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HAIMA 7 Service Manual(MT)-U Heater and air conditioning system

Troubleshooting Step

Troubleshooting Step Inspection Action *25 Inspect continuity of wiring harness between fuse block and a/c relay (at switch side). • Turn ignition switch to on position. • Measure voltage at a/c relay connector terminal d (a/c control signal). • Is voltage approximately equivalent to b+ (positive battery voltage)? Yes No Go to next step. Repair wiring harness between fuse block and a/c relay, go to step 28. *26 Inspect a/c relay (at switch side) • Inspect a/c relay. • Is it normal? Yes Install a/c relay, go to next step No Replace a/c relay, go to step 28. *27 Verify whether malfunction is in electromagnetic clutch or wiring harness (continuity between a/c relay and electromagnetic clutch). • Measure voltage at electromagnetic clutch connector terminal a (a/c control signal). • Is voltage approximately equivalent to b+ (positive battery voltage)? Yes No Inspect electromagnetic clutch, and then go to next step. Repair wiring harness between a/c relay and electromagnetic clutch, go to next step. *28 Verify whether malfunction symptom occurs after repair. • Does cold air blow out (if the result of performance test of refrigeration system is normal.)? Yes Troubleshooting completed. Explain causes to customer. No Recheck malfunction symptoms, and then repeat from step 1 if malfunction reoccurs. Xii. Noise with operation of a/c system 12 Noise with operation of a/c system Malfunction symptom Possible causes Noise from a/c compressor hose of electromagnetic clutch or refrigerant pipeline Electromagnetic clutch operation noise. Step 3 • A/c compressor operation noise. Steps 4-8 • A/c compressor sliding noise. Steps 9-11 • Hose or refrigerant pipeline interference noise. Steps 12 U-42

Troubleshotting Troubleshooting procedure Step Inspection Action 1 Inspect a/c compressor skidding noise • Is there a strident sound (a/c compressor skidding noise)? 2 Inspect a/c compressor interference noise • Is there a squeaking or whirling sound (interference noise)? Yes Go to step 9. No Go to next step. Yes Go to step 12. No Go to next step. 3 Inspect electromagnetic clutch operation noise • Is there “click” sound (electromagnetic clutch operation noise)? Yes No Adjust clearance between pressure plate of electromagnetic clutch and a/c compressor pulley, go to step 13 (see u-27, electromagnetic clutch adjustment). Go to next step. 4 Inspect duration of a/c compressor noise • Is noise heard continuously for more than 3 seconds after a/c compressor started? 5 Inspect idling speed • Inspect idling speed. See f-3, idling speed inspection. • Is it normal? 6 Verify whether malfunction is in compressor oil or a/c compressor. • Drain all compressor oil. • Is compressor oil contaminated by metal powder? Yes Go to next step. No Condition is normal.(noise always occurs for 2-3 seconds immediately after a/c compressor started) Yes Adjust idling speed, go to step 13. No Go to next step. Yes Change compressor oil, go to step 13. No Go to next step. 7 Verify whether malfunction is in the whole a/c system or a/c compressor or condenser. • Does compressor oil become white and is it mixed with water? 8 Inspect compressor oil • Is compressor oil darker than normal state? Is there any aluminum fragment? Yes No Yes Replace the whole a/c system (except heater), go to step 13. Go to next step. Replace a/c compressor and condenser, go to step 13. (because a/c compressor might wear out and fluid reservoir/drier might be clogged, thus condenser should be replaced.) No Condition is normal. Recheck the malfunction symptom. U-43

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