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Home >> Mitsubishi >> 1993 >> Precis Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> Code 23: Top Dead Center Sensor Failure >> Harness Inspection
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Harness Inspection

  1. Inspect TDC sensor power supply circuit. Disconnect TDC sensor harness connector. Turn ignition on. Using DVOM, measure voltage between sensor harness connector terminal No. 2 (Red wire) and vehicle ground. Voltage should be battery voltage.
  2. Check continuity of ground circuit. Turn ignition off. Using ohmmeter, check resistance between sensor harness connector terminal No. 3 (Yellow wire), and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
  3. Check sensor output voltage from ECM. Turn ignition on. Using DVOM, measure voltage between TDC sensor harness connector terminal No. 4 (White wire) and vehicle ground. Voltage should be 4.8-5.2 volts. If voltage is within specification, circuit is okay. If voltage is not within specification, turn ignition off.
  4. Disconnect ECM connector. Connect jumper wire between ECM harness connector terminal and vehicle ground. See TDC INPUT TERMINAL ID  for ECM terminal identification. Using ohmmeter, check resistance between TDC harness connector terminal No. 3 (Yellow wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed. If continuity exists, substitute ECM with known good unit and retest.
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