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Home >> Mitsubishi >> 1993 >> Precis Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> Code 25: Barometric Pressure Sensor Failure >> Harness Inspection
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Harness Inspection

  1. Check continuity of ground circuit. Ensure ignition is off. Disconnect airflow sensor connector. Using ohmmeter, check resistance between sensor harness connector No. 6 (Black wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
  2. Measure sensor power supply voltage. Turn ignition on. Using DVOM, measure voltage between sensor harness connector terminal No. 1 (Green/Red wire) and vehicle ground. Voltage should be 4.8-5.2 volts. If voltage is within specification, go to step 4.
  3. If voltage is not within specification, turn ignition off. Disconnect ECM 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 sensor harness connector terminal No. 1 (Green/Red 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.
  4. Check continuity of output circuit between barometric pressure sensor and ECM. Connect jumper wire between ECM harness connector terminal No. 21 (Brown wire) 24-pin connector and vehicle ground. Using ohmmeter, check resistance between sensor harness connector No. 5 (Brown wire) and vehicle ground. If continuity does not exist, check and repair circuit as needed.
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