Absolute Pressure Sensor: Testing and Inspection

COMPONENT INSPECTION
Absolute Pressure Sensor
1. Start engine and warm it up sufficiently.
2. Perform "MAP/BARO SW/V" in "ACTIVE TEST" mode with CONSULT.
3. Check the following.




- When "MAP" is selected, "ABSOL PRES/SE" indicates approximately 1.3V.




- When "BARO" is selected, "ABSOL PRES/SE" indicates approximately 4.3V.
4. If NG, check MAP/BARO switch solenoid valve.
(1) Turn ignition switch "OFF".
(2) Remove MAP/BARO switch solenoid valve.
(3) Check air passage continuity.




Condition / Air passage continuity between (A) and (B) / Air passage continuity between (A) and (C)
12V direct current supply between terminals (1) and (2) / Yes / No
No supply / No / Yes

(4) If NG, replace MAP/BARO switch solenoid valve; if OK, go to step 5.
5. Remove absolute pressure sensor with its harness connector connected.
6. Remove hose from absolute pressure sensor.
7. Turn ignition switch "ON" and check output voltage between terminal 2 and engine ground.

The voltage should be 3.2 to 4.8 V.




8. Use pump to apply vacuum of -26.7 kPa (-200 mmHg, -7.87 inHg, -3.87 psi) to absolute pressure sensor as shown in figure and check the output voltage.

The voltage should be 1.0 to 1.4 V lower than the value measured in step 3.

CAUTION: Always calibrate the vacuum pump gauge when using it.

9. If NG, replace absolute pressure sensor.