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Manifold Absolute Pressure (Map) Sensor

  1. Ensure ignition is off. To check MAP sensor supply voltage, disconnect electrical connector from MAP sensor. See MAP SENSOR LOCATIONS  table.
    NOTE: MAP sensor may also be identified using appropriate illustration in THEORY/OPERATION article. The MAP sensor has a vacuum hose connected to it and may be identified by wire colors. See appropriate wiring diagram in WIRING DIAGRAMS article.
    MAP SENSOR LOCATIONS

    Application Location
    MR2 Passenger's Side Of Engine Bay, Near Strut Tower
  2. Turn ignition on. Using voltmeter, measure voltage between terminals VC or VCC and E2 of electrical connector on wiring harness. See Fig 1. The VC or VCC and E2 terminals are the 2 outer terminals on all models. Voltage should be within specification. See MAP SENSOR SUPPLY VOLTAGE SPECIFICATIONS  table.
    MAP SENSOR SUPPLY VOLTAGE SPECIFICATIONS

    Application Volts
    MR2 4.50-5.50
  3. If supply voltage is not within specification, check wiring circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. If supply voltage is correct, turn ignition off. Reinstall electrical connector on MAP sensor.
  4. To check MAP sensor output voltage, turn ignition on. Disconnect MAP sensor vacuum hose from intake manifold. Connect voltmeter to terminals PIM and E2 of Engine Control Module (ECM). See Fig 2, Fig 3 and Fig 4. See ECM LOCATION table below.
    ECM LOCATION

    Application Location
    MR2 Driver's Side Rear Corner Of Engine Compartment
  5. Measure and record output voltage under ambient atmospheric pressure. Attach vacuum pump to MAP sensor.
  6. Apply vacuum in specified increments and measure MAP sensor output voltage drop at each increment. See MAP SENSOR OUTPUT VOLTAGE DROP SPECIFICATIONS  table. Replace MAP sensor if output voltage drop is not within specification.
MAP SENSOR OUTPUT VOLTAGE DROP SPECIFICATIONS

Applied Vacuum: In. Hg Output Voltage Drop
Non-Turbo
3.94 .3-.5
7.87 .7-.9
11.81 1.1-1.3
15.75 1.5-1.7
19.69 1.9-2.1
Turbo
3.94 .15-.35
7.87 .40-.60
11.81 .65-.85
15.75 .90-1.10
19.69 1.15-1.35
Fig 1: Measuring MAP Sensor Supply Voltage (Similar)
G94A45906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Measuring MAP Sensor Output Voltage (Non-Turbo M/T)
G94B45907Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Measuring MAP Sensor Output Voltage (Non-Turbo A/T)
G94C45908Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Measuring MAP Sensor Output Voltage (Turbo)
G94D45909Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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