relay ISUZU TROOPER 1998 Service User Guide

00 Ð 14 SERVICE INFORMATION
4JX1 (LHD)
B-2 BODY-LH
BODY-RH
5B
8B / R
8 B
+
_
P - 6
BODY
30B
P - 1
P - 5
P - 10
P - 7
ENG.
FRAME
P - 2
FL-1
80A MAIN
I-232
I-23
I-236
1A/C SW
BLOWER
MOTORI-42 I-42
I-421 3
216
0.5 LG 0.5 LG0.5 LG
0.5LG1
2
C-25
C-25
H-141
5W
B-19
0.5BR
X-5 X-5
X-5 X-5
34 A/C THERMO
RELAYTHERMO
SW
RELAY
12
0.5 P/G 0.5 P/GPRESSURE SW
(CONDENSER)H-13
E-271
2L/R
I-41
I-18
I-18
I-18
I-18 1.25L/O
1.25L/Y
0.85L/W 3
36
5
2 4
1 6
FAN SW HEATER BEZEL
ILLUMINATION
I-23 I-23
I-18
I-18 3
5
4
10.3 R/G0.85 G/R
TAIL RELAY (4)
H-4815
2BLOWER
RESISTOR
I-41
I-41
I-41
I-41
2L/B
2 B
0.3G/Y
1.25B
M
B-51
2B-5
B-361
B-36
B-36 B-362
343L/R 3L
C-19
25A BLOWERHEATER &
A/C RELAY
0.5B
ELECTRONIC
THERMOSTAT
MAGNETIC
CLUTCH
5W 3W
X-12 X-12
X-12 X-12
34 12
B-44
B-441
H-1214
2
0.3
G/W ECM
(JI-31)
0.5
Y/G
B-491
B-49
2
0.3G/Y
DIODE
FULL HOT
SW
H-135
CERAMIC
HEATER
B-48
B-48
2 1
CERAMIC HEATER
RELAY
2B
0.5G/B FL-3
40A C/HEATER
3W/L
2B
3W/G 3W/G
0.5BR
C-20 10A
AIR CON.
0.5BR
0.5 BR17H-16
0.3G/Y
0.3G/Y0.3G/Y5W
0.5O/G
STARTER SW
(ACC)
4
H-482L/B
0.5G/O 0.5G/O 0.5G/O
0.5G/O
H-2610
0.5 G/W
0.5 G/Y 0.5 G/B
ECM
(J1-23)
H-4112
0.5 G/W
H-417
H-62
H-174
H-41 5
X-21 X-21
X-21 X-21
43 21H-919H-2614
ILLUMINATION
CONTROLLER
D08RY00134

SERVICE INFORMATION 00 Ð 15
D08RY00135
ECM
(J2-11)
0.5 L/P
I-25
I-25
3
I-25 2
I-25 6
I-25
5
4
1H-166
0.3R/G0.85G/R 0.85G/R
ILLUMINATION
CONTROLLER TAIL RELAY(4)
ENGINE
WARMING
SW
1.25B 0.5B
C-74C-741 2THERMO SWH-2417
0.5G/W 0.5G/W
0.5 L/P
0.5G/B
H-2516
H-4216
H-52
0.5B
H-1615

SERVICE INFORMATION 00 Ð 17
FAN CONTROL KNOB (FAN SWITCH)
Current flows to the blower motor through the
Heater & A/C relay (B-36) to activate the rotation of
the blower motor by turning ÒONÓ the fan controlknob (fan switch). Blower motor speed is controlled
in stages by the resistor, by operating the switch
from ÒLOWÓ to ÒHIGH.Ó
12
34
B-36B-1B-2
1234561
2123
45 6
I-41B-5I-18
1
2
B-36RELAY;
HEATER & ACC-19
25A
BLOWER
2
3
6
4
1
6
3
5
2
1
MBLOWER
MOTOR2
1
RHD
OFF
B-5B-5
I-18
BLOWER
RESISTOR FAN SW.
I-41
B-1
B-2(LHD) BODY-RH (RHD) BODY-LH
D08RY00167

00 Ð 18 SERVICE INFORMATION
BLOWER MOTOR DOES NOT RUN
·IS NO. C-19 (25A) FUSE OK?
·IS BLOWER RELAY (B-36) OK?
YESNO
REPLACE
NO
REPLACE
NO
REPLACE
NO
REPLACE CONTROL LEVER ASSEMBLY
NO
REPLACE
NO
OPEN CIRCUIT BETWEEN NO. C-19
(25A) FUSE AND NO. B5-1 (NO. B5-2;
RHD)
YES
·IS RESISTOR OK?
YES
·IS FAN CONTROL KNOB (FAN SWITCH) OK?
YES
·IS BLOWER MOTOR OK?
YES
·TURN THE IGNITION SWITCH ÒONÓ (ENGINE IS
RUNNING)
·FAN CONTROL KNOB (FAN SWITCH) ÒONÓ
·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT
AT CHASSIS SIDE CONNECTOR TERMINAL NO. B5-1
(NO. B5-2; RHD)
YES
POOR GROUND OR OPEN CIRCUIT EITHER BETWEEN
CHASSIS SIDE CONNECTOR TERMINAL NO. B5-2
(NO. B5-1; RHD) AND NO. I-41-2 OR NO. I18-1 AND BODY
GROUND NO. B-2 (NO. B-1; RHD)

00 Ð 20 SERVICE INFORMATION
CERAMIC HEATER
When the fan control knob (fan switch) turns on
with the temperature control knob set to ÒFULL
HOTÓ (full hot switch ÒONÓ), the ceramic heater in
the heater unit turns on and the blow temperature
goes up. When the ceramic heater turns on, FICDstarts to operate at the same time. When either one
of the fan switch, the full hot switch or the thermo
switch (which turns on when the coolant tempera-
ture gets below 80°C (176°F) turns off, the ceramic
heater also turns off.
FL-3
40A
C/HEATER
RELAY;
HEATER A/CECM
(J1-23)
24
13
C-20
10A
A/C
FL-1
80A
MAIN
B-18B-1
B-36
1
3
X-12
2
4
1
3
X-21
2
4
1
2
1
2
4
13
24
1
1
2CERAMIC
HEATER
FAN SW.
B-19
B-48
I-18
B-44
B-49
RELAY;
THERMO
SW
RELAY;
CERAMIC
HEATER
DIODE
FULL HOT
SW.
B-1
B-48
1
21
22112
B-49
I-18
213
5 4612
34
B-36X-12X-21
1234
B-44
(RHD)
B-2(LHD)
B-2
D08RWD66

SERVICE INFORMATION 00 Ð 21
CERAMIC HEATER DOES NOT OPERATE
·ARE NO. FL-3 (40A) AND NO. C-20 (10A) OK?
YESNO
REPLACE
REPLACE
REPLACE
REPLACE
·ARE A/C AND CERAMIC HEATER RELAYS OK?
YESNO
·ARE BLOWER MOTOR AND FAN SW. OK?
YESNO
·IS FULL HOT SW. OK?
·DOES TEMP. CONTROL LINK (HEATER UNIT)
OPERATE CORRECTLY?
YESNO
REPLACE·TURN THE IGNITION SW. ÒONÓ (ENGINE IS RUNNING)·CERAMIC HEATER ÒONÓ
·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. B48-1
YESNO
OPEN CIRCUIT·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. B48-2
YESNO
CERAMIC HEATER DEFECTIVE·CHECK THE CERAMIC HEATER OR CERAMIC HEATER-
RELATED HARNESS FOR A POOR GROUND AND REPAIR
IT AS NECESSARY
YESNO
·DOES CONTROL LEVER CABLE OPERATE CORRECTLY?·IS THERMO RELAY OK?
YESNO
NOYES
ADJUST OR REPLACEREPAIR OR REPLACE
TEMP. CONTROL UNIT

00 Ð 22 SERVICE INFORMATION
CERAMIC HEATER DOES NOT STOP
WHEN THE IGNITION SW. ÒOFFÓ, DOES CERAMIC HEATER
STOP?
YESNO
CERAMIC HEATER RELAY DEFECTIVE·SHORT CIRCUIT BETWEEN CHASSIS SIDE RELAY TERMINAL
NO. X12-3 AND CHASSIS SIDE CONNECTOR TERMINALNO. B49-1

SERVICE INFORMATION 00 Ð 27
MAGNETIC CLUTCH
When the A/C switch and the fan control knob (fan
switch) are turned on with the engine running,
current flows through the thermostat and the com-
pressor relay to activate the magnetic clutch.
The air conditioning can be stopped by turning off
the A/C switch or the fan control knob (fan switch).
However, even when the air conditioning is in oper-ation, the electronic thermostat, the pressure switch
or the PCM (6VD1/6VE1 Engine) is used to stop the
air conditioning temporarily by turning off the mag-
netic clutch in the prearranged conditions to reduce
the engine load which is being caused by the rise in
the engine coolant temperature, and the accelera-
tion of the vehicle, etc.
123
45 6
RELAY; A/C
B-36C-20
10A
A/C FL-1
80A
MAIN
1
2
B-2
C-25
2
4
X-5
1
3 (3)
(1)
4
13
24
1
A/C SW.
FAN SW.
I-23
PRESSURE
SW.
RELAY;
THERMOSTAT
B-2
X-7 C-25
C-1C-3E-3I-23
BATTERY
X-7
RELAY: A/C
COMPRESSOR
1
E-3
MAGNETIC
CLUTCHMg
OFF
I-18
2
6
1
321123
12
3412
11
213
5 46
I-18
X-5
B-1(LHD) (RHD)
B-1
1
2 34
W/ CONDENSER
FAN
2
4
1
3
C-3PCM (E15)
C-1PCM (B14)
3
1
2
ELECTRONIC
THERMOSTAT
I-42
I-42B-36
Pin number with ( ); RHD
A1 A2 A3 A4 A5 A6 A7 A8 A9A10 A11 A12 A13 A14 A15 A16B1 B2 B3 B4 B5 B6 B7 B8 B9B10 B11 B12 B13 B14 B15 B16E1 E2 E3 E4 E5 E6 E7 E8 E9E10 E11 E12 E13 E14 E15 E16F1 F2 F3 F4 F5 F6 F7 F8 F9F10 F11 F12 F13 F14 F15 F16
6VD1/6VE1 ENGINE
D08RY00295

00 Ð 28 SERVICE INFORMATION
MAGNETIC CLUTCH DOES NOT RUN
·TURN THE STARTER SWITCH ON AND START THE
ENGINE.
·TURN THE FAN SWITCH ON.
·DOES THE BLOWER MOTOR RUN?
YESNO
REFER TO THE DIAGNOSIS PROCEDURE FOR
ÒBLOWER MOTOR DOES NOT RUNÓ.·IS THE FUSE C-20 (10A) NORMAL?
YESNO
REPLACE THE FUSE.·DISCONNECT THE A/C SWITCH CONNECTOR AND
REMOVE THE A/C SWITCH.
·IS THE A/C SWITCH NORMAL?
YESNO
YESNO
REPAIR AN OPEN CIRCUIT BETWEEN THE
FUSE C-20 AND I23-2.·REINSTALL THE A/C SWITCH AND DISCONNECT THE DUAL
PRESSURE SWITCH (OR TRIPLE PRESSURE SWITCH) CON-
NECTOR C25.
·TURN THE A/C SWITCH ON.
·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR C25-1?
YESNO
REPLACE THE SWITCH.·RECONNECT THE CONNECTOR C25 AND DISCONNECT THE
A/C THERMO RELAY CONNECTOR X5.
·IS THERE CONTINUITY BETWEEN HARNESS SIDE CONNEC-
TOR C25-2 AND X5-1?
YESNO
REPAIR AN OPEN CIRCUIT BETWEEN I23-6
AND C25-1.·IS THE DUAL PRESSURE SWITCH (OR TRIPLE PRESSURE
SWITCH) NORMAL?
YESNO
REPAIR OR REPLACE THE SWITCH.·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR I23-2?

SERVICE INFORMATION 00 Ð 29
·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR X5-2?REPAIR AN OPEN CIRCUIT.
YESNO
·IS THE A/C THERMO RELAY NORMAL?REPAIR AN OPEN CIRCUIT BETWEEN THE
FUSE C-20 AND X5-2.
YESNO
·DISCONNECT THE ELECTRONIC THERMOSTAT CONNEC-
TOR I42.
·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR I42-3?
YESNO
·IS THERE CONTINUITY BETWEEN HARNESS SIDE CON-
NECTOR X5-3 AND I42-1?REPAIR AN OPEN CIRCUIT BETWEEN I23-6
AND I42-3.
YESNO
·DISCONNECT THE PCM CONNECTORS.
·IS THERE CONTINUITY BETWEEN HARNESS SIDE CON-
NECTOR X5-4 AND PCM C3-E15?REPAIR AN OPEN CIRCUIT.
YESNO
·IS THERE CONTINUITY BETWEEN HARNESS SIDE CON-
NECTOR I42-2 AND THE GROUND?REPAIR AN OPEN CIRCUIT.
YESNO
·DISCONNECT THE A/C COMPRESSOR RELAY CONNEC-
TOR X7.
·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR X7-1 AND X7-2?REPLACE THE ELECTRONIC THERMOSTAT.
YESNO
·RECONNECT X5 AND I42.
·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR PCM C3-E15?REPAIR AN OPEN CIRCUIT.
REPLACE THE RELAY.