Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 632
7A1–28 AUTOMATIC TRANSMISSION (4L30-E)
Normal line pressure
Check internal linkage:
– Manual linkage (58) not moving
manual valve (326)
Check for internal mechanical
damage:
– Turbine shaft (506) broken loose
– Overrun roller clutch (516) broken
loose
– Etc.
Low line pressure
Use CHART 15a: POSSIBLE CAUSES
OF LOW LINE PRESSURE on page
7A1-39
Check
line pressure
CHART 2: NO FORWARD GEARS IN ANY RANGE/NO REVERSE
PERFORM PRELIMINARY INSPECTION FIRST!
Refer to Line Pressure chart
(
in this Section.
)
( ) Refer to Parts List at the end of this Section.
AUTOMATIC TRANSMISSION (4L30-E) 7A1–29
Check
line pressure
CHART 3: NO ENGINE BRAKE IN ANY RANGE
PERFORM PRELIMINARY INSPECTION FIRST!
Refer to Line Pressure chart
(
in this Section.
)
( ) Refer to Parts List at the end of this Section.
Low line pressure
Use CHART 15a: POSSIBLE CAUSES
OF LOW LINE PRESSURE on page
7A1-39
Normal line pressure
Check for overrun clutch leaks caused
by:
– Damaged piston lip (513)
– Check ball defective (504)
Check for overrun lockout valve (705)
stuck by foreign material
Check for leaks at turbine shaft (506)
Caused by:
– Teflon seal rings damaged (508)
– Excessive wear of turbine shaft
bearing surfaces
7A1–30 AUTOMATIC TRANSMISSION (4L30-E)
( ) Refer to Parts List at the end of this Section.
CHART 4: POOR SHIFTING IN ALL GEARS (ALL HARSH OR ALL SOFT)
PERFORM PRELIMINARY INSPECTION FIRST!
Check
line pressure
Low line pressure
Use CHART 15a: POSSIBLE CAUSES
OF LOW LINE PRESSURE on page
7A1-39
High line pressure
Use CHART 15b: POSSIBLE CAUSES
OF HIGH LINE PRESSURE on page
7A1-40
Check for these conditions which
could affect clutch apply time:
•
Defective band apply solenoid
(323)
•
Defective servo or/and
accumulator piston
•
Excessive clutch piston travel
Check of possible causes of internal
leaks:
– Cut or damaged sealing ring(s)
– Damaged sealing gasket (s)
– Check ball missing or out of
location in 2nd and 3rd clutch
pistons
Check for causes of burned clutch
plates or band
Refer to Line Pressure chart
(
in this Section.
)
AUTOMATIC TRANSMISSION (4L30-E) 7A1–31
( ) Refer to Parts List at the end of this Section.
CHART 5a: DELAYS IN DRIVE AND REVERSE
PERFORM PRELIMINARY INSPECTION FIRST!
CHART 5b: DELAYS IN REVERSE ONLY
PERFORM PRELIMINARY INSPECTION FIRST!
Check
line pressure
Normal line pressure
More than 3 second delay in drive and
reverse with engine off 1 hour or less
Teflon seals (508) on turbine shaft
damaged
Low line pressure
Use CHART 15a: POSSIBLE CAUSES
OF LOW LINE PRESSURE on page
7A1-39
NOTE: A short delay (less than 3
seconds) when first engaging drive or
reverse after allowing vehicle to sit
overnight is normal.
Refer to Line Pressure chart
(
in this Section.
)
Check
line pressure
Refer to Line Pressure chart
(
in this Section.
)
Normal line pressure
Main case to valve body gasket (88)
damaged
Reverse check ball (85) in valve body
(84) missing or out of location
Low line pressure
Use CHART 15a: POSSIBLE CAUSES
OF LOW LINE PRESSURE on page
7A1-39
Check for restrictions at valve body
transfer plate orifice
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