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DTC P0118: Engine Coolant Temp. (ECT) Circuit High Input

  1. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Select ECT parameter. If display reads -40°F (-40°C), go to next step. If display reading is not -40°F (-40°C), check for an intermittent problem. See TESTS W/O CODES article.
  2. Turn ignition off. Disconnect ECT sensor harness connector located near coolant outlet. Turn ignition on. Measure voltage between ground and Light Green/Red wire of ECT sensor harness connector. If reading is 4-6 volts, go to next step. If reading is greater than 6 volts, check Light Green/Red wire for short to battery power. If reading is less than 4 volts, check Light Green/Red wire for an open. Repair as necessary. If wiring is okay, replace PCM.
  3. Turn ignition off. Disconnect PCM harness connector "B". Check continuity between PCM harness connector "B", terminal No. 9 and Green/Red wire at ECT sensor harness connector. If continuity exists, go to next step. If continuity does not exist, check Green/Red wire for an open or poor connection. Repair as necessary.
  4. Connect PCM harness connector. Turn ignition on. Using a fused jumper wire, jumper terminals of ECT sensor harness connector together. If display on scan tool reads 246°F (119°C), replace ECT sensor. If display reading is not 246°F (119°C), replace PCM.
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