INTAKE AND EXHAUST -
On-vehicle Service
15-4
ON-VEHICLE SERVICE
TURBOCHARGER SUPERCHARGING CHECK
Caution
Conduct the driving test in a location where driving at
full acceleration can be done with safety. Two person
should be in the vehicle when the test is conducted; the
person in the passenger seat should read the indications
shown by the MUT-
II.
1. Set the vehicle to the pre-inspection condition.
2. Turn the ignition switch to “LOCK” (OFF) position, and
connect the diagnosis connector to the MUT-
II
.
3. Use the data list function named “Item No. 04” boost
pressure sensor of the MUT-
II
to check the supercharging
pressure when the engine speed increases to
approximately 3,000 r/min or more by driving at full
acceleration in 2nd.
4. When the indicated supercharger does not become
positive pressure, check the following items.
D
Malfunction of the boost pressure sensor
D
Leakage of supercharging pressure
D
Malfunction of the turbocharger
5. When the indicated supercharger is 133 kPa or more,
supercharging control may be faulty, therefore check the
followings.
D
Malfunction of the variable geometry actuator
D
Malfunction of the variable nozzle
D
Malfunction of the variable geometry solenoid valve
D
Malfunction of the boost pressure sensor
D
Malfunction of the variable geometry control pressure
sensor
SUPERCHARGING PRESSURE CONTROL
SYSTEM CHECK
1. Set the vehicle to the pre-inspection condition.
2. Turn the ignition switch to “LOCK” (OFF) position, and
connect the diagnosis connector to the MUT-
II
.
3. Start the engine, and let it run at idle.
4. Select the actuator testing function named “Item No. 35
or No. 36” of the MUT-
II
to check that the variable geometry
actuator vacuum and the supercharging pressure increase
when the variable geometry solenoid valve is activated.
Variable geometry
solenoid valve con-
dition
Variable
geometry
actuator vacuum
Supercharging
pressure
OFF
0 kPa
Approximately -1
kPa
ON
Approximately
80
kPa
Approximately
3
kPa
