Line Pressure Test - Suzuki SX4 Service Manual

5A-34 Automatic Transmission/Transaxle:

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 the following conditions.
• Automatic fluid is at normal operating temperature (70 – 80 °C / 158 – 176 °F).
• Fluid is replenished to proper level (between FULL and LOW on dipstick).
• Air conditioner switch is turned OFF.
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 transaxle case.
Special tool
(A): 09925–37811–001
CAUTION
!
After attaching oil pressure gauge, check that no fluid leakage exists.
4) Depress foot brake fully, run engine at idle and stall then check fluid pressure in "D" or "R" range.
CAUTION
!
• Do not continue running engine at stall speed longer than 5 seconds.
• After performing line pressure test, be sure to leave engine running at idle for longer than one
minute before performing another line pressure test.
Automatic transaxle line pressure
"D" range
At idle 3.7 – 4.1 kg/cm
speed 53 – 58psi
At stall 12.5 – 13.7 kg/cm
speed
178 – 195 psi
Troubleshooting
Condition
Higher than standard
level in each range
Lower than standard level
in each range
Lower than standard level
only in "D" range
Lower than standard level
only in "R" range
"R" range
2 , 5.9 – 6.8 kg/cm 2 ,
84 – 97 psi
2 , 16.5 – 19.0 kg/cm
235 – 270 psi
Possible cause
Malfunction of pressure control solenoid
valve (Low line pressure)
Faulty valve body component
Malfunction of pressure control solenoid
valve (Low line pressure)
Faulty valve body component
Clogged oil strainer
Faulty oil pump
Leakage from both "D" and "R" range
fluid pressure circuit
Leakage from "D" range fluid pressure
circuit
Leakage from "R" range fluid pressure
circuit
2 ,
Inspect. If NG, replace valve body assembly.
Replace valve body assembly.
Inspect. If NG, replace valve body assembly.
Replace valve body assembly.
Replace.
Inspect. If NG, replace.
Overhaul or replace valve body assembly.
Overhaul or replace valve body assembly.
Overhaul or replace valve body assembly.
Correction / Reference Item
S7RW0A5104016