Nissan Terrano model r20 series 2004. Instruction — part 364
q
A
q
B
I
Turn ignition switch OFF.
Disconnect A/C relay harness connec-
tor.
CHECK POWER SUPPLY
FOR A/C RELAY.
Disconnect A/C relay.
Do approx. 12 volts exist
between A/C relay harness
connector terminal No.
q
3
and body ground?
NG
OK
Note
Check circuit continuity between A/C
relay harness connector terminal No.
q
5
and compressor harness connector
terminal No.
q
1
.
If NG, check harness connectors.
H
CHECK POWER SUPPLY
CIRCUIT AND 10A FUSE AT
FUSE BLOCK.
(Refer to “POWER SUPPLY
ROUTING” in EL section and
Wiring Diagram.)
I
Turn ignition switch ON.
CHECK POWER SUPPLY FOR A/C
RELAY (Coil side).
Do approx. 12 volts exist between A/C
relay harness connector terminal No.
q
2
and body ground?
H
E
NG
CHECK POWER SUPPLY
FOR A/C CONTROL PANEL.
Disconnect A/C control panel
harness connector.
Do approx. 12 volts exist
between A/C control panel
harness connector terminal
No.
q
1
and body ground?
NG
OK
F
q
C
(Go to next page.)
CHECK POWER SUPPLY
CIRCUIT AND 10A FUSE AT
FUSE BLOCK.
(Refer to “POWER SUPPLY
ROUTING” in EL section and
Wiring Diagram.)
Note:
If the result is NG after checking circuit continuity, repair harness or connec-
tor.
YHA417
YHA418
YHA419
YHA420
H
H
H
H
H
H
TROUBLE DIAGNOSES
Diagnostic Procedure 2 (Cont’d)
HA-56
q
C
CHECK A/C RELAY AFTER DISCON-
NECTING IT.
(Refer to Electrical Components
Inspection, HA-62.)
OK
E
NG
Replace A/C relay.
Reconnect A/C relay.
Note
CHECK COIL SIDE CIRCUIT OF A/C
RELAY.
Do approx. 12 volts exist between
ECM harness connector terminal No.
204
(TD27Ti models) or
q
15
(ZD30DDTi
models) and body ground?
OK
E
NG
I
Turn ignition switch OFF.
Check circuit continuity
between A/C relay harness
terminal No.
q
1
and ECM
harness connector terminal
No.
204
(TD27Ti models)
or
q
15
(ZD30DDTi models).
CHECK VOLTAGE FOR THERMO
CONTROL AMP.
Do more than 8 volts exist between
thermo-control amp. harness connector
terminal No.
q
2
and body ground?
OK
E
NG
I
Turn ignition switch OFF.
Check circuit continuity
between thermo-control
amp. harness connector
terminal No.
q
2
and dual-
pressure switch connector
terminal No.
q
2
.
OK
q
D
(Go to next page.)
CHECK DUAL-PRES-
SURE SWITCH.
(Refer to Electrical Compo-
nents Inspection, HA-62.)
NG
OK
q
E
(Go to page HA-59.)
Replace dual-pressure
switch.
Note:
If the result is NG after checking circuit continuity, repair harness or connec-
tor.
YHA421
YHA422
YHA423
YHA424
H
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
Diagnostic Procedure 2 (Cont’d)
HA-57
q
D
CHECK POWER SUPPLY FOR
THERMO-CONTROL AMP.
Disconnect thermo-control amp. connec-
tor.
Do approx. 12 volts exist between thermo-
control amp. harness connector terminal
No.
q
1
and body ground?
OK
E
NG
CHECK POWER SUPPLY
CIRCUIT AND 10A FUSE
AT FUSE BLOCK.
(Refer to “POWER SUP-
PLY ROUTING” in EL sec-
tion and Wiring Diagram.)
I
Turn ignition switch OFF.
CHECK BODY GROUND CIRCUIT FOR
THERMO-CONTROL AMP.
Disconnect thermo-control amp. harness
connector.
Ensure A/C switch is in ON position.
Ensure fan switch is in ON position
(1 to 4).
Does continuity exist between thermo
control amp. harness connector terminal
No.
q
3
and body ground?
OK
E
NG
Disconnect fan switch har-
ness connector.
Ensure A/C switch is in ON
position.
OK
Note
Check circuit continuity
between thermo-control
amp. harness connector
terminal No.
q
3
and fan
switch harness connector
terminal No.
q
6
.
NG
Replace thermo-control amp.
Check A/C switch (Refer to
Electrical Components
Inspection, HA-61.)
OK
H
Repair harness or connec-
tors.
Note
CHECK BODY GROUND CIRCUIT FOR
FAN SWITCH.
Does continuity exist between fan switch
harness connector terminal
No.
q
1
and body ground?
OK
CHECK FAN SWITCH.
(Refer to Electrical Components
Inspection, HA-61.)
NG
Replace fan switch.
Note:
If the result is NG after checking circuit continuity, repair harness or connec-
tor.
YHA406
YHA425
YHA426
YHA427
H
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
Diagnostic Procedure 2 (Cont’d)
HA-58
q
E
Note
Check circuit continuity between ECM
harness connector terminal No.
q
21
(ZD30DDTi) or
403
(TD27Ti) and dual-
pressure switch harness connector termi-
nal No.
q
1
.
OK
CHECK ECM.
(Refer to EF & EC section.)
Note:
If the result is NG after checking circuit continuity, repair harness or connec-
tor.
YHA428
H
H
TROUBLE DIAGNOSES
Diagnostic Procedure 2 (Cont’d)
HA-59
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