NISSAN ALMERA 2001 Service Manual

16 CHECK BODY GROUND CIRCUIT
Check circuit continuity between heater control panel harness terminal No. 9 or 13 and body ground.
RHA771H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©INSPECTION END
NG©Repair harness or connector.
MAGNET CLUTCH CIRCUIT (FOR YD ENGINE)NJHA0203SYMPTOM:
+Magnet clutch does not engage when A/C switch and fan
switch are ON.
1 CHECK POWER SUPPLY FOR COMPRESSOR
Disconnect compressor harness connector.
Do approx. 12 volts exist between compressor harness terminal No. 1 and body ground?
RHA794H
YesorNo
Ye s©GO TO 2.
No©Disconnect A/C relay. GO TO 3.
2 CHECK MAGNET CLUTCH COIL
OK or NG
NG©Replace magnet clutch. Refer to HA-85.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-61

3 CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND COMPRESSOR HARNESS
Check circuit continuity between A/C relay harness terminal No. 3 and compressor harness terminal No. 1.
RHA634H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 4.
NG©Repair harness or connector.
4 CHECK POWER SUPPLY FOR A/C RELAY
Disconnect A/C relay.
Do approx. 12 volts exist between A/C relay harness terminal Nos. 1, 5 and body ground?
RHA635H
YesorNo
Ye s©GO TO 5.
No©Check power supply circuit and 10A (No. 15) fuse at fuse block. Refer to Sedan: EL-11,
Hatchback: EL-28, ªWiring Diagram Ð POWER к.
5 CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to HA-66.
OK or NG
OK©Reconnect A/C relay. GO TO 6.
NG©Replace A/C relay.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-62

6 CHECK COIL SIDE CIRCUIT OF A/C RELAY
Do approx. 12 volts exist between ECM harness terminal No. 15 or 204 and body ground?
RHA772H
YesorNo
Ye s©GO TO 8.
No©Disconnect A/C relay. Disconnect ECM harness connector. GO TO 7.
7 CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND ECM HARNESS
Check circuit continuity between A/C relay harness terminal No. 2 and ECM harness terminal No. 15 or 204.
RHA773H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©Check ECM. Refer to EC-164 (QG), EC-659 (YD), ªECM Terminals and Reference
Valueº.
NG©Repair harness or connector.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-63

8 CHECK VOLTAGE FOR ECM
Do approx. 12 volts exist between ECM harness terminal No. 21 or 403 and body ground?
RHA774H
YesorNo
Ye s©GO TO 9.
No©Check ECM. Refer to EC-164 (QG), EC-659 (YD), ªECM Terminals and Reference
Valueº.
9 CHECK POWER SUPPLY FOR DUAL-PRESSURE SWITCH
Do approx. 12 volts exist between dual-pressure switch harness terminal No. 2 and body ground?
RHA775H
YesorNo
Ye s©GO TO 10.
No©Repair harness or connector.
10 CHECK DUAL-PRESSURE SWITCH
Refer to HA-67.
OK or NG
OK©GO TO 11.
No©Replace dual-pressure switch.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-64

11 CHECK CIRCUIT CONTINUITY BETWEEN DUAL-PRESSURE SWITCH AND HEATER CONTROL PANEL
(A/C SWITCH)
Check circuit continuity between dual-pressure switch harness terminal No. 1 and heater control panel harness terminal
No. 7.
NHA490
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 12.
NG©Repair harness or connector.
12 CHECK A/C SWITCH
Refer to HA-67.
OK or NG
OK©GO TO 13.
NG©Replace A/C switch.
13 CHECK HEATER CONTROL PANEL CIRCUIT
Check circuit continuity between heater control panel harness terminal No. 8 and No. 18.
NHA491
Continuity should exist.
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-65

14 CHECK FAN SWITCH
Refer to HA-54.
OK or NG
OK©GO TO 15.
NG©Replace fan switch.
15 CHECK BODY GROUND CIRCUIT
Check circuit continuity between heater control panel harness terminal No. 13 and body ground.
RHA778H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©INSPECTION END.
NG©Repair harness or connector.
RHA638H
ELECTRICAL COMPONENT INSPECTIONNJHA0192A/C RelayNJHA0192S01Check continuity between terminal Nos. 3 and 5.
Conditions Continuity
12V direct current supply between terminal Nos. 1 and 2 Yes
No current supply No
If NG, replace relay.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-66

RHA639H
SHA315FD
Refrigerant Pressure SensorNJHA0192S02Make sure that the A/C refrigerant pressure and the sensor output
voltage are within the specified range as shown in the A/C operat-
ing condition figure.
Check voltage between ECM harness terminal No. 74 and body
ground.
RHA715H
Dual-pressure SwitchNJHA0192S03
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)
NHA492
A/C SwitchNJHA0192S04Check continuity between terminals.
A/C switch Terminals Continuity
For EuropeON1-7
Ye s
1-8
OFF1-7
No
1-8
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-67

Insufficient Cooling
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT COOLING=NJHA0148SYMPTOM:
+Insufficient Cooling.
INSPECTION FLOW
NHA390
*1: HA-42
*2: HA-72
*3: HA-69*4: HA-34
*5: HA-33
*6: HA-83*7: EM-16 (QG),
EM-85 (YD)
*8: EC-406 (QG) Europe,
EC-730 (YD) Europe
TROUBLE DIAGNOSES
Insufficient Cooling
HA-68

PERFORMANCE TEST DIAGNOSESNJHA0149
SHA419F
*1: HA-71
*2: HA-71*3: HA-72 *4: HA-43
TROUBLE DIAGNOSES
Insufficient Cooling (Cont'd)
HA-69

SHA361FA
*1: HA-86 *2: HA-48 *3: EM-16 (QG),
EM-85 (YD)
TROUBLE DIAGNOSES
Insufficient Cooling (Cont'd)
HA-70