ISUZU TF SERIES 2004 Workshop Manual

DIAGNOSIS (JR405E) 7A2-49
Gear Position & Shift Solenoid Operation


Range TCM terminal

Gear B8
(High clutch
solenoid) B9
(Low clutch
solenoid) B7
(2-4 brake
solenoid) B6
(Low & reverse
brake solenoid)
P 

R Reverse


N 

D, 3, 2 1st

2nd


3rd


4th


L 1st


2nd


3rd


4th


: On (Operated)

: Off (Not operated)

Setting Condition:

The low & reverse brake duty solenoid signal is open circuit or short circuit.
(The voltage different from the output ON/OFF signals was detected while the TCM monitors the solenoid output
voltage.)

Fail Safe:

When the vehicle is running, the operation of the low & reverse brake duty solenoid and the lock-up solenoid is
stopped (OFF), the gear position selected at the trouble detection is held, and the lock-up is inhibited.

After the vehicle stopped, all solenoid operations stop (OFF) and the gear is fixed to the 3rd.

Possible Cause:

Low & reverse brake duty solenoid malfunction.

Open (Off) circuit or short (On) circuit harness of the low & reverse brake duty solenoid.

Open circuit, short circuit to battery or short circuit to ground between low & reverse brake duty solenoid terminal
5 and TCM terminal B6 (C96).

Insufficient ground condition of the low & reverse brake duty solenoid.

Poor connection of each connector.

7A2-50 DIAGNOSIS (JR405E)
Reference:
When the low & reverse brake solenoid is operated, following signal is outputted.
Measurement terminal: B6 (C95) and B22 (C95)
-AC range by circuit tester: Approximately 6.2V
-Oscilloscope: Following wave form can be found.

Low & Reverse Brake Duty Solenoid Reference Wave Form
Measurement Terminal: B6 (+) B22 (-)
Measurement Scale: 5V/div 10ms/div
Measurement Condition: P, N range in idle
Measurement Terminal: B6 (+) B22 (-)
Measurement Scale: 5V/div 10ms/div
Measurement Condition: R range in idle
0V
0V

DIAGNOSIS (JR405E) 7A2-51
DTC P0758 (Flash Code 32) 2-4 Brake Duty Solenoid Failure



C ontrol Valve

TCM
B6
B7
B8
B9
B22 (GND)
BLU/BLK
WHT/BLU
L&R Brake Solenoid

Term inal
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

7A2-52 DIAGNOSIS (JR405E)
Gear Position & Shift Solenoid Operation


Range TCM terminal

Gear B8
(High clutch
solenoid) B9
(Low clutch
solenoid) B7
(2-4 brake
solenoid) B6
(Low & reverse
brake solenoid)
P 

R Reverse


N 

D, 3, 2 1st

2nd


3rd


4th


L 1st


2nd


3rd


4th


: On (Operated)

: Off (Not operated)

Setting Condition:

The 2-4 brake duty solenoid signal is open circuit or short circuit.
(The voltage different from the output ON/OFF signals was detected while the TCM monitors the solenoid output
voltage.)

Fail Safe:

When the vehicle is running, the operation of the 2-4 brake duty solenoid and the lock-up solenoid is stopped
(OFF), the gear position selected at the trouble detection is held, and the lock-up is inhibited.

After the vehicle stopped, all solenoid operations stop (OFF) and the gear is fixed to the 3rd.

Possible Cause:

2-4 brake duty solenoid malfunction.

Open (Off) circuit or short (On) circuit of the 2-4 brake duty solenoid.

Open circuit, short circuit to battery or short circuit to ground of the harness between 2-4 brake duty solenoid
terminal 9 and TCM terminal B7 (C95).

Insufficient ground condition of the 2-4 brake duty solenoid.

Poor connection of each connector.

DIAGNOSIS (JR405E) 7A2-53
Reference:
When the 2-4 brake duty solenoid is operated, following signal is outputted.
Measurement terminal: B7 (C95) and B22 (C95)
-AC range by circuit tester: Approximately 6.2V
-Oscilloscope: Following wave form can be found.


2-4 Brake Duty Solenoid Reference Wave Form
Measurement Terminal: B7 (+) B22 (-)
Measurement Scale: 5V/div 10ms/div
Measurement Condition: P, N range in idle
Measurement Terminal: B7 (+) B22 (-)
Measurement Scale: 5V/div 10ms/div
Measurement Condition: D range 4th gear
0V 0V

7A2-54 DIAGNOSIS (JR405E)
DTC P0763 (Flash Code 33) High Clutch Duty Solenoid Failure



C ontrol Valve

TCM
B6
B7
B8
B9
B22 (GND)
BLU/BLK
WHT/BLU
L&R Brake Solenoid

Term inal
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

DIAGNOSIS (JR405E) 7A2-55
Gear Position & Shift Solenoid Operation


Range TCM terminal

Gear B8
(High clutch
solenoid) B9
(Low clutch
solenoid) B7
(2-4 brake
solenoid) B6
(Low & reverse
brake solenoid)
P 

R Reverse


N 

D, 3, 2 1st

2nd


3rd


4th


L 1st


2nd


3rd


4th


: On (Operated)

: Off (Not operated)

Setting Condition:

The high clutch duty solenoid signal is open circuit or short circuit.
(The voltage different from the output ON/OFF signals was detected while the TCM monitors the solenoid output
voltage.)

Fail Safe:

When the vehicle is running, the operation of the high clutch duty solenoid and the lock-up solenoid is stopped
(OFF), the gear position selected at the trouble detection is held, and the lock-up is inhibited.

After the vehicle stopped, all solenoid operations stop (OFF) and the gear is fixed to the 3rd.

Possible Cause:

High clutch duty solenoid malfunction.

Open (Off) circuit or short (On) circuit of the high clutch duty solenoid.

Open circuit, short circuit to battery or short circuit to ground between high clutch duty solenoid terminal 10 and
TCM terminal B8 (C95).

Insufficient ground condition of the high clutch duty solenoid.

Poor connection of each connector.

7A2-56 DIAGNOSIS (JR405E)
Reference:
When the high clutch duty solenoid is operated, following signal is outputted.
Measurement terminal: B8 (C95) and B22 (C95)
-AC range by circuit tester: Approximately 6.2V
-Oscilloscope: Following wave form can be found.

High Clutch Duty Solenoid Reference W ave Form
Measurement Terminal: B8 (+) B22 (-)
Measurement Scale: 5V/div 10ms/div
Measurement Condition: P, N range in idle
Measurement Terminal: B8 (+) B22 (-)
Measurement Scale: 5V/div 10ms/div
Measurement Condition: D range 3rd, 4th gear
0V 0V

DIAGNOSIS (JR405E) 7A2-57
DTC P0768 (Flash Code 34) Low Clutch Duty Solenoid Failure



C ontrol Valve

TCM
B6
B7
B8
B9
B22 (GND)
BLU/BLK
WHT/BLU
L&R Brake Solenoid

Term inal
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

7A2-58 DIAGNOSIS (JR405E)
Gear Position & Shift Solenoid Operation


Range TCM terminal

Gear B8
(High clutch
solenoid) B9
(Low clutch
solenoid) B7
(2-4 brake
solenoid) B6
(Low & reverse
brake solenoid)
P 

R Reverse


N 

D, 3, 2 1st

2nd


3rd


4th


L 1st


2nd


3rd


4th


: On (Operated)

: Off (Not operated)

Setting Condition:

The low clutch duty solenoid signal is open circuit or short circuit.
(The voltage different from the output ON/OFF signals was detected while the TCM monitors the solenoid output
voltage.)

Fail Safe:

When the vehicle is running, the operation of the low clutch duty solenoid and the lock-up solenoid is stopped
(OFF), the gear position selected at the trouble detection is held, and the lock-up is inhibited.

After the vehicle stopped, all solenoid operations stop (OFF) and the gear is fixed to the 3rd.

Possible Cause:

Low clutch duty solenoid malfunction.

Open (Off) circuit or short (On) circuit harness of the low clutch duty solenoid.

Open circuit, short circuit to battery or short circuit to ground between low clutch duty solenoid terminal 3 and
TCM terminal B9 (C95).

Insufficient ground condition of the low clutch duty solenoid.

Poor connection of each connector.