15-10
1. Measurement and Adjustment of Turbocharger Boost Pressure
Service standards
(1) Preparation
• Put the transmission in N range.
• Turn the steering wheel in neutral position.
• Turn off all lamps and accessories.
• Connect the Multi-Use Tester.
• Check diagnosis code of each electronic control system. If any
fault exists, rectify it.
• Warm up the engine until the engine coolant has been heated to
more than 60°C. (verify from Service Data “2E: Water Tempera-
ture”)
• Check that the non-load minimum speed (idling speed) is as
specified. (See Gr13.)
(2) Measurement and correction of boost pressure
• Turn the idle adjust dial to any position within the illustrated
range of Mode 1.
• Select [Engine Control] on the system select screen of the Multi-
Use Tester, then execute [BA: VGT Test] from [Actuator Tests].
• When [BA: VGT Test] is executed, the engine speed should be
automatically increased to 1600 rpm (No. 2 magnetic valve acti-
vated).
• Maintain the state of [BA: VGT Test] having been executed (for 5
to 15 minutes) until boost pressure is stabilized.
• Measure the following items from among [Service Data].
26: Boost pressure (actual boost pressure)
2B: Intake air temperature (actual intake air temperature)
30: Atmospheric pressure (actual atmospheric pressure)
• Obtain corrected boost pressure by calculating above Service
Data.
[Correction with intake air temperature]
Corrected boost pressure [kPa] = Measured boost pressure + 0.43
(measured intake air temperature - 25)
[Correction with boost temperature (Exhaust gas recirculation
temperature)]
Corrected boost pressure [kPa] = Measured boost pressure + 0.02
(measured boost temperature - 33)
[Correction with atmospheric pressure]
Corrected boost pressure [kPa] = Measured boost pressure -
(measured atmospheric pressure - 101.5)
• If corrected boost pressure in any case above deviates from the
standard value, adjust the turbocharger.
CAUTION
• If the adjusting range of the air cylinder shaft exceeds ±1.5
turns, check the turbocharger.
Location Maintenance item Standard value Limit Remedy
–
Boost pressure
(when VGT test performed with ambient temperature at
25°C and atmospheric pressure at 101.5 kPa)
157 ± 7 kPa – Adjust
ON-VEHICLE INSPECTION AND ADJUSTMENT
To Next Page
Loading...
