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Home >> Acura >> 1993 >> Legend Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Trouble Codes >> Code 6: Coolant Sensor
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Code 6: Coolant Sensor

  1. Turn ignition off. Remove ACG fuse (No. 15, 7.5-amp) from underdash fuse box for 10 seconds to reset ECM. If light is off, problem is intermittent. Check for poor and loose connections at coolant sensor, ECM and right shock tower. Test drive vehicle and retest.
  2. If MIL 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 voltage is about 5 volts, go to step 5. If voltage is not about 5 volts, connect connector "D" of ECM Test Harness (07LAJ-PT3010A ) to ECM, leaving vehicle wiring harness disconnected. Turn ignition on. Measure voltage between test terminals D13 (+) and D22 (-). See Figure .
  4. If voltage is about 5 volts, repair open or short in Red/White wire between ECM terminal D13 and coolant sensor. If voltage is not about 5 volts, replace ECM and retest.
  5. If voltage was about 5 volts in step 3, measure voltage between Red/White (+) and Green/White (-) wire terminals. If voltage is not about 5 volts, repair open in Green/White wire between ECM connector terminal D22 and coolant sensor. If about 5 volts are present, replace ECM and retest.
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