HOW DO I FIX CODE PO118

  • Tiny
  • Anonymous
  • 2000 HONDA ACCORD
  • 15,000 MILES

How do I fix code PO118

Tuesday, November 27th, 2012 AT 1:57 AM

1 Reply

  • Tiny
  • ASEMaster6371
  • EXPERT
  • 25,554 POSTS

DTC P0118: ECT Sensor Circuit High Voltage

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

Is 4 F (- 20 C) 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 the ECM/PCM.

Disconnect the ECT sensor connector.

Connect ECT sensor 2P connector terminals No.1 and No.2 with a jumper wire.
Check the ECT with the scan tool.

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

YES - Go to step 6.

NO - Replace the ECT sensor.

Turn the ignition switch OFF.

Connect ECM/PCM connector terminals C18 and C26 with a jumper wire.
Turn the ignition switch ON (II).
Check the ECT with the scan tool.

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

YES - Substitute a known-good ECM/PCM and recheck. If normal voltage is indicated, replace the original ECM/PCM.

NO - Repair open in the wire between the ECM/PCM (C18, C26) and the ECT sensor.

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Tuesday, November 27th, 2012 AT 1:59 AM

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