2004 ISUZU TF SERIES torque

TRANSFER CONTROL SYSTEM 7D1-37
Step 4-3: (Same procedure as the step 3-3)
Stop the vehicle (close the accelerator and decrease the engine speed to L4: 3000rpm V6: 2000rpm or
below).
(In case of AT): Set the transmission select lever to the N position.
(In case of MT): Set the transmission lever to the neutral position (stepping on the clutch lever is
recommendable).
Push the 4H button.
If the shifting is not completed (indicator flashes at 2Hz), go to the step 4-1.

5. When shifting from 4H or 4L to neutral
(Same procedure is required when shifting from 2H but in such a case, requirements for shifting from
2H to 4H are also applied.)
5-1 Neutral indicator continues flashing at 2Hz
The neutral indicator continues flashing at 2Hz until 4H (4L) is completely separated in the transfer. If
torsional torque has accumulated between the transmission and road surface, separation may be difficult.

Step 5-1:
If the operation is not completed, execute the step 7 for confirmation.
(In case of AT): Set the transmission select lever to the D position.
After confirming that the gears are at the neutral position, return the lever to the N
position.
(In case of MT): Set the transmission lever to a vehicle running position and engage the clutch gently.
After confirming that the gears are at the neutral position, return the lever to the
neutral position

5-2 When the neutral indicator flashes at 4Hz
As in the case of shifting from 4L to 4H, restriction is imposed to the operation from 4L or 4H (including 2H).
If the transmission lever is at a running range and engine speed is high (L4: 3000rpm, V6: 2000rpm or more)
while the vehicle is running, operation from the 4L or 4H (including 2H) of the transfer to the neutral is
impossible (restriction on operation).

Step 5-2:
Stop the vehicle.
(In case of AT): Set the transmission select lever to the N (or P) position.
(In case of MT): Set the transmission lever to the neutral position (at this time, stepping on the clutch
is recommended).
Keep pushing the 2H and 4L button for 10 second.
Follow the start procedure for confirmation. (Confirmation of drive force not transferred; same as in the
step 5-1)
After the confirmation, set the transmission to the neutral position in case of MT or to the neutral
position in case of AT.

TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-1
TRANSMISSION
TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)
CONTENTS

Service Precaution .................................................
7A2-2
General Description ...............................................
7A2-2
Electronic Control Diagram ...............................
7A2-3
Transmission Control Module (TCM) (1/2) ......
7A2-4
Transmission Control Module (TCM) (2/2) ......
7A2-5
TCM Point Table .................................................
7A2-6
TCM Voltage & Resistance Check Sheet .......
7A2-7
Control System Diagram ....................................
7A2-9
Control and Functions ........................................
7A2-10
Gear Shift Control 3rd start ...............................
7A2-10
Mode Type ...........................................................
7A2-10
Mode Selection ....................................................
7A2-10
Comparison of mode ..........................................
7A2-11
3rd start Mode .....................................................
7A2-11
Backup Mode .......................................................
7A2-11
Functions of Input / Output Components ........
7A2-12
CAN bus systems in automatic transmission
control (AW30-40LE) ........................................
7A2-13
High speed CAN bus ..........................................
7A2-13
Diagnosis .................................................................
7A2-13
Electronic Diagnosis ...........................................
7A2-13
Check Trans Indicator ........................................
7A2-13
On Board Diagnostic Check ..............................
7A2-13
"Check Trans" Check .........................................
7A2-14
Tech 2 OBD Connection ....................................
7A2-17
Snapshot Display With TIS2000 .................. 7A2-23
Service Programming System (SPS)............. 7A2-27
OBD Diagnostic Management System ............
7A2-30
16 - Terminal Data Link Connector (DLC) ......
7A2-31
Clear DTC ............................................................
7A2-32
DTC Check ..........................................................
7A2-32
TCM Precaution ..................................................
7A2-32
Information On TCM ...........................................
7A2-32
TCM Diagnostic Trouble Codes ........................
7A2-33
DTC P0560 (FLASHING CODE 25)
System Voltage Error ...........................................
7A2-34

DTC P0602 (FLASHING CODE 63)
Transmission Control Module (TCM)
Programming Error ................................................
7A2-36
DTC P0705 (FLASHING CODE 17)
Transmission Range Sensor Circuit
Malfunction .............................................................
7A2-38
DTC P0712 (FLASHING CODE 15)
Transmission Oil Temperature Sensor
Circuit Low Input ....................................................
7A2-42
DTC P0713 (FLASHING CODE 16)
Transmission Oil Temperature Sensor
Circuit Hight Input ..................................................
7A2-45
DTC P0717 (FLASHING CODE 14)
Input Speed Sensor Signal Error .........................
7A2-48
DTC P0722 (FLASHING CODE 11)
Output Speed Sensor Signal Error .....................
7A2-51
DTC P0743 (FLASHING CODE 33)
Torque Converter Clutch Electrical .....................
7A2-54
DTC P0748 (FLASHING CODE 35)
Pressure Control Solenoid Electrical ..................
7A2-57
DTC P0753 (FLASHING CODE 31)
Shift Solenoid S1 Electrical ..................................
7A2-60
DTC P0758 (FLASHING CODE 32)
Shift Solenoid S2 Electrical ..................................
7A2-63
DTC P1767 (FLASHING CODE 67)
ECM CAN Invalid ...................................................
7A2-66
DTC P1790 (FLASHING CODE 61)
Transmission Control Module ROM
Checksum Error .....................................................
7A2-69
DTC P1791 (FLASHING CODE 62)
Transmission Control Module RAM
Error .........................................................................
7A2-71
DTC U2104 (FLASHING CODE 65)
CAN BUSS OFF ....................................................
7A2-73

7A2-2 TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L)

Service Precaution
WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS). REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN
ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING. WHEN YOU
ARE PERFORMING SERVICE ON OR NEAR THE
SRS COMPONENTS OR THE SRS WIRING, REFE
R
TO THE SRS SERVICE INFORMATION. FAILURE TO
FOLLOW WARNINGS COULD RESULT IN
POSSIBLE AIR BAG DEPLOYMENT, PERSONAL
INJURY, OR OTHERWISE UNNEEDED SRS SYSTEM
REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, o
r
other corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener.
When you install fasteners, use the correct
tightening sequence and specifications. Following
these instructions can help you avoid damage to
parts and systems.
General Description
The AW30-40LE is a 4–speed fully automatic
transmission. It uses a microcomputer as a control unit
to judge running conditions including throttle opening
rate and vehicle speed, then it sets the shifting point in
the optimum timing so that best driving performance
can be achieved.
In addition, the built–in shift mode select function can
select three shift modes according to the driver's
preference:
 Normal mode –Normal shift pattern.
 3rd Start mode –Starts in 3rd gear to reduce
slippage on ice or snow.
 Power mode has a delayed up shift when more
powerful acceleration is required.
Also, the built–in fail–safe function (“backup mode")
assures driving performance even if the vehicle speed
sensor, throttle signal or any solenoid fails.
Further, the self–diagnostic function conducts diagnosis
in a short time when the control system fails, thus
improving serviceability.
The major features of AW30-40LE are as follows:

A compact structure consisting of 2 sets of planetary
gears and flat torque converter.
 Electronic control selects the optimum shift mode according to the driving conditions.
 Electronic control maintains the optimum hydraulic
pressure for clutch, band brake as well as
transmission so that shift feeling is improved.
 Two sets of planetary gears reduce friction of powe
r
train.
Also, a lockup mechanism in the torque converter
reduces fuel consumption.
 Wide gear ratio and high torque rate of torque
converter provide excellent starting performance.

7A2-10 TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L)

Control and Functions
Shift Control
The transmission gear is shifted according to the shift
pattern selected by the driver. In shifting gears, the
gear ratio is controlled by the ON/ OFF signal using the
shift solenoid S1 and the shift solenoid S2.
Band Apply Control
The band apply is controlled when in the 3 –2 downshift
(engine overrun prevention) and the garage shift (shock
control).
The band apply solenoid is controlled by the signal from
the Pulse Width Modulation (PWM) to regulate the flow
of the oil.
Torque Converter Clutch Control
The clutch ON/OFF is controlled by moving the
converter clutch valve through shifting Torque
Converter Clutch (TCC) solenoid using the ON/OFF
signal.
Line Pressure Control
The throttle signal allows the current signal to be sent
to the force motor. After receiving the current signal,
the force motor activates the pressure regulator valve
to regulate the line pressure.
On –Board Diagnostic System
Several malfunction displays can be stored in the
Transmission Control Module (TCM) memory, and read
out of it afterward.
The serial data lines, which are required for the testing
of the final assembly and the coupling to othe
r
electronic modules, can be regulated by this function.
Fail –Safe Mechanism
If there is a problem in the transmission system, the
TCM will go into a “backup" mode.
The vehicle can still be driven, but the driver must use
the select lever to shift gears.
Torque Management Control
The transmission control side sends the absolute spark
advance signal to the engine control side while the
transmission is being shifted. This controls the engine
spark timing in compliance with the vehicle running
condition to reduce the shocks caused by the change o
f
speed.
ATF Warning Control
The oil temperature sensor detects the ATF oil
temperature to control the oil temperature warning,
TCC, and the 3rd start mode.
Reverse Lock Out Control
With the selector lever in reverse position, the TCM will
not close the PWM solenoid until the vehicle is below
15 km/h (9.3 mph), thus preventing reverse
engagement above this speed.

Downhill Control
This mode is automatically activated from NORMAL
mode only when downhill conditions are recognized.
The shift pattern is identical to NORMAL mode except
3-4 and 4-3 shift lines at low throttle modified to get
engine braking on a larger speed range.
Uphill Control
When uphill condition are recognized the 2-3 and 3-4
shift and TCC apply are down only when the engine
torque is sufficient in order to avoid shift hunting.
Gear Shift Control 3rd start


SELECT LEVER RANGE SHIFT PATTERN
D(Drive) 1


2TCC

3TCC

4TCC
3(Third) 1

2TCC

3TCC
2(Second) 1

2(
3)
L(First) 1(
2)
TCC: Torque Converter Clutch
(Notice1): “( )" means over-revving prevention control.
Mode Type


Mode Type Select lever position
Normal drive mode
(NOR) Entire range (excluding “R")
Power drive mode
(PWR) Entire range (excluding “R")

Mode Selection



SWITCH(SW) LAMP
Mode Type PWR/N
OR.S 3RD
START SW POWER
DRIVE LAMP 3RD
START LAMP
Normal
drive mode
(NOR) OFF OFF OFF OFF
Power
drive mod
(PWR) ON OFF ON OFF
3rd Start
mode OFF ON OFF ON
However, the 3rd start switch prevails over the
PWR/NOR switch.
The mode become normal drive mode when the 3rd
start switch is operated from ON to OFF.

7A2-22 TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L)

TRANSMISSION DATA
ITEM UNIT ENGIN RUNNING AT IDLE
Current Gear 1 st/2 nd/3 rd/4 th 1 st
Target Gear 1 st/2 nd/3 rd/4 th 1 st
Vehicle Speed km/h 0 km/h
AT Output Speed (Automatic Transmission) RPM 0 RPM
AT Input Speed (Automatic Transmission) RPM 675725 RPM
Engine Speed RPM 675725 RPM
Throttle Position Sensor Signal % 0.007.00%
AT Oil Temperature (Automatic Transmission) C Depends on conditions
TCM Status Transfer Low /Transfer High Transfer HI
Desired PC Solenoid Pressure (STH) kPa 34.397.0 kPa
Desired PC Solenoid Current (STH) mA 8351020 mA
PC Solenoid Actual Current (STH) mA 8351020 mA
Gear Ratio : 1 Depends on uper hood
TCC Slip Speed RPM 0 RPM
Shift Position Actual P/R/N/L/2/3 P
Inhibitor Switch P/R/N/L/2/3 P
Transmission Check Light On/Off Off
AT Oil Temperature Lamp (Automatic
Transmission) On/Off Off
3 rd Start Lamp On/Off Off
Power Lamp On/Off Off
Shift Solenoid S1 On/Off On
Shift Solenoid S2 On/Off On
Shift Solenoid S3 On/Off Off
Diag Switch Condition On/Off Off
Power Switch On/Off Off
Brake Switch On/Off Off
Cruise Switch On/Off Off
4L Signal On/Off Off
3 rd Start Switch On/Off Off
Coolant Temperature C Depends on conditions
Torque Request (timing Retard) CA 0 CA
Garage Shift Mode On/Off Off
CAN TPS % 0.00%
CAN Signal Valid Counter (ECM)
— 0  255
CAN Signal Valid Counter (TCM) — 0  255

7A2-32 TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L)

Clear DTC
NOTE: If you clear the DTC (Diagnostic Trouble
Codes) you will not be able to read any codes recorded
during the last occurrence.
NOTE: To use the DTC again to identify a problem,
you will need to reproduce the fault or the problem.
This may require a new test drive or just turning the
ignition on (this depends on the nature of the fault).
1. IF you have a Tech 2:
1. Connect the Tech 2 if it is still not connected go
through Tech 2 OBD CONNECTION.
2. Push “F1: Clear DTC Information" in the
Application Menu and answer “Yes" to the
question “Do you want to clear DTC's?"
a. When a malfunction still exists and the Tech 2 displays “AW30-40 CODES NOT
CLEARED". This means that the problem is
still there or that the recovery was not done.
Please go to DTC CHECK.
b. When a malfunction has been repaired and the recovery is done the Tech 2 displays
“ AW30-40LE CODES CLEARED".
2. When you have no Tech 2, the storaged trouble
codes can be cleared by shorting the terminals
No.11 and No.4 or 5 (ground) of data link connecto
r
with a lead wire for 1  6 seconds.
DTC Check
1. Diagnostic Trouble Codes (DTC) have been
identified by Tech 2.
2. You have written the list of the DTCs. The order o
f
the malfunctions has no meanings for this TCM.
Usually only one or two malfunctions should be set
for a given problem.
3. Check directly the DTCs you identified. The DTCs
are sorted by number. Refer to Diagnostic Trouble
Code (DTC) Identification in this section.
TCM Precaution
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 4,000 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 o
f
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.
NOTE: To prevent possible electrostatic discharge
damage:
1. Do not touch the TCM connector pins or soldered
components on the TCM circuit board.
2. Be sure to follow the guidelines listed below i
f
servicing any of these electronic components:
3. Do not open the replacement part package until it is time to install the part.
4. Avoid touching electrical terminals of the part.
5. Before removing the part from its package, ground
the package to a known good ground on the
vehicle.
6.
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 place of a clutch pedal and is the control
center of the electronic transmission control
system.
2. The TCM must be maintained at a temperature below 85

C (185

F) at all times. This is most
essential if the vehicle is put through a paint baking
process. The TCM will become inoperative 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 o
r
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 transmission 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 problems, the TCM is able to

7A2-34 TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L)

TCM Diagnostic Trouble Codes
The following table lists the diagnostic trouble codes supported by this vehicle application. If any DTCs not listed here
are displayed by a scan tool, the scan tool data may by faulty; notify the scan tool manufacture of any DTCs
displayed that are not included in the following table.
DTC
NUMBER FLASH
CODE DTC NAME
“CHECK
TRANS"
P0560 25 System Voltage Error —
P0602 63 Transmission Control Module (TCM) Programming Error —
P0705 17 Transmission Range Sensor Circuit Malfunction ON
P0712 15 Transmission Oil Temperature Sensor Circuit Low Input ON
P0713 16 Transmission Oil Temperature Sensor Circuit Hight Input ON
P0717 14 Input Speed Sensor Signal Error ON
P0722 11 Output Speed Sensor Signal Error ON
P0743 33 Torque Converter Clutch Electrical ON
P0748 35 Pressure Control Solenoid Electrical ON
P0753 31 Shift Solenoid S1 Electrical ON
P0758 32 Shift Solenoid S2 Electrical ON
P1767 67 ECM CAN (Control Area Network) Invalid ON
P1790 61 Transmission Control Module ROM Checksum Error ON
P1791 62 Transmission Control Module RAM Error ON
U2104 65 CAN (Control Area Network) BUSS OFF ON

TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L) 7A2-49

DTC P0717 (FLASHING CODE 14) Input Speed Sensor Signal Error

MAW060MF001501

Circuit Description
Input revolution information is provided to TCM by the
input revolution sensor. This sensor is located in the
transmission case.
The input revolution sensor is an electromagnetic pulse
pickup type that generates a speed signal according to
the revolution of the transmission OD direct clutch
drum. As a result, the sensor sends a sine wave signal
(AC) to the TCM, which converts this sine wave signal
(pulse voltage) to a RPM signal.
Condition for setting the DTC
The TCM detects following conditions at 1000
times continuously.

When the TCM detects following conditions at the
same time.
 When output speed is over 775 rpm (16 mph) at
gear position is 1st or 2nd or 3rd.

Input speed signal is no pulse while output speed
signal are 12 pulses.

OR

When the TCM output 2nd gear.
 The TCM detects no pulse of input speed senso
r
circuit signal after 3.5 sec.
(detection time: 0.03 sec at vehicle speed is 36 mph)
Action Taken When The DTC Sets

No engine torque control.
 No line pressure control.

No lock-up control.

No slope control.

Check Trans ON.
 DTC stored.

No detect DTC P0722.
Conditions For Clearing The DTC

The DTC can be cleared from the TCM history by
using a scan tool.