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Manifold Absolute Pressure (Map) Sensor Test

  1. Check and repair vacuum hose connections at throttle body and MAP sensor. Check output voltage at MAP sensor connector terminal "B" (marked on sensor body) with ignition on but engine NOT running. Voltage reading should be 4-5 volts. If engine is hot and idling in neutral, reading should be .5-1.5 volts lower. Check voltage at terminal No. 33 of ECU connector. Reading should be same as that at terminal "B" on MAP sensor connector. See Figure.
  2. With ignition on, check MAP sensor supply voltage at terminal "C". Reading should be 4.5-5.5 volts. Same voltage reading should be obtained at terminal No. 16 on ECU harness connector. If necessary, repair or replace wiring harness. Check MAP sensor ground circuit at terminal "A" and terminal No. 17 of ECU connector. Repair wiring if necessary.
  3. Using ohmmeter, check MAP sensor ground circuit between terminals No. 17 and 2 of ECU connector. If circuit is incomplete, check sensor ground connection on bellhousing near starter housing. Replace ECU if ground is good. If terminal No. 17 is shorted to 12 volts, repair problem before ECU is replaced.
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