ECU ISUZU TROOPER 1995 Service Manual

CHASSIS ELECTRICAL 8-9
ABBREVIATIONS
Abbreviation
Meaning of Abbreviation Abbreviation Meaning of Abbreviation
A Ampere
(S) LH Left
hand
ABS Anti-lock brake system LWB Long wheel base
ASM Assembly M!f Manual transmission
AC Alternating current OD Over drive
A/C
Air conditioner OPT Option
ACC Accessories QOS Quick on start
A/T Automatic
transmission
RH Right hand
C/8 Circuit
breaker
RR Rear
CSD Cold start device RWAL Rear
wheel anti-lock brake system
DIS Direct ignition system SRS Supplemental restraint system
EBCM Electronic brake control module
ST Start
ECGI Electronic control gasoline injection STD Standard
ECM Engine control module sw Switch
ECU Electronic control unit SWB Short wheel
base
EFE Early fuel evaporation TCM Transmission
control module
4A/T 4-speed
automatic transmission
3A/T 3-speed
automatic transmission
4X4 Four-wheel drive
v Volt
FL Fusible link vsv Vacuum switching valve
FRT Front w Watt {S)
H/L Headlight WOT Wide open throttle
IC Integrated circuit WI With
IG Ignition W/0 Without
kW
kilowatt

CHASSIS ELECTRICAL 8-63
1-1. BOTH HEADLIGHTS INOPERATIVE
• IS THE LIGHTING RELAY NORMAL? I
I
I I
YES I NO I
I
I
• IS [[I[] GROUNDED SECURELY? I REPLACE THE LIGHTING RELAY I
I
I
I
YES I NO I
I I
• IS THE DIODE NORMAL? J GROUND IT SECURELY I
I
I I
YES I NO I
I
I
• DISCONNECT THE LIGHTING SW CONNECTOR REPLACE THE DIODE J • IS THE BATTERY VOLTAGE APPLIED BETWEEN THE HARNESS
SIDE CONNECTOR 1 [[I[j AND GROUND?
I
I I
YES I NO I
I I
• REMOVE THE LIGHTING SW REPAIR A POOR CONNECTION AT THE CONNECTORS
• IS THERE CONTINUITY BETWEEN 1 [[I[] AND 7 ~WHEN OR AN OPEN CIRCUIT BETWEEN THE FUSUBLE LINK SETTING THE LIGHTING SWAT THE HEADLIGHT POSITION? FL-1 (80A) AND 1 ~
I
I I
I YES I NO I
1 I
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN REPAIR OR REPLACE THE LIGHTING SW I OPEN CIRCUIT BETWEEN THE HARNESS SIDE CONNECTOR 1WI] AND~ (GROUND) OF THE LIGHTING SW

CHASSIS ELECTRICAL 8 .... 65
1-4. HEADLIGHTS IN HIGH-BEAM INOPERATIVE
• DISCONNECT THE CONNECTOR DIMMER•
PASSING SW (COMBINATION SWl
• WHIT THE SWITCH AT HIGH-BEAM, IS THERE
CONTINUITY BETWEEN THE SW CONNECTOR TERMINALS
15~AND16~7
I
I I
YES I NO I
I I
REPAIR A POOR CONNECTION AT THE CONNECTORS REPAIR OR REPLACE THE DIMMER•
OR AN BROKEN WIRE BETWEEN 15[[]IJAND 16[Jf[J PASSING SW
1-5. HEADLIGHT BEAM DOES NOT CHANGE
• DOES THE LEVER OF THE DIMMER•PASSING SW
OPERATE SMOOTHLY AND SECURELY?
I
I I
YES I
I NO I
I I
• DISCONNECT THE CONNECTOR OF THE DIMMER PASSING I REPAIR OR REPLACE THE DIMMER•PASSING sw J sw.
• WITH THE SWITCH AT THE LOW-BEAM POSITION, IS THERE CONTINUITY BETWEEN 13[[g] AND 16(]]U 1 ALSO, WITH IT AT THE HIGH-BEAM POSITION, IS THERE CONTINUITY BETWEEN 15(]]UAND 16 []}[) 1
I
l
I NO I
I
l REPAIR OR REPLACE THE DIMMER•PASSING SW J

8-74 CHASSIS ELECTRICAL
FOG LIGHT SWITCH
~ INSPECTION
I tgj Check the continuity between the connector ter­
minals
while operating the switch. (Fig. 8-94)
Replace the switch when the result of inspection
is found abnormal.
ru~
IT
2 [II
161514131
c-
Fig. 8-94
B REMOVAL (FIG. 8-95)
TI ';
Preparation: Disconnect the battery ground cable.
Fig.
8-95
I I 1. Front console I assembly
1. Front console assembly
• Remove four screws.
• Remove the transmission shift leve knob
(M!r only).
• Remove the transfer shift lever knob.
• Disconnect the seat heater switch con ectors
(If so equipped).
• Disconnect the POWER & WINTER switch
connectors
(A/T only).
2.
Lower cluster assembly
• Remove three screws.
• Disconnect the cigar lighter connector .
• Remove the cigar lighter illuminatio bulb
socket.
• Disconnect the ashtray illuminatio bulb
connector.
3.
Instrument panel driver lower cover
• Remove the engine hood opener.
• Remove three screws and clip.
• Disconnect four fasteners.
4.
Instrument panel cluster assembly
• Remove five screws.
• Disconnect the four clips at top of instr ment
panel cluster assembly.
5. Fog
light switch
• To remove the switch, pushing the loc from
the back side of the cluster assembly.
B INSTALLATION
To install, follow the removal steps in the r verse
order, noting the
following point:
1. Push in the switch with your fingers un il the
switch is locked securely.
LIGHTING RELAY
~ INSPECTION
Check to see if there is any continuity be ween
the relay terminals. (Fig.
8-96)
Replace the relay when the result of in spec ion is
found abnormal.
CD-3 · · · · • · · · No continuit
(When the battery voltage is applied
between
4 -s)
•

CHASSIS ELECTRICAL 8 -83
1. BOTH TAILLIGHTS INOPERATIVE
• IS FUSE F-12 (15Al NORMAL? I
I
I
I
YES I NO I
I I
• IS THE TAIL RELAY NORMAL? I REPLACE THE FUSE I
I
I
I
YES I NO I
I I
•
IS[&!] GROUNDED SECURELY? I REPLACE THE TAIL RELAY I
I
I
l
YES I NO I
I I
• REMOVE
THE CONNECTOR OF THE LIGHTING GROUND I R-41 SECURELY I SWITCH
• IS THERE ANY CONTINUITY BETWEEN 81 B-121
AND SIT[] WHEN THE SWITCH IS TURNED
TO PARKING OR HEADLIGHT POSITION?
l
I I
YES I NO I
I I
• IS
THE BATTERY VOLTAGE APPLIED BETWEEN THE REPAIR OR REPLACE THE I
HARNESS SIDE CONNECTOR Bl B-121 AND THE LIGHTING SWITCH
GROUND?
I
I I
YES
I NO I
I I
REPAIR
A POOR CONNECTION AT THE CONNECTORS REPAIR A POOR CONNECTION AT THE
OR AN OPEN CIRCUIT BETWEEN 41 X-91 AND 151 H-321. CONNECTORS OR AN OPEN CIRCUIT OR 1 [friJ ( 1 (K[]) AND[&!] BETWEEN FUSE 31 X-9IAND Bl B-121

CHASSIS ELECTRICAL 8-85
3. BOTH FRONT SIDE MARKER LIGHTS INOPERATIVE
• IS FUSE F-12 (15Al NORMAL? I
l
I I
YES I NO I
I I
• IS THE TAIL RELAY NORMAL? I REPLACE THE FUSE I
l
I I
YES I NO I
I I
• IS sl C-161 GROUNDED SECURELY? I REPLACE THE TAIL RELAY I
I
I
I
YES I NO I
I I
• REMOVE THE CONNECTOR OF THE LIGHTING
GROUND slc-16l SECURELY I SWITCH
• IS
THERE ANY CONTINUITY BETWEEN Bl B-121 AND 6CI[JWHEN THE SWITCH IS TURNED TO PARKING OR HEADLIGHT POSITION?
I
I I
YES I NO I
I I
• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE REPAIR OR REPLACE THE I
HARNESS SIDE CONNECTOR Bl B-121 AND THE LIGHTING SWITCH
GROUND?
I
I
I
YES I NO 1
I I
REPAIR A POOR CONNECTION AT THE CONNECTORS REPAIR A POOR CONNECTION AT THE
OR AN OPEN CIRCUIT BETWEEN 41 X-91 AND 91 H-411, CONNECTORS OR AN OPEN CIRCUIT OR 1 IC-221 111 C-311 lAND siC-161 BETWEEN FUSE 31 X-91 AND al B-121

8-86 CHASSIS ELECTRICAL
4. FRONT SIDE MARKER LIGHT ON THE LEFT (OR RIGHT) Sl DE
INOPERATIVE ~ :,, '.
;:: • IS THE FRONT SIDE MARKER LIGHT BULB ON THE I LEFT (OR RIGHT) SIDE NORMAL?
I
YES
I NO I
I
• IS THERE ANY CONTINUITY BETWEEN 9 I H-411
I
REPLACE BULB I
AND 2 I C-221 (2 I C-311 )?
I
YES
I NO I
I
REPAIR
A POOR CONNECTION AT THE CONNECTORS OR AN REPAIR A POOR CONNECTION AT THE CONNEC1 ORS
OPEN CIRCUIT BETWEEN 1 IC-221 111 C-311 I AND siC-161 OR AN OPEN CIRCUIT IN THE CIRCUIT
NOTE: Connector in parenthesis "( )" indicates the check point of the front side marker light on the rig tside.
5. LICENSE PLATE LIGHT INOPERATIVE
• IS THE TAILLIGHT NORMAL? I ~
I
YES I I NO I
I
•
IS THE LICENSE PLATE LIGHT BULB NORMAL? I I REPAIR THE TAILLIGHT (REFER TO DIAGNOSIS "BOTH TAILLIGHTS INOPERATIVE" IN THIS SECTI ON) I
I
YES j I NO l
I
• IS [[!]GROUNDED SECURELY? I I REPLACE
THE BULB I
I
YES I
I NO I
I
• IS THE BATTERY VOLTAGE APPLIED BETWEEN
I
I GROUND IT SECURELY I
I 11 G-BI AND THE GROUND? I
I
I YES I
I NO
I ~ I REPAIR A POOR CONNECTION AT THE CONNECTORS I I REPAIR A POOR
CONNECTION AT THE CONNECT pRS OR AN OPEN
CIRCUIT BETWEEN 2 I G-81 AND [fl;TI OR AN OPEN CIRCUIT IN THE CIRCUIT
•

LIGHTING SWITCH
Refer to "HEADLIGHT AND FOG LIGHT" in this
~ section.
ILLUMINATION CONTROLLER
Turning the illumination controller knob upward
increases the brightness
of each illumination light,
turning it downward decreases its brightness. The
knob is
installed on the ground circuit of the
illumination lights, turning it changes the resistance
of the controller. (Fig. 8-103)
Fig. 8-103
....._., ~ INSPECTION (FIG. 8-104)
Check the illumination controller function (Fig. 8-104)
Replace the illumination controller when the result of
inspection is found abnormal.
Fig.
8-104
+
Illumination
controller
CHASSIS ELECTRICAL 8-87
B REMOVAL (FIG. 8-105)
Preparation: Disconnect the battery ground cable.
This illustration is based on fog light SW removal.
Fig. 8-105
1. Front console assembly
2. Lower cluster assembly
3. Instrument panel driver lower cover
4. Instrument panel cluster assembly
• Refer to FOG LIGHT SWITCH removal steps
in this section.
5.
Illumination controller
• To remove the controller, pushing the lock
from the back side of the cluster assembly.
B INSTALLATION
To install, follow the removal steps in the reverse
order, noting the
following point.
1. Push in the switch with your fingers until the
switch is locked securely.

CHASSIS ELECTRICAL 8 -97
1-1 BOTH STOPLIGHTS INOPERATIVE
• IS FUSE C-14 (15A) NORMAL? I
l
l l
YES I NO l
I I
• IS [MJ SECURELY GROUNDED? I REPLACE THE FUSE l
I
I I
YES I NO I
I 1
• IS BATTERY VOLTAGE APPLIED TO 1 ~ (1 [[ill) GROUND IT SECURELY I OF THE STOPLIGHT SW (OR THE BRAKE SW)7
I
I I
YES I NO l
I I
• REMOVE THE STOPLIGHT SW (OR THE BRAKE SW). REPAIR A POOR CONNECTION AT CONNECTORS
• IS THERE ANY CONTINUITY BETWEEN 11 B-141 AND OR AN OPEN CIRCUIT BETWEEN THE FUSE C-14 (15Al
21 B-14I!OR 11 B-131 AND
4 ~ l OF THE SWITCH AND 1 I B-14 I (1 ~ ).
WHEN PUSH ROO IS OUT?
I
I I
YES I NO I
I T
• DOES THE PUSH ROD OF THE STOPLIGHT SW (OR THE REPLACE THE STOPLIGHT SW (OR BRAKE SW) . 1 BRAKE SW) OPERATE SMOOTHLY?
I
I I
YES I NO I
J -1
REPAIR A POOR CONNECTION OF CONNECTORS OR AN REPLACE THE STOPLIGHT SW (OR BRAKE SW). I OPEN CIRCUIT BETWEEN 21]}!] 141 B-131 lAND 10! H-321

8 -98 CHASSIS ELECTRICAL
1-2 STOPLIGHT ON THE LEFT (OR RIGHT)
SIDE INOPERATIVE
~
--
' "• IS THE STOPLIGHT BULB ON THE LEFT (OR RIGHT) SIDE NORMAL? l •
I
I
I
YES
j NO I
I I
• IS THERE ANY CONTINUITY BETWEEN
THE STOPLIGHT REPLACE THE BULB I CONNECTOR 5 []}] 15(]]] I AND 10 IH-32 I?
I
I I
YES
I NO I
J I
REPAIR A POOR CONNECTION AT CONNECTORS OR AN REPAIR A POOR CONNECTION AT CONNECTO qs OR
OPEN CIRCUIT BETWEEN 1 [[[) 11[[[) I AND []I) AN OPEN CIRCUIT IN THE CIRCUIT
1-3 HIGH MOUNT STOPLIGHT INOPERATIVE
• IS ["ill SECURELy GROUNDED? I .~
I
I I
YES
I NO I
I I
• REMOVE THE HIGH MOUNT STOPLIGHT
GROUND IT SECURELY I
• IS THERE ANY CONTINUITY BETWEEN THE HIGH MOUNT
STOPLIGHT CONNECTOR 1 []TI AND 2 ~
I
I I
YES
j NO I
I I
• IS THE BATIERY VOLTAGE
APPLIED BETWEEN 1W] AND REPAIR OR REPLACE THE HIGH MOUNT STOPLIG ~T I THE GROUND WHEN THE BRAKE PEDAL IS DEPRESSED?
I
I I
YES j NO I
I 1
• REPAIR A POOR CONNECTION AT THE CONNECTORS OR REPAIR A POOR CONNECTION AT THE CONNECT DRS
AN OPEN
CIRCUIT BETWEEN 2 ~AND []I] OR AN OPEN CIRCUIT BETWEEN 1 [§TIANO 1 W±ill
~
•