Stall Test - Suzuki GRAND VITARA XL-7 Owner's Manual

7B1-38 AUTOMATIC TRANSMISSION (4 A/T)

Stall Test

This test is to check overall performance of automatic transmission and engine by measuring stall speed at "D"
and "R" ranges. Be sure to perform this test only when transmission 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, for fluid temperature may rise exces-
sively high.
• After performing stall test, be sure to leave engine running at idle for longer than 30 seconds before
another stall test.
1) Apply parking brake and block wheels.
2) Install tachometer.
3) Start engine with select lever shifted to "P".
4) Depress brake pedal fully.
5) Shift select lever to "D" 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.
Stall speed :
2,460 – 2,760 r/min.
TROUBLESHOOTING
Lower than standard level
Higher than standard level in "D" range
Higher than standard level in "R" range
Condition Possible cause
• Faulty engine output
• Defective torque converter
• Slippery O/D clutch
• Slippery forward clutch
• Malfunctioning O/D one-way clutch
• Malfunctioning one-way clutch No. 2
• Low line pressure
• Slippery direct clutch
• Slippery reverse brake
• Low fluid pressure
• Slippery O/D clutch
• Defective O/D one-way clutch