Nissan Terrano r20e. Instruction — part 353
q
C
CHECK A/C RELAY AFTER DISCON-
NECTING IT.
(Refer to Electrical Components
Inspection.)
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.)
NG
OK
q
E
(Go to page HA-58.)
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-56
q
D
CHECK POWER SUPPLY FOR
THERMO-CONTROL AMP.
Go to Main Power Supply and Ground
Circuit Check.
OK
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.
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-60)
OK
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 Inspec-
tion.)
NG
Replace fan switch.
Note:
If the result is NG after checking circuit continuity, repair harness or connec-
tor.
YHA425
YHA426
YHA427
H
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
Diagnostic Procedure 2 (Cont’d)
HA-57
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-58
Diagnostic Procedure 3
SYMPTOM: Intake door does not change.
CHECK OPERATION
Does intake door motor (recirculation sys-
tem) operate, correctly?
NG
E
OK
Intake door motor (recir-
culation system) is OK.
CHECK POWER SUPPLY A/C CONTROL
PANEL
Disconnect A/C control panel harness con-
nector.
Do approx. 12 volts exist between A/C panel
harness connector terminal
q
1
and body
ground?
OK
E
NG
CHECK POWER SUP-
PLY CIRCUIT AND 10A
FUSE.
(Refer to “POWER
SUPPLY ROUTING” in
EL section and Wiring
Diagram).
CHECK POWER SUPPLY FOR INTAKE
DOOR MOTOR
I
Turn ignition switch ON.
Check voltage between intake door motor
terminal
q
1
and ground, a few seconds after
air recirculation switch is switched ON.
Do approx. 12 volts exist?
Check voltage between intake door motor
terminal
q
2
and ground, a few seconds after
air recirculation switch is switched OFF.
Do approx. 12 volts exist?
OK
E
NG
Check continuity
between intake door
motor terminal
q
1
(
q
2
)
and A/C control panel
terminal
q
10
(
q
11
).
If NG, repair harness or
connector.
OK
Replace A/C control
panel.
CHECK INTAKE DOOR MOTOR
Apply approx. 12 volts between intake door
motor terminals
q
1
(
q
2
) and
q
2
(
q
1
).
Does intake door motor operate, correctly?
OK
E
NG
Replace intake door
motor.
CHECK INTAKE DOOR LINKAGE
(Refer to “Control Linkage Adjustment.)
If OK, intake door is OK.
E
NG
Repair intake door link-
age.
YHA429
YHA430
YHA431
YHA432
H
H
H
H
H
TROUBLE DIAGNOSES
HA-59
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