Isuzu 4HL1 Workshop Manual page 88

1A-86 Engine Control System
Tech 2 Data
Item
Display
18/31 PTO Idle Position
Switch
19/31 QWS Switch
20/31 Glow Time Lamp
21/31 ECO Relay
22/31 Engine Stop
Switch
23/31 Engine Start
Counts
24/31 Engine Start
Counts (After
Starter Replace)
25/31 ASR Installation
26/31 ASR Accelerator
Opening
Units
displayed
ON/OFF This parameter refers to the
working condition of the PTO
accelerator. It appears on the
display when the PTO
accelerator is not working (the
PTO accelerator position is about
0 %).
ON/OFF This parameter refers to the
status of the signals input from
the QWS (quick warm-up
system) switch to the VIM. It
appears on the display after the
QWS switch in the cab is
pressed.
ON/OFF This parameter refers to the
status of the signals output from
the VIM to the glow lamp. It
appears on the display after
necessary conditions such as
engine speed, engine coolant
temperature, and starter are met.
ON/OFF This parameter refers to the
status of the signals output from
the VIM to the ECO relay. It
appears on the display after
necessary conditions such as
battery voltage, engine coolant
temperature, vehicle speed,
QWS switch, neutral switch, and
idle stop switch are met.
ON/OFF This parameter refers to the
status of the signals input from
the engine stop switch to the
VIM. (The unit is always OFF.)
Counts This parameter refers to the
accumulated count of starter
operations.
Counts This parameter refers to the
accumulated count of starter
operations after the starter is
replaced.
Installed/ This parameter refers to the
Not status whether the ASR is
installed installed to the vehicle.
% When the ASR is working, the
accelerator position is limited (the
position is normally reduced from
100 %). This parameter refers to
the percentage calculated by the
VIM using the signals input from
the ASR controller.
Description How to use parameters
When the display is fixed, the
PTO idle position switch, circuit,
VIM, or ECM may be faulty.
When the display is fixed, the
QWS switch, circuit, VIM, or ECM
may be faulty.
When the display is fixed, the
lamp, circuit, VIM,or ECM may be
faulty.
When the display is fixed, the
relay, circuit, VIM, or ECM may
be faulty.
When the display is fixed, the
engine stop switch, circuit, VIM,
or ECM may be faulty.
When the count number exceeds
150000, DTC18 is issued.
When the count number exceeds
150000, DTC18 is issued.
When the display is fixed,
communications with ABS/ASR
control unit, ABS/ASR system,
VIM, ECM, or ABS/ASR control
unit may be faulty.
When the display is fixed,
communications with ABS/ASR
control unit, ABS/ASR system,
VIM, ECM, or ABS/ASR control
unit may be faulty.