Nissan Sentra. Instruction — part 561
HAC-92
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR
4. Change fan speed from 1st – 7th, and check duty ratios between variable blower control harness connec-
tor and ground by using an oscilloscope.
NOTE:
Calculate the drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms
Is the inspection result normal?
YES
>> Replace variable blower control. Refer to
HAC-113, "Removal and Installation"
.
NO
>> GO TO 10.
10.
CHECK VARIABLE BLOWER CONTROL CONTROL SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect variable blower control connector and A/C auto amp. connector.
3. Check continuity between variable blower control harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK VARIABLE BLOWER CONTROL CONTROL SIGNAL CIRCUIT FOR SHORT
Check continuity between variable blower control harness connector and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-105, "Removal and Installation"
.
NO
>> Repair harness or connector.
Component Inspection (Blower Motor)
INFOID:0000000009757688
1.
CHECK BLOWER MOTOR
1. Connect battery voltage to terminal 1 of blower motor.
2. Connect ground to terminal 2 of blower motor.
Does the blower fan operate?
YES
>> Intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace blower motor. Refer to
VTL-10, "Removal and Installation"
.
+
−
Condition
Duty ratio
(Approx.)
Output waveform
Variable blower control
Connector
Terminal
Fan speed (instruction)
Air outlet: VENT
M52
2
Ground
1st
26%
2nd
34%
3rd
41%
4th
51%
5th
62%
6th
73%
7th
82%
JPIIA1646GB
Variable blower control
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M52
2
M34
13
Yes
Variable blower control
—
Continuity
Connector
Terminal
M52
2
Ground
No
BLOWER MOTOR
HAC-93
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Component Inspection (Blower Motor Relay)
INFOID:0000000009757689
1.
CHECK BLOWER RELAY
1. Turn ignition switch OFF.
2. Remove blower motor relay.
3. Check continuity between blower motor relay terminals 3 and 5
when voltage is supplied between terminals 1 and 2.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace blower motor relay.
Terminals
Voltage
Continuity
3
5
ON
Yes
OFF
No
JSIIA1551ZZ
HAC-94
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
MAGNET CLUTCH
Component Function Check
INFOID:0000000009757690
1.
CHECK MAGNET CLUTCH OPERATION
Perform auto active test of IPDM E/R. Refer to
PCS-9, "Diagnosis Description"
Does it operate normally?
YES
>> Inspection End.
NO
>> Refer to
Diagnosis Procedure
INFOID:0000000009757691
Regarding Wiring Diagram information, refer to
1.
CHECK FUSE
1. Turn ignition switch OFF.
2. Check 10A fuse (No. 39, located in IPDM E/R).
NOTE:
PG-49, "IPDM E/R Terminal Arrangement"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the blown fuse after repairing the affected circuit.
2.
CHECK MAGNET CLUTCH POWER SUPPLY CIRCUIT
1. Disconnect compressor connector and IPDM E/R connector.
2. Check continuity between compressor harness connector and IPDM E/R harness connector.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK MAGNET CLUTCH GROUND CIRCUIT
1. Disconnect compressor connector.
2. Check continuity between compressor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK MAGNET CLUTCH
Directly apply battery voltage to the magnet clutch. Check operation visually and by sound.
Does it operate normally?
YES
>> Replace IPDM E/R. Refer to
PCS-30, "Removal and Installation"
NO
>> Replace magnet clutch. Refer to
HA-31, "MAGNET CLUTCH : Removal and Installation"
.
Compressor
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
F3
1
E43
12
Yes
Compressor
Continuity
Connector
Terminal
F3
2
Ground
Yes
ECV (ELECTRICAL CONTROL VALVE)
HAC-95
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
ECV (ELECTRICAL CONTROL VALVE)
Diagnosis Procedure
INFOID:0000000009757692
Regarding Wiring Diagram information, refer to
1.
CHECK ECV (ELECTRICAL CONTROL VALVE) POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect compressor connector.
3. Turn ignition switch ON.
4. Check voltage between compressor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK FUSE
1. Turn ignition switch OFF.
2. Check 10 A fuse [No. 5, located in fuse block (J/B)]. Refer to
Is the inspection result normal?
YES
>> Repair harness or connector.
NO
>> Replace the blown fuse after repairing the affected circuit.
3.
CHECK ECV CONTROL SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between compressor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK ECV CONTROL SIGNAL CIRCUIT FOR SHORT
Check continuity between compressor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair harness or connector.
5.
CHECK ECV
Check ECV. Refer to
HAC-96, "Component Inspection"
+
−
Voltage
Compressor
Connector
Terminal
F10
3
Ground
Battery voltage
Compressor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
F10
4
M34
1
Yes
Compressor
—
Continuity
Connector
Terminal
F10
4
Ground
No
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