2004 ISUZU TF SERIES 4WD

CONSTRUCTION AND FUNCTION 7A1-35
CONTROL CIRCUIT BLOCK DIAGRAM



Speed sensor
Turbine sensor
Brake switch
Inhibitor switch
Power drive, 3rd start
switch
ATF oil thermo sensor
High clutch oil pressure
switch
2-4 brake oil pressure
switch
Low & reverse brake oil
pressure switch
Transfer control module
(4WD Only)



Engine Control Module
(ECM)
Line pressure solenoid
Low clutch solenoid
High clutch solenoid
2-4 brake solenoid
Low & reverse brake
solenoid
Lock-up solenoid
ATF temperature
indicator lamp
Speed meter (2WD
Only)
Power, 3rd start indicator
lamp
Check trans indicator
lamp
Data link connector Self-diagnosis
function



Transmission
Control
Module
(TCM)
4L mode
Engine
speed
Throttle
angle
Figure 54. Control Circuit Block Diagram

DIAGNOSIS (JR405E) 7A2-155
No. Wire
Color Pin Name Input /
OutputConnected toMeasurement
Item Measurement
Condition StandardInspection
Point at
Trouble
Related
harness
Engine
Speed
Sensor A7 BLK/
RED Engine Speed Sensor Input ECM Voltage (Wave
form) At 2000rpm.
Circuit tester
(+) to A7 pin,
(-) to B5 pin. Pulse
generated (At
AC range
approx. 6.2V)
ECM
A8 - - - - - - - -
A9 - - - - - - - -
Related
harness
Speed
sensor
Speed meter
A10 BLK/
YEL Vehicle Speed Sensor Out (2WD Only) Output Speed meter Voltage (Wave
form) At run in L
range in 1st
gear 20 km/h.
Circuit tester
(+) to A10 pin,
(-) to B5 pin. Pulse
generated (At
AC range
approx. 6.5V)
TCM
At switch
pushed Less than 2VRelated
harness
A11 GRN/
WHT 3rd Start Select Switch Input 3rd start switch Voltage
At switch off 10 – 14.5V 3rd start
switch
At 4L Less than 2VRelated
harness
A12 BLU/
WHT 4L Mode Switch (4WD Only) InputTransfer control
unit Voltage
At other than
4L 10 – 14.5V 4L switch
A13 - - - - - - - -
A14 - - - - - - - -
A15 - - - - - - - -
At fully close Off duty 10%Related
harness
ECM A16 RED/
WHT Throttle Position Sensor Input ECM Wave form
(140Hz Duty
signal) *1
At fully open Off duty 90%Throttle
position
sensor
At 3 range 10 – 14.5V Related
harness
A17 BLK/
GRN 3 Range Switch Input Inhibitor switch Voltage
At other than
3 range Less than 2VInhibitor
switch
At key switch
ON 10 – 14.5V Related
harness
A18 YEL/
BLK DIAG Switch InputData link
connector Voltage
At short circuit
of DIAG
switch Less than 2VRelated
harness
At lamp OFF 10 – 14.5V Related
harness A19 ORG/
BLU A/T OIL TEMP Indicator Lamp OutputAT OIL TEMP
indicator lamp Voltage
At lamp ON Less than 2V Lamp
At lamp OFF 10 – 14.5V Related
harness A20 GRN/
YEL CHECK TRANS Indicator Lamp OutputCHECK TRANS
indicator Lamp Voltage
At lamp ON Less than 2V Lamp
At lamp OFF 10 – 14.5V Related
harness A21 PNK POWER DRIVE Indicator Lamp OutputPOWER DRIVE
indicator lamp Voltage
At lamp ON Less than 2V Lamp
A22 - - - - - - - -
A23 - - - - - - - -

7A4-8 UNIT REPAIR (JR405E)

25ASSY019



Remove the 2-4 brake retainer and return spring.



26ASSY026

14.Carrier assembly (Carrier and low clutch assembly),
bearing, bearing race, and 2 – 4 brake assembly

Pull the carrier assembly, the bearing, the bearing race
and the 2-4 brake assembly (Dish plate, retaining plate,
drive plate, and driven plate) from the transmission case
at the same time.

Remove the bearing, the bearing race, and the 2-4
brake assembly from the carrier assembly.



27U-SPG02



Remove the 3 brake springs from the transmission case.



28L&R06

15.Low and reverse brake

Remove the snap ring.

Pull the low and reverse brake free.


16.Rear extension (2WD) or Adapter case (4WD)

Rotate the transmission case so that the oil pan opening
is facing up.

Remove the 10 bolts and the rear extension (2WD) o
r
the adapter case (4WD).

7A4-80 UNIT REPAIR (JR405E)

40ASSY091



Push the output shaft into place.


19.Rear extension (2WD) or adapter case (4WD)

Use the oil seal installer to install the oil seal to the rea
r
extension (2WD) or adapter case (4WD).
Oil seal installer:
5-8840-2769-0 (2WD)
5-8840-2770-0 (4WD)

41ASSY096



Install the bearing (with bearing race) to the rear
extension (2WD) or adapter case (4WD).
NOTE:







The black side (bearing race) of the bearing must be
visible.







Apply Vaseline to the bearing.




249L300005



Apply sealing agent (TB1216B) to the rear extension
(2WD) or adapter case (4WD) contact surfaces.



249L300006

Install the rear extension (2WD) or adapter case (4WD)
to the transmission case and tighten the 10 bolts to the
specified torque.
Torque: 53 N 


m (39 Ib 


ft)