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Home >> Oldsmobile >> 1989 >> Cutlass Calais Base, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.3L PFI Tests W/Codes >> Diagnosis & Testing >> Code 23, Mat Sensor Signal Volt Hi >> Notes

Code 23, Mat Sensor Signal Volt Hi: Notes

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. The following conditions must exist for a Code 23 to set:
    • Signal voltage indicates manifold air temperature is less than -29°F (-34°C).
    • Engine has been running for at least 320 seconds.
    • Vehicle speed is less than 15 MPH.
  2. Code 23 is set due to an open sensor, wire or connection. This test determines if wiring and ECM are okay.
  3. This test indicates if signal circuit No. 472 or 5-volt return circuit No. 469 is open.
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