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Home >> Geo >> 1992 >> Prizm LSi, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Code Charts (Except GSI) >> Code 31, Map Sensor, Open Or Shorted Circuit >> Notes
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Code 31, Map Sensor, Open Or Shorted Circuit: Notes

The MAP sensor responds to changes in manifold pressure. ECM receives a signal voltage that varies between 1-1.5 volts at closed throttle idle, to approximately 4-4.5 volts at wide open throttle (low vacuum). If MAP sensor fails, ECM substitutes a fixed MAP value and uses TPS to control fuel delivery.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Verifies 5-volt reference is available from ECM.
  2. Verifies ECM is grounding the circuit.
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