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Air Conditioning Signal: 2.5TL

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1998 Acura Integra, 1998 Acura 3.5RL, 1998 Acura 3.2TL, 1998 Acura 3.0CL, and 1998 Acura 2.5TL. However, it is still accessible from the selected car via links, so may be relevant.
  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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