Dtc82 - Neutral Switch System Fault - Isuzu 4HL1 Workshop Manual

DTC82 - Neutral Switch System Fault

Freezer
SW
0.85 L/B
0.5
L/B
47
Circuit Description
The neutral switch (P/N switch in case of automatic
transmission) is turned on when the shift lever is moved
to the neutral position (parking or neutral position for
automatic transmission). The ECM receives the on/off
signal from this neutral (or P/N) switch to control the
powertrain so that the driver cannot start the engine as
long as the shift lever is not in the neutral (or parking)
position.
DTC82 will be set when the neutral (P/N) switch on/off
signal is faulty.
Major Faulty Event
• Generation of black smoke
• Poor driveability
• Inactive exhaust brake
• Inactive QWS
M/T : N Warm
A/T : P Up
or N SW
0.5 0.5 0.5
B/G BR/R LG/R
44 12 50
SBF
100A
Battery
Main Relay
Torque
Exhaust
Cut
Brake
SW
SW
CFS
Non
Vehicle
0.5 0.5
W/O W/L
11 49
Conditions for Setting the DTC
The engine is running for at least 180 seconds and the
neutral switch is changed from on to off.
Action Taken When the DTC Sets
• After the DTC is set, the ECM will illuminate the
CHECK ENGINE lamp (MIL).
• The exhaust brake is disabled.
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.)
Engine Control System 1A-163
SBF
50A
Key
SW
(ON)
# 19
15A
Clutch
SW
CFS
CFS
Vehicle
0.85 0.5
0.5 LG/L
B/O B/W
36
Key SW
(START)
# 22
10A
46
VIM
(Vehicle
Interface
Module)
LNW21ALF005701-X