2004 ISUZU TF SERIES Workshop Manual

Page 4065 of 4264

ISUZU TF SERIES 2004  Workshop Manual DIAGNOSIS (JR405E)  7A2-73 
 
Setting Condition: 
  During the running, the high clutch pressure switch does not turn on though hydraulic pressure is supposed to be 
generated in high clutch. 
  (All

Page 4066 of 4264

ISUZU TF SERIES 2004  Workshop Manual 7A2-74  DIAGNOSIS (JR405E) 
Step Action Yes No 
1 Clear the DTC from the memory once. 
Was the action complete? 
Go to Step 2 
Refer DTC clear 
method in this 
manual. 
2 Turn the ignition switch off

Page 4067 of 4264

ISUZU TF SERIES 2004  Workshop Manual DIAGNOSIS (JR405E)  7A2-75 
Step Action Yes No 
9 Check if the trouble is caused by a poor connection of terminal 
assembly connector. 
With the key switch in OFF position, is the connection condition

Page 4068 of 4264

ISUZU TF SERIES 2004  Workshop Manual 7A2-76  DIAGNOSIS (JR405E) 
DTC P0731 (Flash Code 41) 1st Gear Ratio Error 
DTC P0732 (Flash Code 42) 2nd Gear Ratio Error 
DTC P0733 (Flash Code 43) 3rd Gear Ratio Error 
DTC P0734 (Flash Code 44) 4t

Page 4069 of 4264

ISUZU TF SERIES 2004  Workshop Manual DIAGNOSIS (JR405E)  7A2-77 
Step Action Yes No 
6 Is the quantity of ATF correct? 
Go to Step 7 
Correct the quantity of 
ATF. 
 Go to Step 9 
7 Connect the Tech 2 and test the solenoids of respective

Page 4070 of 4264

ISUZU TF SERIES 2004  Workshop Manual 7A2-78  DIAGNOSIS (JR405E) 
DTC P1750 (Flash Code 51) Low & Reverse Brake Fail-safe Valve Failure 
 
Low & Reverse Brake Fail Valve (B)Control Valve Upper Body
Low & Reverse Brake Fail Valve (A)Contro

Page 4071 of 4264

ISUZU TF SERIES 2004  Workshop Manual DIAGNOSIS (JR405E)  7A2-79 
 
Step Action Yes No 
1 Turn the key switch on and check the DTC. Is only the DTC for 
low & reverse brake fail-safe valve failure outputted? 
Go to Step 2 
Go to Other DTC

Page 4072 of 4264

ISUZU TF SERIES 2004  Workshop Manual 7A2-80  DIAGNOSIS (JR405E) 
DTC P1755 (Flash Code 52) 2-4 Brake Fail-safe Valve Failure 
 
Control Valve Upper Body2-4 Brake Fail Valve (B)
Control Valve Lower Body2- 4 Br ake Fai l  Val ve ( A)
 
Set