AT -36
AUTOMATIC TRANSAXLE (F4A51)
Trouble symptom
Probable cause
Shocks when changing from N to
R and large time lag
If abnormal shocks or a time lag of
2 seconds or more occur when the
selector lever is shifted from N to R
range while the engine is idling, the
cause is probably abnormal reverse
clutch pressure or low and reverse brake
pressure, or a malfunction of the reverse
clutch, low and reverse brake, valve
body or idle position switch.
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Abnormal reverse clutch pressure
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Abnormal low and reverse
brake pressure
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Malfunction of the low and reverse
solenoid valve
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Malfunction of the reverse clutch
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Malfunction of the low and
reverse brake
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Malfunction of the valve body
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Malfunction of the idle position switch
Malfunction when starting
Shocks when changing from N to D,
N to R and large time lag
If abnormal shocks or a time lag of 2
seconds or more occur when the selector
lever is shifted from N to D range and
from N to R range while the engine is
idling, the cause is probably abnormal
line pressure or a malfunction of the
oil pump or valve body.
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Abnormal line pressure
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Malfunction of the oil pump
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Malfunction of the valve body
Malfunction when shifting
Shocks and running up
If shocks occur when driving due to
up shifting or down shifting and the
transmission speed becomes higher than
the engine speed, the cause is probably
abnormal line pressure or a malfunction
of a solenoid valve, oil pump, valve
body or of a brake or clutch.
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Abnormal line pressure
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Malfunction of each solenoid valve
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Malfunction of the oil pump
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Malfunction of the valve body
-
Malfunction of each brake or
each clutch
All points
If all shift points are displaced while
driving, the cause is probably a
malfunction of the output shaft speed
sensor, TPS or of a solenoid valve.
-
Malfunction of the output shaft
speed sensor
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Malfunction of the throttle
position sensor
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Malfunction of each solenoid valve
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Abnormal line pressure
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Malfunction of the valve body
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Malfunction of the TCM(PCM)
Displaced shifting points
Some points
If some of the shift points are displaced
while driving, the cause is probably a
malfunction of the valve body, or it is
related to control and is not an abnormality.
-
Malfunction of the valve body
Does not shift
No diagnosis codes
If shifting does not occur while driving
and no diagnosis codes are output, the
cause is probably a malfunction of the
transaxle range switch, or TCM(PCM)
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Malfunction of the transaxle range
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Malfunction of the TCM(PCM)
Malfunction while driving
Poor acceleration
If acceleration is poor even if down
shifting occurs while driving, the cause
is probably a malfunction of the engine
system or of a brake or clutch.
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Malfunction of the engine system
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Malfunction of the brake or clutch