Isuzu Rodeo UE. Manual — part 450
7A–16
AUTOMATIC TRANSMISSION (4L30–E)
Chart 6: Diagnostic Trouble Code (DTC) P0730
Step
Action
Yes
No
1
Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section.
2
1. 1st and 2nd gear missing or 3rd and 4th gear missing.
Check appropriate shift valve. If OK replace solenoid.
2. No engine brake in any range (All ranges in Drive and Reverse
are OK)
Check for suspected conditions modifying delays to clutch
apply:
– Overrun clutch seal damaged.
– Excessive overrun clutch piston travel.
– Defective 3–4 accumulator piston.
– Causes of internal leaks.
– Causes of burned clutch plates.
3. 1st and 4th gear missing or 2nd and 3rd gear missing.
Shift solenoid A stuck. Replace shift solenoid A.
4. DTC P0730 is set in D range 1st gear above 3500 rpm.
Go to Step 3.
5. DTC P0730 is set in D range 3rd gear between 55-80 mph.
NOTE: Perform this test within safe and legal limits.
Check for suspected conditions modifying delays to clutch
apply:
– 4th clutch seal damaged.
– Excessive 4th clutch piston travel.
– Defective 3–4 accumulator piston.
– Causes of internal leaks.
– Causes of burned clutch plates.
Was the problem found?
Repair or replace
—
3
Check 3rd gear in “D” in winter mode.
Does vehicle move?
Shift solenoid A
stuck. Replace
shift solenoid A.
Goto Step 4
4
Check for suspected conditions modifying delays to clutch apply:
– 2nd clutch seal damaged.
– Excessive 2nd clutch piston travel.
– Defective accumulator piston.
– Causes of internal leaks.
– Check ball missing or out of location in 2nd clutch.
– Seals cut, damaged or missing.
– Gaskets defective.
– Causes of burned clutch plates.
Was the problem found?
Repair or replace
—
7A–17
AUTOMATIC TRANSMISSION (4L30–E)
Chart 7: Harsh 1–2 Shift
Step
Action
Yes
No
1
Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Check for 1–2
accumulator
valve (320) stuck
by foreign
material in main
case valve body.
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section.
Chart 8: Harsh 3–4 Shift
Step
Action
Yes
No
1
Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section.
2
1. Check for 3–4 accumulator valve (407) stuck in adapter case
valve body (401).
2. Check for 3–4 accumulator piston (18) stuck in adapter case
(20).
Was the problem found?
Repair or replace
—
Chart 9a: 3–2 Downshift Complaint
Step
Action
Yes
No
1
Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section.
2
Does DTC P1850 set?
Diagnose P1850
first.
Replace band
apply solenoid
(PWM) (323).
Chart 9b: Harsh Shift When Shifting Into “D” Or Accelerating From Stop
Step
Action
Yes
No
1
Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section.
2
Does DTC P1850 set?
Diagnose P1850
first.
Replace band
apply solenoid
(PWM) (323).
7A–18
AUTOMATIC TRANSMISSION (4L30–E)
Chart 9c: Coastdown Harsh Shift Or Clunk At 3–2 Downshift
Step
Action
Yes
No
1
Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section.
2
Does DTC P1850 set?
Diagnose P1850
first.
Replace band
apply solenoid
(PWM) (323).
Chart 10: Intermittent 4TH TO 2ND Gear Downshift At Steady Speed
Step
Action
Yes
No
1
Check for consistent speed sensor reading with scan tool.
Was the reading correct?
Replace mode
switch for
intermittent
contact.
Go to Step 2
2
1. Check for wiring harness damage or short to ground. If OK, go
to (2).
2. Check transmission speed sensor connections. If OK, go to
(3).
3. Replace transmission speed sensor.
Was the replacement complete?
—
Replace speed
sensor.
Chart 11: Engine Flare At Shifting During Turning Only (Usually With Warm Engine)
Step
Action
Yes
No
1
Check for oil leaks at transmission.
Was the problem found?
Replace
transmission oil
filter and gasket.
—
Chart 12: Engine Flare During 1–2 Or 2–3 Shift
Step
Action
Yes
No
1
Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section.
2
1. Check for a stuck 1–2 accumulator valve (320).
2. Check for servo piston (106) leaks.
3. Check for a stuck band apply solenoid (323).
Was line pressure normal?
Repair or replace
—
7A–19
AUTOMATIC TRANSMISSION (4L30–E)
Chart 13: Shudder Only During Torque Converter Clutch (TCC) Applying
Step
Action
Yes
No
1
1. TCC shudder is one of the most commonly misdiagnosed
conditions in an automatic transmission. The key to
diagnosing TCC shudder is to note when it happens and under
what conditions. Once the TCC has been fully applied, it is
nearly impossible to make it shudder. TCC shudder (short
burst of noise normally less than 1 second) will only occur
during clutch applying. It is not a steady state condition.
2. Drive until whole drivetrain is at normal operating temperature.
– On 4WD vehicles, the test must be performed with transfer
case selector lever in “2H” position.
– Shudder is a short burst of noise normally less than 1 second
in duration, and can be induced by the following maneuver:
3. From coast condition at 50 mph in “D” range (Normal mode),
depress the throttle to 1/4-1/3 throttle. If present, shudder will
occur within 5 seconds together with TCC application.(The
scan tool may be used to determine the exact time of TCC).
Was the problem found?
Replace
transmission fluid
and filter (remove
both pans) and
flush cooler lines.
Replace
converter
assembly and
O-ring on turbine
shaft
Perform
mechanical
inspection of
other drivetrain
components.
Chart 14: Possible Causes of Transmission Noise
CAUTION: Before checking transmission for what
is believed to be transmission noise, ensure
presence and positioning of insulating plugs, pads
etc. Also make sure that noise does not come from
other drivetrain components.
Condition
Possible cause
Correction
Whine or Buzz
Oil level low
Fill with ATF, check for external
leaks.
Plugged or restricted oil filter
Inspect oil filter.
Replace oil filter or ATF as necessary.
Damaged oil filter gasket
Replace oil filter gasket.
Knocking noise from front of
transmission
Loose bolts (Converter to flex plate)
Tighten to specifications.
transmission.
Cracked or broken flex plate
Replace flex plate.
Converter damaged
Replace converter.
Knocking noise while driving, mostly
on acceleration.
Transmission mount loose or broken
Tighten mount bolts or replace
transmission mount.
Cooler line mounts loose or broken
Tighten or replace cooler line
mounts.
Cooler lines touching body or frame
Repair or replace as necessary.
Knocking noise when vehicle is
stationary
Loose flex plate mounting bolts
Tighten to specifications.
stationary.
Cracked or broken flex plate
Replace flex plate.
Damaged converter
Replace converter.
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