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Manifold Pressure/Vacuum Sensor: Testing and Inspection

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION

NOTE:
- Perform the following inspection only when directed
- The following vacuum values are indicated by relative pressure from the MAP sensor

1. Connect the WDS or equivalent to the DLC-2
2. Turn the ignition switch to ON (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 barometric pressure sensor.

Circuit Open/Short Inspection

1. Disconnect the PCM connector (See PCM REMOVAL/INSTALLATION.)




2. Inspect the following wiring harnesses for open or short circuit (Continuity check).

Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness
- MAP sensor terminal A (harness-side) and PCM terminal 2H
- MAP sensor terminal D (harness-side) and PCM terminal 1J
- MAP sensor terminal C (harness-side) and PCM terminal 2K

Short circuit
- If there is continuity, there is a short circuit Repair or replace the wiring harness
- MAP sensor terminal C (harness-side) and power supply.
- MAP sensor terminal C (harness-side) and body GND.
- MAP sensor terminal D (harness-side) and power supply.
- MAP sensor terminal D (harness-side) and body GND.
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