DTC P0125: Engine Coolant Temperature Sensor, Slow Response
CAUTION:
When substituting or replacement of PCM is recommended, see PCM REMOVAL & REPLACEMENT
for important precautions.
- Start engine and let it idle.
- Check ECT SENSOR in the DATA list with the Honda PGM tester or the HDS. If about 86°F (30°C) or less, or 2.61 volts or higher is indicated, go to next step. If about 86°F (30°C) or less, or 2.61 volts or higher is not indicated, problem is intermittent, system is OK at this time. Check thermostat and cooling system.
- Let engine idle for 15 minutes. Check ECT SENSOR in the DATA list with the Honda PGM tester or the HDS. If about 86°F (30°C) or less, or 2.61 volts or higher is indicated, go to next step. If about 86°F (30°C) or less, or 2.61 volts or higher is not indicated, problem is intermittent, system is OK at this time. Check thermostat and cooling system.
- Turn ignition off. Replace ECT sensor.
- Turn ignition on. With the Honda PGM tester or the HDS, do PCM RESET in the CLEAR menu. Do the PCM idle learn procedure. See PCM IDLE LEARN PROCEDURE .
- Allow engine to cool to between 19°F (-7°C) and 86°F (30°C).
- Start engine and let engine idle for 20 minutes.
- Check for Temporary DTCs or DTCs in the DTC menu. If DTC P0125 is set, check for poor connections at ECT sensor and PCM. Go to step 1 . If any other Temporary DTCs or DTCs are set, troubleshoot those indicated. If there are no Temporary DTCs or DTCs set, go to next step.
- Monitor the OBD STATUS for DTC P0125 in the DTCs menu with the Honda PGM tester or the HDS. If it PASSED, troubleshooting is complete. If it is FAILED, check for poor connections at ECT sensor and PCM. Go to step 1 . If it is NOT COMPLETED, go to step 6 and recheck.