Nissan Silvia. Manual — part 280
10
CHECK POWER SUPPLY FOR THERMO CONTROL AMP.
Are there approx. 12 volts between thermo control amp. harness connector M49 terminal No. 3 (R) and body ground?
ZHA064H
Yes or No
Yes
©
GO TO 11.
No
©
Repair or replace thermo control amp.
11
CHECK THERMO CONTROL AMP. OPERATION
Does magnet clutch engage when there is a short-circuit between thermo control amp. harness connector M49 terminal
No. 2 and body ground?
ZHA065H
Yes or No
Yes
©
GO TO 12.
No
©
GO TO 13.
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Magnet Clutch (Cont’d)
HA-71
12
CHECK THERMO CONTROL AMP.
Refer to “Thermo Control Amp.”, HA-74.
OK or NG
OK
©
GO TO 13.
NG
©
Replace thermo control amp.
13
CHECK CIRCUIT CONTINUITY BETWEEN THERMO CONTROL AMP. AND A/C SWITCH
Disconnect A/C switch harness connector.
Check circuit continuity between thermo control amp. harness connector M49 terminal No. 2 (LG/B) and A/C switch har-
ness connector M34 terminal No. 3 (LG/B).
ZHA066H
If OK, check harness for short.
OK or NG
OK
©
GO TO 14.
NG
©
Repair harness or connector.
TROUBLE DIAGNOSES
Magnet Clutch (Cont’d)
HA-72
14
CHECK CIRCUIT CONTINUITY BETWEEN FAN SWITCH AND A/C SWITCH
Check circuit continuity between fan switch harness connector M33 terminal No. 5 (LG/R) and A/C switch harness connec-
tor M34 terminal No. 4 (LG/R).
ZHA067H
If OK, check harness for short.
OK or NG
OK
©
GO TO 15.
NG
©
Repair harness or connector.
15
CHECK BODY GROUND CIRCUIT FOR FAN SWITCH
Does continuity exist between fan switch harness terminal No. 6 (R/B) and body ground?
ZHA068H
Yes or No
Yes
©
GO TO 16.
No
©
Repair harness or connector.
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Magnet Clutch (Cont’d)
HA-73
16
CHECK FAN SWITCH
Refer to HA-37.
OK or NG
OK
©
Replace A/C control unit.
NG
©
Replace fan switch.
ZHA070H
ZHA092H
ELECTRICAL COMPONENTS INSPECTION
NMHA0279
Thermo Control Amp.
NMHA0279S01
1.
Run engine, and operate A/C system.
2.
Connect the voltmeter from harness side.
3.
Check thermo control amp. operation shown in the table.
Evaporator outlet air tempera-
ture
°C (°F)
Thermo amp. opera-
tion
Tester
Decreasing to 2.5 - 3.5 (37 -
38)
Turn OFF
Approx. 12V
Increasing to 4.0 - 5.0 (39 -
41)
Turn ON
Approx. 0V
ZHA071H
Thermal Protector
NMHA0279S02
Temperature of compressor
°C (°F)
Operation
Increasing to approx. 140 - 150 (284 - 302)
Turn OFF
Decreasing to approx. 125 - 135 (257 - 275)
Turn ON
If NG, replace thermal protector.
TROUBLE DIAGNOSES
Magnet Clutch (Cont’d)
HA-74
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