Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 896
7A–10
AUTOMATIC TRANSMISSION (4L30–E)
Checking Transmission Fluid Level
and Condition
Checking fluid level and condition (color and odor) at
regular intervals will provide early diagnosis information
about the transmission. This information may be used to
correct a condition that, if not detected early, could result
in major transmission repairs.
IMPORTANT:
When new, automatic transmission fluid
is red in color. As the vehicle is driven, the transmission
fluid will begin to look darker in color. The color may
eventually appear light brown.
A dark brown color with burnt odor may indicate
excessive fluid deterioration and signal a need for fluid
change.
Fluid Level
When adding or changing fluid, use only DEXRON
–III.
Refer to Maintenance and Lubrication in General
Information section for maintenance information and
servicing interval.
CAUTION: DO NOT OVERFILL.
Overfilling will cause foaming, loss of fluid, abnor-
mal shifting and possible damage to the transmis-
sion.
1. Park the vehicle on level ground and apply the parking
brake firmly.
2. Check fluid level with engine running at idle.
NOTE: Be sure that transmission fluid temperature is
below 30
°
C (86
°
F).
3. Move the selector lever through all gear ranges.
4. Move the selector lever to “Park”.
5. Let engine idle for 3 minutes and open the overfill
screw (1).
6. Add released transmission fluid until it flows out over
the overfill screw opening.
7. Let engine idle until a fluid temperature between 32
°
C
(90
°
F) and 57
°
C (135
°
F) is reached, then close the
overfill screw (1).
Torque: 38 N
•
m (28 lb ft)
NOTE: To prevent fluid leaks, the overfill screw and oil
drain screws gasket must be replaced each time these
screws are removed.
NOTE: Check transmission fluid temperature with scan
tool.
Minimum fluid level
→
57
°
C (135
°
F)
Maximum fluid level
→
32
°
C (90
°
F)
242RW003
CAUTION: Do not open overfill screw with engine
stopped.
CAUTION: DO NOT CHECK FLUID LEVEL UNDER
THESE CONDITIONS:
D
Immediately after driving at sustained highway
speeds.
D
In heavy city traffic during hot weather.
D
If vehicle is towing a trailer.
If the vehicle has been operated under these conditions,
shut the engine off and allow the vehicle to “cool” for thirty
(30) minutes. After the cool down period, restart the
vehicle and continue from step 2 above.
7A–11
AUTOMATIC TRANSMISSION (4L30–E)
Fluid Condition
FLUID CONDITION
NORMAL*
CONTAMINATED
COLOR
RED OR LIGHT
BROWN
BROWN
NON–TRANSPARENT
/ PINK
BROWN
DRAIN
REQUIRED?
NO
YES
YES
YES
CONTAMINA–
TION
NONE
Very small amount of
foreign material in
bottom of pan
Contamination by
coolant or other source
Large pieces of metal
or other foreign
material in bottom of
pan
CORRECT
LEVEL AND
CONDITION
1. LOW LEVEL:
A. Add fluid to
obtain proper
level & check for
external leaks.
B. Correct cause of
leak.
2. HIGH LEVEL:
– Remove excess
fluid
– Remove both pans
– Change filter
– Flush cooler
– Add new fluid
– Check level
– Repair/replace
radiator cooler
– Transmission
overhaul required
– Check for:
D
Damaged plates
and seals
D
Contaminated
solenoids
– Flush cooler
– Add new fluid
– Check level
– Transmission
overhaul required
– Flush cooler and
cooler lines
– Add new fluid
– Check level
*Fluid should be changed according to maintenance
schedule.
Test Driving
Some 4L30–E automatic transmission complaints will
require a test drive as a part of the diagnostic procedure.
Some codes will not set unless the vehicle is moving. The
purpose of the test drive is to duplicate the customer’s
complaint condition and set a current Powertrain Control
Module (PCM) trouble code. Perform this procedure
before each 4L30–E automatic transmission repair, and
again after repairs are made.
IMPORTANT:
D
Duplicate the condition under which the customer’s
complaint was observed.
D
Depending on the complaint, the line pressure gauge
and the scan tool may be required during the test
drive.
D
During the test drive, it is important to record all
necessary data from the areas being monitored, for
use in diagnosis. Also listen for and note any unusual
noises.
The following procedure should be used to test drive
4L30–E automatic transmission complaint vehicles:
1. Turn the ignition ON without starting the engine.
Check that the “CHECK TRANS” lamp comes on for
approximately 2 seconds and then goes out and
remains out.
D
If the lamp is flashing, GOTO Check Trans Indicator
in Transmission Control System (4L30–E) section.
D
If no serial data is present, GOTO OBD System
Check. Refer to Driveability and Emissions in
Engine section.
D
If the lamp stays ON or stays OFF, GOTO “Check
Trans” Check in Transmission Control System
(4L30–E) section.
2. Drive the vehicle. During the test drive, be sure that
the transmission achieves normal operating
temperature (approx. 20 minutes).
Allow the transmission to go through all of its gear
ranges, checking shift timing and firmness. Duplicate
the owner ’s complaint condition as closely as
possible during the test drive.
3. If, during the test drive, the “CHECK TRANS” lamp
comes on, use the scan tool to check for trouble
codes.
4. If, during the test drive, a problem is felt, but the
“CHECK TRANS” lamp does not come on and no
trouble codes are present, drive the vehicle with the
PCM disconnected (manually shifting the vehicle).
D
In Manual L, the vehicle operates in first gear.
D
In Manual 2, the vehicle operates in third gear.
D
In Manual 3 or “D”, the vehicle operates in fourth
gear.
If the problem still exists with the PCM disconnected,
refer to Mechanical/Hydraulic Diagnosis in this
section.
5. If no problem has been found at this point, check all
underhood connections that supply power to the PCM
and ignition fuses. Physically and visually inspect all
the PCM harness connectors for loose or corroded
terminals. Inspect the PCM ground points.
7A–12
AUTOMATIC TRANSMISSION (4L30–E)
Mechanical / Hydraulic Diagnosis Check Trans Indicator Chart
Perform Preliminary Inspection First!
F07RT013
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.
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)
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