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Home >> Eagle >> 1988 >> Medallion LX, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> MPFI System >> Component Testing >> Map Sensor >> Electrical Circuit

Electrical Circuit

  1. Test MAP sensor supply voltage at sensor connector terminal "C" (marked on sensor body). Turn ignition on. Voltage should be 4.5-5.5 volts.
  2. Measure voltage at ECU connector terminal "16". With ignition on, voltage should be the same. If voltage is not present, repair or replace wiring harness as necessary. See Fig 1 .
    Fig 1: ECU Connector Terminal Identification.
    G94480Courtesy of CHRYSLER MOTORS.
  3. Test MAP sensor output voltage at sensor connector terminal "B" (marked on sensor body). Turn ignition on with engine off. Voltage should be 4-5 volts.
  4. Measure voltage at ECU connector terminal "33". With ignition on and engine off, voltage should be 4-5 volts. If voltage is not present, repair or replace wiring harness as necessary.
  5. Start and warm engine. With engine idling, voltage at MAP sensor connector terminal "B" (marked on sensor body) and ECU connector terminal "33" should be .5-1.5 volts.
  6. Using an ohmmeter, test MAP sensor ground circuit. Check for continuity between MAP sensor connector terminal "A" (marked on sensor body) and ECU connector terminal "17". Repair or replace wiring harness if no continuity exists.
  7. Check for continuity between ECU connector terminal "17" and "2". Check continuity between ECU connector terminal "2" and ground connection at right side of engine block.
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