Manifold Pressure/Vacuum Sensor: Testing and Inspection

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [LF]

NOTE: Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See Troubleshooting Procedure.)




1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to the ON position (Engine off).
3. Select MAP PID on the WDS or equivalent.
4. Verify that the MAP PID (pressure) and barometric pressure are practically equal.
- If not as verified, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace the MAP sensor.
- If as verified, go to next step.

5. Apply vacuum of -25.0 kPa {-187 mmHg, -7.38 inHg} to the MAP sensor, and verify that the MAP variation from that of Step 4 is approx. 25.0 kPa {187 mmHg, 7.38 inHg}.
- If not as verified, perform the "Circuit Open/Short inspection".
- If there is no open or short circuit, replace the MAP sensor.

Circuit Open/Short Inspection

1. Disconnect the PCM connector.







2. Inspect the wiring harnesses for an open or short circuit. (Continuity Inspection)

Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- MAP/boost air temperature sensor terminal A and PCM terminal 2AV
- MAP/boost air temperature sensor terminal C and PCM terminal 2AU
- MAP/boost air temperature sensor terminal D and PCM terminal 2AG

Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- MAP/boost air temperature sensor terminal A and power supply
- MAP/boost air temperature sensor terminal C and body ground.
- MAP/boost air temperature sensor terminal D and power supply.
- MAP/boost air temperature sensor terminal D and body ground.