See Figure 1
The Manifold Absolute Pressure (MAP) sensor measures manifold vacuum using a frequency. This gives the ECU information on engine load. It is used as a barometric sensor for altitude adjustment of the air/fuel ratio.
See Figure 1
- Check the MAP sensor connection.
- Inspect the terminals within the connector for corrosion or points of high resistance.
- Repair or replace as necessary.
- If code three is detected, an electrical problem in the system may be present.
- Remove the electrical connector from the map sensor.
- Turn the ignition key to the ON position.
- On the Integra, connect the positive lead of a voltmeter to the yellow/red wire
- On the Legend, connect the positive lead of the voltmeter to the yellow/white wire.
- Connect the negative probe to the green/white wire in the harness. Do not probe the MAP sensor side.
- With the voltmeter connected properly, you should see a voltage of five volts.
- On the Integra, probe the white wire; a five volt signal should be seen.
- On the Legend, probe the red wire for a five volt reference signal.
- If no voltage is detected, and all of the wiring is also OK, the Powertrain Control Module (PCM) may be faulty.
- If the connector does have five volts going to it, reconnect it to the MAP sensor.
- Backprobe the weather pack connector. There should be about three volts to the sensor.
- If there are three volts, the PCM may be at fault.
- If the sensor voltage is high or low, the sensor is the cause.
- Turn the ignition to the OFF position and perform the repair.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Disconnect the MAP sensor vacuum lines.
- Remove the mounting screws from the MAP sensor.
- Remove the MAP sensor.
- Installation is the reverse of the removal procedure.