Isuzu Rodeo UE. Manual — part 449
7A–12
AUTOMATIC TRANSMISSION (4L30–E)
Mechanical / Hydraulic Diagnosis
Check Trans Indicator Chart
Perform Preliminary Inspection First!
When the “CHECK TRANS” indicator is flashing, it
indicates that a problem related to the transmission, the
Powertrain Control Module (PCM), or the vehicle harness
has occurred.
The system is now operating in a “BACKUP MODE”
where the risk of further damaging the transmission has
been reduced. The vehicle may be shifted manually.
If the initial problem is intermittent or seldom, switching
the engine OFF/ON might allow normal operation again
until the problem reoccurs.
F07RT013
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
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 5
Go to Step 4
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 (576) 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)
3. Check ball missing or out of location in 2nd and 3rd clutch
pistons.
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
Were DTCs P0560 and 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
—
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