AUTOMATIC TRANSMISSION (3 A / T) (VEHICLE WITH WU-TWC) 7B-31
TABLE A-2 GEAR CHANGE FAILURE
STEP ACTION YES NO
1 Was “AUTOMATIC TRANSMISSION DIAGNOSTIC
FLOW TABLE” performed?
Go to Step 2. Go to “AUTOMATIC
TRANSMISSION
DIAGNOSTIC FLOW
TABLE”.
2 Disconnect solenoid valve wire coupler and perform
manual road test.
Is upshift from 1st to 2nd possible?
Go to Step 3. 1-2 shift valve sticks
or Shift solenoid-B
(2nd brake solenoid)
valve sticks.
3 Is upshift from 2nd to 3rd possible? Gear shift control
system defective.
Go to A/T Diagnostic
Flow Table B.
2-3 shift valve sticks
or Shift solenoid-A
(Direct clutch
solenoid) valve
sticks.
TABLE A-3 EXCESSIVE SHOCK AT RANGE SELECTION OR GEAR CHANGE
STEP ACTION YES NO
1 Was “AUTOMATIC TRANSMISSION DIAGNOSTIC
FLOW TABLE” performed?
Go to Step 2. Go to “AUTOMATIC
TRANSMISSION
DIAGNOSTIC FLOW
TABLE”.
2 Is line pressure proper? Go to Step 3. Regulator valve
defective, Throttle
valve defective or
Accelerator cable
maladjusted.
3 Does excessive shock occur when selecting “D” range
from “N” range?
Forward clutch
accumulator
operation failure,
Forward clutch worn
or Forward clutch oil
circuit check ball
operation failure.
Go to Step 4.
4 Does excessive shock occur when selecting “R” range
from “N” range?
1st-Reverse brake
worn, 1st-Reverse
brake oil circuit check
ball operation failure.
Go to Step 5.
5 Does excessive shock occur at 1st to 2nd gear
change?
2nd brake
accumulator
defective, 2nd brake
worn, 2nd brake oil
circuit check ball
operation failure.
In case of excessive
shock at 2nd to 3rd
gear change, Direct
clutch worn or Direct
clutch oil circuit check
ball operation failure.
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