Toyota Supra 1990 Manual page 142

TC-8
SST
TURBOCHARGER SYSTEM - Turbocharger
EM3529
(g) Disconnect the actuator hose.
(h) Using SST (turbocharger pressure gauge), apply ap-
prox. 0.52 kg/cm2 (7.4 psi, 51 kPa) of pressure to
the actuator and check that the rod moves.
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If the rod does not move, replace the turbocharger as-
sembly.
NOTICE: Never apply more than 0.8 kg/cm2 (11.4 psi
78 kPa) of pressure to the actuator.
4. CHECK TURBOCHARGING PRESSURE
(a) Install SST (turbocharger pressure gauge) to the pres-
sure regulator with a three way.
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(b)
(MIT
models)
Accelerate the vehicle with the throttle valve fully
open after driving at 3-speed at 1,000 rpm.
Measure the turbocharging pressure when the engine
speed is over 2,500 rpm.
Standard pressure: 0.39 - 0.53 kg/cm2
(5.5 - 7.5 psi, 38 - 52 kPa)
(c) (A/T models)
From a stationary state accelerate the vehicle in "L"
range with the throttle valve fully open. Measure the
turbochargining pressure when the engine speed is
over 3,500 rpm.
Standard pressure: 0.34 - 0.42 kg/cm2
(4.8 - 6.0 psi, 33 - 41 kPa)
If the pressure is less than that specified, check the intake
air and exhaust systems for leakage. If there is no leakage,
replace the turbocharger assembly.
If the pressure is above specification, check if the actuator
hose is disconnected or cracked. If not, replace the tur-
bocharger assembly.
5. INSPECT IMPELLER WHEEL ROTATION
Grasp the edge of the impeller wheel and turn it.
Check that it turns smoothly.
If it does not turn or if it turns with a drag, replace the tur-
bocharger assembly.