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Home >> Hyundai >> 1994 >> Scoupe Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> Code 3145 - Coolant Temperature Sensor Failure >> Harness Inspection

Harness Inspection

  1. Measure sensor power supply voltage. Disconnect sensor harness connector. Turn ignition on. Using DVOM, measure voltage at terminal No. 2 (Yellow/Red wire). Voltage should be 4.6-4.8 volts. If voltage is within specification, go to step 3). If voltage is not within specification, go to step 2).
  2. Turn ignition off. Disconnect ECM harness connector. Connect jumper wire between ECM harness connector terminal No. 45 and vehicle ground. See Figure . Using ohmmeter, check continuity between sensor harness connector terminal No. 2 (Yellow/Red wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed. If continuity does exist, replace ECM and retest. Go to step 3).
  3. Check continuity of sensor to ECM ground circuit. Ensure ignition is off. Using ohmmeter, check resistance between sensor harness connector terminal No. 1 (Black wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
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