1998 ISUZU TROOPER check engine

LIGHTING SYSTEM8A–29
Light NameRated PowerNumber of
BulbsLens ColorRemarks
Headlight60w/55w2WhiteHalogen
FrontTurn signal light21w2Whitecombination
lightClearance light5w2Amber
FRT fog light55w2WhiteHalogen
Taillight/Stoplight5w/21w2Red
RearBumperTurn signal light21w2Ambercombination
lightTaillight/Stoplight5w/21w2RedBodyTurn signal light21w2Amber
Backup light21w2White
RR fog light21w2Red
Side turn signal light5w2Amber
License plate lightBumper5w2White
Body5W1White
High mount stoplight——RedLED
Map light5w2White
Dome light10w1White
Luggage room light8w1White
Courtesy light3.8w2White
A/C SW60mA1
RR defogger SW0.84w1
Mirror defogger SW0.84w1
FRT fog light SW0.7w1
RR fog light SW0.7w1
Cruise (Set)1.4w1Meter
Cruise (Main)1.4w1Meter
Check trans3w1Meter
Anti-theft3w1Warning box
Turn signal1.4w2Meter
Golw1.4w1Meter
Water sedimenter1.4w1Meter
Indicator/High beam1.4w1MeterWarning
lightABS1.4w1Meter
Check engine1.4w1Meter
Low fuel1.4w1Meter
4WD1.4w1Meter
Oil Pressure1.4w1Meter
Brake system1.4w1Meter
Charge1.4w1Meter
Seat belt2w1Meter
A/T shift position0.91w7Meter
A/T oil temp3w1Meter

8DÐ8 WIRING SYSTEM
5. The wiring harness between engine and chassis
should be long enough (2). Tension of the wire (1) may
causes chafing or damage due to various vibrations.
Splicing Wire
1. If the harness is taped, remove the tape. To avoid wire
insulation damage, use a sewing Òseam ripperÓ
(available from sewing supply stores) to cut open the
harness.
If the harness has a black plastic conduit, simply pull
out the desired wire.
2. Begin by cutting as little wire off the harness as
possible. You may need the extra length of wire later
if you decide to cut more wire off to change the location
of a splice. You may have to adjust splice locations to
make certain that each splice is at least 1Ð1/2Ó
(40 mm) away from other splices, harness branches,
or connectors.
3. When replacing a wire, use a wire of the same size as
the original wire.
Check the stripped wire for nicks or cut stands. If the
wire is damaged, repeat the procedure on a new
section of wire. The two stripped wire ends should be
equal in length.
4. Select the proper clip to secure the splice.
To determine the proper clip size for the wire being
spliced, follow the directions included with your clips.
Select the correct anvil on the crimper. (On most
crimpers your choice is limited to either a small or
large anvil.)
Overlap the two stripped wire ends and hold them
between your thumb and forefinger as shown in the
figure.
The center the spline clip (1) under the stripped wires
and hold it in place.cOpen the crimping tool to its full width and rest one
handle on a firm flat surface.
cCenter the back of the splice clip on the proper anvil
and close the crimping tool to the point where the back
of the splice clip touches the wings of the clip.
cMake sure that the clip and wires are still in the correct
position. Then, apply steady pressure until the
crimping tool closes as shown in the figure.
2
11

WIRING SYSTEM 8DÐ399
Diagnosis
Diagnosis Procedure
1. Check to see if the battery voltage is normal.
2. Check to see if the fuse is normal.
3. Replace the antiÐtheft & keyless entry control unit with one reserved for test. If a trouble recurs even after replacing
the control unit, find out the cause of the trouble by referring to ÒSystem check procedureÓ and the following list.
ITEM MALFUNCTION POSSIBLE CAUSE DETECTING METHOD REMARKS
ANTIÐTHEFT
indicator light
does not flash
ANTIÐTHEFT
indicator light
does not turn off.
(Steadily on)
When door is
opened by pulling
up locking knob,
alarm does not
operate
Alarm does not
stop. Indicator light
does not change
to fully ON
condition, or does
not come on at
all.Burnt out indicator
light bulb possible.
Refer to ÒConnector
check tableÓ in this
system.
Refer to ÒConnector
check tableÓ in this
system.
Refer to ÒConnector
check tableÓ in this
system.
Refer to ÒConnector
check tableÓ in this
system.
Refer to ÒConnector
check tableÓ in this
system.
Refer to ÒConnector
check tableÓ in this
system. Defective contact of door switch,
or open circuit in door switch
wiring.
Short circuit in the detect switch.
Engine hood, doors and tailgate
are not fully closed and locked.
Defective door switch, or short
circuit in switch wiring.
Defective tamper switch, or short
circuit in wiring.
Defective lock switch, or short
circuit in wiring.
Defective engine hood switch, or
short circuit in wiring.
Defective tailgate switch, or short
circuit in wiring.
Defective control unit.
Poor contact of lock switch, or
open circuit in wiring.
Broken wire in wiring to headlight
and horn, or a blown fuse.
Defective contact of detect
switch, or damaged switch wiring.With door open, dome light and
courtesy light do not come on.
Check the control unit connector.
Check to see if doors are closed
and locked.
Dome light and courtesy light
remain lit on after closing doors.
Check the control unit connector.
Check the control unit connector.
Check the control unit connector.
Luggage room light remains lit
after closing tailgate.
Check alarm operation (See No.
46 of ÒSystem check procedureÓ),
possible cause is a poor contact
of lock switch of an open circuit in
wiring.
Check to see if headlights go out.
Check the control unit connector.
Check the control unit connector. A
C
D
E B

8DÐ400 WIRING SYSTEM
ITEM MALFUNCTION POSSIBLE CAUSE DETECTING METHOD REMARKS
Even when door
unlocked with
key, alarm
operates.
Alarm does not
operate even with
tailgate open.
Even when
tailgate is opened
with key, alarm
does not stop.
Even when
engine hood is
opened with
remote release,
alarm does not
operate
Even when
starter switch is
turned, alarm
does not stop
Indicator light
continues
flashingRefer to ÒConnector
check tableÓ in this
system.
Refer to ÒConnector
check tableÓ in this
system.
Refer to ÒConnector
check tableÓ in this
system. Defective contact of detect
switch, or damaged switch wiring.
Door detect switch is assembled
to wrong door.
Defective contact of tailgate
switch, or defective wiring.
Defective contact of tailgate
detect switch, or damage wiring.
Damaged engine hood switch or
wiring.
Defective contact of starter
switch.
Damaged door switch, or a short
circuit in wiring.
Damaged tamper switch, or a
short circuit in wiring.Check the control unit connector.
When key is turned to lock
position, alarm stops.
When luggage room light switch
is turned on with tailgate open,
luggage room light does not
come on.
Check the control unit connector.
With starter switch turned to
ÒACCÓ position, audio, cigarette
lighter and door mirrors (on
ÒACCÓ circuit) do not operate.
After closing door, dome light and
courtesy light remain on.
Check the control unit connector. F
G
H
I
J
K

WIRING SYSTEM 8DÐ401
System Check Procedure
STEP OPERATION ITEM TO BE CHECKEDITEM OF
REMARKS
MALFUNCTION
Be sure to lock door
with locking knob.
Activate alarm
device.
All doors are
unlocked.
With key set at unlock
position, check to see
if alarm stops.
All doors are
locked.
Activate alarm
device.
Activate alarm
device.
Only left rear door
is unlocked. Check to see if engine hood,
tailgate and doors are closed and
locked.
Check to see if indicator light
remains lit off.
Check to see if indicator light
flashes.
Check to see if dome light and
courtesy light illuminate.
Check to see if indicator light
changes from flashing to steadily
on.
Check to see if indicator light
turns off in about 10 seconds.
Check to see if alarm operates
(with headlight flashing, and horn
blaring intermittently.)
Check to see if alarm stops.
Check to see if indicator light
turns on.
Check to see if indicator light
goes off after about 10 seconds.
Check to see if alarm does not
operate.
Check to see if indicator light
turns on.
Check to see if indicator light
goes off after about 10 seconds.
Check to see if alarm starts. Turn starter key to ÒONÓ position.
Open windows fully.
Pull out starter key after turning it
back to ÒOFFÓ position.
Unlock left front door with locking
knob.
Open left front door. (And get out
of the vehicle.)
Close left front door.
Lock left front door.
Wait about 10 seconds
Unlock left front door with locking
knob.
Insert key into key cylinder of left
front door and turn it in unlock
direction.
Lock left front door.
Wait for about 10 seconds.
Unlock left front door with key.
Lock left front door with key.
Wait for about 10 seconds.
Unlock left rear door with locking
knob.K
A
B
C
D
E
B
C
F
B
C
D 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

8DÐ404 WIRING SYSTEM
STEP OPERATION ITEM TO BE CHECKEDITEM OF
REMARKS
MALFUNCTION
Activate alarm
device. Check to see if indicator light
goes off after about 10 seconds.
Check to see if alarm operates.
Check to see if alarm stops. Wait about 10 seconds.
Open engine hood with engine
hood release handle.
Insert key into starter switch and
turn it to ÒACCÓ position.C
I
J 45
46
47
NOTE:When the connector of the antiÐtheft & keyless entry control unit is disconnected, the starter is inoperative.
In the checking of short wheel base model, Step Nos. 16 through 21 and Step Nos. 31 through 36 are omitted.

WIRING SYSTEM 8DÐ405
TERMINAL
CONNECTIONCHECK
OPERATIONCIRCUIT
NO. ITEM CONDITION
1 FRT door switchÐLH, RH ContinuityOpen door Continuity
Close door No continuity
2 RR door switchÐLH, RH ContinuityOpen door Continuity
Close door No continuity
3Ñ Ñ Ð Ð
4 Door lock key switchÐLH, RH Continuity Lock with key Continuity
5 FRT door lock switchÐLH, RH Continuity Lock Continuity
6 Tailgate switch ContinuityOpen tailgate Continuity
Close tailgate No continuity
8 AntiÐtheft horn Voltage Ð Approx. 12V
10 Battery Voltage Ð Approx. 12V
11 Door switch ContinuityUnlock with locking knob Continuity
Lock with locking knob No continuity
12 Engine hood switch ContinuityOpen engine hood Continuity
Close engine hood No continuity
13 Detect switch ContinuityUnlock with key Continuity
Lock with key No continuity
14 Door lock key switch Continuity Unlock Continuity
15 FRT door lock switchÐLH, RH Continuity Unlock Continuity
16 Tamper switch Continuity Ð No continuity
17 Ground Continuity Ð Continuity
18 Starter switch Voltage Starter switch ÒACCÓ Approx. 12V
19 Indicator light Voltage Ð Approx. 12V
20 Dome light Voltage Dome light ÒDOORÓ position Approx. 12V
21 Anti-theft relay Voltage Ð Approx. 12V
22 Starter relay VoltageMode switch ÒPÓ or ÒNÓ Approx. 12V
Clutch pedal depressed Approx. 12V
Connector Check Table
Check the antiÐtheft & keyless entry control unit harness side connector BÐ20 by using a circuit tester.

WIRING SYSTEM 8DÐ449
I-9
Inspection of a waveform by oscilloscope
1. Check the waveform of the meter assembly connector 9 I-9 (Tachometer pulse).
Normal waveform
OV
6.7m sec.
MIN. 0.4VMAX. 4.3V
Engine revolution : 3000 rpm
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