Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1861

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 
 
 
 

DIAGNOSIS  7A2-63

 

DTC P1860 (Flash Code 36) Lock-up Duty Solenoid Failure 

 

 

 

             

Control Valve

                           
                                                                               

TCM

B17

B23

B

Lock-up Solenoid

       

Terminal

Assembly

V

Line Pressure Solenoid

       

E54

(4)

(6)

H23

(14)

(6)

C95

(17)

(23)

  B

V

 

 
 

 

 

 

 
Setting Condition: 

•

  The lock-up 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: 

•

  The lock-up is inhibited. 

 
Possible Cause: 

•

  Lock-up duty solenoid malfunction. 

•

  Open (Off) circuit or short (On) circuit of the lock-up duty solenoid.