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Air Conditioning Signal: 2.5TL

  1. Turn ignition off. Disconnect A/C pressure switch connector located at left front of engine compartment, next to receiver dryer. Turn ignition on. Backprobing, measure voltage between PCM 26-pin connector terminal No. 26 (Brown/Black wire) and PCM 16-pin connector terminal No. 3 (Blue/Black wire). See Figure. If battery voltage exists, go to step 3). If battery voltage does not exist, go to next step.
  2. Turn ignition off. Disconnect PCM 16-pin connector. Check continuity between ground and PCM 16-pin harness connector terminal No. 3 (Blue/Black wire). See Figure. If continuity exists, repair short in Blue/Black wire between PCM 16-pin connector and A/C pressure switch. If continuity does not exist, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM. Ensure A/C is operating properly. See A/C-HEATER SYSTEM article in AIR CONDITIONING & HEAT section.
  3. Turn ignition off. Reconnect A/C pressure switch. Turn ignition on. Using a jumper wire, backprobing, momentarily connect PCM 26-pin connector terminals No. 8 (Red/Blue wire) and No. 26 (Brown/Black wire), several times. See Figure. If A/C compressor clutch clicks, go to step 5). If A/C clutch does not click, go to next step.
  4. Locate A/C clutch relay in left rear corner of engine compartment. Using a jumper wire, backprobing, connect A/C clutch relay connector terminal No. 2 (Red/Blue wire) to ground, several times. If A/C clutch clicks, repair open in Red/Blue wire between PCM 26-pin connector and A/C clutch relay. If A/C clutch does not click, other A/C problems exist. See A/C-HEATER SYSTEM article in AIR CONDITIONING & HEAT section.
  5. Start engine. Turn blower and A/C switches on. If A/C operates, A/C signal is okay. If A/C does not operate, measure voltage between PCM 26-pin connector terminal No. 26 (Brown/Black wire) and 16-pin connector terminal No. 3 (Blue/Black wire). See Figure.
  6. If voltage is not less than one volt, repair open in Blue/Black wire between PCM 16-pin connector and A/C switch. If voltage is less than one volt, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM. Ensure A/C is operating properly. See A/C-HEATER SYSTEM article in AIR CONDITIONING & HEAT section.
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