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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)] 01–03B–45 01–03B End Of Sie NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [FS] A3U010318881W29 Diagnostic procedure End Of Sie 5 • Verify test results. • If vehicle is repaired, troubleshooting completed. • If vehicle is not repaired or additional diagnostic information is not available, replace PCM. STEP INSPECTION RESULTS ACTION 24 A/C is always on or A/C compressor runs continuously DESCRIPTION • A/C compressor magnetic clutch does not disengage. POSSIBLE CAUSE • Stuck engagement • A/C relay is stuck closed. • Short to GND between A/C switch and PCM • Short to GND circuit between A/C relay and PCM • A/C relay to magnetic clutch circuit shorts to battery power STEP INSPECTION RESULTS ACTION 1 • Connect WDS or equivalent to DLC-2. • Turn ignition key to ON. • Retrieve any DTC. • Is “DTC” displayed? Yes DTC displayed: • Go to appropriate DTC test. No No DTC displayed: • Go to next step. 2 • Start engine and run it at idle. • Turn A/C switch on. • Remove A/C relay. • Does A/C magnetic clutch disengage? Yes Inspect for following: • A/C relay is stuck closed. • Short to GND circuit between A/C relay and PCM If both items are okay, go to next step. No Inspect if circuit between A/C relay and magnetic • If circuit is okay, inspect magnetic clutch stuck 3 • Disconnect refrigerant pressure switch • Start engine and turn A/C switch on. Note • A/C should not work when disconnecting • Does A/C reading remain working? Yes Inspect for short to GND circuit between refrigerant No Go to next step. 4 • Reconnect refrigerant pressure switch • Turn off A/C switch. Note • A/C should not work when turning the A/C • Does A/C reading remain working? Yes Inspect following: • Short to GND circuit between A/C switch and A/C • Short to GND circuit between A/C amplifier and No Inspect if A/C switch is stuck closed. 5 • Verify test results. • If vehicle is repaired, troubleshooting completed. • If vehicle is not repaired or additional diagnostic information is not available, replace PCM. 1712-1U-01G(01-03B).fm 45 ページ 2001年6月29日 金曜日 午前9時33分 |