ISUZU TROOPER 1995 Workshop Manual

AUTOMATIC TRANSMISSION (4L30-E) 7A-139
DIAGNOSTIC TROUBLE CODE (DTC) 82
SHIFT OR BAND APPLY SOLENOIDS FAULTY DURING DRIVING
This DTC is set when the car is driven (Engine ON) but the diagnostic is not specific.
To correctly identify the problem, do an IGNITION
CYCLE.
I
If you have not already done an IGNITION CYCLE:
• Turn ignition switch OFF. Turn ignition switch ON
and wait 3 seconds to have the specific diagnostic
done.
• Then you can turn the engine ON or not.
I
Check on Scan Tool or Flashing Code what other DTC is
provided. It should be one of the following: DTC31 or DTC32 or DTC34 or DTC36 or DTC41 or DTC42 or DTC44 or DTC46.
I
GOTO this DTC. I

7A-140 AUTOMATIC TRANSMISSION (4L30-E)
WITHOUT DTC SET
1. If you have already checked the Diagnostic
Trouble Code (DTC) and the scan tool TECH1
does not provide any DTC, and you have
reproduced the
problem and no DTC was
stored:
This means that you have
to check the problem
by comparing the way it should work to the
way it works now that the problem exits.
2. To find the problem, perform the following
tests:
• A/TOil Temperature Indicator Test
• Transmission Operating Mode Test
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-141
A/T OIL TEMPERATURE INDICATOR TEST
1. Working normally if it is ON for 2 to 3 seconds
with ignition switch ON (or when the engine is
cranked)
but it is OFF after.
2. Not working normally if it stays ON always
when ignition is ON.
CD This means that connection between the
Lamp and the Transmission
Control
Module (TCM) is shorted to ground.
r~,··mm -,-,~
• , I
I
TRANSMISSION
CONTROL
MODULE (TCM)
@ Verify if Indicator connector 1-1 terminal 2 is
shorted
to ground.
@ Verify if the TCM connector C-90 terminal
A10 is shorted to ground.
@ Verify that the Indicator connector 1-1
terminal 6 is connected to Battery.
@ If problem not solved GOTO TCM MEM­
CAL REPLACEMENT.
@ If problem solved see CHECK TRANS
INDICATOR
(page 7A-46).
AfT OIL TEMPERATURE INDICATOR ~-~--~I
C-90 ORNJBLU H-9 1~1 :·' ,.· . 'I 1-1 >-A-10--=.:..;.;_;:,=-~>>----<( · , . ' >• • _;__I ;:. 16 2 1 . • .i· ,..:., • 6
I ·•'I• ·. . , . . J
BLU!YEL
BLKJORND
BLK/IILU ~~
I II 1
I I
1_:1;_-:....... _]
WARNING BOX
FUSE BOX

7A-142 AUTOMATIC TRANSMISSION (4l30-E)
TRANSMISSION OPERATING MODE TEST
Circuit
Description:
The Transmission Control Module (TCM) can
controls 4L30-E operation in three modes: Power
mode, Normal mode, and Winter mode. The driver
determines the transmission operating mode
through the Power/Normal mode switch and the
Winter mode switch.
The
Power mode provides better part-throttle ac­
celeration
by delaying part-throttle upshifts.
In Winter mode, the transmission starts in third
gear to reduce tire slippage on ice and snow. When
the driver selects Winter mode, the TCM overrides
the
Power or Normal mode. The TCM will enter
Winter mode only when all of the following
conditions are met:
• Selector lever in D range.
• Vehicle speed 7 mph ( 11 km/h) or less.
•
Transmission oil temperature 120°C (248°F) or
less.
•
Throttle opening 8% or less.
•
Kick-down switch is off.
Winter mode will be canceled if any of the following
conditions are met:
• Driver depresses Winter mode switch again.
• Driver moves selector lever to 3,2 or L (TCM will
stay in Winter mode if lever is moved from D to N
orR or P).
• Ignition switch is turned off.
• Vehicle speed is 21 mph (34 km/h) or more for
longer than one second.
• Transmission oil temperature is greater than
140°C (284·°F).
• Kickdown switch is "ON" for more than 3
seconds.
When Winter mode is canceled, the TCM returns
the transmission
to Normal mode.
HOT IN ON OR START H-9 PNK/GRN
.«19 u
'1----~ FUSEBOX C-10 I 7.5A I
I
____ J
H-25 v 10
lBLUIYEL
14 1-9
r--- - - --AUTOMATIC
I
I I TRANSMISSION
WARNING/
I INDICATOR I ASSEMBLY (METER)
I
I WINTER MODE _INOICATORJ
GRY/WHT
«~13~-BL-K/~G-R-N----]
89 - - -~ 11 C-90
I~POW'ERMOOE-WiNTER MODE 1 TRANSMISSION
INDICATOR INDICATOR I CONTROL I CONTROL CONTROL MODULE !TCMI
I POWER MODE WINTER MODE I _gN~~L[.!NPUT-E!:::J£-BLE INPUl.. I
88 r ----86 rC-90 VIO/RED VIO/GRN 7 16 H-7
3 t ----~ 1 B-30
--\~~~--:~~~~NTER
-T---~
};
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-143
TRANSMISSION OPERATING MODE TEST
IF: When you operated the Power Switch the indicator
turned ON:
•
Press and hold down the Power Switch.
Does TECH1 display "ACTIVE"? •
Install
scan tool GOTHROUGH TECH1 CONNECTION.
• Ignition switch ON.
• Select FO: DATA LIST: POWER SWITCH.
Does TECH1 display "INACTIVE"?
•
Check wire for short to ground between
Transmission Control Module (TCM) connector C-90
terminal
88 and the Power Switch.
IF OK, replace the Power/Winter Switch.
working
normally. •
Check wire for open
between TCM connector C-90
terminal 88 and the Power Switch. IF OK, replace the Power/Winter Switch.
IF: When you operated the Winter Switch the indicator
turned ON:
•
Press and hold down the Winter Switch.
Does TECH1 display "ACTIVE"?
A CONTINUED ON
NEXT~
DATA LIST: WINTER SWITCH.
•
Check wire for short to ground between connector C-90 terminal 86 and the Winter Switch. IF OK, replace the Power/Winter Switch.

7A-144 AUTOMATIC TRANSMISSION (4L30-E)
TRANSMISSION OPERATING MODE TEST
(CONTINUED)
CONTINUED FROM
PREVIOUS
PAGE. A
I
$
The Winter Switch is working normally.
I
• Selector lever in Park .
Does
either Power or Winter mode indicator stay on all the time?
I
$
• Check wire for short to ground
between
TCM connector and indicator (SEE SCHEMATIC).
IF OK, GOTO TCM MEM-CAL REPLACEMENT.
$
• Select F5: ACTUATOR TEST: CHECK POWER LAMP?"
• Press YES .
Does Power Mode Indicator light?
~
The system is functioning
J correctly.
TCM:
Transmission Control Module
$
• Check wire for open between TCM connector C-90 terminal 86 and the Winter Switch.
IF OK, replace the Power/Winter Switch.
$
• Ignition switch ON .
• Selector lever in Neutral and parking brake applied .
• Select F5: ACTUATOR TEST: CHECK WINTER
LAMP?"
• Press YES .
Does Winter Mode Indicator light?
I
$
• Check Fuse, bulb, and wire for open between
connector C-90 terminal A 11 and indicator and
between indicator and fuse.
• Check wire for short til 8+ between connector C-90
terminal A 11 and Indicator. IF OK, GOTO TCM MEM-CAL REPLACEMENT.
$
• Check fuse, bulb, and wire for open between
connector C-90 terminal 89 and indicator and
between indicator andl fuse.
• Check wire for short to 8+ between connector C-90 terminal 89 and indicator.
IF OK, GOTO TCM MEM-CAL REPLACEMENT.
•

AUTOMATIC TRANSMISSION (4L30-E) 7 A-145
TCM PRECAUTONS
The TCM can be damaged by:
(1) The Electrostatic discharge
(2) The short circuit of some terminals to voltage
or to ground.
Electrostatic Discharge Damage Description:
(1) Electronic components used to control systems
are often designed
to carry very low voltage,
and are
very susceptible to damage caused by
electrostatic discharge. It is possible for less
than 100 volts of static electricity to cause
damage
to some electronic components. By
comparison,
it takes as much as 4000 volts for
a person to even feel the zap of a static
discharge.
(2) There are several
ways for a person to become
statically charged. The most common methods
of charging are by friction and induction. An
example
of charging by friction is a person
sliding across a car seat, in
which a charge of
as much as 25,000 volts can build up.
Charging
by induction occurs when a person
with well insulated shoes stands near a highly
charged object and momentarily touches
ground. Charges for the same polarity are
drained off, leaving the person
highly charged
with the opposite polarity. Static charges of
either type can cause damage, therefore, it is
important to use care when handling and
testing electronic components.
NOTICE: To prevent possible Electrostatic
Discharge damage:
(1) Do not touch the TCM connector pins or
soldered components on the TCM circuit
board.
(2) When handling a Mem-Cal (PROM), do not
touch the component leads, and do not
remove integrated circuit from carrier.
(3) Be sure to follow the guidelines listed below if
servicing any of these electronic components:
(4) Do not open the replacement part package
until
it is time to install the part.
(5)
Avoid touching electrical terminals of the part.
(6) Before removing the part from its package,
ground the package to a known good ground
on the vehicle.
(7) Always touch a known good ground before
handling the part. This step should be repeated
before installing
the part if the part has been
handled
while sliding across the seat, while
sitting down from a standing position or while
walking some distance.
INFORMATION ON TCM:
(1) The Transmission Control Module (TCM) is
located in the
driver compartment and is the
control center
of the electronic transmission
control system.
(2) The TCM must be maintained at a temperature
below 185°F (85°C) at all times. This is most
essential if the vehicle is put through a paint
baking process. The
TCM will become in­
operative
if its temperature exceeds 85°C
(185°F). Therefore, it is recommended that the
TCM be removed or that temporary insulation
be placed around the
TCM during the time the
vehicle is in a paint oven
or other high
temperature process.
(3) The
TCM is designed to process the various
inputs and then respond by sending the
appropriate electrical signals
to control trans­
mission upshift,
downshift, shift feel and
torque converter clutch engagement.
(4) The TCM constantly interprets information
from the various sensors, and controls the
systems
that affect transmission and vehicle
performance. By analyzing operational prob­
lems, the
TCM is able to perform a diagnostic
function
by displaying DTC(s) and aid the
technician in making repairs.
PROM/MEM-CAL:
(1) Information for a specific engine and vehicle is
programmed using an integrated circuit called
a Programmable Read-Only
Memory (PROM).
It
is also called a MEM-CAL (Memory Cali­
brator). This allows one model of controller to
be used for many different vehicles. The
PROM is located inside the TCM and has
information on the engine, transmission,
calibration., etc. While one
TCM part number
can be used by many vehicle lines, a PROM is
more specific and must be used only with the
right vehicles. For this reason, it is very
important to check the latest parts book and
Service Bulletin
information for the correct part
number when replacing a PROM.

7A-146 AUTOMATIC TRANSMISSION (4L30-E)
INTERMITTENT CONDITIONS
If the TECH1 displays a diagnostic trouble code as
intermittent, or if after a test drive a DTC does not
reappear though the detection conditions for this
DTC are present: the problem is most likely a faulty
electrical connection or loose wiring. Terminals
and
grounds should always be the prime suspect.
lntermittents rarely occur inside sophisticated
electronic components such
as the TCM.
Use the
DTC information to understand which wires
and sensors are involved.
When an
intermittent problem is encountered,
check suspect circuits for:
(1) Poor terminal to wire connection.
(2) Terminals not fully seated in the connector
body (backed out).
(3) Improperly formed or damaged terminals.
(4) Loose, dirty, or corroded ground connections:
HINT: Any time you have an intermittent in
more than one circuit, check whether the circuits
share a
common ground connection.
(5) Pinched or damaged wires.
(6) Electro-Magnetic Interference (EMI):
HINT:
Check that all wires are properly routed
away from spark plug wires, distributor wires,
coil, and generator. Also check
for improperly
installed electrical options, such as lights, 2-way
radios, etc. Use
the
F3: SNAPSHOT mode of the TECH 1 to help
isolate the cause
of an intermittent fault. The
snapshot
mode will record information before and
after the problem occurs. Set the snapshot
to
"trigger" on the suspect DTC or, if you notice the
reported
symptom during test drive, trigger the
snapshot
manually.
(1) NOTE: When TECH1 is plugged the shifts are
always
done at the maximum pressure. This
means
that if you do SNAPSHOT while driving
you will! notice firm shifts.
After the snapshot has been triggered, command
the TECH1 to play back the flow of data recorded
from each of the various sensors. Signs of an
intermittent fault in a sensor circuit are sudden
unexplainable jump in data values out of the
normal range.
CASE:
problem still not solved GOTO TCM MEM­
CAL REPLACEMENT.
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-147
TCM MEM-CAL REPLACEMENT
(TCM: Transmission Control Module)
1. MEM-CAL (Memory and Calibration Unit)
Information for specific transmission and vehicle is
programmed using an integrated circuit called a
MEM-CAL.
This allows one model of controller to be used for
many different vehicles.
The MEM-CAL is located inside the TCM and has
information on the transmission, shift map, etc.
several others.
2. MEM-CAL Replacement
If the diagnostic procedures require MEM-CAL
replacement,
the MEM-CAL should be replaced
using the following procedures.
NOTICE:
The ignition must be "OFF", when disconnecting or
reconnecting the TCM connector, to prevent
internal damage to the TCM.
NOTICE:
To prevent possible Electrostatic Discharge damage
to the TCM, do not touch the connector pins or
soldered components on the circuit board.
MEM-CAL Replacement Procedure:
1. Remove TCM from driver compartment (Fig.
7A-10a):
( 1) Disconnect negative (-) battery cable.
(2) Remove connectors from TCM.
(3) Remove TCM from driver compartment.
(4) Remove MEM-CAL access cover.
NOTE:
Do not remove any of the other screws.
Fig.
7A-10a
2. Remove MEM-CAL from TCM (Fig. 7A-10b).
•
Using two fingers, pinch both retaining clips
and remove MEM-CAL from the MEM-CAL
socket.
Using unapproved
methods may cause
CAL or socket.
MEM-CAL removal
damage to the MEM- Fig.
7A-10b
3. Check new MEM-CAL
• Check
the part number of the new MEM-CAL
to make sure it is the correct replacement
part.
4. Install new MEM-CAL
• Small notches in the MEM-CAL must be
aligned with small notches in the MEM-CAL
socket (Fig.
7A-10c).
• Gently
press down on the ends of the MEM­
CAL
until the clips are locked. Listen for the
click (Fig. 7A-10d).
! !
($I~rn~ ~~~) . . . . . . . . . . . . . . . ............ .
MEM-CAL MEM-CAL SOCKET
Fig. 7A-10c

7A-148 AUTOMATIC TRANSMISSION (4L30-E)
Fig. 7A-10d
5. Install TCM to driver compartment:
(1) Install MEM-CAL access cover.
(2) Install TCM to driver compartment.
(3) Connect TCM connectors.
(4) Connect negative(-) battery cable.
(5) Do an IGNITION CYCLE and verify correct
CHECK TRANS indicator operation.
l
--------~.-------~------------~~--~'1