Isuzu 4HL1 Workshop Manual page 87

Tech 2 Data
Item
Display
9/31 Idle Manual
Switch
10/31 Clutch Switch
11/31 Neutral Switch
12/31 Diagnostic
Switch
13/31 Exhaust Brake
Switch
14/31 Exhaust Brake
Valve
15/31 Retarder Switch
16/31 Diagnostic
Switch 1
17/31 Diagnostic
Switch 2
Units
displayed
ON/OFF This parameter refers to the
status whether the idle control is
manual or automatic. It appears
on the display when the idle
control is in manual mode. (The
unit is always OFF.)
ON/OFF This parameter refers to the
status of the signals input from
the clutch switch to the VIM. It
appears on the display after the
clutch switch is pressed.
ON/OFF This parameter refers to the
status of the signals input from
the neutral switch to the VIM. It
appears on the display after the
gear is in the neutral position.
ON/OFF This parameter refers to the
status of the signals input from
the diagnostic switch to the VIM.
It appears on the display after
DLC (data link connector) pins
jumpered.
ON/OFF This parameter refers to the
status of the signals input from
the exhaust brake switch to the
VIM. It appears on the display
after the exhaust brake switch in
the cab is pressed.
ON/OFF This parameter refers to the
status of the signals output from
the VIM to the exhaust brake
solenoid valve. After necessary
conditions such as engine speed,
QWS, AT, ASR, and exhaust
brake switch are met, the VIM
turns on the solenoid valve.
ON/OFF This parameter refers to the
status of the signals input from
the retarder switch to the VIM.
(The unit is always OFF.)
ON/OFF This parameter refers to the
status of the signals input from
the PTO switch to the VIM. It
appears on the display after the
PTO switch in the cab is pressed.
ON/OFF This parameter refers to the
status of the signals input from
the PTO switch to the VIM. It
appears on the display after the
PTO switch in the cab is pressed.
Engine Control System 1A-85
Description How to use parameters
When the display is fixed, the idle
control change-over switch,
circuit, or ECM may be faulty.
When the display is fixed, the
clutch switch, circuit, VIM,or ECM
may be faulty.
When the display is fixed, the
neutral switch, circuit, VIM, or
ECM may be faulty.
When the display is fixed, the
DLC (data link connector), circuit,
VIM, or ECM may be faulty.
When the display is fixed, the
exhaust brake switch, circuit,
VIM, or ECM may be faulty.
When the display is fixed, the
exhaust brake valve, circuit, VIM,
or ECM may be faulty.
When the display is fixed, the
retarder switch, circuit, VIM, or
ECM may be faulty.
When the display is fixed, the
PTO switch, circuit, VIM, or ECM
may be faulty.
When the display is fixed, the
PTO switch, circuit, VIM, or ECM
may be faulty.