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

Refer to 

HAC-140, "Intake Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> 1.

Replace front air control. Refer to XX.

2.

Go to self-diagnosis 

HAC-98, "Front Air Control Self-Diagnosis"

 and perform self-diagnosis

STEP-2. Confirm that code No. 20 is displayed.

NO

>> 1.

Replace intake sensor. Refer to XX.

2.

Go to self-diagnosis 

HAC-98, "Front Air Control Self-Diagnosis"

 and perform 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.

Go to self-diagnosis 

HAC-98, "Front Air Control Self-Diagnosis"

 and perform 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