P1105

SYSTEM DESCRIPTION
This system provides the absolute pressure sensor with either ambient barometric pressure or intake manifold pressure for monitoring.
The MAP/BARO switch solenoid valve switches between two passages (one is from the air duct, the other is from the intake manifold) by ON-OFF operation. When the MAP/BARO switch solenoid valve is activated ON or OFF by the ECM, either ambient barometric pressure or intake manifold pressure is applied to the absolute pressure sensor.
The solenoid valve is almost always OFF under normal conditions. When the following conditions are met, the solenoid valve is activated to switch ON for 1 second.

Solenoid / Conditions
ON
- Immediately after starting engine
or
- More than 5 minutes after the solenoid valve shuts OFF.
and
- Throttle valve is shut or almost fully shut for more than 5 seconds
and
- Vehicle speed is less than 100 km/h (62 MPH).




COMPONENT DESCRIPTION
The MAP/BARO switch solenoid valve switches between ambient barometric pressure and intake manifold pressure according to the voltage signal sent from the ECM. When the MAP/BARO switch solenoid valve is supplied with a voltage by the ECM, it turns "ON" so that the MAP/BARO switch solenoid valve monitors the ambient barometric pressure. When the MAP/BARO switch solenoid valve is not supplied the voltage, it goes "OFF" and the sensor monitors the intake manifold pressure.




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




ECM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values, and are measured between each terminal and (25) (ECCS ground) with a voltmeter.




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
With Consult
(1) Start engine and warm it up sufficiently.
(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 6 minutes.

OR

With GST
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 5 seconds.
(3) Start engine and let it idle.
(4) Wait at least 6 minutes.
(5) Select "MODE 7" with GST.

OR

No Tools
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 5 seconds.
(3) Start engine and let it idle.
(4) Wait at least 6 minutes.
(5) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(6) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

EC-SW/V-01 Manifold Absolute Pressure (MAP)/Barometric Pressure (BARO) Switch Solenoid Valve (DTC: P1105):

WIRING DIAGRAM







DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
With Consult
1. Start engine and warm it up sufficiently.

2. Perform "MAP/BARO SW/V" in "ACTIVE TEST" mode with CONSULT.
3. Make sure of the following.




- When selecting "MAP", "ABSOL PRES/SE" indicates approximately 1 .3V.




- When selecting "BARO", "ABSOL PRES/SE" indicates approximately 4.3V.
4. If NG, check solenoid valve below.

OR

WITHOUT CONSULT
1. Remove MAP/BARO switch solenoid valve.




2. Check air passage continuity.




3. If NG, replace solenoid valve.