2004 ISUZU TF SERIES transmission

7A2-6 DIAGNOSIS (JR405E)
BASIC TROUBLE SHOOTING

Transmission fluid pressure together with clutch and brake friction and other important transmission functions are
controlled by electrical signal from the Transmission Control Module (TCM).
Random diagnosis can produce inaccurate and misleading indications. It is important that diagnosing procedure be
carried out systematically.
Carefully follow the sequence outlined below to diagnose automatic transmission assembly.




Verify Customer Complain
Preliminary Check
(Visual Check/Test Drive)
Compare to Same Model
(If Available)
Check Service Bulletin
DTC Check
(Self-diagnosis/Tech 2)
Go to Symptom Diagnosis
Stall Test
Line Pressure Test
Transmission Overhaul
Repair & Verify Fix
Transmission Overhaul
Transmission Overhaul
Go to DTC Chart
Go to Intermittent Diagnosis NG
Follow the instructions
NG
No Instruction
NG
OK
NO DTC
Not Solved
OK
OK
Follow the Bulletin
(Once Clear Memory) Restored
Not Stored
Use Service Programming
System (SPS)
Not Solved

DIAGNOSIS (JR405E) 7A2-9
DIAGNOSIS WITH TECH 2
In this JR405E transmission, troubleshooting can be performed for electrical faults using the Tech 2 scan tool.
If the "CHECK TRANS" lamp blinks, or if an electrical fault in the transmission may probably exit, check trouble
codes using the Tech 2 scan tool.
In the diagnostic procedures described in this manual, first repair the faulty positions indicated by trouble code in
order of numbers and then perform troubleshooting for the faulty positions that are not indicated by trouble code.
For correct troubleshooting, it is necessary to first repair the trouble codes of lower order numbers, then to repair
the trouble codes of higher order numbers in sequence.

If no codes are set:

Refer to F1: Data Display and identify the electrical faults that are not indicated by trouble code.

Refer to "SYMPTOM DIAGNOSIS".

If codes are set:
1. Record all trouble codes displayed by Tech 2 and check id the codes are intermittent.
2. Clear the codes.
3. Drive the vehicle for a test to reproduce the faulty status.
4. Check trouble codes again using the Tech 2.
5. If no codes is displayed by test driving, the fault is intermittent. In this case, refer to "INTERMITTENT
DIAGNOSIS".
6. If a code is present, refer to DTC Chart for diagnosis.
7. Check trouble codes again using the Tech 2.





TECH 2 CONNECTION
Tech 2 scan tool is used to electrically diagnose the automatic
transmission system and to check the system. The Tech 2
enhances the diagnosis efficiency though all the
troubleshooting can be done without the Tech 2.
1. Configuration of Tech 2

Tech 2 scan tool kit (No. 7000086), Tech 2 scan tool
(No. 7000057) and DLC cable (No. 3000095).

SAE 16/19 adapter (No. 3000098) (1), RS232 loop back
connector (No. 3000112) (2) and PCMCIA card (No.
3000117) (3).




2. Tech 2 Connection

Check the key switch is turn OFF.

Insert the PCMCIA card (1) into the Tech 2 (4).

Connect the SAE 16/19 adapter (2) to the DLC cable (3).

Connect the DLC cable (3) to the Tech 2 (4).

Connect the SAE 16/19 adapter (2) to the data link
connector of the vehicle.

Turn the key switch of the vehicle ON and press the
"PWR" key of the Tech 2.

Check the display of the Tech 2.

7A2-12 DIAGNOSIS (JR405E)
F0: Diagnostic Trouble Code
F0: Read DTC Infor As Stored By ECU
F1: Clear DTC Information
F1: Data Display
F2: Snapshot
F3: Miscellaneous Test
F0: Lamp
F0: Power Lamp Test
F1: 3rd Start Lamp Test
F2: AT Oil Temperature Lamp Test
F3: Transmission Check Light Test
F1: Solenoids
F0: Low & Reverse Brake Solenoid
F1: 2-4 Brake Solenoid
F2: High Clutch Solenoid
F3: Low Clutch Solenoid
F4: Line Pressure Solenoid
F5: Lock Up Duty Solenoid
F4: Programming
F0: Program VIN
F1: Lock ECU

F0: Diagnostic Trouble Code
The purpose of the "Diagnostic Trouble Codes" mode is to
display stored trouble code in the TCM.
When "Clear DTC Information" is selected, a "Clear DTC
Information", warning screen appears. This screen informs you
that by cleaning DTC's "all stored DTC information in the TCM
will be erased".
After clearing codes, confirm system operation by test driving
the vehicle.

F1: Data Display
The purpose of the "Data Display" mode is to continuously
monitor data parameters.
The current actual values of all important sensors and signals
in the system are display through F1mode.
See the "Typical Scan Data" section.

F2: Snapshot
"Snapshot" allows you to focus on making the condition occur,
rather than trying to view all of the data in anticipation of the
fault. The snapshot will collect parameter information around a
trigger point that you select.

F3: Miscellaneous Test:
The purpose of "Miscellaneous Test" mode is to check for
correct operation of electronic system actuators.

F4: Programming (Factory Use Only):
The purpose of "Programming" is to program VIN in the ECM
and lock the programmed data.

7A2-14 DIAGNOSIS (JR405E)
MISCELLANEOUS TEST
The state of each circuit can be tested by using miscellaneous test menus. Especially when DTC cannot be
detected, a faulty circuit can be diagnosed by testing each circuit by means of these menus.
Even DTC has been detected, the circuit tests using these menus could help discriminate between a mechanical
trouble and an electrical trouble.

Connect Tech 2 and select "Powertrain", "JR 405E" & "Miscellaneous Test".
F0: Lamps
The circuit is normal if the warning light in the meter panel comes on and goes out in accordance with Tech 2
instruction.

Lamps

F0: Power Lamp Test
F1: 3rd Start Lamp Test
F2: AT Oil Tempeature Lamp Test
F3: Transmission Check Light Test


F0: Power Lamp Test


Power Lamp Test

Power Lamp Off



 Press "Active" key.
Then, "POWER DRIVE" indicator lamp is turned on in the meter panel.
 Press "Inactive" key.
Then, "POWER DRIVE" indicator lamp is turned off in the
meter panel.
 Press "Quit" Key to cancel the test.
F1: 3rd Start Lamp Test
F2: AT Oil Temperature Lamp Test
F3: Transmisstion Check Light Test
Test procedure is same as "F0: Power Lamp Test".
The circuit is normal if the warning light in the meter panel
comes on and goes out in accordance with Tech 2 instruction.

F1: Solenoids
The circuit is normal if clicking sound is generated in accordance with Tech 2 instruction.

Solenoids
F0: Low & Reverse Brake Solenoid
F1: 2-4 Brake Solenoid
F2: High Clutch Solenoid
F3: Low Clutch Solenoid
F4: Line Pressure Solenoid
F5: Lock Up Duty Solenoid

DIAGNOSIS (JR405E) 7A2-15
F0: Low & Reverse Brake Solenoid

Low & Reverse Brake Solenoid

Low & Reverse Brake Duty 0%



 Press "Active" key.
Then, duty datio is indicated 100 % and "clicking sound" is
generated from the transmission control valve.
 Press "Inactive" key.
Then, duty datio is indicated 0 % and "clicking sound" is
generated from the transmission control valve.
 Press "Quit" Key to cancel the test.

F0: Low & Reverse Brake Solenoid
F1: 2-4 Brake Solenoid
F2: High Clutch Brake Solenoid
F3: Low Clutch Solenoid
F4: Line Pressure Solenoid
F5: Lock Up Duty Solenoid

Test procedure is same as "F0: Low & Revese Brake
Solenoid"
The circuit is normal if clicking sound is generated in
accordance with Tech 2 instruction.

7A2-22 DIAGNOSIS (JR405E)


6. If you select “continue”, you have to select “Model Year”, “Vehicle Type”.
7. After that, push button and turn Ignition switch tuned on, off, on following Tech-2 display. Tech-2 will read
information from controller after this procedure.
8. During obtaining information, Tech-2 is receiving information from the control unit ECM and TCM at the same
time. With VIN not being programmed into the new control unit at the time of shipment, "obtaining
information" is not complete (because the vehicle model, engine model and model year are specified from
VIN). For the procedure get additional information on vehicles, instruction will be provided in dialog form,
when TIS2000 is in operation.
9. Following instructions by Tech-2, push the "Exit" switch of Tech-2, turn off the ignition of the vehicle and turn
off the power of Tech-2, thereby removing from the vehicle.


3. Data Exchange
1. Connect Tech-2 to P/C, turn on the power and click the "Next" button of P/C.
2. Check VIN of the vehicle and choose "Next".
3. Select “Transmission” in the “System Type” selection.
4. When a lack of data is asked from among the following menu, enter accordingly.
Select following Menu

Model Year

Model

Engine type

Destination code (vehicles for general export)*1

* 1: How to read the destination code:
Destination code can be read from service ID Plate affixed on vehicle, while on service ID Plate the destination
code is described at the right-hand edge of Body Type line. In the figure, the destination code can be read as "RR3"
for Australia.

DIAGNOSIS (JR405E) 7A2-77
Step Action Yes No
6 Is the quantity of ATF correct?
Go to Step 7
Correct the quantity of
ATF.
Go to Step 9
7 Connect the Tech 2 and test the solenoids of respective
solenoids for low & reverse brake, 2-4 brake, high clutch and
low clutch. Is operation sound heard from each solenoid?
Go to Step 8
Replace the solenoid
that does not generate
the operation sound.
Go to Step 9
8 Check the line pressure during the idling and at the engine stall
speed. Is the line pressure correct?
Go to Step 10
Either control valve, oil
pump or power train
parts (clutch, brake)
will be faulty. Replace
or overhaul the
transmission unit.
Go to step 10
9 Run the vehicle, and is the gear shifted from 1st to 4th
correctly?
Go to Step 10
Either control valve, oil
pump or power train
parts (clutch, brake)
will be faulty. Replace
or overhaul the
transmission unit.
Go to step 10
10 Clear the DTC from the memory and perform the work after
repair. Is the same DTC code outputted again in the
subsequent DTC check?
Replace the TCM Go to Step 11
11 Are the other DTCs outputted?
Go to Other DTC
Section Action is completed

DIAGNOSIS (JR405E) 7A2-89
Symptom Condition Description
Faulty during the
running Low maximum speed or poor acceleration Starting acceleration is poor. F1
Acceleration is slow though the accelerator
pedal is stepped on during the running.
Engine races up during acceleration (slip)
The engine speeds up but vehicle speed
does not increase when the accelerator
pedal is stepped on at the starting.
F2

Only the engine speeds up but vehicle
speed does not increase when the
accelerator pedal is stepped on for
acceleration during the running.

Noise or vibration during the running in R, D,
3, 2, or L range
Noise or vibration is generated in the vicinity
of AT during the running. F3
Engine brake does not in apply L range
The engine brake does not apply, allowing
the vehicle to run freely when the
accelerator pedal is released at low speed in
L range.
F4
Engine stalls before vehicle stops from
running
The engine stalls simultaneously with the
vehicle stop when the brake pedal is
stepped on to stop the vehicle during the
running.
F5
Faulty in the
stopping
Vehicle moves in P range, or parking gear is
not disengaged other than P range
Vehicle moves though it stops at a slope
and P range is selected. G1

The engine stalls and vehicle does not move
though other than P range is selected and
the accelerator pedal is stepped on.

Creep force is large
Vehicle accelerates in D, 3, 2, L, and R
ranges though the accelerator pedal is not
stepped on.
G2
Creep force is small Vehicle does not move though a run range
is selected on a flat road during the idling. G3
Large noise during idling with the vehicle in
stop state
The transmission is noisy during the idling
speed in all ranges. G4
Faulty lock-up Judder occurs at the lock-up The vehicle body judders at lock-up. H1
Large lock-up shock Large shock is felt at lock-up. H2
Lock-up point is high or low Lock-up point is excessive high or low. H3
No lock-up No lock-up Lockup is not performed in spite of the lock-
up area. I1