1999 NISSAN PICK-UP diagram

HHA186
TROUBLE DIAGNOSESMANUAL
Wiring Diagram Ð A/C, M Ð/KA Engine RHD
Models (Cont'd)
HA-2013

Magnet Clutch
DIAGNOSTIC PROCEDURE
Except for KA engine models
SYMPTOM: Magnet clutch does not engage when A/C
switch and fan switch are ON.
CHECK POWER SUPPLY FOR COM-
PRESSOR.
Disconnect compressor harness connec-
tor.
Do approx. 12 volts exist between com-
pressor harness terminal No.
V1and body
ground?
No
cYes
Check the following.
lMagnet clutch coillThermal protector (Except
for the Middle East)
NG
Replace magnet clutch.
Refer to HA-69 in D22
SERVICE MANUAL, Publi-
cation No. SM7E-0D22G1.
Note
Check circuit continuity between A/C relay
harness terminal No.
V5and compressor
harness terminal No.
V1.
Continuity should exist.
If OK, check harness for short.
OK
CHECK POWER SUPPLY FOR A/C
RELAY.
Do approx. 12 volts exist between A/C
relay harness terminal Nos.
V1,V3and
body ground?
Yes
cNo
Check power supply circuit
and 7.5A fuse (No.
23,
located in the fuse block).
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and Wiring Diagram.)
CHECK A/C RELAY AFTER DISCON-
NECTING IT.
Refer to HA-2021.
OK
cNG
Replace A/C relay.
TD25 and TD25Ti engines
Reconnect A/C relay.
cVA(Go to next page.)
Except for, TD25 and
TD25Ti engines
Note
Check circuit continuity between A/C relay
harness terminal No.
V2and triple-pres-
sure switch harness terminal No.
V4.
Continuity should exist.
If OK, check harness for short.
OK
VB(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
RHA325G
RHA748FD
RHA464H
RHA327GB
.
.
.
.
.
.
.
TROUBLE DIAGNOSESMANUAL
HA-2014

For KA engine models
SYMPTOM: Magnet clutch does not engage when A/C
switch and fan switch are ON.
CHECK POWER SUPPLY FOR COM-
PRESSOR.
Disconnect compressor harness connec-
tor.
Do approx. 12 volts exist between com-
pressor harness terminal No.
V1and body
ground?
No
cYes
Check the following.
lMagnet clutch coil
lThermal protector
Refer to HA-2021.
NG
Replace magnet clutch.
Refer to HA-69 in D22 Ser-
vice Manual, Publication
No. SM7E-0D22G1.
Note
Check circuit continuity between A/C relay
harness terminal No.
V5and compressor
harness terminal No.
V1.
Continuity should exist.
If OK, check harness for short.
OK
CHECK POWER SUPPLY FOR A/C
RELAY.
Do approx. 12 volts exist between A/C
relay harness terminal No.
V3and body
ground?
Yes
cNo
Check power supply circuit
and 7.5A fuse (No.
23,
located in the fuse block).
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and Wiring Diagram.)
CHECK POWER SUPPLY FOR A/C
RELAY.
Do approx. 12 volts exist between A/C
relay harness terminal No.
V1and body
ground?
Yes
cNo
Check power supply circuit
and 7.5A fuse (No.
23,
located in the fuse block).
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and Wiring Diagram.)
CHECK A/C RELAY AFTER DISCON-
NECTING IT.
Refer to HA-2021.
OK
cNG
Replace A/C relay.
Reconnect A/C relay.
VA
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
RHA333G
RHA334G
RHA359G
RHA375G
.
.
.
.
.
.
.
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont'd)
HA-2017

VA
NoteNote
CHECK COIL SIDE CIRCUIT OF A/C
RELAY.
Do approx. 12 volts exist between ECM
harness terminal No.
V11orV23and body
ground?
Yes
cNo
Check circuit continuity
between A/C relay har-
ness terminal No.
V2and
ECM harness terminal No.
V11orV23.
Continuity should exist.
If OK, check harness for
short.
Note
CHECK VOLTAGE FOR THERMO CON-
TROL AMP.
Do approx. 12 volts exist between thermo
control amp. harness terminal No.
V3and
body ground?
Yes
cNo
VC(Go to HA-2020.)
CHECK POWER SUPPLY FOR
THERMO CONTROL AMP.
Do approx. 12 volts exist between thermo
control amp. harness terminal No.
V1and
body ground?
Yes
cNo
Check power supply circuit
and 7.5A fuse (No.
23,
located in the fuse block.)
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and Wiring Diagram.)
Note
Check circuit continuity between thermo
control amp. harness terminal No.
V2and
body ground.
Continuity should exist.
If OK, check harness for short.
NG
cOK
Replace thermo control
amp.
Note
Chek circuit continuity between thermo
control amp. harness terminal No.
V2and
A/C switch harness terminal No.
V13.
Continuity should exist.
If OK, check harness for short.
OK
VB(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity,
repair harness or connector.
RHA335GA
RHA336GA
RHA338GA
RHA319GB
SHA102FA
.
.
.
.
.
.
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont'd)
HA-2018

Overview of Control System
The control system consists of input sensors, switches, the auto-
matic amplifier (microcomputer) and outputs. The relationship of
these components is shown in the diagram below:
Control Operation
RHA467H
RHA468H
DESCRIPTIONAUTO
HA-2024

Circuit Diagram
HHA187
TROUBLE DIAGNOSESAUTO
HA-2027

Wiring Diagram Ð A/C, A Ð
HHA188
TROUBLE DIAGNOSESAUTO
HA-2028

HHA189
TROUBLE DIAGNOSESAUTO
Wiring Diagram Ð A/C, A Ð (Cont'd)
HA-2029