1992 Acura Integra GS-RFACTORY OEM SERVICE PROCEDURE

Code 6: Coolant (TW) Sensor

  1. Turn ignition off. Remove BACK UP fuse from underhood fuse/relay box for 10 seconds to reset ECU. Start engine, and observe CHECK ENGINE light. If light is off, problem is intermittent. Check for poor and loose connections at coolant sensor. Test drive vehicle and retest.
  2. If CHECK ENGINE light is on and indicates Code 6, operate engine until cooling fan comes on. Turn engine off. Disconnect connector from coolant sensor. Measure resistance between sensor terminals. If resistance is not 200-400 ohms, replace coolant sensor.
  3. If resistance is 200-400 ohms, turn ignition on. Measure voltage between Red/White (+) wire terminal and body ground. If about 5 volts are present, go to step 6). If voltage is not about 5 volts on A/T models, disconnect 18-pin connector from A/T control unit. Turn ignition on.
  4. Recheck voltage at Red/White wire terminal. If voltage is about 5 volts, replace A/T control unit. If voltage is not about 5 volts, turn ignition off and reconnect A/T control unit. On all models, connect "D" connector of ECU Test Harness (07LAJ-PT3010A ) to ECU, leaving vehicle wiring harness disconnected. Turn ignition on. Measure voltage between test terminals D13 (+) and D22 (-).
  5. If about 5 volts are present, repair open or short in Red/White wire between ECU terminal D13 and coolant sensor. If about 5 volts are not present, substitute a known good ECU. If symptom/condition goes away, replace original ECU.
  6. If voltage is about 5 volts from step 3), measure voltage between Red/White (+) and Green/White wire terminal. If about 5 volts are not present, repair open in Green/White wire between ECU connector D22 and coolant sensor. If about 5 volts are present, substitute a known good ECU. If symptom/condition goes away, replace original ECU.
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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.