Stall Test - Suzuki SX4 Service Manual

5A-32 Automatic Transmission/Transaxle:

Stall Test

This test is to check overall performance of automatic transaxle and engine by measuring stall speed at "D" and "R"
ranges. Be sure to perform this test only when transaxle fluid is at normal operating temperature and its level is
between FULL and LOW marks.
CAUTION
!
• Do not run engine at stall more than 5 seconds continuously, or fluid temperature may rise
excessively high.
• After performing stall test, be sure to leave engine running at idle for longer than 1 minute before
another stall test.
1) Apply parking brake and block wheels.
2) Install tachometer.
3) Start engine with select lever shifted to "P" range.
4) Depress brake pedal fully.
5) Shift select lever to "D" range and depress accelerator pedal fully while watching tachometer. Read engine rpm
quickly when it has become constant (stall speed).
6) Release accelerator pedal immediately after stall speed is checked.
7) In the same way, check stall speed in "R" range.
8) Stall speed should be within the following specification.
Engine stall speed
Standard: 2,200 – 2,600 rpm
Troubleshooting
Condition
Lower than standard level
in both "D" and "R" range
Higher than standard
level in "D" range
Higher than standard
level in "R" range
Higher than standard
level in both "D" and "R"
range
Possible cause
Engine output torque failure
Faulty one-way clutch of torque
converter
Malfunction of pressure control solenoid
valve (Low line pressure)
Faulty valve body component
Slippery forward clutch
Faulty one-way No.2 clutch
Leakage from "D" range fluid pressure
circuit
Malfunction of pressure control solenoid
valve (Low line pressure)
Faulty valve body component
Slippery reverse clutch
Slippery 1st and reverse brake
Leakage from "R" range fluid pressure
circuit
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
Correction / Reference Item
Inspect and repair engine.
Replace torque converter.
Inspect. If NG, replace valve body assembly.
Replace valve body assembly.
Inspect. If NG, replace.
Inspect. If NG, replace.
Overhaul or replace valve body assembly.
Inspect. If NG, replace valve body assembly.
Replace valve body assembly.
Inspect. If NG, replace.
Inspect. If NG, replace.
Overhaul or 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.
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