15-6
1. Measurement and Adjustment of Turbocharger Boost Pressure
• If boost pressure exceeds the standard value, the engine may malfunction or break down. Boost pressure
must be within the specified range.
Service standards
1.1 Preparation
• Shift the transmission to neutral.
• Hold the steering wheel in neutral position.
• Turn off lamps and accessory devices not to increase the engine
speed.
• Connect the Multi-Use Tester. (See Gr00.)
• If any fault exists (corresponding diagnosis code is issued), recti-
fy it.
• Warm up the engine until the engine coolant has been heated to
more than 60C. (Determine coolant temperature from service
data [32: Water temperature].)
• Check that the non-load minimum speed (idling speed) is as
specified. (See Gr13.)
1.2 Measurement and correction of boost pressure
• Set the diagnosis switch to OFF (disconnect the fuse).
(See Gr00.)
• Turn the idle adjust dial to any position within the illustrated
range of Mode 1.
• Select [A4: VGT1] in [Actuator Test] of the Multi-Use Tester. Set
[Target Value] to 80% and execute.
• When [A4: VGT1] is executed, the engine speed should be auto-
matically increased to 2500 rpm.
• Maintain the state of [Target Value] having been executed (for 5
to 15 minutes) until boost pressure is stabilized.
• Measure the following items from among [Service Data].
20: Atmospheric pressure (measured atmospheric pressure)
21: Boost pressure (measured boost pressure)
30: Intake air temperature (upper stream) (measured air temper-
ature)
After the measurements, set the diagnosis switch to ON (con-
nect the fuse).
• Obtain boost pressure correction value respectively by calculat-
ing above Service Data.
[Calculation of intake air temperature correction value]
Intake air temperature correction value = –0.3976 (Measured
boost temperature –25)
[Calculation of atmospheric pressure correction value]
Atmospheric temperature correction value = Measured atmo-
spheric temperature –100
Location Maintenance item Standard value Limit Remedy
– Boost pressure 147 to 185 kPa – Inspect or adjust
ON-VEHICLE INSPECTION AND ADJUSTMENT
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