ABSOL PRES/SE

COMPONENT DESCRIPTION
The absolute pressure sensor is connected to the MAP/BARO switch solenoid valve by a hose. The sensor detects ambient barometric pressure and intake manifold pressure respectively, and modifies the voltage signal received from the ECM. The modified signal will then be returned to the ECM. As the pressure increases, the voltage rises.






CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.






ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and (26) (ECCS ground).






ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If the 1st trip DTC cannot be confirmed, perform "Procedure for malfunction B". If the 1st trip DTC is not confirmed on "Procedure for malfunction B", perform "Procedure for malfunction C".



Procedure for malfunction A

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.






With CONSULT
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT.
(3) Wait at least 10 seconds.



Procedure for malfunction B

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.






With CONSULT
(1) Start engine and warm it up to normal operating temperature.
(2) Turn ignition switch "OFF" and wait at least 5 seconds.
(3) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
(4) Start engine and let it idle.
(5) Wait at least 15 seconds.



Procedure for malfunction C

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.









With CONSULT
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT. The voltage of "ABSOL PREC/SE" should be more than 1.74 [V].
If the check result is NG, go to "DIAGNOSTIC PROCEDURE".
If the check result is OK, go to following step.
(3) Start engine and warm it up to normal operating temperature.
(4) Turn ignition switch "OFF" and wait at least 5 seconds.
(5) Start engine and let it idle for at least 15 seconds.
(6) Select "DATA MONITOR" mode with CONSULT.
(7) Drive the vehicle at least 3 consecutive seconds under the following conditions,
B/FUEL SCHDL: More than 5.2 ms
CKPS.RPM (POS): 3,000 - 4,800 rpm
Selector lever: Suitable position
Driving pattern: Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.






Circuit Connectors






Electrical Diagrams


DIAGNOSTIC PROCEDURE
If the trouble is duplicated after "Procedure for malfunction A or B", perform "Procedure A". If the trouble is duplicated after "Procedure for malfunction C", perform "Procedure B".









Procedure A






Procedure B



COMPONENT INSPECTION








Absolute pressure sensor
1. Remove absolute pressure sensor from bracket with its harness connector connected.
2. Remove hose from absolute pressure sensor.
3. Turn ignition switch "ON".
4. Apply vacuum and barometric pressure to absolute pressure sensor as shown in figure.
5. Check output voltage between ECM terminal (61) and (25) (ECM ground).

CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) and over 101.3 kPa (760 mmHg, 29.92 inHg) of pressure.

6. If NG, replace absolute pressure sensor.










MAP/BARO switch solenoid valve
1. Remove MAP/BARO switch solenoid valve.
2. Check air passage continuity.
3. Check the time required for the solenoid valve to switch. It should be less than 1 second.
4. If NG, replace MAP/BARO switch solenoid valve.