2002 Acura 1.7EL StandardFACTORY OEM SERVICE PROCEDURE

A/C Signal Circuit Troubleshooting

  1. Turn the ignition switch ON (II).
  2. Momentarily connect ECM/PCM connector terminals A24 and E18 with a jumper wire several times.
    Fig 1: Momentarily Connecting ECM/PCM Connector Terminals A24 & E18
    G01954851

    Is there a clicking noise from the A/C compressor clutch? 

    1. YES  - Go to step 3.
    2. NO  - Go to step  6.
  3. Start the engine.
  4. Turn the blower switch ON.
  5. Turn the A/C switch ON.

    Does the A/C operate? 

    1. YES  - The air conditioning signal is OK.
    2. NO  - Reprogram the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck (see ECM/PCM REPROGRAMMING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
  6. Momentarily connect the under-hood fuse/relay box 14P connector terminal No. 10 and body ground with a jumper wire several times.
    Fig 2: Momentarily Connecting Under-Hood Fuse/Relay Box 14-Pin Connector Terminal No. 10 & Body Ground
    G01954852

    Is there a clicking noise from the A/C compressor clutch? 

    1. YES  - Repair open in the wire between the ECM/PCM (E18) and the A/C clutch relay.
    2. NO  - Check the A/C system for other symptoms.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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