2001 NISSAN ALMERA N16 Clutch

How to Perform Trouble Diagnoses for Quick
and Accurate Repair
NJHA0129WORK FLOWNJHA0129S01
SHA900E
*1: HA-40
SYMPTOM TABLENJHA0129S02
Symptom Reference page
+Intake door does not change.+Go to Trouble Diagnosis Procedure for Intake Door. HA-42
+Air outlet does not change.+Go to Trouble Diagnosis Procedure for mode door. HA-46
+Air mix door does not change.+Go to Trouble Diagnosis Procedure for Air mix door. HA-48
+Max hot door does not change.+Go to Trouble Diagnosis Procedure for Max Hot Door. HA-50
+Blower motor does not rotate at all.+Go to Trouble Diagnosis Procedure for Blower Motor. HA-54
+Magnet clutch does not engage when A/C switch and
fan switch are ON.+Go to Trouble Diagnosis Procedure for Magnet Clutch. HA-61
+Insufficient cooling.+Go to Trouble Diagnosis Procedure for Insufficient cool-
ing.HA-74
+Insufficient heating.+Go to Trouble Diagnosis Procedure for Insufficient
heating.HA-82
+Noise+Go to Trouble Diagnosis Procedure for Noise. HA-83
TROUBLE DIAGNOSES
How to Perform Trouble Diagnoses for Quick and Accurate Repair
HA-39

NHA377
3. Check RecirculationNJHA0130S02031. Press the Recirculation (REC) switch. Recirculation indicator
should illuminate.
2. Listen for intake door position change.
If NG, go to trouble diagnosis procedure for intake door (HA-42).
If OK, continue with next check.
NHA378
4. Check Temperature DecreaseNJHA0130S02041. Turn the temperature control knob to full cold.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient cooling
(HA-74).
If OK, continue with next check.
NHA379
5. Check Temperature IncreaseNJHA0130S02051. Turn the temperature control knob to full hot.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heating
(HA-82).
NHA380
6. Check Air Conditioner SwitchNJHA0130S0206Turn the fan control switch to the desired (1 to 4 speed) position
and push the A/C switch to turn ON the air conditioner.
The indicator lamp should come on when air conditioner is ON.
If NG, go to trouble diagnosis procedure for magnet clutch (HA-61).
TROUBLE DIAGNOSES
Operational Check (Cont'd)
HA-41

Magnet Clutch
TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH=NJHA0155SYMPTOM:
+Magnet clutch does not operate when A/C switch and fan switch are ON.
INSPECTION FLOW
NHA387
*1: HA-99
*2: HA-62*3: HA-40
*4: HA-39*5: EM-15 (QG),
EM-84 (YD)
TROUBLE DIAGNOSES
Magnet Clutch
HA-61

MAGNET CLUTCH CIRCUIT (FOR QG ENGINE)=NJHA0156SYMPTOM:
+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-91.
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.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-62

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-23,
Hatchback: EL-12, ªWiring Diagram Ð POWER к.
5 CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to HA-72.
OK or NG
OK©Reconnect A/C relay. GO TO 6.
NG©Replace A/C relay.
6 CHECK COIL SIDE CIRCUIT OF A/C RELAY
Do approx. 12 volts exist between ECM harness terminal No. 23 and body ground?
NHA510
YesorNo
Ye s©GO TO 8.
No©Disconnect A/C relay. Disconnect ECM harness connector. GO TO 7.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-63

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. 23.
NHA511
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©Check ECM. Refer to EC-132 (QG), ªECM Terminals and Reference Valueº.
NG©Repair harness or connector.
8 CHECK VOLTAGE FOR ECM
Do approx. 12 volts exist between ECM harness terminal No. 51 and body ground?
NHA512
YesorNo
Ye s©GO TO 9.
No©Check ECM. Refer to EC-132 (QG), EC-554 (YD), ªECM Terminals and Reference
Valueº.
9 CHECK REFRIGERANT PRESSURE SENSOR
Refer to HA-73.
OK or NG
OK©GO TO 10.
NG©Replace refrigerant pressure sensor.
10 CHECK A/C SWITCH
Refer to HA-73.
OK or NG
OK©GO TO 11.
NG©Replace heater control panel.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-64

11 CHECK POWER SUPPLY FOR HEATER CONTROL PANEL (A/C SWITCH)
Do approx. 12 volts exist between heater control panel harness terminal No. 7 and body ground?
NHA513
YesorNo
Ye s©GO TO 13.
No©GO TO 12.
12 CHECK CIRCUIT CONTINUITY BETWEEN HEATER CONTROL PANEL AND ECM
Check circuit continuity between heater control panel harness terminal No. 7 and ECM harness terminal No. 44.
NHA514
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©Check ECM. Refer to EC-132 (QG), EC-554 (YD), ªECM Terminals and Reference
Valueº.
NG©Repair harness or connector.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-65

13 CHECK HEATER CONTROL PANEL CIRCUIT
Check circuit continuity between heater control panel harness terminal No. 8 and 18.
NHA515
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 14.
NG©Repair harness or connector.
14 CHECK CIRCUIT CONTINUITY BETWEEN ECM AND HEATER CONTROL PANEL
Check circuit continuity between ECM harness terminal No. 68 or 51 and heater control panel harness terminal No. 14 or
18.
NHA516
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 15.
NG©Repair harness or connector.
15 CHECK FAN SWITCH
Refer to HA-60.
YesorNo
Ye s©GO TO 16.
No©Replace heater control panel.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-66