INSPECTION PROCESS FOR TROUBLE
SYMPTOMS |
INSPECTION PROCEDURE 1
Communication with the scan
tool
|
Possible cause
|
If communication
with the scan tool is not possible, the cause may be a defective
diagnostic trouble line or the TCM is not functioning.
|
•
|
Malfunction of diagnostic trouble
line |
•
|
Malfunction of
connector |
|

INSPECTION PROCEDURE 2
Starting
impossible
|
Possible cause
|
Starting is not
possible when the selector lever is in P or N range. In such cases,
the cause may be a defective engine system, torque converter or oil
pump.
|
•
|
Malfunction of the engine
system |
•
|
Malfunction of the torque
converter |
•
|
Malfunction of the oil
pump | |

INSPECTION PROCEDURE 3
Does not move
|
Possible cause
|
If the vehicle
does not move forward when the selector lever is shifted from N to D
range while the engine is idling, the cause may be abnormal line
pressure or a malfunction of the underdrive clutch or valve
body.
|
•
|
Malfunction of the underdrive solenoid
valve |
•
|
Malfunction of the underdrive
clutch |
•
|
Malfunction of the valve
body | |

INSPECTION PROCEDURE 4
Does not reverse
|
Possible cause
|
If the vehicle
does not reverse when the selector lever is shifted from N to R
range while the engine is idling, the cause may be abnormal pressure
in the reverse clutch or low and reverse brake or a malfunction of
the reverse clutch, low and reverse brake or valve
body.
|
•
|
Abnormal reverse clutch
pressure |
•
|
Abnormal low and reverse brake
pressure |
•
|
Malfunction of the low and reverse
solenoid valve |
•
|
Malfunction of the reverse
clutch |
•
|
Malfunction of the low and reverse
brake |
•
|
Malfunction of the valve
body | |

INSPECTION PROCEDURE 5
Does not move (forward or
reverse)
|
Possible cause
|
If the vehicle
does not move forward or reverse when the selector lever is shifted
to any position while the engine is idling, the cause may be
abnormal line pressure, or a malfunction of the power train, oil
pump or valve body.
|
•
|
Abonormal line
pressure |
•
|
Malfunction of the underdrive solenoid
valve |
•
|
Malfunction of the underdrive
clutch |
•
|
Malfunction of the valve
body | |

INSPECTION PROCEDURE 6
Engine stalling when
shifting
|
Possible cause
|
If the engine
stalls when the selector lever is shifted from N to D or R range
while the engine is idling, the cause may be a malfunction of the
engine system, torque converter clutch soledoid, valve body or
torque converter (torque converter clutch
malfunction).
|
•
|
Malfunction of the engine
system |
•
|
Malfunction of the torque converter
clutch solenoid |
•
|
Malfunction of the valve
body |
•
|
Malfunction of the torque converter
(Malfunction of the torque converter
clutch) | |

INSPECTION PROCEDURE 7
Shocks when changing from N to
D and range time lag
|
Possible cause
|
If abnormal
shocks or a time lag of 2 second or more occurs when the selector
lever is shifted from N to D range while the engine is idling, the
cause may be abnormal underdrive clutch pressure or a malfunction of
the underdrive clutch, valve body or closed throttle position
switch.
|
•
|
Malfunction of the underdrive solenoid
valve |
•
|
Malfunction of the underdrive
clutch |
•
|
Malfunction of the valve
body |
•
|
Malfunction of the closed throttle
position
switch | |

INSPECTION PROCEDURE 8
Shock when changing from N to R
and large time lag
|
Possible cause
|
If abnormal
shocks or a time lag of 2 seconds or more occurs when the selector
lever is shifted from N to R range while the engine is idling, the
cause may be abnormal reverse clutch pressure or low and reverse
brake pressure, or a malfunction or the reverse clutch, low and
reverse brake, valve body.
|
•
|
Abnormal reverse clutch
pressure |
•
|
Abnormal low and reverse brake
pressure |
•
|
Malfunction of the low and reverse
solenoid valve |
•
|
Malfunction of the reverse
clutch |
•
|
Malfunction of the low and reverse
brake |
•
|
Malfunction of the valve
body | |

INSPECTION PROCEDURE 9
Shocks when changine from N to
D, N to R and large time lag
|
Possible cause
|
If abnormal
shocks or a time lag of 2 seconds or more occurs when the selector
lever is shifted from N to D, N to R range while the engine is
idling, the cause may be abnormal line pressure or a malfunction of
the oil pump or valve body.
|
•
|
Malfunction of the oil
pump |
•
|
Malfunction of the valve
body | |

INSPECTION PROCEDURE 10
Shocks and running
up
|
Possible cause
|
If shocks occur
when driving due to upshifting or downshifting and the transaxle
speed becomes higher than the engine speed, the cause may be
abnormal line pressure or a malfunction of a solenoid valve, oil
pump, valve body or of a brake or clutch.
|
•
|
Malfunction of each solenoid
valve |
•
|
Malfunction of the oil
pump |
•
|
Malfunction of the valve
body |
•
|
Malfunction of each brake or each
clutch | |

INSPECTION PROCEDURE 11
All points (Displaced shifting
points)
|
Possible cause
|
If all shift
points are displaced while driving, the cause may be a malfunction
of the output shaft speed sensor, TPS or a solenoid
valve.
|
•
|
Malfunction of the output shaft speed
sensor |
•
|
Malfunction of the throttle position
sensor |
•
|
Malfunction of each solenoid
valve |
•
|
Malfunction of the valve
body |
|

INSPECTION PROCEDURE 12
Some points (Displaced shifting
points)
|
Possible cause
|
If some of the
shift points are displaced while driving, the cause may be a
malfunction of the valve body, or it is related to control and is
not an abnormality.
|
•
|
Malfunction of the valve
body | |

INSPECTION PROCEDURE 13
No diagnostic trouble codes
(Does not shift)
|
Possible cause
|
If shifting does
not occur while driving and no diagnostic trouble codes are given,
the cause may be a malfunction of the Park/Neutral position switch,
or TCM.
|
•
|
Malfunction of the Park/Neutral position
switch |
|

INSPECTION PROCEDURE 14
Poor acceleration
|
Possible cause
|
If acceleration
is poor even if downshifting occurs while driving, the cause may be
a malfunction of the engine system or of a brake or
clutch.
|
•
|
Malfunction of the engine
system |
•
|
Malfunction of the brake or
clutch | |

INSPECTION PROCEDURE 15
Vibration
|
Possible cause
|
If vibration
occurs when driving at constant speed or when accelerating in top
range, the cause may be abnormal torque converter clutch pressure or
a malfunction of the engine system, torque converter clutch
solenoid, torque converter or valve body.
|
•
|
Abnormal torque converter clutch
pressure |
•
|
Malfunction of the engine
system |
•
|
Malfunction of the torque converter
clutch solenoid |
•
|
Malfunction of the torque
converter |
•
|
Malfunction of the valve
body | |

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