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A/C Compressor Clutch Circuit Test: S2000

  1. Check No. 58 (20-amp) fuse in main underhood fuse/relay box and No. 20 (7.5-amp) fuse in underdash fuse/relay box. If fuses are okay, go to next step. If any fuse is blown, check circuits for which fuse protects and replace fuse. See WIRING DIAGRAMS article.
  2. Using a scan tool, check engine coolant temperature. If coolant temperature is not higher than normal, go to next step. If coolant temperature is higher than normal, repair cause of high coolant temperature. See appropriate article in ENGINE COOLING.
  3. Remove A/C compressor clutch relay from main underhood fuse/relay box. Test A/C compressor clutch relay. See MODULES, MOTORS, RELAYS & SOLENOIDS . If relay is okay, go to next step. Replace relay if faulty.
  4. Measure voltage between ground and A/C compressor clutch relay in main underhood fuse/relay box socket No. 1. See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, replace main underhood fuse/relay box.
  5. Using a jumper wire, connect A/C compressor clutch relay fuse/relay box sockets No. 1 and 2 (Blue/Red wire) together. If compressor clutch clicks, go to next step. If compressor clutch does not click, go to step  8.
  6. Turn ignition off. Remove jumper wire. Turn ignition on. Measure voltage between ground and A/C compressor clutch relay fuse/relay box socket No. 4 (Black/Yellow wire). See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Black/Yellow wire between No. 20 (7.5-amp) fuse in underdash fuse/relay box and A/C compressor clutch relay connectors. See WIRING DIAGRAMS article.
  7. Turn ignition off. Reinstall A/C compressor clutch relay. Ensure A/C switch is off. Turn ignition on. Backprobing, measure voltage between body ground and PCM connector "A" (32-pin connector) terminal No. 17 (Red wire). See Figure. If battery voltage exists, check for loose wires and/or poor connections at PCM connectors. Repair any problems found. If problems are not found, substitute known-good PCM and retest. See SUBSTITUTING POWERTRAIN CONTROL MODULE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - S2000 article. If symptom or indication goes away, replace original PCM. If battery voltage does not exist, repair open in Red wire between A/C compressor relay and PCM connectors. See WIRING DIAGRAMS article.
    8. NOTE: Single-pin A/C compressor clutch connector contains a Black/Red wire. This wire changes to a Blue/Red wire at 16-pin Light Blue in-line connector located behind left kick panel.
  8. Turn ignition off. Remove jumper wire. Disconnect single-pin A/C compressor clutch connector. Check for continuity on Blue/Red wire between single-pin A/C compressor clutch connector and A/C compressor clutch relay fuse/relay box socket No. 2. See Figure. If continuity is present, check compressor clutch clearance, thermal protector and compressor clutch field coil. See GENERAL SERVICING article in AIR CONDITIONING & HEATING. If continuity is not present, repair open in Blue/Red wire between A/C compressor clutch and A/C compressor clutch relay connectors. See WIRING DIAGRAMS article.
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