1998 NISSAN PATROL Heather And Air Conditioner Workshop Manual

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
46,j21
AND DUAL-PRESSURE SWITCH HAR-
NESS TERMINAL NO.j
2.
Continuity should exist.
If OK, check harness for short.
OK
CHECK DUAL-PRESSURE SWITCH.
Refer to HA-97.
OK
cNG
Replace dual-pressure
switch.
jC
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
RHA655G
RHA656G
RHA657G
RHA658G
.
.
.
.
.
.
.
.
TROUBLE DIAGNOSESAUTO
Magnet Clutch (Cont'd)
HA-95

jB
Note
Check circuit continuity between A/C relay
harness terminal No.j
2and dual-pressure
switch harness terminal No.j
2.
Continuity should exist.
If OK, check harness for short.
Ye s
CHECK DUAL-PRESSURE SWITCH.
Refer to HA-97.
OK
cNG
Replace dual-pressure
switch.
jC
.
CHECK THERMO CONTROL AMP. CIR-
CUIT.
Do approx. 12 volts exist between thermo
control amp. harness terminal No.j
3and
body ground?
Ye s
cNo
jD
CHECK POWER SUPPLY FOR THERMO
AMP.
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 fuse (No.
,
located in the fuse block).
Note
Check circuit continuity between thermo
control amp. harness terminal No.j
2and
auto amp. harness terminal No.j
4.
Continuity should exist.
If OK, check harness for short.
OK
CHECK THERMO CONTROL AMP.
Refer to HA-47.
OK
cNG
Replace thermo amp.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
RHA659G
RHA660G
RHA661G
RHA662G
.
.
.
.
.
.
.
TROUBLE DIAGNOSESAUTO
Magnet Clutch (Cont'd)
HA-96

jD
Note
Check circuit continuity between dual-pres-
sure switch harness terminal No.j
1and
thermo control amp. harness terminal No.
j
3.
Continuity should exist.
If OK, check harness for short.
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
COMPONENT INSPECTION
A/C relay
Check continuity between terminal Nos.j3andj5,j6andj7.
Conditions Continuity
12V direct current supply between terminal Nos.
j
1andj2Ye s
No current supply No
If NG, replace relay.
Dual-pressure switch
ON
kPa (bar, kg/cm2, psi)OFF
kPa (bar, kg/cm2, psi)
Low-pressure
sideIncreasing to
157 - 216 (1.57 - 2.16,
1.6 - 2.2, 23 - 31)Decreasing to
157 - 196 (1.57 - 1.96,
1.6 - 2.0, 23 - 28)
High-pressure
sideDecreasing to
1,863 - 2,256 (18.6 - 22.6,
19 - 23, 270 - 327)Increasing to
2,452 - 2,844 (24.5 - 28.4,
25 - 29, 356 - 412)
RHA663G
SEC202B
RHA628G
.
TROUBLE DIAGNOSESAUTO
Magnet Clutch (Cont'd)
HA-97

Insufficient Cooling
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT COOLING
SYMPTOM:
+Insufficient cooling.
Inspection ¯ow
*1: HA-64
*2: HA-65
*3: HA-67
*4: HA-78*5: HA-82
*6: HA-89
*7: HA-94
*8: HA-79*9: HA-33
*10: HA-68
*11: HA-70
SHA053F
TROUBLE DIAGNOSESAUTO
HA-98

Insufficient Heating
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT HEATING
SYMPTOM:
+Insufficient heating.
Inspection ¯ow
*1: HA-70
*2: HA-64
*3: HA-65
*4: HA-67*5: HA-75
*6: HA-85
*7: HA-89*8: HA-94
*9: HA-79
*10: HA-68
SHA024F
TROUBLE DIAGNOSESAUTO
HA-99

Noise
TROUBLE DIAGNOSIS PROCEDURE FOR NOISE
SYMPTOM:
+Noise
Inspection ¯ow
*1: HA-123
*2: HA-125*3: HA-114 *4: HA-70
SHA896EA
TROUBLE DIAGNOSESAUTO
HA-100

Self-diagnosis
TROUBLE DIAGNOSIS PROCEDURE FOR SELF-DIAGNOSIS
SYMPTOM:
+Self-diagnosis cannot be performed.
Inspection ¯ow
*1: HA-74
*2: HA-103
*3: HA-105*4: HA-107
*5: HA-110
*6: HA-79*7: HA-70
*8: HA-69
SHA037F
TROUBLE DIAGNOSESAUTO
HA-101

Memory Function
TROUBLE DIAGNOSIS PROCEDURE FOR MEMORY FUNCTION
SYMPTOM:
+Memory function does not operate.
Inspection ¯ow
*1: HA-74 *2: HA-70 *3: HA-64
SHA027F
TROUBLE DIAGNOSESAUTO
HA-102