Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 400
7A–13
AUTOMATIC TRANSMISSION (4L30–E)
Mechanical / Hydraulic Diagnosis Symptoms Index
Perform Preliminary Inspection First!
CHART
SYMPTOMS
1
NO ENGINE START IN NEUTRAL OR PARK
2
NO FORWARD GEARS IN ANY RANGE/NO REVERSE
3
NO ENGINE BRAKE IN ANY RANGE
4
POOR SHIFTING IN ALL GEARS (ALL HARSH OR ALL SOFT)
5a
DELAYS IN DRIVE AND REVERSE
5b
DELAYS IN REVERSE ONLY
6
DIAGNOSTIC TROUBLE CODE (DTC) P0730
7
HARSH 1–2 SHIFT
8
HARSH 3–4 SHIFT
9a
3–2 DOWNSHIFT COMPLAINT
9b
HARSH SHIFT WHEN SHIFTING INTO “D” OR ACCELERATING FROM STOP
9c
COASTDOWN HARSH SHIFT OR CLUNK AT 3–2 DOWNSHIFT
10
INTERMITTENT 4TH TO 2ND GEAR DOWNSHIFT AT STEADY SPEED
11
ENGINE FLARE AT SHIFTING DURING TURNING ONLY (USUALLY WITH WARM ENGINE)
12
ENGINE FLARE DURING 1–2 OR 2–3 SHIFT
13
SHUDDER ONLY DURING TORQUE CONVERTER CLUTCH (TCC) APPLYING
14
POSSIBLE CAUSES OF TRANSMISSION NOISE
15a
POSSIBLE CAUSES OF LOW LINE PRESSURE
15b
POSSIBLE CAUSES OF HIGH LINE PRESSURE
16
POSSIBLE CAUSES OF TRANSMISSION FLUID LEAKS
NOTE: Numbers with parenthesis on the following charts
refer to
Parts List at end of this section.
Chart 1: No Engine Start In Neutral Or Park
Step
Action
Yes
No
1
Does engine start when shift lever moved from drive to neutral
mostly in hot condition?
Go to
Step 2
Go to
Step 3
2
Does engine start in park at any condition?
Re–test vehicle
Go to
Step 4
3
Does engine also not start in neutral when shift lever moved from
park to neutral?
Go to
Step 4
Go to
Step 5
4
Check mode switch (63) setting. Readjust if necessary.
Problems fixed?
Re–test vehicle
Go to
Step 5
5
Check start circuit of mode switch (63) open in neutral.
Was open found?
Locate and repair
open(s)
Replace mode
switch (63)
7A–14
AUTOMATIC TRANSMISSION (4L30–E)
Chart 2: No Forward Gears In Any Range/No Reverse
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 internal linkage:
– Manual linkage (58) not moving manual valve (326).
2. Check for internal mechanical damage:
– Turbine shaft (506) broken loose.
– Overrun roller clutch (516) broken loose.
Was the problem found?
Repair or replace
—
Chart 3: No Engine Brake In Any Range
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 overrun clutch leaks caused by:
– Damaged piston lip (513)
– Check ball defective (504)
2. Check for overrun lockout valve (705) stuck by foreign
material.
3. Check for leaks at turbine shaft (506) caused by:
– Teflon seal rings damaged (508)
– Excessive wear of turbine shaft bearing surfaces.
Was the problem found?
Repair or replace
—
7A–15
AUTOMATIC TRANSMISSION (4L30–E)
Chart 4: Poor Shifting In All Gears (All Harsh Or All Soft)
Step
Action
Yes
No
1
Check line pressure. Refer to
Line Pressure Test in this section.
Was line pressure normal?
Go to
Step 2
Go to
Step 3
2
1. 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.
2. 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.
3. Check for causes of burned clutch plates or band.
Was the problem found?
Repair or replace
—
3
Was the line pressure high?
Go to
Step 4
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section
4
Does DTC P0705 set?
Diagnose those
DTC(s) first
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section
Chart 5a: Delays In Drive And Reverse
NOTE: A short delay (less than 3 seconds) when first
engaging drive or reverse after allowing vehicle to sit
overnight is normal.
Step
Action
Yes
No
1
Check line pressure. Refer to
Line Pressure Test in this section.
Was line pressure normal?
More than 3
second delay in
drive and reverse
with engine off 1
hour or less.
Teflon seals (508)
on turbine shaft
damaged. Repair
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section.
Chart 5b: Delays In Reverse Only
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
Main case valve body gasket (88) damaged.
– Reverse check ball (85) in valve body (84) missing or out of
location.
– Check for restrictions at valve body transfer plate orifice.
Was the problem found?
Repair
—
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.
Go to
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
—
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