2004 ISUZU TF SERIES Workshop Manual

Page 4057 of 4264

ISUZU TF SERIES 2004  Workshop Manual DIAGNOSIS (JR405E)  7A2-65 
 
Setting Condition: 
  During the running, the low & reverse brake pressure switch does not turn on though hydraulic pressure is 
supposed to be generated in the low & re

Page 4058 of 4264

ISUZU TF SERIES 2004  Workshop Manual 7A2-66  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

Page 4059 of 4264

ISUZU TF SERIES 2004  Workshop Manual DIAGNOSIS (JR405E)  7A2-67 
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 4060 of 4264

ISUZU TF SERIES 2004  Workshop Manual 7A2-68  DIAGNOSIS (JR405E)  
DTC P1858 (Flash Code 27) 2-4 Brake Pressure Switch Failure 
  
 
 
       Control Valve
               
                                        TCM 
B1 
B12 
B20 
RED/YEL

Page 4061 of 4264

ISUZU TF SERIES 2004  Workshop Manual DIAGNOSIS (JR405E)  7A2-69 
 
Setting Condition: 
  During the running, the 2-4 brake pressure switch does not turn on though hydraulic pressure is supposed to be 
generated in 2-4 brake. 
  (All pre

Page 4062 of 4264

ISUZU TF SERIES 2004  Workshop Manual 7A2-70  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 4063 of 4264

ISUZU TF SERIES 2004  Workshop Manual DIAGNOSIS (JR405E)  7A2-71 
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 4064 of 4264

ISUZU TF SERIES 2004  Workshop Manual 7A2-72  DIAGNOSIS (JR405E)  
DTC P1863 (Flash Code 28) High Clutch Pressure Switch Failure 
  
 
 
       Control Valve
               
                                        TCM 
B1 
B12 
B20 
RED/Y