NISSAN LATIO 2011 Service Repair Manual

TROUBLE DIAGNOSISMTC-35
< SERVICE INFORMATION >
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NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-31, "
Operational Check".
Can a symptom be duplicated?
YES >> Refer to MTC-23, "How to Perform Trouble Diagnosis for Quick and Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK FRONT BLOWER MOTOR CIRCUIT
Check front blower motor circuit. Refer to "D IAGNOSTIC PROCEDURE FOR FRONT BLOWER MOTOR" .
OK or NG
OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-31, "Operational
Check". If other symptoms exist, refer to MTC-23, "How to Perform Trouble Diagnosis for Quick
and Accurate Repair".
NG >> Repair as necessary.
DIAGNOSTIC PROCEDURE FOR FRONT BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning.
1.CHECK FRONT BLOWER MOTOR OPERATION
1. Turn ignition switch ON.
2. Check front blower motor operation at each fan speed.
OK or NG
OK >> Inspection End.
NG >> • Front blower motor does not operate at any speed, GO TO 2. • Front blower motor does not operate at one or more of the four speeds, GO TO 10.
2.CHECK POWER SUPPLY FOR FRONT BLOWER MOTOR
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.
3. Turn ignition switch ON.
4. Check voltage between front blower motor harness connector M62 terminal 1 and ground.
OK or NG
OK >> GO TO 6.
WJIA2259E
Te r m i n a l s Vol tag e
(Approx.)
(+)
(− )
Connector Terminal Ground
Front blower
motor: M62 1
Battery voltage
WJIA2228E
Revision: May 2010 2011 Versa

MTC-36
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
NG >> Check power supply circuit and 15A fuses [Nos. 15 and 17, located in the fuse block (J/B)].Refer to PG-4, "
Schematic".
• If fuses are OK, reinstall fuses and GO TO 3.
• If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
3.CHECK BLOWER MOTOR RELAY POWER SUPPLY CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect blower motor relay connector.
3. Turn ignition switch ON.
4. Check voltage between blower motor relay harness connector J- 1 terminal 1, 5 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4.CHECK BLOWER MOTOR RELAY (S WITCH SIDE) CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Check continuity between blower motor relay harness connector J-1 (A) terminal 3 and front blower motor harness connector
M62 (B) terminal 1.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
5.CHECK BLOWER MOTOR RELAY GROUND CIRCUIT
Check continuity between blower motor relay harness connector J-1
terminal 2 and ground.
OK or NG
OK >> Replace blower motor relay.
NG >> Repair harness or connector.
6.CHECK FRONT BLOWER MOTOR
Check continuity between front blower motor terminals 1 and 2.
NOTE:
Ensure that there are no foreign particles inside the A/C unit assem-
bly for a smooth rotation of the front blower motor.
OK or NG
OK >> GO TO 7.
NG >> Replace front blower motor. Refer to MTC-63, "
Removal
and Installation".
7.CHECK CIRCUIT CONTINUITY BETWEEN FRONT BLOWER MOTOR AND FRONT AIR CONTROL
1 - Ground Battery voltage should exist.
5 - Ground Battery voltage should exist.
WJIA1783E
Continuity should exist.
WJIA2263E
Continuity should exist.
WJIA2264E
1 - 2
: Continuity should exist.
WJIA2230E
Revision: May 2010 2011 Versa

TROUBLE DIAGNOSISMTC-37
< SERVICE INFORMATION >
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1. Disconnect front air control connector.
2. Check continuity between front blower motor harness connector M62 (A) terminal 2 and front air control harness connector M33
(B) terminal 13.
OK or NG
OK >> GO TO 8.
NG >> Repair harness or connector.
8.CHECK FAN SWITCH
Check continuity between front ai r control terminal 9 and 10, 11, 12,
13, 14.
OK or NG
OK >> GO TO 9.
NG >> Replace front air control. Refer to MTC-59, "
Removal and Installation".
9.CHECK FAN SWITCH GROUND CIRCUIT
Check continuity between front air control harness connector M33
terminal 9 and ground.
OK or NG
OK >> Inspection End.
NG >> Repair harness or connector.
10.CHECK CIRCUIT CONTINUITY BETWEEN FRONT AIR CONTROL AND FRONT BLOWER MOTOR
RESISTOR
1. Turn ignition switch OFF.
2. Disconnect front blower motor resistor and front air control con- nectors.
3. Check continuity between front air control harness connector
M33 (A) terminals and front blower motor resistor harness con-
nector M6 (B) terminals.
OK or NG
2 - 13 : Continuity should exist.
AWIIA0339ZZ
Terminals ConditionContinuity
9 14 Blower control dial: OFF
Ye s
10 Blower control dial: 1-speed
11 Blower control dial: 2-speed
12 Blower control dial: 3-speed
13 Blower control dial: 4-speed
SJIA0732E
Continuity should exist.
SJIA0734E
AB Continuity
Connector Terminal Connector Terminal
Front air control: M33 10
Front blower
motor resistor: M6 1
Ye s
11
2
12 3
13 4
SJIA0733E
Revision: May 2010 2011 Versa

MTC-38
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
OK >> GO TO 11.
NG >> Repair harness or connector.
11 .CHECK FAN SWITCH
Check continuity between front air control terminal 9 and 10, 11, 12,
13, 14.
OK or NG
OK >> Replace the front blower motor resistor. Refer to MTC-67, "Removal and Installation".
NG >> Replace front air control. Refer to MTC-59, "
Removal and Installation".
Magnet Clutch Circuit (If Equipped)INFOID:0000000005930853
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OP ERATIONAL CHECK - MAGNET CLUTCH
1. Turn ignition switch ON.
2. Turn blower control dial to the desired (1 to 4 speed) position.
3. Press the A/C switch. A/C indicator will turn on.
4. Confirm that the compressor clut ch engages (sound or visual inspection).
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to MTC-31, "
Operational Check".
Does another symptom exist?
YES >> Refer to MTC-23, "How to Perform Trouble Diagnosis for Quick and Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK COMPRESSOR BELT TENSION
Check compressor belt tension. Refer to EM-13, "
Checking" (HR16DE) or EM-132, "Checking Drive Belts"
(MR18DE).
OK or NG
OK >> GO TO 5.
NG >> Adjust or replace A/C compressor belt. Refer to EM-14, "
Removal and Installation" (HR16DE) or
EM-132, "
Removal and Installation" (MR18DE).
5.CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to MTC-46, "
Insufficient Cooling".
OK or NG
OK >> GO TO 6.
NG >> Perform trouble diagnosis for unusual pressure. Refer to MTC-46, "
Insufficient Cooling".
TerminalsConditionContinuity
9 14 Fan control dial: OFF
Ye s
10 Fan control dial: 1-speed
11 Fan control dial: 2-speed
12 Fan control dial: 3-speed
13 Fan control dial: 4-speed
SJIA0732E
Revision: May 2010 2011 Versa

TROUBLE DIAGNOSISMTC-39
< SERVICE INFORMATION >
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6.CHECK MAGNET CLUTCH CIRCUIT
Perform diagnostic procedure for the magnetic clutch . Refer to "DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH".
OK or NG
OK >> If the symptom still exists, perform a complete operational check. Refer to MTC-31, "Operational
Check". If other symptoms exist, refer to MTC-23, "How to Perform Trouble Diagnosis for Quick
and Accurate Repair".
NG >> Repair as necessary.
SYSTEM DESCRIPTION
Thermo control amp. controls A/C compressor operation by intake air temperature and signal from ECM.
The defrost A/C switch controls A/C compressor operati on by the BCM when the mode switch is turned to the
(DEF) position.
Low Temperature Protection Control
When intake air temperatures are higher than 4 °C (39° F), the com-
pressor turns ON. The compressor turns OFF when intake air tem-
peratures are lower than 2 °C (36° F).
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage in A/C, defrost/foot, or defrost mode.
1.PERFORM AUTO ACTIVE TEST
Refer to PG-20, "
Auto Active Test".
Does the magnet clutch operate?
YES >> GO TO 5.
NO >> Check 10A fuse (No. 42, located in the IPDM E/R). Refer to PG-24, "
IPDM E/R Terminal
Arrangement - Type B".
• If fuse is OK, GO TO 2.
• If fuse is NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
2.CHECK POWER SUPPLY FOR IPDM E/R
Check power supply to 10A fuse (No. 42 located in the IPDM E/R).
SJIA0741E
WJIA2250E
Revision: May 2010 2011 Versa

MTC-40
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
OK or NG
OK >> GO TO 3.
NG >> Check harness for open circuit. Repair or replace if necessary.
3.CHECK POWER SUPPLY FOR A/C COMPRESSOR
1. Disconnect A/C compressor connector.
2. Start the engine.
3. Turn blower control dial and A/C switch ON.
4. Check voltage between A/C compressor harness connector F3 terminal 1 and ground.
OK or NG
OK >> Replace magnet clutch. Refer to MTC-78, "Removal and
Installation of Compressor - HR16DE" or MTC-80,
"Removal and Installation of Compressor - MR18DE".
NG >> GO TO 4.
4.CHECK CIRCUIT CONTINUITY BETW EEN IPDM E/R AND COMPRESSOR
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between A/ C compressor harness connector
F3 (A) terminal 1 and IPDM E/R harness connector E43 (B) ter-
minal 11.
OK or NG
OK >> Replace IPDM E/R. Refer to PG-28, "Removal and
Installation of IPDM E/R".
NG >> Repair harness or connector.
5.CHECK DEFROST A/C SWITCH
1. Start the engine.
2. Turn the mode control dial to (DEF) position.
Does the magnet clutch operate
OK >> GO TO 6.
NG >> GO TO 23.
6.CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
1. Turn ignition switch OFF.
2. Check compressor ON/OFF signal. Refer to MTC-22, "
CONSULT-III Function (BCM)".
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.CHECK CIRCUIT CONTINUITY BETWEE N FRONT AIR CONTROL AND BCM
:Battery voltage should exist
1 - Ground :Battery voltage
SJIA0743E
1 - 11 :Continuity should exist
WJIA2233E
A/C SW ON : AIR COND SW ON
A/C SW OFF : AIR COND SW OFF
Revision: May 2010 2011 Versa

TROUBLE DIAGNOSISMTC-41
< SERVICE INFORMATION >
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1. Turn ignition switch OFF.
2. Disconnect front air control and BCM connector.
3. Check continuity between front air control harness connector
M33 (A) terminal 1and BCM harness connector M18 (B) termi-
nal 27.
OK or NG
OK >> GO TO 8.
NG >> Repair harness or connector.
8.CHECK REFRIGERANT PRESSURE SENSOR
1. Reconnect front air control connector and BCM connector.
2. Check refrigerant pressure sensor. Refer to EC-1030, "
Diagnosis Procedure" (MR18DE) or EC-461,
"Diagnosis Procedure" (HR16DE).
.OK or NG
OK >> • WITH CONSULT-III GO TO 9.
• WITHOUT CONSULT-III GO TO 10.
NG >> Replace as necessary.
9.CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to MTC-22, "
CONSULT-III Function (BCM)".
OK or NG
OK >> GO TO 12.
NG >> GO TO 10.
10.CHECK BCM INPUT (FAN ON) SIGNAL
1. Turn ignition switch ON.
2. Turn blower control dial to "1" position.
3. Confirm fan on signal between front air control harness connec- tor M33 terminal 14 and ground using oscilloscope.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .CHECK CIRCUIT CONTINUITY BETWEE N BCM AND FRONT AIR CONTROL
1 - 27
:Continuity should exist
SJIA0759E
FAN CONTROL DIAL ON : FAN ON SIG ON
FAN CONTROL DIAL OFF : FAN ON SIG OFF
Te r m i n a l s
Vo l ta g e
(Approx.)
(+)
(-)
Connector Terminal
Front air con- trol: M33 14 Ground
SJIA0750E
ZJIA0583J
Revision: May 2010
2011 Versa

MTC-42
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1. Turn ignition switch OFF.
2. Disconnect front air control connector and BCM connector.
3. Check continuity between BCM harness connector M18 (A) ter-minal 28 and front air control harness connector M33 (B) termi-
nal 14.
OK or NG
OK >> GO TO 12.
NG >> Repair harness or connector.
12.CHECK FAN SWITCH CIRCUIT
1. Turn blower control dial to the OFF position.
2. Check continuity between front air control terminals 9 and 14.
OK or NG
OK >> GO TO 13.
NG >> Replace front air control. Refer to MTC-57, "
Disassem-
bly and Assembly".
13.CHECK FRONT AIR CONTROL GROUND CIRCUIT
Check continuity between front air control harness connector M33
terminal 9 and ground.
OK or NG
OK >> GO TO 14.
NG >> Repair harness or connector.
14.CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
1. Reconnect BCM connector and front air control connectors.
2. Turn ignition switch ON.
3. Turn blower control dial clockwise to position "1".
4. Confirm compressor on signal between front air control harness connector M33 terminal 1 and ground using oscilloscope.
AB Continuity
Connector Terminal Connector Terminal
BCM: M18 28 Front air control:
M33 14
Yes
SJIA0751E
9 - 14 :Continuity should exist
SJIA0753E
9 - Ground :Continuity should exist
SJIA0754E
SJIA0755E
Revision: May 2010 2011 Versa

TROUBLE DIAGNOSISMTC-43
< SERVICE INFORMATION >
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OK or NG
OK >> GO TO 15.
NG >> GO TO 17.
15.CHECK A/C SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. While pressing the A/C switch, check continuity between front air control terminals 1 and 8.
OK or NG
OK >> GO TO 16.
NG >> Replace front air control. Refer to MTC-57, "
Disassem-
bly and Assembly".
16.CHECK FRONT AIR CONTROL GROUND CIRCUIT
Check continuity between front air control harness connector M33
terminal 8 and ground.
OK or NG
OK >> GO TO 17.
NG >> Repair harness or connector.
17.CHECK POWER SUPPLY FOR THERMO CONTROL AMP.
1. Turn ignition switch OFF.
2. Disconnect thermo control amp. connector.
3. Turn ignition switch ON.
4. Confirm thermo amp signal between thermo control amp. har- ness connector M42 terminal 3 and ground using oscilloscope.
Te r m i n a l s
Voltag e
(Approx.)
(+)
(-)
Connector Terminal
Front air control: M33 1Ground
ZJIA0584J
1 - 8
:Continuity should exist
SJIA0756E
8 - Ground :Continuity should exist
SJIA0758E
SJIA0760E
Revision: May 2010 2011 Versa

MTC-44
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
OK or NG
OK >> • GO TO 18 (with CVT).• GO TO 19 (without CVT).
NG >> GO TO 21.
18.CHECK THERMO CONTROL AMP. GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between thermo control amp. harness connec- tor M42 terminal 2 and ground.
OK or NG
OK >> Repair thermo control amp. jumper as necessary.
NG >> Repair harness or connector.
19.CHECK POWER SUPPLY FOR THERMO CONTROL AMP.
Check voltage between thermo control amp. harness connector M42
terminal 1 and ground.
OK or NG
OK >> GO TO 20.
NG >> Check power supply circuit and 10A fuse [No. 16, located in the fuse block (JB)]. Refer to PG-73
.
• If fuse is OK, check harness for open circuit. Repair or
replace if necessary.
• If fuse is NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
20.CHECK THERMO CONTROL AMP. GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between thermo control amp. harness connec- tor M42 terminal 2 and ground.
OK or NG
OK >> Replace thermo control amp. Refer to MTC-58,
"Removal and Installation".
NG >> Repair harness or connector.
21.CHECK CIRCUIT CONTINUITY BETWEEN THERMO CONTROL AMP. AND BCM
Te r m i n a l s
Vo l ta g e
(Approx.)
(+)
(-)
Connector Terminal
Thermo control amp.: M42 3Ground
ZJIA0719J
2 - Ground
:Continuity should exist
SJIA0763E
1 - Ground :Battery voltage
SJIA0762E
2 - Ground:Continuity should exist
SJIA0763E
Revision: May 2010 2011 Versa