P1105

SYSTEM DESCRIPTION
This system allows the absolute pressure sensor to monitor either ambient barometric pressure or intake manifold pressure. The MAP/BARO switch solenoid valve switches between two passages by ON-OFF pulse signals from the ECM. (One passage is from the intake air duct, the other is from the intake manifold.) Either ambient barometric pressure or intake manifold pressure is applied to the absolute pressure sensor.




COMPONENT DESCRIPTION
The MAP/BARO switch solenoid valve switches its air flow passage according to the voltage signal sent from the ECM. When voltage is supplied from the ECM, the MAP/BARO switch solenoid turns "ON". Then, the absolute pressure sensor can monitor the ambient barometric pressure. When voltage is not supplied from the ECM, the MAP/BARO switch solenoid valve turns "OFF". Then, the sensor monitors intake manifold pressure.




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 (43) (ECCS ground).




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

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.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V.




With Consult
1) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
2) Start engine and let it idle.
3) Wait at least 10 seconds.

OR

With Generic Scan Tool
1) Slant engine and let it idle.
2) Wait at least 10 seconds.
3) Select "MODE 7" with GST.

Without Scan Tools
1) Start engine and let it idle.
2) Wait at least 10 seconds.
3) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
4) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.







DIAGNOSTIC PROCEDURE




WIRING DIAGRAM

COMPONENT INSPECTION
MAP/BARO switch solenoid valve







With Consult
1. Start engine and warm it up to normal operating temperature.
2. Perform "MAP/BARO SW/V" in "ACTIVE TEST" mode with CONSULT.
3. Check the following.
- Condition: At idle under no-load
- CONSULT display
- Time for voltage to change.







4. If NG, replace solenoid valve.

OR







Without Consult
1. Remove MAP/BARO switch solenoid valve.
2. Check air passage continuity.
3. If NG, replace solenoid valve.