Manifold Absolute Pressure (Map) Sensor
- The MAP sensor is located on firewall. With ignition on, check supply voltage from ECM to MAP sensor on designated wire terminal. See MAP SENSOR WIRE TERMINAL IDENTIFICATION table. Reading should be approximately 5 volts.
- Disconnect vacuum hose at MAP sensor, and install hand-held vacuum pump. Turn ignition on. Check signal voltage at designated wire terminal of MAP sensor. See MAP SENSOR WIRE TERMINAL IDENTIFICATION table.
- Apply vacuum and note change in signal voltage. As vacuum reading changes, signal voltage should change. Reading should vary from approximately 1 to 1 1/2 volts at high vacuum (idle position) to 4 to 4 1/2 volts at low vacuum (full throttle position).
MAP SENSOR WIRE TERMINAL IDENTIFICATION
| Application | Wire Color |
|---|---|
| Supply Voltage | Gray/Red |
| Signal Voltage | Gray/Green |