Suzuki Wagon R Manual page 1587

7B-20 AUTOMATIC TRANSMISSION (4 A/T)
Time lag test
This test is to check conditions of clutch, reverse brake and fluid
pressure. "Time lag" means time elapsed since select lever is
shifted with engine idling till shock is felt.
1) With chocks placed in front and behind front and rear wheels
respectively, depress brake pedal.
2) Start engine.
3) With stop watch ready, shift select lever from "N" to "D" range
and measure time from that moment till shock is felt.
4) Similarly measure time lag by shifting select lever from "N" to
"R" range.
Specification for time lag
"N" → "D" : Less than 1.0 sec.
"N" → "R" : Less than 1.2 sec.
NOTE:
• Make sure that selector cable is properly adjusted.
• When repeating this test, be sure to wait at least
minute after select lever is shifted back to "N" range.
• Engine should be warmed up fully for this test.
Test result
When "N" → "D"
time lag exceeds specification.
When "N" → "R"
time lag exceeds specification.
Possible cause
• Low line pressure
• Worn rear clutch
• Worn 1st & 2nd brake
• Low line pressure
• Worn rear clutch
• Worn direct clutch
• Worn reverse brake