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Home >> Mitsubishi >> 1993 >> Precis Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> Code 24: Vehicle Speed Sensor Failure >> Harness Inspection
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Harness Inspection

  1. Check VSS power supply voltage from ECM. Disconnect VSS harness connector from back of instrument panel. Instrument panel removal may assist in accessing harness connector. Turn ignition on. Using DVOM, measure voltage between VSS harness connector terminal No. 2 (Yellow/White wire) and vehicle ground. Voltage should be 4.5-4.9 volts.
  2. If voltage is within specification, circuit is okay. If voltage is not within specification, turn ignition off. Disconnect ECM harness connector. Connect jumper wire between ECM harness connector terminal No. 18 (Yellow wire) 22-pin connector (California), and terminal No. 19 (Yellow/White wire) 24-pin connector (Except California) and vehicle ground. See Figure and Figure . Using ohmmeter, check resistance between VSS harness connector terminal No. 2 (Yellow/White 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.
  3. Check ground circuit of sensor. Using ohmmeter, check resistance between VSS 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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