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. Voltage 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.
- As vacuum reading changes, voltage should change. Reading should vary from approximately 1 to 1 1/2 volts at high vacuum and to 4 to 4 1/2 volts at low vacuum. Reading should change evenly as vacuum changes and will vary with altitude. See MAP SENSOR VOLTAGE SPECIFICATIONS table.
MAP SENSOR WIRE TERMINAL IDENTIFICATION
| Application | Supply Voltage Wire Color | Signal Voltage Wire Color |
|---|---|---|
| Metro | Light Green | Light Green/Red |
MAP SENSOR VOLTAGE SPECIFICATIONS
| Altitude Feet (Meters) | Signal Voltage |
|---|---|
| Below 1,000 (304) | 3.8-5.5 |
| 1,000-2,000 (304-610) | 3.6-5.3 |
| 2,000-3,000 (610-914) | 3.5-5.1 |
| 3,000-4,000 (914-1219) | 3.3-5.0 |
| 4,000-5,000 (1219-1524) | 3.2-5.8 |
| 5,000-6,000 (1524-1829) | 3.0-4.6 |
| 6,000-7,000 (1829-2133) | 2.9-4.5 |
| 7,000-8,000 (2133-2438) | 2.8-4.3 |
| 8,000-9,000 (2438-2473) | 2.6-4.2 |
| 9,000-10,000 (2473-3048) | 2.5-4.0 |