Manifold Absolute Pressure (Map) Sensor
- Ensure ignition is off. To check MAP sensor supply voltage, disconnect electrical connector from MAP sensor. See MAP SENSOR LOCATION 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 LOCATION
Application Location RAV4 In Engine Compartment, On Center Of Firewall - Turn ignition on. Using voltmeter, check MAP sensor supply voltage between terminals E2 and VC or VCC on wiring harness side of electrical connector for MAP sensor. See Fig 1. The E2 and VC or VCC terminals are the 2 outer terminals. DO NOT use the center terminal.
- The MAP sensor supply voltage should be 4.5-5.5 volts. If MAP sensor supply voltage is not within specification, check wiring circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. If MAP sensor supply voltage is within specification, turn ignition off. Reinstall electrical connector on MAP sensor.
- To check MAP sensor output voltage, turn ignition on. Disconnect vacuum hose from MAP sensor. Connect voltmeter between terminals PIM and E2 on Engine Control Module (ECM). See Fig 2. See ECM LOCATION table. See TERMINAL & WIRE COLOR IDENTIFICATION table.ECM LOCATION
Model Location RAV4 Bottom Center Of Instrument Panel, In Front Of Console TERMINAL & WIRE COLOR IDENTIFICATIONTerminal Wire Color PIM Light Green/Red E2 Brown - Measure and record output voltage under ambient atmospheric pressure. Attach vacuum pump to MAP sensor.
- 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 |
|---|---|
| 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 |