1998 NISSAN PATROL Heather And Air Conditioner Workshop Manual

Insufficient Heating
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT HEATING
SYMPTOM:
+Insufficient heating.
Inspection ¯ow
*1: HA-40
*2: HA-40*3: HA-22 *4: HA-21
RHA604G
TROUBLE DIAGNOSESMANUAL
HA-39

CONTROL LINKAGE ADJUSTMENT
Water cock control rod
+When adjusting water cock control rod, ®rst disconnect
temperature control cable from air mix door lever and then
adjust control rod. Reconnect temperature control cable
and readjust it. (Refer to TEMPERATURE CONTROL
CABLE.)
1. Push air mix door lever in direction of arrow.
2. Pull control rod of water cock in direction of arrow so as to make
clearance of about 2 mm (0.08 in) between ends of rod and link
lever and connect the rod to door lever.
After connecting control rod, check it operates properly.
Temperature control cable
1. Move the temperature control knob to the full hot position.
2. Set the air mix door lever in the full hot position.
3. Pull on the cable cover in the direction of the arrow, then clamp
it.
After positioning control cable, check that it operates properly.
SHA522E
RHA632EA
TROUBLE DIAGNOSESMANUAL
Insufficient Heating (Cont'd)
HA-40

Air Outlet
TROUBLE DIAGNOSIS PROCEDURE FOR AIR OUTLET
SYMPTOM:
+Air does not change.
Inspection ¯ow
*1: HA-42
*2: HA-22*3: HA-21 *4: HA-13
RHA605G
TROUBLE DIAGNOSESMANUAL
HA-41

CONTROL LINKAGE ADJUSTMENT
Mode control cable
1. Turn the mode control knob to the DEF position.
2. Set the side link in the DEF position by hand.
3. Pull on the cable cover in the direction of the arrow, then clamp
it.
After positioning control cable, check that it operates properly.
RHA630EA
TROUBLE DIAGNOSESMANUAL
Air Outlet (Cont'd)
HA-42

Magnet Clutch
TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH
SYMPTOM:
+Magnet clutch does not operate when A/C switch and fan switch are ON.
Inspection ¯ow
*1: HA-119
*2: HA-44*3: HA-22 *4: HA-21
RHA606G
TROUBLE DIAGNOSESMANUAL
HA-43

DIAGNOSTIC PROCEDURE
SYMPTOM: Magnet clutch does not engage when A/C switch
and fan switch are ON.
CHECK POWER SUPPLY FOR COM-
PRESSOR.
Disconnect compressor harness connector.
Do approx. 12 volts exist between compres-
sor harness terminal No.j
1and body
ground?
No
cYe s
Check magnet clutch coil.
NG
Replace magnet clutch.
Refer to HA-123.
Disconnect A/C relay.
Note
CHECK CIRCUIT CONTINUITY
BETWEEN A/C RELAY HARNESS TERMI-
NAL NO.j
7AND COMPRESSOR HAR-
NESS TERMINAL NO.j1.
Continuity should exist.
If OK, check harness for short.
OK
CHECK POWER SUPPLY FOR A/C
RELAY.
Disconnect A/C relay.
Do approx. 12 volts exist between A/C
relay harness terminal Nos.j
1,j6and
body ground?
Ye s
cNo
CHECK POWER SUPPLY
CIRCUIT AND 10A (No.
) FUSES AT FUSE
BLOCK.
Refer to EL section (``Wiring
Diagram'', ``POWER SUP-
PLY ROUTING'').
CHECK A/C RELAY AFTER DISCON-
NECTING IT.
Refer to HA-47.
OK
cNG
Replace A/C relay.
jA(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
RHA747FE
RHA607GA
RHA608G
.
.
.
.
.
.
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont'd)
HA-44

jA
Reconnect A/C relay.
CHECK COIL SIDE CIRCUIT OF A/C
RELAY.
Do approx. 12 volts exist between ECM
(ECCS control module) harness terminal
No.j
9and body ground?
Ye s
cNo
Disconnect A/C relay.
Disconnect ECM (ECCS
control module) harness
connector.
Note
CHECK CIRCUIT CONTI-
NUITY BETWEEN A/C
RELAY HARNESS TERMI-
NAL NO.j
2AND ECM
(ECCS CONTROL MOD-
ULE) HARNESS TERMI-
NAL NO.j
9.
Continuity should exist.
If OK, check harness for
short.
CHECK VOLTAGE FOR ECM (ECCS con-
trol module).
Do approx. 12 volts exist between ECM
(ECCS control module) harness terminal
No.j
46and body ground?
Ye s
cNo
CHECK ECM (ECCS con-
trol module). Refer to EC
section.
Disconnect ECM (ECCS control module)
harness connector.
Disconnect dual-pressure switch harness
connector.
Note
CHECK CIRCUIT CONTINUITY
BETWEEN ECM (ECCS CONTROL MOD-
ULE) HARNESS TERMINAL NO.j
46AND
DUAL-PRESSURE SWITCH HARNESS
TERMINAL NO.j
2.
Continuity should exist.
If OK, check harness for short.
OK
CHECK DUAL-PRESSURE SWITCH.
Refer to HA-47.
OK
cNG
Check refrigerant charge
amount.
OK
Disconnect thermo control amp. switch
harness connector.
Replace dual-pressure
switch.
Note
CHECK CIRCUIT CONTINUITY
BETWEEN DUAL-PRESSURE SWITCH
HARNESS TERMINAL NO.j
1AND
THERMO CONTROL AMP. HARNESS
TERMINAL NO.j
3.
Continuity should exist.
If OK, check harness for short.
OK
j
B
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
RHA749FA
RHA609G
RHA610G
RHA611G
RHA612G
.
.
.
.
.
.
.
..
.
.
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont'd)
HA-45

jB
CHECK POWER SUPPLY FOR THERMO
CONTROL AMP.
Disconnect thermo control amp. harness
connector.
Do approx. 12 volts exist between thermo
control amp. harness terminal No.j
1and
body ground?
Ye s
cNo
CHECK POWER SUPPLY
CIRCUIT AND 10A FUSES
AT FUSE BLOCK.
Refer to EL section (``Wiring
Diagram'', ``POWER SUP-
PLY ROUTING'').
CHECK BODY GROUND CIRCUIT FOR
THERMO CONTROL AMP.
Turn A/C switch ON.
Does continuity exist between thermo
control amp. harness terminalj
2and
body ground?
Ye s
cNo
CHECK THERMO CON-
TROL AMP.
Refer to HA-47.
Disconnect A/C switch harness connector.
CHECK A/C SWITCH.
Refer to HA-47.
OK
cNG
Replace A/C switch.
Disconnect fan switch harness connector.
Note
CHECK CIRCUIT CONTINUITY
BETWEEN A/C SWITCH HARNESS
TERMINAL NO.j
2AND FAN SWITCH
HARNESS TERMINAL NO.j
6.
Continuity should exist.
If OK, check harness for short.
OK
Note
CHECK BODY GROUND CIRCUIT FOR
FAN SWITCH.
Does continuity exist between fan switch
harness terminal No.j
5and body
ground?
Ye s
CHECK FAN SWITCH.
Refer to HA-31.
cNG
Replace fan switch.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
RHA615G
RHA616G
RHA613G
RHA614G
.
.
.
.
.
.
.
.
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont'd)
HA-46