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Home >> Mitsubishi >> 1993 >> Precis Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> Code 15: Idle Speed Control Motor Position Sensor Failure >> Harness Inspection (Except California)
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Harness Inspection (Except California)

  1. Measure power supply voltage to sensor. Disconnect Motor Position Sensor (MPS) harness connector. Turn ignition on. Using DVOM, measure voltage between MPS harness connector terminals No. 2 (Green/Red wire) and No. 6 (Green/Yellow wire) and vehicle ground. Voltage should be 4.8-5.2 volts. If voltage is not within specification, check continuity of circuit.
  2. Turn ignition off. Disconnect ECM harness connector. Connect jumper wire between ECM harness connector terminal No. 14 (Green/Red wire) 24-pin connector and vehicle ground. See Figure and Figure . Using ohmmeter, check resistance between MPS harness connector terminals No. 2 (Green/Red wire) and vehicle ground.
  3. If continuity does not exist, inspect and repair circuit as needed. Move jumper wire to ECM harness connector terminal No. 24 (Green/Yellow wire). Using ohmmeter, check resistance between MPS harness connector terminals No. 6 (Green/Yellow wire) 42-pin connector and vehicle ground. If continuity does not exist, inspect and repair circuit as needed. If continuity does exist, substitute ECM with known good unit and retest.
  4. Check continuity of ground circuit. Using ohmmeter, check resistance between MPS harness connector terminal No. 3 (Black wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
  5. Check continuity of input circuit between MPS and ECM. Connect jumper between ECM harness connector terminal No. 20 (Light Green wire) 24-pin connector and vehicle ground. Using ohmmeter, check resistance between MPS harness connector terminal No. 5 (Light Green wire) and vehicle ground. If continuity does not exist, inspect and repair wire as needed.
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