oil ISUZU TF SERIES 2004 Workshop Manual

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

TCM Voltage & Resistance Check Sheet
CHECK ITEM PIN No. VALUE NOTE
VIGN A6 –A1 VIGN
Key “ON ”

A6 –A23 VIGN
Key “ON ”
Backup Power Supply A24 –A1 +B (Always)
Key “ON ”
Inhibitor (Select) SW P B20 –A1 “P ” Range VIGN Key “ON ”

Except “P ” 0V
Inhibitor (Select) SW R B1
–A1 “R ” Range VIGN Key “ON ”

Except “R ” 0V
Inhibitor (Select) SW N B8
–A1 “N ” Range VIGN Key “ON ”

Except “N ” 0V
Inhibitor (Select) SW D B7
–A1 “D ” Range VIGN Key “ON ”

Except “D ” 0V
Inhibitor (Select) SW 2 B19
–A1 “2 ” Range VIGN Key “ON ”

Except “2 ” 0V
Inhibitor (Select)SW 1 B18
–A1 “1 ” Range VIGN Key “ON ”

Except “1 ” 0V
Inhibitor (Select) SW 3 B9
–A1 “3 ” Range VIGN Key “ON ”

Except “3 ” 0V
Power SW B13
–A1 ON 0V Key “ON ”

OFF VIGN
3rd Start SW B4
–A1 ON 0V Key “ON ”

OFF VIGN
Brake SW B22
–A1 ON VIGN Key “ON ”

OFF 0V
AT Oil Temperature
Sensor A11
–A12 20
C 4.6V Engine run.

155

C 1.1V
4L Signal B21
–A1 4L 0V Key “ON ”

2H/4H VIGN
Diag SW B12
–A1 ON VIGN Key “ON ”

OFF 0V
Shift Solenoid A (S1) A16
–A1 P VIGN Engine run.

R VIGN

N VIGN

D –1 VIGN

D –2 VIGN

D –3 0V

D –4 0V

7A2-8 TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L)

CHECK ITEM PIN No. VALUE NOTE
Shift Solenoid B (S2) A15 –A1 P 0V Engine run.

R 0V Engine run. (Without the
Reverse range lock out)
N 0V Engine run.
D –1 0V

D –2 VIGN

D –3 VIGN

D –4 0V
Lock-up Solenoid A5
–A1 ON VIGN (ex.) It is “ON ” when the
vehicle speed is more than
65km/h.
OFF 0V
Check Trans Lamp B3
–A1 ON 0V Key “ON ”
(The lamp is “ON ” for 3
second after key “ON ”)

OFF VIGN
AT Oil Temperature Lamp B11
–A1 ON 0V Key “ON ”
(The lamp is “ON ” for 3
second after key “ON ”)

OFF VIGN
Power Lamp B2
–A1 ON 0V Key “ON ”
(The lamp is “ON ” when the
Power switch is “ON ”)

OFF VIGN
3 rd Start Lamp B10
–A1 ON 0V Key “ON ”
(The lamp is “ON ” when the
3rd Start switch is “ON ”)

OFF VIGN
AT Oil Temp Sensor
Resistance A11
–A12 20

C
12k
Key “OFF ”

50

C 1.5k

155

C 293

Pressure Control Solenoid
Resistance A4
–A2 About
4 –7

(20

C)
Key “OFF ”
Speed Sensor Resistance B5 –B14 About
560

– 120
(20

C)
Key “OFF ”
Input Revolution Sensor
Resistance B6
–B16 About
560

– 120
(20

C)
Key “OFF ”
Lock-up Solenoid
Resistance A5
–A1 About
10

– 15
(20

C)
Key “OFF ”
Shift Solenoid A (S1)
Resistance A16
–A1 About
10

– 15
(20
C)
Key “OFF ”
Shift Solenoid B (S2)
Resistance A15
–A1 About
10

– 15
(20

C)
Key “OFF ”

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.

TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L) 7A2-11

Comparison of mode
1. The normal drive mode is set at the normal shift
points.
2. The shift points of the power drive mode are shifted
to the higher speed side, compared to the normal
drive mode.
3. The 3rd start mode is a special mode used
exclusively for starting in third gear.
3rd start Mode
1. The 3rd start switch will operate when switched on
after all of the following conditions are present:
a. The gear select position is “D" range only.
b. Vehicle speed is 11 km/h (7 mph) or less.
c. Transmission oil temperature is 120

C (248

F)
or less.
d. Accelerator opening is at 8% or less.
2. Cancel Release
1. Cancellation by driver
a. Turning off the 3rd start mode switch
b. Shifting select position to “3", “2", or “L" (3rd
start mode is not canceled by selecting “N",
“ R", or “P")
c. Ignition key is turned off.
2. Automatic cancellation
a. When vehicle runs at 34 km/h (21mph) o
r
more for 1 second or more
b. When transmission oil temperature reaches 120

C (284

F) or above
NOTE: The mode returns to normal drive mode o
r
power drive mode after the 3rd start mode is canceled.
Backup Mode
If a major system failure occurs which could affect
safety or damage the transmission under normal
vehicle operation, the diagnostic system detects the
fault and overrides the Transmission Control Module
(TCM).
The “CHECK TRANS" light flashes to alert the driver,
and the transmission must be manually shifted as
follows:


Select lever position Gear Ratio Selected
D 4 (Fourth)
Manual 3 4 (Fourth)
Manual 2 3 (Third)
Manual L 3 (Third)
R Reverse
Shifts are firmer to prevent clutch slip and consequent
wear. The fault should be corrected as soon as
possible.

7A2-12 TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L)

Functions of Input / Output Components
Component Function
Transfer low signal Detects the transfer High/Low position.
OD Cancel signal Detects whether the cruise control unit is judged OD cancel mode.
Output revolution sensor
(Transmission) Detects the vehicle speed.
Input revolution sensor
(Transmission) Detects the input revolution (OD direct clutch drum revolution).
Engine revolution sensor Detects the engine revolution with CAN.
Throttle position signal Detects the throttle opening rate with CAN.
Neutral start switch Detects the select lever position.
Pattern select switch Detects whether the driver has selected "NORMAL" or "POWER" mode.
Brake lamp switch Detects whether the driver has pressed the brake pedal or not.
Oil temperature sensor Detects the oil temperature.




I
n
p
u t
Diagnostic start switch Starts self-diagnosis and displays a code for faulty part if any.
I
n
p
u t
/
O
u t
p
u t Data link connector When connected with Tech2 or tester, can communicate the data for function
check, etc.
Shift solenoid S1, S2 Selects shift point and gear position suited to the vehicle running condition on the
basis of TCM output.
Lock-up control solenoid SL Control the lock-up clutch suited to the vehicle running condition on the basis of TCM output.
Pressure control solenoid
STH Adjusts throttle pressure by energizing current of linear pressure control solenoid
to prevent the shift shock and to obtain shift smoothly.
"CHECK TRANS" lamp When trouble has occurred to throttle position sensor, vehicle speed sensor, or
solenoid, "CHECK TRANS" lamp is blinked to warn the driver. If also displays the
trouble code.
A/T OIL TEMP warning
lamp Lights when ATF oil temperature rises. (Turned on at greater than 146


C
(295

F). Turned off at less than 132

C (270

F).
POWER lamp Lights when POWER MODE detected.



O
u
t
p
u
t
3rd Start lamp Lights when 3rd Start MODE detected.
C
o
m
p
u t
e r Transmission Control
Module (TCM) Based on the signal from each switch and sensors, judges necessary shift point
and lock-up operation, and send signal to each solenoid.

7A2-20 TRANSMISSION CONTROL SYSTEM (AW30 –40LE) (V6 3.5L)




RTW37ALH000101

Once the test vehicle has been identified an
“ Application (Powertrain) Menu" screen appears.
Please select the appropriate application.
The following table shows, which functions are used fo
r
the available equipment versions.



F0: Diagnostic Trouble Codes

F0: Read DTC Info As stored By ECU

F1: Clear DTC Information

F2: DTC Information
F1: Data Display
F2: Snap Shot
F3: Miscllaneous Tests

F0: Lamps

F0: Power Lamp Test
F1: 3rd start Lamp Test
F2: AT Oil Temperature Lamp
F3: Check Light
F1: Solenoids

F0: Shift solenoid A (S1)
F1: Shift Solenoid B (S2)
F2: Pressure Control Solenoid (PCS)

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

7A2-34 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) 7A2-43

DTC P0712 (FLASHING CODE 15) Transmission Oil Temperature Sensor
Circuit Low Input

RTW37AMF000201
Circuit Description
The oil temperature sensor is a thermistor sensor that
is installed in the transmission case and converts
temperature changes into continuous electric signals,
then outputs them to the Transmission Control Module
(TCM). When the ATF temperature is low, the
resistance of the sensor (thermistor) goes up, so that
the voltage of the TCM signal becomes high.
As the ATF is gradually warmed, the resistance of the
sensor goes down and the voltage becomes low. At the
normal operating ATF temperature (80

C/176

F) of the
transmission, the voltage of the TCM is about 3.7V.
Condition for setting the DTC

The TCM detects following "Condition" for 5 min
continuously.
Condition ("Short"):

Oil temperature is more than 220

C (428

F).

Action Taken When The DTC Sets

The TCM judges oil temperature is 100

C (212

F).
 Check Trans ON.

DTC stored.
Conditions For Clearing The DTC

The DTC can be cleared from the TCM history by
using a scan tool.
 The DTC will be cleared from history when the
vehicle has achieved 40 warm-up cycles without a
failure reported.

After more than 1 second has elapsed after the
ignition key has been turned “ON", short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.

7A2-44 TRANSMISSION CONTROL SYSTEM (AW30–40LE) (V6 3.5L)

Diagnostic Aids

Inspect the wiring for poor electrical connection at
the TCM. Look for possible bent, backed out,
deformed or damaged terminals. Check for weak
terminal tension as well. Also check for a chafed wire
that could short to bare metal or other wiring. Inspect
for a broken wire inside the insulation.

When diagnosing for a possible intermittent short o
r
open condition, move the wiring harness while
observing test equipment for a change.
 Check oil temperature sensor for proper mounting
and adjustment.



DTC P0712 (FLASHING CODE 15) Transmission Oil Temperature Sensor
Circuit Low Input


Step Action Value(s) YES NO
1
Was the powertrain On-Board Diagnostic (OBD)
System Check performed? — Go to Step 2 Go to OBD
System Check
2 Perform the transmission fluid checking procedure.
Refer to checking Transmission Fluid level and
Condition in Automatic Transmission 7A section.
Was the fluid checking procedure performed ? — Go to Step 3 Refer to
Checking
Transmission
Fluid level and
Condition in
Automatic
Transmission
(AW30-40LE)
section
3

1. Install the scan tool.

2. Key “ON"
3. Review and record scan tool data.

4. Operate the vehicle with in scan tool data.
Does the scan tool indicate DTC P0712 ? — Go to Step 4 Refer to
Diagnostic Aids
4 Measure the voltage of the transmission fluid
temperature sensor by the J39200 DMM.

1. Key “OFF".
2. Disconnect the oil temperature sensor connector.

3. Key “ON".

4. Connect the J39200 DMM to the each terminal of
the oil temperature sensor connector E83-2 and
E83-1.
Does the scan tool indicate less than specified
value ? 5V Go to Step 5 Go to Step 6
5 Replace the transmission fluid temperature sensor.
Is the action complete ? — Verify repair —