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Home >> GMC >> 1999 >> Forward Control 6.5 F, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0100-P0134 >> DTC P0118 >> DTC P0118: ECT Sensor Circuit-Low Temperature (1.9L SATURN) >> Diagnostic Procedures

Diagnostic Procedures

  1. Turn ignition on. Connect scan tool and monitor ECT sensor reading. If ECT reading is less than -32°F (-35°C), go to next step. If ECT reading is not less than -32°F (-35°C), problem is intermittent. See DIAGNOSTIC AIDS .
  2. Disconnect ECT sensor harness connector. Using a fused jumper wire, jumper ECT harness connector terminals together. If ECT reading is greater than 266°F (130°C), replace ECT sensor. If ECT reading is not greater than 266°F (130°C), go to next step.
  3. Remove jumper wire. Jumper ECT signal circuit to ground. If ECT reading is greater than 266°F (130°C), go to step  5. If ECT reading is not greater than 266°F (130°C), go to next step.
  4. Remove jumper wire. Turn ignition off. Disconnect PCM harness connectors. Using DVOM, check for continuity in ECT signal circuit between ECT sensor and PCM. If continuity is present, PCM or terminal connections are faulty. Repair as necessary. If continuity is not present, repair open circuit.
  5. Using DVOM, check for continuity in ECT ground circuit between ECT sensor and PCM. If continuity is present, PCM or terminal connections are faulty. Repair as necessary. If continuity is not present, repair open circuit.
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