Nissan Titan. Instruction — part 408
MAGNET CLUTCH
HAC-137
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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HAC
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MAGNET CLUTCH
System Description
INFOID:0000000009882532
SYSTEM DESCRIPTION
The front air control controls compressor operation based on ambient and intake temperature and a signal
from ECM.
Low Temperature Protection Control
The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sen-
sor and the ambient sensor.
When intake air temperature is higher than the preset value, the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than the preset value. That preset value is dependent on the ambi-
ent temperature, refer to the following table.
Magnet Clutch Component Function Check
INFOID:0000000009882533
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH
1. Turn ignition switch ON.
2. Turn the blower control dial to low speed and press the A/C switch.
3. Press vent mode switch (
).
4. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower
speed will depend on ambient, in-vehicle and set temperatures.)
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-137, "Magnet Clutch Diagnosis Procedure"
.
Magnet Clutch Diagnosis Procedure
INFOID:0000000009882534
Regarding Wiring Diagram information, refer to
HAC-155, "Wiring Diagram - Instruction With 2 Control Dial Sys-
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
Ambient temperature
°C (°F) Compressor ON intake temperature °C (°F)
Compressor OFF intake temperature
°C (°F)
0 (32)
5.5 (42)
5.0 (41)
10 (50)
5.5 (42)
5.0 (41)
20 (68)
5.5 (42)
5.0 (41)
30 (86)
4.0 (39)
3.5 (38)
40 (104)
3.5 (38)
3.0 (37)
50 (122)
3.5 (38)
3.0 (37)
HAC-138
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.
CHECK INTAKE AND AMBIENT SENSOR CIRCUITS
Check intake and ambient sensors. Refer to
HAC-114, "Front Air Control Self-Diagnosis"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> • Malfunctioning intake sensor. Refer to
HAC-147, "Intake Sensor Diagnosis Procedure"
.
• Malfunctioning ambient sensor. Refer to
HAC-144, "Ambient Sensor Diagnosis Procedure"
.
2.
PERFORM AUTO ACTIVE TEST
PCS-11, "Diagnosis Description"
Does magnet clutch operate?
YES
>> •
WITH CONSULT
GO TO 5.
•
WITHOUT CONSULT
GO TO 6.
NO
>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.
3.
CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and compressor (magnet
clutch) connector.
3. Check continuity between IPDM E/R harness connector E119
terminal 11 and A/C compressor harness connector F3 terminal
1.
4. Check continuity between IPDM E/R harness connector E119
terminal 11 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
AWIIA0415GB
11 – 1
: Continuity should exist.
11 – ground
: Continuity should not exist.
WJIA0560E
MAGNET CLUTCH
HAC-139
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
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HAC
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NO
>> Repair harness or connector.
4.
CHECK MAGNET CLUTCH CIRCUIT
Check for operation sound when applying battery voltage direct cur-
rent to terminal.
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
.
NO
>> Replace magnet clutch. Refer to
5.
CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to
BCS-21, "AIR CONDITIONER : CONSULT Function (BCM - AIR
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 6.
6.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect BCM connector and front air control connector.
3. Check continuity between BCM harness connector M18 (A) ter-
minal 27 and front air control harness connector M180 (B) termi-
nal 4.
4. Check continuity between BCM harness connector M18 (A) ter-
minal 27 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK VOLTAGE FOR FRONT AIR CONTROL (A/C COMPRESSOR ON SIGNAL)
1. Reconnect BCM connector and front air control connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector
M180 terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 8.
SJIA0197E
A/C SW ON
: AIR COND SW ON
A/C SW OFF
: AIR COND SW OFF
27 - 4
Continuity should exist.
27 - ground
Continuity should not exist.
AWIIA0416ZZ
Terminals
Condition
Voltage
(+)
(-)
front air con-
trol connec-
tor
Terminal No.
M180
4
Ground
A/C switch: ON
Approx. 0V
A/C switch: OFF
Approx. 5V
AWIIA0417ZZ
HAC-140
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
MAGNET CLUTCH
NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to
.
NO-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to
.
8.
CHECK REFRIGERANT PRESSURE SENSOR
1. Start engine.
2. Check voltage between ECM harness connector F54 terminal
70 and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Refer to
.
9.
CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to
BCS-21, "AIR CONDITIONER : CONSULT Function (BCM - AIR CONDI-
.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 10.
10.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect BCM connector and front air control connector.
3. Check continuity between BCM harness connector M18 (A) ter-
minal 28 and front air control harness connector M180 (B) termi-
nal 5.
4. Check continuity between BCM harness connector M18 (A) ter-
minal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)
Terminals
Condition
Voltage
(+)
(-)
ECM con-
nector
Terminal No.
F54
70
Ground
A/C switch: ON
Approx. 0.36 - 3.88V
LJIA0124E
FRONT BLOWER CONTROL
DIAL ON
: FAN ON SIG ON
FRONT BLOWER CONTROL
DIAL OFF
: FAN ON SIG OFF
28 - 5
Continuity should exist.
28 - ground
Continuity should not exist.
AWIIA0418ZZ
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