2008 - MX-5 - Engine

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 HOW TO USE THIS MANUAL.)

1. Connect the M-MDS to the DLC‐2.

2. Turn the ignition switch to the ON position (Engine off).

3. Select MAP PID on the M-MDS.

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. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REMOVAL/INSTALLATION [LF].)

• 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. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR REMOVAL/INSTALLATION [LF].)

Circuit Open/Short Inspection

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

2. Inspect the following 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.