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ECT Sensor Circuit Troubleshooting

  1. Check the malfunction indicator lamp (MIL).

    Does the malfunction indicator lamp come on? 

    1. YES  -Refer to appropriate SELF-DIAGNOSTICS article.
    2. NO  -Go to step 2.
  2. Turn the ignition switch OFF.
  3. Disconnect the ECT sensor 2P connector (see REMOVAL & INSTALLATION article in ENGINE PERFORMANCE).
  4. Disconnect climate control unit connector B (20P).
  5. Turn the ignition switch ON (II).
  6. Measure the voltage between the No. 3 terminal of climate control unit connector B (20P) and body ground.
    Fig 1: Checking Voltage At Climate Control Unit Connector B (20P)
    G01156496Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    1. YES  -Check for loose wires or poor connections at climate control unit connector B (20P) and at the ECT sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.
    2. NO  -Repair open in the wire between the climate control unit and the ECT sensor.
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