Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1752

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.

7A2-60 DIAGNOSIS

Reference:
When the low clutch duty solenoid is operated, following signal is outputs.
Measurement terminal: B9 (C95) and B22 (C95)
-AC range by circuit tester: Approximately 6.8V

Low Clutch Duty Solenoid Reference Wave Form

Measurement Terminal: B9 (+)

B22 (-)

Measurement Scale: 5V/div

20ms/div

Measurement Condition: D range 4th gear

Measurement Terminal: B9 (+)

B22 (-)

Measurement Scale: 5V/div

20ms/div

Measurement Condition: P, N range in idle

DIAGNOSIS 7A2-61

DTC P0748 (Flash Code 35) Line Pressure Solenoid Failure

Control Valve

TCM

B17

B23

BLK

Lock-up Solenoid

Terminal

Assembly

VIO

Line Pressure Solenoid

E54

(4)

(6)

H23

(14)

(6)

C95

(17)

(23)

BLK

VIO

Setting Condition:

•

The line pressure 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:

•

The operation of the line pressure solenoid is stopped (OFF).

Possible Cause:

•

Line pressure solenoid malfunction.

•

Line pressure solenoid harness open (Off) circuit or short (On) circuit.

7A2-62 DIAGNOSIS

•

Open circuit, short circuit to battery or short circuit to ground between line pressure solenoid terminal 6 and TCM

terminal B23 (C95).

•

Insufficient ground condition of the line pressure solenoid.

•

Poor connection of each connector.

Reference:
When the line pressure solenoid is operated, following signal is outputted.
Measurement terminal: B23 (C95) and B22 (C95)
-At N rage: Battery voltage
-At D range: Less than 1V