fuel ISUZU TROOPER 1995 Workshop Manual

8-52 CHASSIS ELECTRICAL
CIRCUIT DIAGRAM-SOHC
FL-2 IOAKEYIW 3WIB
E"!J IP~1oj I P~71 IODV ENG. FRAME
F·IO 1SA FUEL I'UMP
0.68
F·2 lOA OXYGEN lENlOR
0.868('(
2RIW
O.SPIW
9! 0
FL-3 30AECM
12
H ·42
0.868('(
' ' '2
@
ll .. , ...,, o,
i ., z
2R/W
O.SB
15 H-"2
FUEL
~ INJECTOR
! ~~--------~
IODV·CTA II
fiiNDER·RHii
COMMON{II CHAMBER II
~~~II
FENDER·LHij
FENDER·LH II
28
0.611/Y
9! 0
;: o' '
EGA: EXHAUST GAS RECIRCULATION
Fig. 8-69
O.Slf'f
1.251110
2A/W
No.1
5 ~
• ;I ~ 3 ill H·41
i i:i 1!
lg
II

8-56 CHASSIS ElECTRICAl
STARTER SWITCH NOTE:
Refer
to START AND CHARGING in this section. For relay
removal, refer to "Connector H ndling" ~
under "NOTES FOR WORKING ON ELE TRICAL .,..........
DATA LINK CONNECTOR ITEMS" in this section.
The data
link connector (white) is used to retrieve the
diagnostic
trouble codes stored from the engine UPSHIFT-1 RELAY
control module. The data link connector is installed at .----------------+----.
inside of the instrument panel driver lower cover.
(Fig. 8-72)
Fig. 8-72
FUEL PUMP RELAY
ENGINE CONTROL MODULE MAIN
RELAY
,-------,
"" __!.___./, ' 4 '<)I ~
~! Q)__l__1__j" ' L _____ _j
Fig. 8-73
~ INSPECTION
Check to see if there is any continuity between
the
relay terminals. (Fig. 8-73)
Replace the relay when the result of inspection
is found
abnormal.
®-@ · · · · · · · · No continuity
(When battery voltage is applied between CD-@)
®-@ · · · · · · · · Continuity
m
:
Fig. 8-74
~ INSPECTION
ltgl Check to see if there is any continuity b tween
the
relay terminals. (Fig. 8-7 4)
Replace the relay when the result of ins ~
is found abnormal.
DIODE
Terminal No. 4 3
Connection A (±) 8
pattern 8 8 (±)
Fig.
8-75
..

8-288 CHASSIS ELECTRICAL
METER AND WARNING/INDICATOR LIGHT
GENERAL DESCRIPTION
The circuit consists of the starter switch, meter assembly, vehicle speed sensor, clutch switch, transmission
switch, lighting switch,
turn signal switch, thermo unit, oil pressure unit, Engine Control Module, fuel tank unit,
4WD
SW, oil pressure switch, parking brake switch, brake fluid switch, seat belt switch and illumination
controller.
The meter ASM contains the speedometer, tachometer, voltmeter, engine coolant temperature gauge, oil
pressure gauge, fuel gauge and warning/indicator lights.
The meter warning/indicator lights and
their bulb sockets are a unit, they are installed from the back of the
speedometer assembly.

::!!
(
(
PARKING
BRAKE
SW
PARKING
BRAKE
LEVER
VEHICLE
SPEED
SENSOR

4WD
INDICATOR
SW,

~
' '
/;~>
TRANSMISSION
3-4SW
IMJT)

"vf;/
RESISTOR;UPSHIFT
."­
RELAY;UPSHIFT-1
~":'""
RELAY
& FUSE
BOX-_
(FL-1
,FL-21 BA.
TTERY--.;:;4"~
H-41 H-42
-----;1-"'.,.,-~
THERMO
UNIT
FUEL
TANK
UNIT
(FUEL
TANK)
METERASM
~
16)
1 /
1
(
H-7
/'1'-J
? I n
H-8 H-9 H-25
H-26 C..15 BRAKE
FLUID
SW
(BRAKE
FLUID
TANK}
FUSE
BOX
IC-4,
C-10}
\CLUTCH
SW
(M/T)
CLUTCH
PEDAL
(Mm
(
~ ::xs ~ r-0 0 ~ -0 2
(") :X: ~ en (i) m r­m (") ~ g r­oo I ~

•
, ce· CX) I w w .....
..
~ m
0
z
0 0 <
m
n
"'
-1
:D
"'
:z:
= ~~ :;; )
O.SIItll 2B
O.&B
ID
-,~
r
-•3
'
.. '
'
' ' IGNITION
CONTROL
MODULECTO
PAGE
S.S1,
531
ECMCASI
(TO PAGE
11-51,
531
TCMihl (TO PAGE
8-1t41
TCMIA111 (TO PAGE
11-1141
~[~} m[i] ~ .:. II
. 0 j[~}l
I'lL,
II"
:----~
.. :~.:,._
:
fill
:~
~~~~ I -··
.!., -
SPEEOOMETER TACHOMETER VOLTMETER ENGINE
COOLANT
TEMPERATURE
GAUGE
OIL PRESSUSRE
GAUGE
FUEL
GAUGE MALFUNCT10N
INDICATOR
lCHECKENGWEI
POWEll -TER
)
O.SL
ECMIDIII
ITO PAGE
11-51,
531
CRUISE
CONTROL UNITI131 ITO PAGE
11-1741
O.SLJY ;;
~ ~ '!' ;;: ~ ~ n ~ ~ )
n -:JJ n c =i c -)> G) :JJ )> 3:
co I N CD 0 (") :.t: > Cl) Cl) Cl) m ,.... m Q , n )> ,....

CHASSIS ELECTRICAL 8-295
5. Oil pressure gauge
Check point Meter Oil pressure Oil pressure Cable
Trouble mode
assembly meter unit harness
5-1 Oil pressure meter needle does not move 0
0 0
0 (3) (4) (1) (2)
5-2 Oil pressure
gauge reading is too low 0
0 0
0
(or
high) (3) (4) (2) (1)
5-3 Needle overshoots
(or goes up to 2151b/in2.) 0
0 0 0 (3) (4) (2)
(1)
NOTE: Figure
in parenthesis "( )" indicates the order of inspection.
6. Fuel gauge
Check point Meter Fuel Fuel tank Cable
Trouble mode assembly
meter unit harness
6-1 Fuel gauge needle does not move 0
0 0 0 (3) (4) (2) (1)
6-2 Even when the tank is filled up with fuel, the needle 0
0 0
0
not reach "F" (3) (4) (2)
(1)
6-3
Even when the tank is not full of fuel, the needle 0
0 0
0
overshoots (or goes to "F") (3) (4) (2) (1)
NOTE: Figure
in parenthesis "( )" indicates the order of inspection.
7. Warning/indicator light
~
Light Parking
Brake Oil Fuel Cable brake fluid pressure tank bulb sw sw sw unit harness
e
7-1 When the parking brake lever is pulled, the 0 0 0
indicator light does not light up. (1) (2) (3)
7-2 Even
when the parking brake lever is released, 0 0 0
the indicator light does not go off. (1) (2) (3)
7-3 While the engine operating,
the oil pressure 0 0
warning light does not go
off. (2)
(1)
7-4 Even
when the tank is full of fuel, the fuel 0 0
warning light lights
up. (2) (1)
7-5 Even
when the tank is empty, the fuel warning 0 0
0
light does not light up. (1) (2)
(3)
NOTE: Figure in parenthesis "( )" indicates the order of inspection.

8-308 CHASSJS ELECTRICAL
6. FUEL GAUGE
6-1 FUEL GAUGE NEEDLE DOES NOT MOVE
• IS THE CONNECTOR OF THE FUEL TANK UNIT(£[]
CONNECTED SECURELY?
I
YES I I NO I
I
• DISCONNECT THE CONNECTOR OF THE FUEL TANK UNIT I CONNECT THE CONNECTOR I
• CONNECT A 3.4W BULB BETWEEN THE HARNESS SIDE CONNECTOR 2 ~AND THE GROUND OF THE FUEL TANK UNIT
• WHEN THE STARTER SW IS TURNED ON, DOES THE FUEL GAUGE NEEDLE FLUCTUATE AFTER ABOUT 90 SECONDS?
I
YES I NO I
I
• IS THERE CONTINUTV BETWEEN THE FUEL TANK UNIT • IS THE CIRCUIT BETWEEN THE FUEL GAUGE AND THE FUEL
CONNECTOR TERMINALS 2 ~AND 1 [£I) ? TANK UNIT NORMAL?
I
I I
l
YES I NO I YES I NO l
I I I
REPAIR A POOR CONNEC-REPLACE THE FUEL TANK • IS THERE A BROKEN WIRE REPAIR A POOR CONNECTION
TION AT THE CONNECTORS UNIT IN THE PRINTED CIRCUIT AT THE CONNECTORS OR A
OR A OPEN CIRCUIT OF THE METER ASSEMBL Y7 OPEN CIRCUIT IN THE CIRCUIT
BETWEEN THE FUEL TANK
UNIT AND THE GAUGE I
I I
YES I NO I
I l
REPLACE THE PRINTED CHECK THE FUEL GAUGE,
CIRCUIT BOARD AND REPLACE IT IF NECESSARY
..

CHASSIS ELECTRICAL 8-309
6-2 EVEN WHEN THE TANK IS FILLED UP WITH FUEL, THE NEEDLE DOES
NOT REACH "F"
• WHEN INSERTING AND PULLING OUT THE CONNECTOR [£;§]OF THE FUEL TANK UNIT SEVERAL TIMES, DOES THE POINTER OF THE FUEL GAUGE STAY AT THE SAME POSITION?
I
YES I NO I
I
• DISCONNECT THE CONNECTOR OF THE FUEL TANK UNIT REPAIR A POOR CONNECTION AT THE CONNECTOR
• CONNECT
THE FUEL TANK UNIT HARNESS SIDE OF THE FUEL TANK UNIT CONNECTOR 1 [£;§]AND 2 [[§] WITH A LEAD WIRE.
•
WHEN THE STARTER SW IS TURNED ON, DOES THE
NEEDLE OVERSHOOT TO "F" AFTER ABOUT 5 MINUTES
I
YES I NO I
I
• REMOVE THE FUEL TANK UNIT • IS THERE A BROKEN CIRCUIT IN THE PRINTED
• DOES THE FLOAT ARM OPERATE SMOOTHLY? CIRCUIT OF THE METER ASSEMBLY?
I
I
I
YES I YES I NO J
I I
• IS THE RESISTENCE
REPLACE THE PRINTED CHECKTHEFUELGAUG~ VALUE OF THE FUEL TANK CIRCUIT BOARD AND REPLACE IT IF UNIT NORMAL? NECESSARY
NO
REPLACE
THE FUEL TANK UNIT

8-310 CHASSIS ELECTRICAL
6-3 WHEN THE TANK IS NOT FULL OF FUEL, THE NEEDLE
OVERSHOOTS (OR GOES UP TO "F")
• DISCONNECT THE CONNECTOR OF THE FUEL TANK UNIT
•
WHEN THE STARTER SW IS TURNED ON, DOES THE NEEDLE STILL POINT TO "F"7
I
I I
YES I NO I
I I
• IS THE CIRCUIT BETWEEN THE FUEL TANK UNIT AND THE • REMOVE THE FUEL TANK UNIT FUEL GAUGE NORMAL?
• DOES THE FLOAT ARM OPERATE SMOOTHLY?
I I
I
I I
YES I NO I YES J
I I
I
• IS THE PRINTED CIRCUIT REPAIR A SHORT CIRCUIT • ARE THE RESISTANCE VALUES OF THE OF THE METER ASSEMBLY IN THE CIRCUIT FUEL TANK UNIT AT "E" AND "F" POINTS GROUNDED SECURELY? NORMAL?
I I
I I I
YES I NO I NO I
I I I
CHECK THE FUEL GAUGE, REPAIR OR REPLACE THE REPLACE THE FUEL TANK UNIT I AND REPLACE IT IF PRINTED CIRCUIT BOARD
NECESSARY
•

CHASSIS ELECTRICAL 8-313
7-3 WHILE THE ENGINE IS OPERATING, THE OIL PRESSURE WARNING
LIGHT WILL
NOT GO OFF
• IS THE ENGINE OIL PRESSURE NORMAL? I
I
I I
YES I NO I
I I
• WITH THE OIL PRESSURE SWITCH CONNECTOR REFER TO THE "ENGINE" SECTION OF
~DISCONNECTED, DOES THE WARNING THIS MANUAL LIGHT GO OFF?
I
I I
YES I NO I
I I
• WHILE THE ENGINE IS OPERATING, IS THERE REPAIRctTIORT CIRCUIT BETWEEN 1 [ill CONTINUITY BETWEEN THE OIL PRESSURE SWITCH AND 9 1-10 (METER) CONNECTOR 1~ AND THE BODY GROUND?
I
I
NO I
I
REPLACE THE OIL PRESSURE SWITCH I
7-4 EVEN WHEN THE FUEL TANK IS FULL WITH FUEL, THE FUEL
WARNING LIGHT LIGHTS UP
• WHEN THE FUEL TANK UNIT CONNECTOR
[EIJ1s DISCONNECTED, DOES THE WARNING LIGHT GO OFF?
l
YES I NO I
I
• IS THE FUEL TANK UNIT NORMAL? I REPAIR A SHORT CIRCUIT BETWEEN THE FUEL
TiNK JNIT HARNESS SIDE CONNECTORS 4 F-5 AND 11 [I!QJ (METER)
1
NO I
I
REPLACE THE FUEL TANK UNIT I