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.
Solenoid Conditions
ON For 5 seconds after turning ignition switch ON (Engine is not running)
or
ON For 5 seconds after starting engine
or
ON More than 5 minutes after the solenoid valve shuts OFF
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 32 (ECM ground).
On Board Diagnosis Logic:
DTC Confirmation Procedure
Perform "PROCEDURE FOR MALFUNCTION A" first. If the 1st trip DTC cannot be confirmed, perform "PROCEDURE FOR MALFUNCTION B".
NOTE: If "DTC 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 at ignition switch "ON".
With CONSULT
1. Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
2. Wait at least 10 seconds.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
With GST
1. Turn ignition switch "ON" and wait at least 10 seconds.
2. Select "MODE 7" with GST.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
Without Scan Tool
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.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
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/TMP SE" is more than 0°C (32°F).
5. Start engine and let it idle for at least 10 seconds.
6. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
With GST
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 60 (Tank fuel temperature sensor signal) 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.
7. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
Without 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 60 (Tank fuel temperature sensor signal) 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.
8. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
EC-SW/V-01:
EC-SW/V-01 Connectors View:
Wiring Diagram
Diagnostic Procedure
If the trouble is duplicated after "PROCEDURE FOR MALFUNCTION A", perform "PROCEDURE A".
If the trouble is duplicated after "PROCEDURE FOR MALFUNCTION B", perform "PROCEDURE B".
PROCEDURE A
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
Step 6:
PROCEDURE B
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
Step 6:
Step 7:
Step 8:
Step 9:
Step 10:
Step 11:
Step 12:
Step 13:
Step 14:
Step 15:
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
MAP/BARO ABSOL PRES/SE (Voltage.
BARO More than 2.6V
MAP Less than the voltage at BARO
- Time for voltage to change
MAP/BARO SW/V Required time to switch
BARO to MAP Less than 1 second
MAP to BARO Less than 1 second
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 or operation takes more than 1 second, replace solenoid valve.