Isuzu 4HL1, Workshop Manual

Page: 248 / 267

1A-246 Engine Control System
DTC417 - Starter Switch System Fault
Circuit Description
The starter switch, after moved to the position "ST", is
turned on and activates the starter. The ECM identifies
the starter operation using the signal input from this
starter switch. When the starter switch is turned on for
a long period, the ECM activates the starter cut relay to
stop the starter.
DTC417 will be set when the starter switch is still active
even after the engine speed exceeds 1000 rpm.
Major Faulty Event
• Starter malfunction
Conditions for Setting the DTC
The state where the starter switch is in "ST" position
and the engine speed is more than 1000 rpm is
continuously observed 100 times.
Action Taken When the DTC Sets
• Even after the DTC is set, the ECM will not
illuminate the CHECK ENGINE lamp (MIL).
Conditions for Clearing MIL/DTC
When the system fails and the DTC is stored to the
ECM, even repairing the faulty portion will not clear the
DTC from the memory. To clear the DTC, conduct the
following steps.
1. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
2. Turn on the idle position switch for not less than 1
second but not more than 3 seconds. (Release the
accelerator pedal.)
3. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
4. Turn on the idle position switch for not less than 1
second but not more than 3 seconds. (Release the
accelerator pedal.)
5. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
LNW21ALF005001-X
121 120 119
95 87
118 117 116 115 114
113
109
0.25B 1.25B 1.25B 0.75B
0.5B
3W/G
2W/G
1.25W/R 0.5B/W 0.75B/O 1.25W/R 1.25W/R 0.5L/Y 0.5L/Y
IG
(ST)
IG
(ON)
SBF
50A
SBF
100A
3W/L
0.5B
SBF
50A
SBF
30A
SBF
60A
#19
15A
#22
10A
ECM
(Engine
Control
Module)
Main
Relay
Glow
Relay
Glow
Relay
Battery