2004 ISUZU TF SERIES brake

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

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.

DIAGNOSIS (JR405E) 7A2-33
DIAGNOSIS TROUBLE CODE TABLE

Flash Code
(P-Code)

CHECK TRANS Flash Pattern

Description
CHECK
TRANS
Warning

11 (P0722) Vehicle Speed Sensor No Signal ON


12 (-) Normal -


13 (P0727) ON

Engine Revolution Sensor No
Signal

14 (P0717) Turbine Speed Sensor No Signal ON


15 (P0710) ATF Temperature Sensor FailureOFF


16 (P0560) System Voltage Failure ON


17 (P0705) Inhibitor Switch Failure ON


22 (P1120) Throttle Signal Failure ON


25 (P1875) GND Return Circuit Failure ON


26 (P1853) ON

Low & Reverse Brake Pressure
Switch Failure

27 (P1858) 2-4 Brake Pressure Switch FailureON


28 (P1863) ON

High Clutch Pressure Switch
Failure

31 (P0753) ON

Low & Reverse Brake Duty
Solenoid Failure

32 (P0758) 2-4BrakeDutySolenoidFailure ON


33 (P0763) ON
High Clutch Duty Solenoid Failure

7A2-34 DIAGNOSIS (JR405E)


Flash Code
(P-Code)

CHECK TRANS Flash Pattern

Description
CHECK
TRANS
Warning

34 (P0768) Low Clutch Duty Solenoid FailureON


35 (P0748) Line Pressure Solenoid Failure ON


36 (P1860) Lock-up Duty Solenoid Failure ON


41 (P0731) 1stGearRatioError ON


42 (P0732) 2ndGearRatioError ON


43 (P0733) 3rdGearRatioError ON


44 (P0734) 4thGearRatioError ON


51 (P1750) ON

Low & Reverse Brake Fail-safe
Valve Failure

52 (P1755) 2-4BrakeFail-safeValveFailure ON


- (P0602) No Flash Code ECU Programming Error ON

DIAGNOSIS (JR405E) 7A2-35
FAIL-SAFEFUNCTION
Fail-Safe Condition
Flash Code
(P-Code)

Description
CHECK
TRANS
Warning

Gear Shift
Solenoid
Line
Pressure
Solenoid

Lock-up

Remark
11
(P0722)
Vehicle peed Sensor No
Signal ON 3rdFix All Stop - Inhibited
13
(P0727)
Engine Revolution Sensor
No Signal ON - - - Inhibited
14
(P0717)
Turbine Speed Sensor No
Signal ON 3rdFix All Stop - Inhibited
15
(P0710)
ATF Temperature Sensor
Failure OFF 3,2,L - - Inhibited*1
16
(P0560)
System Voltage Failure ON 3rdFix All Stop - Inhibited*2
17
(P0705)
Inhibitor Switch Failure ON 3rdFix All Stop - Inhibited
22
(P1120)
Throttle Signal Failure ON 3rdFix All Stop - Inhibited
25
(P1875)
GND Return Circuit
Failure ON 3rdFix All Stop - Inhibited*2
26
(P1853)
Low & Reverse Brake
Pressure Switch Failure ON No Fail-safe Function
27
(P1858)
2-4 Brake Pressure
Switch Failure ON No Fail-safe Function
28
(P1863)
High Clutch Pressure
Switch Failure ON No Fail-safe Function
31
(P0753)
Low & Reverse Brake
Duty Solenoid Failure ON 3rdFix All Stop - Inhibited
32
(P0758)
2-4 Brake Duty Solenoid
Failure ON 3rdFix All Stop - Inhibited
33
(P0763)
High Clutch Duty Solenoid
Failure ON 3rdFix All Stop - Inhibited
34
(P0768)
Low Clutch Duty Solenoid
Failure ON 3rdFix All Stop - Inhibited
35
(P0748)
Line Pressure Solenoid
Failure ON - - Stop -
36
(P1860)
Lock-up Duty Solenoid
Failure ON - - - Inhibited
41
(P0731)
1stGearRatioError ON No Fail-safe Function
42
(P0732)
2ndGearRatioError ON No Fail-safe Function
43
(P0733)
3rdGearRatioError ON No Fail-safe Function
44
(P0734)
4thGearRatioError ON No Fail-safe Function
51
(P1750)
Low & Reverse Brake
Fail-safe Valve Failure ON 3rdFix All Stop - Inhibited
52
(P1755)
2-4 Brake Fail-safe Valve
Failure ON 3rdFix All Stop - Inhibited
-
(P0602)
ECU Programming Error ON No Fail-safe Function
*1: When the engine speed is more than 470 rpm for 10 minuets, the lock-up and gear shift to 4th (over-drive) are
allowed.
*2: In case of fail-safe valve failure, gear shift to 4th (over-drive) is inhibited.

DIAGNOSIS (JR405E) 7A2-47
DTC P1875 (Flash Code 25) GND Return Circuit Failure
Control Valve



TCM

B6




B7



B8



B9


B22 (GND)
BLU/BLK
WHT/BLU
L&R Brake Solenoid

Terminal
Assembly
BLK/YEL
RED 2-4 Brake Solenoid


High Clutch Solenoid


Low Clutch Solenoid


E54
(5)

(9)


(10)


(3)

(11) H23 (11)




(5)


(7)



(2)

(1)
GRY/REDC95
(6)




(7)


(8)



(9)

(22)

BLU/BLK
BLK/YEL RED
WHT/BLU
GRY/RED



Setting Condition:

Ground return circuit is failed 7 times continuously after the low & reverse brake duty solenoid output signal turn
on.

Fail Safe:

All solenoid operations are stopped (OFF), the gear is fixed to the 3rd, and the lock-up is inhibited. (In case of
fail-safe valve failure, gear shift to 4th (over-drive) and lock-up are inhibited.)

Possible Cause:

Ground return wire open circuit between terminal assembly terminal 11 and TCM terminal B22 (C95).

Poor connection of each connector.