power ISUZU TF SERIES 2004 Workshop Manual
[x] Cancel search | Manufacturer: ISUZU, Model Year: 2004, Model line: TF SERIES, Model: ISUZU TF SERIES 2004Pages: 4264, PDF Size: 72.63 MB
Page 3776 of 4264
7A3-20 ON-VEHICLE SERVICE (AW30 –40LE)
Down shift km/h (mph)
Range Throttle Opening 1
2 2
3 3
4
Fully opened 39
– 45 (24 – 28) 94 – 100 (58 – 62) 155 – 161(96 – 100)
Half throttle 21 – 27 (13 – 17) 50 – 56 (31 – 35) 95 – 101 (59 – 63) D
Fully closed 13 – 19 (8 – 12) 24 – 30 (15 – 19) 47 – 53 (29 – 33)
Fully opened 39 – 45 (24 – 28) 94 – 100 (58 – 62) —
Half throttle 21 – 27 (13 – 17) 50 – 56 (31 – 35) — 3
Fully closed 13 – 19 (8 – 12) 24 – 30 (15 – 19) —
Fully opened 39 – 45 (24 – 28) 94 – 100 (58 – 62) —
Half throttle 21 – 27 (13 – 17) 94 – 100 (58 – 62) — 2
Fully closed 13 – 19 (8 – 12) 94 – 100 (58 – 62) —
L — 39 – 45 (24 – 28) — —
“3rd START" mode
km/h (mph)
Derange, winter mode ON
OFF 32 – 38 (20 – 24)
Lock-Up Point Chart
(H2, H4)
(REAR AXLE RATIO: 4.555)
(RADIUS OF TIRE: 0.350m) km/h (mph)
Throttle Opening: 20 %
Lock-up ON Lock-up OFF
Range
A/T Mode
3rd 4th 3rd 4th
NORMAL 53 – 59 (33 – 37) 64 – 70 (40 – 43) 45 – 51 (28 – 32) 60 – 66 (37 – 41)
D POWER 78 – 84 (49 – 52) 81 – 87(50 – 54) 68 – 74 (42 – 46) 73 – 79 (45 – 49)
Lock-up points in 2nd are following figures regardless
of throttle opening, whether NORMAL or POWER
mode.
Lock-up ON: 73 – 79 km/h (45 – 49 mph)
Lock-up OFF: 68 – 74 km/h (42 – 46 mph)
Page 3952 of 4264
7A1-6 CONSTRUCTION AND FUNCTION
ELECTRONIC CONTROL COMPONENTS LOCATION
4WD Only 4WD Only
Instrument panel (Meter)
Speed meter (2WD Only)
Shift position indicator lamp
POWER DRIVE, 3rd START
indicator lamp
A/T OIL TEMP indicator lamp
CHECK TRANS indicator lam
p
Brake pedal
Brake Switch
Select lever
Power Drive
, 3rd Start select switch
Transmission Control Module (TCM)
Electrical source
Ignition
Battery voltage
Speed sensor
Turbine sensor
Inhibitor switch
ATF thermo sensor
High clutch oil pressure switch
2-4 brake oil pressure switch
Low & Reverse brake oil pressure
switch
Line pressure solenoid
Low clutch solenoid
High clutch solenoid
2-4 brake solenoid
Low & Reverse brake solenoid
Lock-up solenoid
Transmission
Transfer Control Module
Transfer
4L mode switch
Engine
Engine speed sensor
Throttle Position Sensor
Engine Control Module (ECM)
Data link connector
Page 3954 of 4264
7A1-8 CONSTRUCTION AND FUNCTION
STRUCTURE AND FUNCTION OF COMPONENT
TORQUE CONVERTER (WITH LOCK-UP FUNCTION)
The torque converter is a device for transmitting the engine torque to the transmission. It transmits power
by means of oil when the lock-up is disengaged and by means of a lock-up piston when it is engaged.
The torque converter is of the symmetrical, three-element, single-stage, two-phase type.
As shown in the drawing, the symmetrical three-elements refer to three elements (components) consisting
of impeller (1), turbine (2) and stator (3) that are arranged symmetrically (figure 5).
"Single-stage" means that there is only one turbine as an output element; "two-phase" means that the
pump impeller acts as a torque converter when the turbine speed is comparatively low, and as a fluid
coupling when the speed is high.
1. Pump Impeller
2. Turbine Runner
3. Stator
1. Pump Impeller
2. Turbine Runner
3. Stator
4. Converter Cover
5. One-way Clutch
6. Lock-up Piston
7. Torsion Damper
Figure 5. Torque Converter
Figure 6. Construction of Torque Converter
Lock-up mechanism
"Lock-up" refers to a fixed state of the lock-up piston inside the torque converter and thus connects the
engine directly to the transmission.
The hydraulic pressure for the lock-up control is supplied from two circuits.
When the lock-up is disengaged (Figure 7)
When the lock-up is disengaged, the torque converter operating pressure is supplied from the oil passage
(A) to between the cover and the lock-up piston, and separates the lock-up piston clutch facing and
converter cover.
As a result, the engine drive power is transmitted from the converter cover to the pump impeller, the ATF
and to the turbine. The torque converter function as a fluid connector in this condition.
The torque converter operating pressure is supplied from the oil passage (A), passes through the oil
passage (B).
When the lock-up is engaged (Figure 8)
When the lock-up is engaged, the torque converter operating pressure is supplied from oil passage (B) to
the oil pump impeller, turbine, then to the stator side. The oil between the lock-up piston and converter
cover is drained.
Since the force acting on the right side of the lock-up piston is greater than force on the left side, it
connects the lock-up piston clutch facing with the converter cover, thereby increasing the transmission
efficiency.
Page 3955 of 4264
CONSTRUCTION AND FUNCTION 7A1-9
Figure 7. Lock-up Control (Disengaged) Figure 8. Lock-up Control (Engaged)
OIL PUMP
The oil pump generating oil pressure is a small-size trochoid gear type oil pump. It feeds oil to the torque
converter, lubricates the power train mechanism, and feeds the oil pressure to the oil pressure control unit
under pressure.
The oil pump is located behind the torque converter. Sine the inner rotor in the oil pump is fitted with the
drive sleeve of the torque converter, it works by the power from the engine.
Figure 9. Construction of Oil Pump Figure 10. Location of Oil Pump
When the inner rotor in the oil pump rotates, ATF is sucked in from the oil pan, passed between the inner
rotor, outer rotor and crescent and discharged. This pressure discharged is sent to the pressure
regulator valve in the control valve and adjusted as required for operating the A/T. The flow rate under
pressure increases or decreases in proportion of the number of rotations.
Figure 11. Operation of Oil Pump
Page 3957 of 4264
CONSTRUCTION AND FUNCTION 7A1-11
The JR405E consists of two sets of planetary gears, which are called front planetary gear and rear
planetary gear.
The sun gear of front planetary gear is fixed to the drive plates of 2-4 brake and reverse clutch.
The planetary carrier of front planetary gear is fixed to the drum of low clutch, the drive plates of low &
reverse brake and the hub of high clutch.
The internal gear of front planetary gear and the planetary carrier of rear planetary gear are connected as
one, and they are fixed to output shaft.
The sun gear of rear planetary gear is fixed to input shaft.
The internal gear of rear planetary gear is fixed to the hub of low clutch.
Clutch and Brake
Basic structure of the clutch and brake is shown in the figures below.
In the figure A, the clutch plates (drive plate and driven plate) are in the fluid so that they slip against each
other transmitting no power.
Figure B shows the condition where the oil pressure is acting on the piston. The clutch plates are fitted
to each other under pressure transmitting the rotations of the clutch drum to the clutch hub.
When the oil pressure is removed from the piston, the clutch returns to the condition in the figure A by the
return spring.
Figure 13. Basic Construction of Clutch and Brake
Low Clutch, High Clutch and Reverse Clutch (Multi-Plate Clutch)
The multi-plate clutch is composed of drive plates and driven plates. By applying the oil pressure onto
the end surface of the plates, the clutch is engaged or disengaged. The oil pressure is adjusted with the
control valve according to the signal from the TCM.
All clutches use dish plates to prevent uncontrolled operation of the clutches when engaged, causing a
shock.
For the reverse clutch, a piston check ball is used to release the oil pressure for the purpose of preventing
the clutch drag due to oil pressure generated by residual ATF because of the centrifugal force while the
clutch is racing (under no oil pressure).
For the low clutch and high clutch, a centrifugal balance chamber always full of ATF is provided to offset
the excessive oil pressure, for the purpose of preventing the clutch drag due to oil pressure generated by
residual ATF because of the centrifugal force while the clutch is racing (under no oil pressure).
The solenoid in the control valve is driven based on the speed change signal from TCM and moves the
shift valve, thereby engaging the drive plate and driven plate through the piston of each clutch.
Resultantly, elements of the planetary gear unit are combined.
When the oil pressure is removed, the piston returns to the original position by the force of the return
spring.
Page 3960 of 4264
7A1-14 CONSTRUCTION AND FUNCTION
CONTROL VALVE
Employing the direct electronic control (Direct Electronic Shift Control: DESC) for the clutch pressure has
simplified the oil pressure circuit, reduced the number of functional components and made the control
valve compact.
The control valve body is divided into the upper body and lower body. All solenoids, oil pressure switch
and ATF thermo sensor are installed to the lower body.
Three-way valve type solenoids providing high responsibility are employed. Some of the solenoids are
switched between ON and OFF and others repeat ON and OFF at 50Hz (duty cycle system).
Functionally, some supply output pressure when power is not supplied and others drain the output
pressure.
When the solenoid is driven based on the signal from the TCM, the oil pressure is changed. The valve is
operated by the difference of the oil pressure.
Figure 22. Construction of Valve Body
Page 3961 of 4264
CONSTRUCTION AND FUNCTION 7A1-15
Line Pressure Solenoid
The line pressure solenoid is turned ON or OFF according to the signal from the TCM. It switches the
line pressure between high and low pressure.
While no power is supplied, the solenoid supplies high pressure.
Shift Solenoid
The shift solenoid is of the duty cycle type which are turned ON or OFF at 50Hz. The ratio of the ON and
OFF time can be freely controlled in the range of 0 - 100%.
While no power is supplied, the solenoid supplies output pressure.
The low clutch solenoid adjusts the low clutch pressure, the high clutch solenoid the high clutch pressure,
the 2-4 brake solenoid the 2-4 brake pressure and the low & reverse brake solenoid the low & reverse
brake pressure respectively.
Lock-up Solenoid
The lock-up solenoid is of the duty cycle type which is turned ON or OFF at 50Hz. The ratio of ON and
OFF time can be freely controlled in the range of 0-100%.
While no power is supplied, the solenoid drains the output pressure.
Figure 23. Shift Solenoid Figure 24. Lock-up Solenoid
Figure 25. Location of Solenoid
Page 3970 of 4264
7A1-24 CONSTRUCTION AND FUNCTION
BRAKE SWITCH
The brake switch is installed to the brake pedal. When the driver steps on the brake pedal, an electric
signal is sent to the TCM.
Brake Switch
Accelerator Pedal
Brake Pedal
TCM A3 +12V
Figure 45. Brake Switch Figure 46. Pin Assignment
MODE SELECT SWITCH
The mode select switch is installed beside the select lever. When the driver selects the PWR or 3rd, an
electric signal is sent to the respectively. It turns ON the indicator lamp in the meter.
The 3rd START mode can be used only in the D range.
Mode Select Switch
Gear Select Lever
Power 3rd Illumination
Lamp
1 (Illumination)
2 (Ground)
3 (TCM A24)
4 (No Connection)
5 (TCM A11)
6 (Ground)
21
65 4 3
Figure 47. Mode Select Switch Figure 48. Pin Assignment
Page 3971 of 4264
CONSTRUCTION AND FUNCTION 7A1-25
TRANSMISSION CONTROL MODULE (TCM)
The TCM is fitted side of brake pedal by means of two stud bolts.
The TCM judges necessary line pressure, gear shifting point and lock-up operation based on electrical
signals from switches and sensors and sends appropriate signals to solenoids.
Connect to White Connector Connect to Grey Connector
Figure 49. Pin Assignment
Pin No. Pin Assignment Pin No.Pin Assignment
B1 2-4 Brake Oil Pressure Switch A1 V BATT (Battery Back-up Power Supply)
B2 2 Range Switch A2 P Range Switch
B3 Turbine Sensor A3 Brake Switch
B4 ATF Thermo Sensor A4 3rd Start Indicator Lamp
B5 Ground A5 K-Line Signal (Tech 2 Serial Communication)
B6 Low & Reverse Brake Duty Solenoid A6 No Connection
B7 2-4 Brake Duty Solenoid A7 Engine Speed Sensor
B8 High Clutch Duty Solenoid A8 No Connection
B9 Low Clutch Duty Solenoid A9 No Connection
B10 N Range Switch A10 Vehicle Speed Sensor Out (2WD Only)
B11 D Range Switch A11 3rd START Select Switch
B12 Low & Reverse Brake Oil Pressure Switch A12 4L Mode Switch (4WD Only)
B13 Vehicle Speed Sensor A13 No Connection
B14 ATF Thermo Sensor Ground A14 No Connection
B15 Ground A15 No Connection
B16 No Connection A16 Throttle Position Sensor
B17 Lock-up Duty Solenoid A17 3 Range Switch
B18 Vign Ignition Power Supply) A18 DIAG Switch (Test Switch)
B19 R Range Switch A19 A/T OIL TEMP Indicator Lamp
B20 High Clutch Oil Pressure Switch A20 CHECK TRANS Indicator Lamp
B21 L Range Switch A21 POWER DRIVE Indicator Lamp
B22 Ground (Shift Solenoid) A22 No Connection
B23 Line Pressure Solenoid A23 No Connection
B24 Vign (Ignition Power Supply) A24 POWER DRIVE Select Switch
Page 3972 of 4264
7A1-26 CONSTRUCTION AND FUNCTION
CONTROL MECHANISM
CONTENT OF FUNCTION AND CONTROL
Item Description
Line pressure control TCM issues a signal according to the vehicle traveling, engine load and other conditions to
TCM and the ON/OFF type line pressure solenoid is driven to switch the line pressure to
high or low pressure.
The line pressure solenoid is switched to the low pressure side when the solenoid is turned
ON (power supplied) and to the high pressure side when turned OFF (no power supplied).
In the forward travel range (D, 3, 2, L range), the line pressure decreases lower than that in
the P, N, and R range through the oil pressure circuit for the forward travel range.
Gear shift control The TCM issues a shift solenoid drive signal based on the traveling mode switch, inhibitor
switch, vehicle speed, throttle opening and other input signal to control the optimum gear
position automatically.
Speed change features have been set up to the TCM; the normal mode is suited to usual
traveling and the power mode is appropriate when the vehicle is loaded or accelerates the
speed.
In addition, speed change features used only for high oil temperature, hill climbing, and
down have been set up to the TCM, which are automatically switched depending on the
traveling conditions.
When the oil temperature is low (below 10C), speed change from the third to the fourth
speed is prohibited by the gear shift control.
Shift pattern selection
control
According to a vehicle condition, the TCM selects the following shift pattern.
Selection Priority Shift Pattern 3rd Start Lamp Power Drive Lamp
High High Temperature OFF OFF
3rd Start ON
4L
Power SW Off
OFF
Down Slop Power SW On
Power ON
Up Slope
Low Normal
OFF
OFF
- High temperature mode -
High temperature mode setting condition
ATF temperature: More than 123C
Above condition is met for more than 10 seconds.
High temperature mode cancel condition
ATF temperature: Less than 116C
Above condition is met for more than 10 seconds.
- 3rd start mode -
3rd start mode setting condition
3rd start switch: On Off (Pushed)
Vehicle speed: Less than 11km/h
ATF temperature: Less than 115C
Throttle position: Less than 8%
Select lever position: D range
Above conditions are met at the same time.
3rd start mode reset condition
3rd start switch: On Off again(Pushed again)
Vehicle speed: More than 34km/h
Select lever position: Other than D range
At least, one of above conditions is met.