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.
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
Specification data are reference values.
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and (25) (ECM 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 10 seconds before conducting the next test.
Procedure malfunction A
TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
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.
4. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".
OR
With Generic Scan Tools
1. Start engine and let it idle.
2. Wait at least 10 seconds.
3. Select "MODE 7" with GST.
4. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".
OR
Without Scan Tools
1. Start engine and let it idle.
2. Wait at least 10 seconds.
3. Turn ignition switch "OFF", wait at least 10 seconds and then turn "ON".
4. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
5. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".
Procedure for malfunction B
TESTING CONDITION: Always perform the test at a temperature of 5 °C (41 °F) or higher.
With Consult
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 10 seconds.
3. Turn ignition switch "ON" again and select "DATA MONITOR" mode with CONSULT.
4. Make sure that "FUEL TEMP SEN" is more than 0 °C (320 °F).
5. Start engine and let it idle for at least 10 seconds.
6. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".
OR
With Generic Scan Tools
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 10 seconds.
3. Turn ignition switch "ON".
4. Check that voltage between ECM terminal (52) and ground is less than 4.2 V.
5. Start engine and let it idle for at least 10 seconds.
6. Select "MODE 7" with GST.
7. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".
OR
Without Scan Tools
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 10 seconds.
3. Turn ignition switch "ON".
4. Check that voltage between ECM terminal (52) and ground is less than 4.2 V.
5. Start engine and let it idle for at least 10 seconds.
6. Turn ignition switch "OFF", wait at least 10 seconds and then turn "ON".
7. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
8. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".
WIRING DIAGRAM
Procedure A
Part 1 Of 2:
Part 2 Of 2:
Procedure B
DIAGNOSTIC PROCEDURE
If the trouble is duplicated after "Procedure for malfunction A", perform "Procedure A" below. It the trouble is duplicated after "Procedure for malfunction B", perform "Procedure B".
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, check solenoid valve as shown below.
OR
Without Consult
1. Turn ignition switch "OFF" and 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 or operation takes more than 1 second, replace solenoid valve.