Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 1999 >> Forward Control P12 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0100-P0134 >> DTC P0117 >> DTC P0117: ECT Sensor Circuit-High Temperature (1.9L SATURN) >> Diagnostic Procedures

Diagnostic Procedures

  1. Turn ignition on. Connect scan tool and monitor ECT sensor temperature reading. If scan tool reading is greater than 284°F (140°C), go to next step. If ECT reading is not greater than 284°F (140°C), problem is intermittent. See DIAGNOSTIC AIDS .
  2. Disconnect ECT sensor harness connector. If ECT reading is less than -32°F (-35°C), check tightness of harness connector terminals or replace ECT sensor. If ECT reading is not less than -32°F (-35°C), go to next step.
  3. Turn ignition off. Disconnect PCM harness connector J2. Remove ECT signal circuit terminal from PCM harness connector. Reconnect PCM. Turn ignition on. 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), go to step  5.
  4. Repair ECT sensor signal circuit for a short to ground or short to ECT sensor ground circuit.
  5. Replace PCM. Program replacement PCM using required equipment.
scientia non olet · About Mike's Workshop Manuals