NISSAN ALMERA 2001 Service Manual

6 CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND RESISTOR
Check circuit continuity between blower motor harness terminal No. 2 and fan resistor harness terminal No. 1.
RHA700HA
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©Poor contact between the resistor and blower motor connector.
NG©Repair harness or connector.
7 CHECK GROUND CIRCUIT FOR HEATER CONTROL PANEL
Check circuit continuity between fan switch harness terminal No. 9 or 13 and body ground.
RHA849H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 8.
NG©Repair harness or connector.
8 CHECK RESISTOR AFTER DISCONNECTING IT
(Refer to Electrical Components Inspection.)
(HA-54)
OK or NG
OK©GO TO 9.
NG©Replace resistor.
9 CHECK RESISTOR HARNESS CONNECTOR
Reconnect resistor harness connector.
OK or NG
1©GO TO 12.
2, 3, 4©GO TO 10.
TROUBLE DIAGNOSES
Blower Motor (Cont'd)
HA-51

10 CHECK FAN SWITCH CIRCUIT
Do approx. 12 volts exist between each fan switch harness terminal and body ground?
RHA850H
YesorNo
Ye s©GO TO 13.
No©GO TO 11.
11 CHECK CIRCUIT CONTINUITY BETWEEN HEATER CONTROL PANEL AND RESISTOR
Check circuit continuity between heater control panel harness terminals and fan resistor harness terminals.
RHA851H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 12.
NG©Repair harness or connector.
TROUBLE DIAGNOSES
Blower Motor (Cont'd)
HA-52

12 CHECK CIRCUIT CONTINUITY BETWEEN HEATER CONTROL PANEL AND BLOWER MOTOR
Check circuit continuity between heater control panel harness terminal No. 13 or 17 and blower motor harness terminal
No. 2.
RHA852H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 13.
NG©Repair harness or connector.
13 CHECK FAN SWITCH AFTER DISCONNECTING IT
(Refer to Electrical Components Inspection.)
(HA-54)
OK or NG
OK©INSPECTION END
NG©Replace fan switch.
TROUBLE DIAGNOSES
Blower Motor (Cont'd)
HA-53

NHA386
ELECTRICAL COMPONENTS INSPECTION=NJHA0146Fan SwitchNJHA0146S01Check continuity between terminals at each switch position.
KNOB POSITION Continuity between terminals
OFF No continuity
1 13Ð14Ð18
2 13Ð15Ð18
3 13Ð16Ð18
4 13Ð17Ð18
Blower MotorNJHA0146S02Confirm smooth rotation of the blower motor.
+Ensure that there are no foreign particles inside the intake unit.
RHA706H
Blower ResistorNJHA0146S03Check resistance between terminals.
Terminal No. Resistance
(+) (þ)LHD models for
EuropeExcept LHD mod-
els for Europe
4
1Approx. 2.4 - 2.8W
3Approx. 0.58 -
0.7WApprox. 1.2 - 1.4W
2Approx. 0.22 -
0.26WApprox. 0.43 -
0.51W
TROUBLE DIAGNOSES
Blower Motor (Cont'd)
HA-54

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-93
*2: HA-56*3: HA-34
*4: HA-33*5: EM-16 (QG),
EM-85 (YD)
TROUBLE DIAGNOSES
Magnet Clutch
HA-55

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-85.
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-56

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.
6 CHECK COIL SIDE CIRCUIT OF A/C RELAY
Do approx. 12 volts exist between ECM harness terminal No. 16 or 23 and body ground?
RHA764H
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-57

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. 16 or 23.
RHA765H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©Check ECM. Refer to EC-164 (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. 68 or 51 and body ground?
RHA766H
YesorNo
Ye s©GO TO 9.
No©Check ECM. Refer to EC-164 (QG), EC-659 (YD), ªECM Terminals and Reference
Valueº.
9 CHECK REFRIGERANT PRESSURE SENSOR
Refer to HA-67.
OK or NG
OK©GO TO 10.
NG©Replace refrigerant pressure sensor.
10 CHECK A/C SWITCH
Refer to HA-67.
OK or NG
OK©GO TO 11.
NG©Replace heater control panel.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-58

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?
NHA487
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.
NHA488
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-59

13 CHECK HEATER CONTROL PANEL CIRCUIT
Check circuit continuity between heater control panel harness terminal No. 8 and 18.
NHA489
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.
RHA770H
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-54.
YesorNo
Ye s©GO TO 16.
No©Replace heater control panel.
TROUBLE DIAGNOSES
Magnet Clutch (Cont'd)
HA-60