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SYMPTOM TROUBLESHOOTING 07-03–17 07-03 End Of Sie NO.9 NOISE WHILE OPERATING A/C SYSTEM id070300801200 Diagnostic procedure 13* INSPECT TO SEE WHETHER MALFUNCTION • Test voltage at the following terminal of magnetic clutch thermal protector. — Terminal A (magnetic clutch operation signal) • Is voltage approx. 12 V? Yes Inspect magnetic clutch, then go to Step 18. No Go to the next step. 14 INSPECT FUSE • Are A/C relay power supply fuses okay? Yes Go to the next step. No Replace fuse, then go to Step 18. If fuse burns out 15 INSPECT WIRING HARNESS BETWEEN • Test voltages at following terminals of A/C relay. — Terminal A (A/C relay control signal) — Terminal C (A/C control signal) • Are voltages approx. 12 V? Yes Go to the next step. No Repair wiring harness between fuse block and A/C relay, 16 INSPECT TO SEE WHETHER MALFUNCTION • Test voltage at the following terminal of A/C relay. — Terminal D (magnetic clutch operation signal) • Is voltage approx. 12 V? Yes Inspect wiring harness between A/C relay and magnetic • If above wiring harness is OK, go to the next step. • If above wiring harness malfunctions, repair wiring harness, then go to Step 18. No Replace A/C relay, then go to Step 18. 17 INSPECT EVAPORATOR TEMPERATURE • Inspect evaporator temperature sensor. • Is it okay? Yes Go to the next step. No Replace evaporator temperature sensor, then go to the next 18 CONFIRM THAT MALFUNCTION SYMPTOMS • Does cool air blow out? (Are the results of refrigerant system performance test okay?) Yes Troubleshooting completed. Explain repairs to customer. No Recheck malfunction symptoms, then repeat from Step 1 if STEP INSPECTION ACTION 9 Noise while operating A/C system. DESCRIPTION • Noise from magnetic clutch, A/C compressor, hose or refrigerant line. POSSIBLE CAUSE • Magnetic clutch operation noise • A/C compressor vane noise • A/C compressor slippage noise • Hose or refrigerant line interference noise STEP INSPECTION ACTION 1 CHECK A/C COMPRESSOR VANE NOISE • Is there a jingling, popping, beeping, or buzzing sound (A/C compressor vane Yes Go to Step 5. No Go to the next step. 2 INSPECT A/C COMPRESSOR SLIPPAGE • Is there a squeaking or whirling sound (A/C compressor slippage noise)? Yes Go to Step 14. No Go to the next step. 3 INSPECT A/C COMPRESSOR • Is there a rattling or vibrating sound (interference noise)? Yes Go to Step 18. No Go to the next step. 4 INSPECT MAGNETIC CLUTCH OPERATION • Is there a clicking sound (magnetic clutch operation noise)? Yes Adjust clearance between pressure plate of magnetic clutch No Condition is normal. (Recheck malfunction symptoms.) 1871-1U-06B(07-03).fm 17 ページ 2006年3月15日 水曜日 午前11時28分 |