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Code 6 - Coolant (TW) Sensor

  1. Turn ignition off and remove hazard fuse at battery positive terminal for 10 seconds to reset ECU. Start engine and observe Check Engine light. If light is off, problem is intermittent. Test drive and check again.
  2. If light is on, warm engine to normal operating temperature (cooling fan on). Disconnect C76 and C1 connectors beside battery. See Fig 1 . Measure resistance between Red/White wire terminal and Green wire terminal of C1 connector, on sensor side of harness. If resistance value is not 200-400 ohms, inspect for short or open in Red/White or Green wire between C1 connector and coolant sensor. If wires are okay, replace coolant sensor.
  3. If resistance values are within specification, reconnect C76 and C1 connectors. Disconnect 2-wire connector directly from coolant sensor. Measure voltage between ground and Red/White wire on sensor harness. If voltage is not about 5 volts, go to step 5). If voltage reads about 5 volts, measure voltage between Red/White (pos.) and Green (neg.) wires. If about 5 volts is not present, repair open in Green and/or Brown/Black wire between ECU terminal C12 and sensor.
  4. If voltage reading from Green wire to Red/White wire of coolant sensor harness was about 5 volts, substitute a known good ECU. If about 5 volts is now read, replace original ECU.
  5. If voltage reading from ground to Red/White wire of coolant sensor harness was not about 5 volts in step 3), turn ignition off. Connect system checker harness between ECU and ECU connector. Turn ignition on. Measure voltage between terminals C6 (pos.) and C12 (neg.). If about 5 volts is present, repair open in Red/White wire between ECU terminal C6 and coolant sensor.
  6. If voltage reading is not about 5 volts, disconnect "C" connector from main wiring harness, not at ECU. Measure voltage between terminals C6 (pos.) and C12 (neg.). If about 5 volts is now indicated, repair short in Red/White wire between ECU terminal C6 and sensor.
  7. If about 5 volts is not indicated, substitute a known good ECU. If condition is rectified, replace original ECU.
Fig 1: Integra Connector Identification
G94318Courtesy of AMERICAN HONDA MOTOR CO., INC.
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