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
Perform "Procedure for malfunction A" first. If the 1st trip DTC cannot be confirmed, perform "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.
Procedure for malfunction A
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V.
With Consult
(1) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT
(2) Wait at least 10 seconds.
OR
With Generic Scan Tool
(1) Turn ignition switch "ON" and wait at least 10 seconds.
(2) Select "MODE 7" with GST
OR
Without Scan Tools
(1) Turn ignition switch "ON" and wait at least 10 seconds.
(2) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(3) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
Procedure for malfunction B
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" again and select "DATA MONITOR" mode with CONSULT
(4) Make sure that "TANK/F/TEMP SE" is more than 0°C (32°F).
(5) Start engine and let it idle for at least 10 seconds.
OR
With Generic Scan Tool
(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".
(4) Check that voltage between ECM terminal (63) and ground is less than 4.2V.
(5) Start engine and let it idle for at least 10 seconds.
(6) Select "MODE 7" with GST
OR
Without Scan Tools
(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".
(4) Check that voltage between ECM terminal (63) and ground is less than 4.2V.
(5) Start engine and let it idle for at least 10 seconds.
(6) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(7) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
DIAGNOSTIC PROCEDURE
If the trouble is duplicated after "Procedure for malfunction A", perform "Procedure A" below. If the trouble is duplicated after "Procedure for malfunction B", perform "Procedure B" on next page.
Procedure A
PAGE REFERENCE:
Procedure B
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, check solenoid valve as shown.
Without Consult
1. Remove MAP/BARO switch solenoid valve.
2. Check air passage continuity.
3. If NG, replace solenoid valve.