Manifold Absolute Pressure (Map) Sensor

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 articles listed below:

Paseo, see: WIRING DIAGRAMS

Tercel, see: WIRING DIAGRAMS

MAP SENSOR LOCATIONS

Application	Location
Paseo & Tercel	In Engine Compartment, On Center Of Firewall

The MAP sensor may also be referred to as a vacuum sensor. Ensure ignition is off. To check MAP sensor supply voltage, disconnect electrical connector from MAP sensor. See MAP SENSOR LOCATIONS table.
Turn ignition on. Using voltmeter, measure voltage between terminals VC or VCC and E2 of electrical connector on wiring harness. 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.
If supply voltage is not within specification, check wiring circuit. See appropriate wiring diagram in articles listed below:
- Paseo, see: WIRING DIAGRAMS
- Tercel, see: WIRING DIAGRAMS
  If supply voltage is correct, turn ignition off. Reinstall electrical connector on MAP sensor.
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).

MAP SENSOR SUPPLY VOLTAGE SPECIFICATIONS

Application	Voltage
Paseo & Tercel	4.00-6.00

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