AUTOMATIC TRANSMISSION (4 A/T) 7B-21
Line pressure test
Purpose of this test is to check operating conditions of each part
by measuring fluid pressure in fluid pressure line.
Line pressure test requires following conditions.
• Automatic fluid is at normal operating temperature (70 –
80°C /158 – 176°F).
• Fluid is filled to proper level (between FULL and LOW on dip-
stick).
1) Apply parking brake securely and place chocks against
wheels.
2) Remove fluid pressure check hole plug bolt.
3) Attach oil pressure gauge to fluid pressure check hole in
transmission case.
Special tool
(A) : 09925-37811-001
4) Depress foot brake fully, run engine at idle and stall then check fluid pressure in “D” or “R” range.
Line pressure
CAUTION:
After attaching oil pressure gauge, check that no fluid
leakage exists.
(A)
CAUTION:
Do not continue running engine at stall speed longer than 5 seconds.
“D” range “R” range
At idle speed
7.6 – 9.2 kg/cm
2
108.1 – 130.8 psi
14.1 – 17.3 kg/cm
2
200.6 – 246.0 psi
At stall speed
7.9 – 9.5 kg/cm
2
112.4 – 135.0 psi
14.4 – 17.6 kg/cm
2
204.8 – 250.2 psi
Test result Possible cause
Line pressure higher than stan-
dard level in each range
• Malfunctioning regulator valve
Line pressure lower than standard
level in each rang
• Malfunctioning regulator valve
• Defective oil pump
Line pressure lower than standard
level only in “D” range
• Fluid leakage from “D” range pressure circuit
• Fluid leakage from 1st & 2nd brake
• Fluid leakage from rear clutch
Line pressure lower than standard
level only in “R” range
• Fluid leakage from “R” range pressure circuit
• Fluid leakage from rear clutch
• Fluid leakage from direct clutch
• Fluid leakage from reverse brake
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