This sensor measures the change of pressure in the intake manifold. This sensor measures the changes in the intake manifold pressure which result from engine load and speed changes, and converts to a voltage output that is monitored by the PCM.
Removal & Installation
- Disconnect the negative battery cable.
- Disconnect the connector from the sensor.
- Remove the sensor retaining screws.
- Remove the sensor from its mounting.
- Installation is the reverse of the removal procedure.
- Turn the ignition switch ON.
- Using a voltmeter, measure the voltage between terminal 1 (sensor output) and terminal 4 (sensor ground).
- Specification should be 4-5 volts. At idle specification should be 0.8-2.4 volts.
- If not within specification, replace the sensor.
- Connect the scan tool.
- Be sure the ignition is OFF.
- Remove the MAP sensor and connect MAP sensor connector.
- Turn the ignition ON, engine OFF.
- Using a hand held vacuum pump, apply vacuum and measure the -MAP SENSOR- parameter on the scan tool.
Specification should be as follows:
Applied vacuum 1.45 psi, output voltage 0.06 volt
- If not within specification substitute a known good sensor and recheck for proper operation. Replace defective components as required.
- If within specification, check the PCM as follows, ignition OFF. Disconnect the sensor connector. Connect the scan tool. Turn the ignition ON and engine OFF. Select simulation function on the scan tool. Simulate voltage at terminal 1 of the sensor connector.
- If the signal voltage value does not change, substitute a known good PCM and repeat the test. Replace the PCM as required. If the signal voltage value does change, check connectors for looseness, poor connection, binding etc. Correct and retest.