ECT Sensor Circuit Troubleshooting
NOTE:
Before performing symptom troubleshooting, check for powertrain DTC (see HOW TO USE THE HONDA DIAGNOSTIC SYSTEM (HDS)
).
- Check the malfunction indicator lamp (MIL).
Does the malfunction indicator lamp come on?
- YES - Refer to the fuel and emissions systems DTCs (see HOW TO USE THE HONDA DIAGNOSTIC SYSTEM (HDS) ).
- NO - Go to Step 2.
- Turn the ignition switch OFF.
- Disconnect the ECT sensor 2P connector.
- Disconnect climate control unit connector B (30P).
- Turn the ignition switch ON (II).
- Measure the voltage between the No. 22 terminal of climate control unit connector B (30P) and body ground.Fig 1: Measuring The Voltage Between The No. 22 Terminal Of Climate Control Unit Connector B (30P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there about 5V?
- YES - Check for loose wires or poor connections at climate control unit connector B (30P) 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.
- NO - Repair open in the wire between the climate control unit and the ECT sensor.