Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1860

7A2-56 DIAGNOSIS

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.

DIAGNOSIS 7A2-57

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

High Clutch Duty Solenoid Reference Wave Form

Measurement Terminal: B8 (+)

B22 (-)

Measurement Scale: 5V/div

20ms/div

Measurement Condition: P, N range in idle

Measurement Terminal: B8 (+)

B22 (-)

Measurement Scale: 5V/div

20ms/div

Measurement Condition: D range 3rd, 4th gear

7A2-58 DIAGNOSIS

DTC P0768 (Flash Code 34) Low Clutch Duty Solenoid 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/RED

C95

(6)

(7)

(8)

(9)

(22)

BLU/BLK

BLK/YEL

RED

WHT/BLU

GRY/RED

DIAGNOSIS 7A2-59

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.