- Turn the ignition switch ON.
- Using a voltmeter, measure the voltage between terminal 1 (sensor output) and terminal 4 (sensor ground).
- Specification should be more than 4 volts. At idle specification should be less than 2.5 volts.
- If not within specification, replace the sensor.
- Be sure the ignition is OFF. Connect the scan tool.
- Connect a probe to the MAPS and TPS to check the signal waveform, by using oscilloscope function.
- Engine ON, and monitor signal waveform during acceleration and deceleration.
Specification should be as follows:
Pressure 20 kpa, voltage 0.789
- If not within specification substitute a known good sensor and recheck for proper operation. Replace the sensor, if required.
- If within specification, check the PCM as follows, ignition OFF. 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 harness 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.
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.