLINDER MODEL (F16) No. 2 (+) — Chassis ground ( −−−− ): 6 CYLINDER MODEL (F16) No. 1, 2, 3 (+) — Chassis ground −−−− ): Does the measured value exceed the spec- 10 V Repair harness for 12 CHECK GROUND CIRCUIT OF SUB FAN connector and chassis ground. Connector & terminal 4 CYLINDER MODEL (F16) No. 1 — Chassis ground: 6 CYLINDER MODEL (F16) No. 4 — Chassis ground: Does the measured value exceed the spec- 1 Ω Repair harness 13 CHECK POOR CONTACT. There is no poor contact. Repair poor con- 14 CHECK SUB FAN MOTOR. − ) terminal to terminal No. 1 of sub fan motor connector. − ) terminal to ter- minal No. 4 of sub fan motor connector. Sub fan motor rotates. Replace sub fan 15 CHECK EACH SENSOR AND POTENTIOME- Each sensor and potentiome- Replace sensor Step Value Yes No |