Nissan Tiida C11. Manual — part 869
HAC-140
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
INTAKE SENSOR
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector M51.
3.
Check continuity between intake sensor harness connector M92
(A) terminal 2 and front air control harness connector M51 (B)
terminal 33.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK INTAKE SENSOR
HAC-140, "Intake Sensor Component Inspection"
.
Is the inspection result normal?
YES
>> 1.
Replace front air control. Refer to XX.
2.
HAC-98, "Front Air Control Self-Diagnosis"
STEP-2. Confirm that code No. 20 is displayed.
NO
>> 1.
Replace intake sensor. Refer to XX.
2.
HAC-98, "Front Air Control Self-Diagnosis"
STEP-2. Confirm that code No. 20 is displayed.
4.
CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1.
Turn ignition switch OFF.
2.
Disconnect front air control connector M51.
3.
Check continuity between intake sensor harness connector M92
(A) terminal 1 and front air control harness connector M51 (B)
terminal 29.
4.
Check continuity between intake sensor harness connector M92
(A) terminal 1 and ground.
Is the inspection result normal?
YES
>> 1.
Replace front air control. Refer to XX.
2.
HAC-98, "Front Air Control Self-Diagnosis"
STEP-2. Confirm that code No. 20 is displayed.
NO
>> Repair harness or connector.
Intake Sensor Component Inspection
INFOID:0000000001547445
COMPONENT INSPECTION
Intake Sensor
A
B
Continuity
Connector
Terminal
Connector
Terminal
Intake sensor: M92
2
Front air con-
trol: M51
33
Yes
SJIA0826E
A
B
Continuity
Connector
Terminal
Connector
Terminal
Intake sensor: M92
1
Front air control:
M51
29
Yes
A
Ground
Continuity
Connector
Terminal
Intake sensor: M92
1
No
SJIA0827E
INTAKE SENSOR
HAC-141
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
After disconnecting intake sensor connector M42, measure resis-
tance between terminals 1 and 2 at sensor side, using the table
below.
If NG, replace intake sensor. Refer to XXXX.
Temperature
°
C (
°
F)
Resistance k
Ω
−
15 (5)
12.34
−
10 (14)
9.62
−
5 (23)
7.56
0 (32)
6.00
5 (41)
4.80
10 (50)
3.87
15 (59)
3.15
20 (68)
2.57
25 (77)
2.12
30 (86)
1.76
35 (95)
1.47
40 (104)
1.23
45 (113)
1.04
SJIA0828E
HAC-142
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
PTC HEATER CONTROL SYSTEM
PTC HEATER (300 WATT)
PTC HEATER (300 WATT) : PTC Heater System Description
INFOID:0000000001682706
SYSTEM DESCRIPTION
The PTC heater system is controlled by ambient temperature, water temperature, FAN ON signal and temper-
ature control dial. Hot air is supplied to the discharge air outlets by a PTC heater that generates heat electri-
cally even when engine coolant temperature is low.
Component Parts
PTC heater system components are:
• PTC control unit
• PTC heater
• PTC relay-1
• Water temperature sensor
• Full hot switch
• Ambient sensor
System Operation
PTC heater system starts when all the following conditions are met:
• Less than 35 minutes after ignition switch ON.
• Blower control dial ON (Blower motor operates.) and temperature control dial full hot position (Full hot switch
ON).
• Ambient temperature is lower than 0
°
C (32
°
).
• Engine coolant temperature is lower than 65
°
C (149
°
) (condition
1), or when it becomes lower than 60
°
C (140
°
) again (condition 2)
on startup.
• Engine speed is more than 1100 rpm and after a lapse of more
than 10 seconds.
PTC heater system stops when any of the following conditions is
met:
• More than 35 minutes later after ignition switch ON.
• Blower control dial OFF (Blower motor OFF) and/or temperature
control dial except full hot position (Full hot switch OFF).
• Ambient temperature is higher than 0
°
C (32
°
).
• Engine coolant temperature is higher than 65
°
C (149
°
).
• When engine speed becomes less than 800 rpm.
SJIA0968E
AWIIA0343GB
PTC HEATER CONTROL SYSTEM
HAC-143
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
PTC HEATER (300 WATT) : PTC Heater Component Description
INFOID:0000000001682707
COMPONENT DESCRIPTION
PTC Control Unit
The PTC control unit is attached on the A/C unit assembly. It controls
PTC heater by ambient temperature, water temperature, FAN ON
signal and temperature control dial.
PTC Heater
The PTC heater is attached on the A/C unit assembly. It generates
heat electrically.
Water Temperature Sensor
The water temperature sensor is attached on heater pipe. It detects
water temperature and converts it into a resistance value which is
then input in to PTC control unit.
Full Hot Switch
The full hot switch is attached on the A/C unit assembly. When the
temperature control dial at full hot position, then full hot switch is
turned ON.
Ambient Sensor
SJIA0906E
SJIA0907E
SJIA0908E
SJIA0909E
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