ISUZU TROOPER 1995 Workshop Manual

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BOOY-LH II
GENERATOR
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3W
RELAY;
CHASSIS ELECTRICAL 8-41
SHIFT LOCK CONTROLLER (5) (TO PAGE 8-2021
WARNING LIGHTS (METER) (TO PAGE 8-291 I
5W
HEATER & AIR CONOmONING
~
C-19 C-20 25A 10AAIC SLOWER
~N !~ b(ll ~ol ;~ cr:!l :::><0 ~t :f ~g (g

8-42 CHASSIS ELECTRICAL
CONNECTOR LIST
[!IHEJ
Fig. 8-57

STARTER SWITCH (FIG. 8-59)
Fig. 8-58
~
~
LOCK Removed
OFF
ACC Inserted
ON
START
4
(62)
CHASSIS ELECTRICAL 8-43
The starter switch positions are LOCK, OFF, ACC, ON
and START. Turning the starter key to these positions
provides a circuit
for starting the engine, the opera­
tion of accessories, or stops the engine.
~ INSPECTION
1 ~ 1 Check the continuity between the starter switch
connector terminals. (Fig. 8-59)
1
Repair or replace the switch when the result of
inspection is found abnormal.
5 3 2 7 8 6
(ACCl (IG2l (STl (61) (IG1l (KEY(£)) (KEY8l
o----o
Fig.
8-59

8-44 CHASSIS ELECTRICAL
B REMOVAL (FIG. 8-60)
Preparation: Disconnect the battery ground cable.
5. Starter switch
Fig. 8-60
1. Front console assembly
• Remove four screws.
• Remove the transmission shift lever knob.
• Remove the transfer shift lever knob.
• Disconnect the seat heater switch connectors
(If so equipped).
• Disconnect the "POWER & WINTER" switch
connectors
(A/T only).
2. Lower cluster assembly
• Remove three screws.
• Disconnect the cigar lighter connectors.
• Remove the cigar lighter illumination bulb
socket.
• Disconnect the ashtray illumination bulb
connector.
3. Instrument panel driver lower cover
• Remove the engine hood opener.
• Remove three screws and clip.
• Disconnect four fasteners.
4. Steering cowl
• Remove seven screws .
5. Starter switch
• Disconnect the connector.
• Remove the screw.
B INSTALLATION
To install, follow the removal steps in the everse
order noting the
following point.
1. When installing the steering cowl, be sure o pass
the harnesses through the route as
show in the
illustration so that the starter switch, th com­
bination switch and the inflator
module
will not get caught. (Fig. 8-61)
Starter switch
harness
Fig. 8-61
CLUTCH START SWITCH
cowl
When the clutch pedal is depressed, the clute start
switch is turned on
to form a circuit to activ e the
starter.
~ INSPECTION
1 til!. I Check the continuity between the clute start
switch terminals. (Fig. 8-62)
Replace the switch when the result
of insp ction
is found abnormal.

'

OFF
SW position Terminal No.
ON: Clutch pedal depressed
OFF: Clutch pedal released
Fig. 8-62
B REMOVAL (FIG.S-63)
2
Preparation: Disconnect the battery ground cable.
Fig. 8-63
1. Clutch start switch
Disconnect the connector
Loosen the lock nut, then turn the clutch start
switch counterclockwise.
B INSTALLATION
To install, follow the removal steps in the reverse
order.
STARTER RELAY
~ INSPECTION
ltgl Check to see if there is any continuity between
the relay terminals. (Fig. 8-64)
Replace the relay with a correct one when the
result of inspection is found abnormal.
CHASSIS ELECTRICAL 8-45
CD-®······ · · Continuity
@-G)· . · · · · .. No continuity
(When battery voltage is applied between®-@)
CD-®· · · · · · · · No continuity
@-G)· · · · · · · · Continuity
NOTE:
For relay removal, refer to "Connector Handling"
under "NOTES FOR WORKING ON ELECTRICAL
ITEMS"
in this section.
®JI ®~~
@~
®
Fig. 8-64
HEATER & AIR CONDITIONING RELAY
~ INSPECTION
l'fll Check to see if there is any continuity between
~ the relay terminals. (Fig. 8-65)
Replace the relay when the result of inspection is
found abnormal.
®-G) ..... · .. No continuity
(When battery voltage is applied between CD-@)
®-G) .... · · .. Continuity
Fig. 8-65

8-46 CHASSIS ELECTRICAL
MEMO
I
:·::···:::·.: ... ::::···:·:::::::.:·:::.::.:.:::·::: ... ::.::::.:·::::::::::::::::::::: ....... ::::::::::::::::·::::::::.·::::·:···:·:::::: .. :::::::::::::::::::::::::::1
I
··················\
··················\
··················\
········· ······f· ....
··················\
··················\
·············· ................. ···············j···\
··

CHASSIS ELECTRICAL 8-47
ENGINE CONTROL MODULE (ECM)
GENERAL DESCRIPTION
The ECM is used to control the fuel system of the
vehicle, especially in controlling the following items.
1. FUEL CONTROL
The amount of fuel and air sent into the combus­
tion chamber is controlled by controlling the fuel
sent through the injector.
2. ELECTRIC FUEL PUMP (INSTALLED IN
THE FUEL TANK)
The in-tank fuel pump is controlled by the ECM.
When starter switch is turned on, the pump will
run for 2 seconds, then stop unless the engine is
cranking
or running.
3. IGNITION CONTROL
The system is controlled by the spark timing con­
trol function of the ECM.
4. CIRCULATION OF EXHAUST GAS
The system controls the formation of NOx by
returning a small amount of exhaust gas to the
intake manifold
through the control valve.
'-" lAC: Idle air control
5. CONTROL OF AIR CONDITIONING (A/C)
For improved engine idling performance, the sys­
tem controls the operation of the air conditioner
by regulating the
clutch operation ofthe A/C com­
pressor in accordance
with changes in operation.
6. IDLE AIR CONTROL
The system controls the lAC Valve for the desired
idle speed in accordance
with changes in
operation.
7. DIAGNOSIS OF TROUBLES
When a sensor detects any signal that the ECM is
in
an abnormal condition, the ECM turns on the
malfunction
indicator (CHECK ENGINE) light in
the meter, and stores at the same
time the corre­
sponding diagnostic
trouble code (DTC) in the
memory to indicate to which system or circuit the
trouble represented by the
DTC belongs.
The ECM inspection connector (data link connec­
tor) is used
to retrieve the DTCs stored from the
ECM.
Refer to Section 6 "ENGINE DIAGNOSIS" for de­
tails.

.~·-
, ca· CIO I O'l O'l
ENGINE
COOLANT TEMPERATURE SENSOR
VSV:
INTAKE
AIR~""-"-,
FUEL
~,
'"-
E-22
INJECTOR
No.5
'~~
FUEL
~
"':·.E-23
INJECTOR
No.3
"-
'"<
FUEL
"-
·,,,
E-~
4 /'
INJECTOR
No.'1'~-
1~4 "...

.......
. .......
' '
/
BODY
ASM
"-..'-
>
DIS / / E-18
ICM !POWER)
THROTILE '
E-~5·.-..,
.. '-, ·,/
r
E-2~,,
/E-5v~~;>o~~
--vsv:EGR
FUEL
INJECTOR
No.6
E-11
~E-10 ~FUEL
INJECTOR
No.4
E-27-+
"'
:1
~
.........
_
'-......
"·INTAKE
AIR TEMPERATURE SENSOR
ECM EGR EVAP
lAC
ICM MAP TP vsv )
X
·"
~
FUEL
INJECTOR
No.2
VSV: EVAP CANISTER
E28
E29
RESISTOR:UPSHIFT-M/T

CRANKSHAFT
POSITION
SENSOR
MAP
SENSOR RELAY:UPSHIFT-M/T ,
ENGINE
CONTROL
MODULE
EXHAUST GAS RECIRCULATION
EVAPORATIVE EMISSION IDLE
AIR CONTROL
IGNITION CONTROL
MODULE
MANIFOLD ABSOLUTE PRESSURE
THROTILE POSITION VACUUM
SWITCHING
VALVE
DIODE-AfT
'...,
RELAY:
ECM
MAIN
~"'-.,'...,
RELAY:FUEL
PUMP
'....
'
RELAY
& FUSE BOX
(FL-1,FL-2,FL-3,F-2,F-10)
BATIERY~
H-41 H-42~
KNOCK SENSOR
MODULE
)
DATA
LINK
CONNECTOR
VEHICLE
SPEED
SENSOR
(METER)
MALFUNCTION INDICATOR LIGHT (CHECK ENGINE) UPSHIFT INDICATOR LIGHT
(METER)-M/T
STARTER
SW
·~FUEL
PUMP
EVAP CANISTER
)
~
co I
~
~ co
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0
C/)
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-
m
0
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0
I
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c
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0
0 )>
J:
r-
0

!! (Q
(
FUEL INJECTOR
No.1
/
FUEL INJECTOR
No.5
FUEL INJECTOR
No.3
I
\/.
ICM
CPOWERl
_/
E-27
cp
I
CRANKSHAFT
~
POSITION SENSOR
ECM
: ENGINE
CONTROL
MODULE
EGR
:EXHAUST
GAS
RECIRCULATION
lAC
: IDLE
AIR
CONTROL
ICM
: IGNmON
CONTROL
MODULE
MAP
: MAN
I FORD
ABSOLUTE
PRESSURE
VSV
:VACUUM
SWITCHING
VALVE
(
VSV:EGR I VSV:
EVAPORATIVE
EMISSION
CANISTER
THROTTLE
POSmON
SENSOR
~FUEL
INJECTOR
No.6
FUEL
INJECTOR
No.4
FUEL
INJECTOR
No.2
ICMCCRl ICMCCONTl
RESISTOR:UPSHIFT-MIT RELAY:UPSHIFT-1-MIT
DIODECAITl
RELAY:
ECM
MAIN
RELAY:FUEL
PUMP
RELAY
& FUSE
BOX
CFL-1,FL-2,FL-3,F-2,F-10l
H-41 H-42
POWER
STEERING
PRESSURE
SW.
H-33
VEHICLE
SPEED
SENSOR (METER) MALFUNCTION INDICATOR
LIGHT
(CHECK
ENGINE)
UPSHIFT
INDICATOR
LIGHT
CMETERl-MfT
(
/STARTER
SW.
F-4
/
DATA
LINK
I
d .
'v_AR__
FUEL
PUMP
CONNECTOR~
!P
~;~·
/~
,,
1-9
~ ~ r-0 n ~ 0 2 • en 0 X n
(") ::::1: )> CJ)
CJ) Cii m r­m ~ :D ~ r-01) I fD

8-50 CHASSIS ELECTRICAL
CIRCUIT DIAGRAM-DOHC
+
~~ BODY ENG.
2R/W
~ ~ 0 FUEL INJECTOR No.6
t E-13 i H·42
l
~ ~ II! 0
0.611
~
F·10 1SA FUEL PUMP
I O.SB
IM/T)
' ' 4
~ '
'
'
'
9! ;: ·' ~ Oo .. ---_I
O.SB/G O.SB/Y
EGA: EXHAUST GAS RECIRCULATION
Fig. 8-68
..