PGM-FI System

DTC Troubleshooting (cont'd)

11-364  

DTC P0118: ECT Sensor Circuit High Voltage

  1. Turn the ignition switch ON (II).
  2. Check the ECT with the scan tool.

Is -20°C (-4°F) or less (or L-Limit in Honda mode of PGM Tester) or 5 V indicated?

YES

- Go to step 3.

NO

- Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the ECT sensor and at the ECM/PCM.


  1. Turn the ignition switch OFF.
  2. Disconnect the ECT sensor 2P connector.
  3. Connect the ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.

ECT SENSOR 2P CONNECTOR

JUMPER WIRE

Wire side of female terminals

  1. Turn the ignition switch ON (II).

  1. Check the ECT with the scan tool.

Is -20°C (-4°F) or less (or L-Limit in Honda mode of PGM Tester) or 5 V indicated?

YES

- Go to step 8.

NO

- Replace the ECT sensor.


  1. Turn the ignition switch OFF.
  2. Remove the jumper wire.
  3. Connect ECM/PCM connector terminals A10 and B8 with a jumper wire.

ECM/PCM CONNECTORS

JUMPER WIRE

Wire side of female terminals

  1. Turn the ignition switch ON (II).
  2. Check the ECT with the scan tool.

Is -20°C (-4°F) or less (or L-Limit in Honda mode of PGM Tester) or 5 V indicated?

YES

- Substitute a known-good ECM/PCM and recheck (see page 11-313). If symptom/indication goes away, replace the original ECM/PCM.

NO

- Repair open in the wire between the ECM/PCM (A10, B8) and the ECT sensor.