Manual Road Test; Time Lag Test - Suzuki sq-416-420-625 Service Manual

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1. Shift solenoids connector

MANUAL ROAD TEST

This test check the gear being used in "L", "2" or "D" range when
driven with unoperated gear shift control system. Test drive vehicle
on a level road.
NOTE:
Before this test, check diagnostic trouble code (DTC).
1) Disconnect coupler of shift solenoid valves on transmission.
WARNING:
To avoid the danger of being burned, do not touch the hot
exhaust system when disconnecting shift solenoid
valves coupler.
2) With select lever in "P", start engine and warm it up.
3) With select lever in "L" range, start vehicle and accelerate to 20
km/h (12.5 mile/h). Check in this state that 1st gear is being
used.
4) At 20 km/h (12.5 mile/h), shift select lever to 2 range and acceler-
ate to 40 km/h (25 mile/h). Check in this state that 3rd gear is
being used.
5) At 40 km/h (25 mile/h), shift select lever to D range and check
that O/D gear is used when speed is higher than 40 km/h (25
mile/h).
6) After above checks, stop vehicle then engine, and connect shift
solenoids coupler with ignition switch OFF.
WARNING:
To avoid the danger of being burned, do not touch the hot
exhaust system when connecting shift solenoid valves
coupler.
7) Clear DTC with scan tool.

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 before and behind front and rear wheels re-
spectively, 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
NOTE:
D When repeating this test, be sure to wait at least minute
after select lever is shifted back to "N" range.
D 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
AUTOMATIC TRANSMISSION (4 A / T) 7B1-57
"N"$"D" Less than 1.2 sec.
"N"$"R" Less than 1.5 sec.
Possible causes
D Low line pressure
D Worn forward clutch
D Low line pressure
D Worn direct clutch
D Worn reverse brake