NISSAN TIIDA 2007 Service Repair Manual

HAC-138
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
SUNLOAD SENSOR
Measure voltage between front air control harness connector M51
terminal 31 and ground.
If NG, replace sunload sensor. Refer to XX.
 When checking sunload sensor, select a place where sun shines directly on it.
SJIA0847E
SHA930E

INTAKE SENSOR
HAC-139
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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INTAKE SENSOR
Component InspectionINFOID:0000000001572418
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor (1) is located on the A/C unit. It converts tempera-
ture of air after it passes through the evaporator (2) into a resistance
value which is then input to the front air control.
Intake Sensor Diagnosis ProcedureINFOID:0000000001547444
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (24 or AUTO24 is
indicated on front air control as a result of performing self-diagnosis
STEP-2.)
1.CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Turn ignition switch OFF.
2. Disconnect intake sensor connector M92.
3. Turn ignition switch ON.
4. Check voltage between intake sensor harness connector M92
terminal 1 and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
ZJIA0798J
AWIIA0313GB
Te r m i n a l s
Voltag e
(Approx.) (+) (−)
Connector Terminal
Ground
Intake sensor: M92 1 5V
SJIA0825E

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 InspectionINFOID:0000000001547445
COMPONENT INSPECTION
Intake Sensor
AB
Continuity
Connector Terminal Connector Terminal
Intake sensor: M92 2Front air con-
trol: M5133 Yes
SJIA0826E
AB
Continuity
Connector Terminal Connector Terminal
Intake sensor: M92 1Front air control:
M5129 Yes
A
GroundContinuity
Connector Terminal
Intake sensor: M92 1 No
SJIA0827E

INTAKE SENSOR
HAC-141
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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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 kΩ
−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 DescriptionINFOID: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)]
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PTC HEATER (300 WATT) : PTC Heater Component DescriptionINFOID: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

HAC-144
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
The ambient sensor is attached on the radiator core support upper. It
detects ambient temperature and converts it into a resistance value
which is then input into the front air control.
PTC HEATER (300 WATT) : PTC Heater (300 Watt) Diagnosis ProcedureINFOID:0000000001682708
DIAGNOSTIC PROCEDURE FOR PTC SYSTEM
SYMPTOM: PTC heater system operation is malfunction.
1.CHECK POWER SUPPLY FOR PTC RELAY-1
1. Turn ignition switch ON.
2. Check voltage between PTC relay-1 harness connector E61 ter-
minals 2, 3, and ground.
Is the inspection result normal
YES >> GO TO 2.
NO >> Check power supply circuit and 10A fuse (No. 2) and 40A fusible link (No. I), located in the fuse
and fusible link box.
 If fuses are OK, check harness for open circuit. Repair or replace if necessary.
 If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
2.CHECK PTC RELAY-1
1. Turn ignition switch OFF.
2. Check PTC relay-1. Refer to HAC-151, "
PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component
Inspection".
Is the inspection result normal
YES >> GO TO 3.
NO >> Replace PTC relay-1. Refer to XX.
3.CHECK PTC RELAY-1 OUTPUT CIRCUIT
1. Disconnect ambient sensor, PTC heater and water temperature
sensor connectors.
2. Turn temperature control dial clockwise until full hot position.
3. Turn mode control dial to foot position.
4. Start the engine.
5. Turn blower control dial to maximum speed.
6. Check continuity between PTC relay-1 harness connector E61
terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 5.
AWIIA0600ZZ
Te r m i n a l s
Voltag e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC relay-1: E612
3
SJIA0913E
Connector Terminal
GroundContinuity
PTC relay-1: E61 1 Yes
AWIIA0455ZZ

PTC HEATER CONTROL SYSTEM
HAC-145
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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NO >> GO TO 4.
4.CHECK CIRCUIT CONTINUITY BETWEEN PTC RELAY-1 AND PTC CONTROL UNIT
1. Turn ignition switch OFF.
2. Disconnect PTC control unit connector.
3. Check continuity between PTC control unit harness connector
M84 (A) terminal 2 and PTC relay-1 harness connector E61 (B)
terminal 1.
Is the inspection result normal
YES >> GO TO 5.
NO >> GO TO 7.
5.CHECK CIRCUIT CONTINUITY BETWEEN PTC RELAY-1 AND PTC HEATER
1. Disconnect PTC heater connector.
2. Check continuity between PTC relay-1 harness connector E61
(A) terminal 5 and PTC heater harness connector M66 (B) termi-
nal 1.
Is the inspection result normal
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK PTC HEATER GROUND CIRCUIT
Check continuity between PTC heater harness connector M66 termi-
nal 2 and ground.
Is the inspection result normal
YES >> Replace PTC heater. Refer to XX.
NO >> Repair harness or connector.
7.CHECK POWER SUPPLY VOLTAGE FOR PTC CONTROL UNIT
1. Turn ignition switch ON.
2. Check voltage between PTC control unit harness connector
M84 terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 8.
AB
Continuity
Connector Terminal Connector Terminal
PTC control unit: M84 2PTC relay-1:
E611Yes
AWIIA0456ZZ
AB
Continuity
Connector Terminal Connector Terminal
PTC relay-1:
E615 PTC heater: M66 1 Yes
SJIA0915E
Connector Terminal
GroundContinuity
PTC heater:
M662Yes
SJIA0916E
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC control unit: M84 1
SJIA0911E

HAC-146
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
NO >> Repair harness or connector.
8.CHECK GROUND CIRCUIT FOR PTC CONTROL UNIT
1. Turn ignition switch OFF.
2. Check continuity between PTC control unit harness connector
M84 terminal 7 and ground.
Is the inspection result normal
YES >> GO TO 9.
NO >> Repair harness or connector.
9.CHECK FULL HOT CIRCUIT BETWEEN PTC CONTROL UNIT AND GROUND
1. Reconnect PTC control unit and PTC relay-1 connector.
2. Turn ignition switch ON.
3. Check voltage between full hot switch harness connector M65
terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 12.
NO >> GO TO 10.
10.CHECK CIRCUIT CONTINUITY BETWEEN FULL HOT SWITCH AND PTC CONTROL UNIT
1. Turn ignition switch OFF.
2. Disconnect full hot switch and PTC control unit connector.
3. Check continuity between full hot switch harness connector M65
(A) terminal 1, 2 and PTC control unit harness connector M84
(B) terminal 3, 8.
4. Check continuity between full hot switch harness connector M65 (A) terminal 1, 2 and ground.
Is the inspection result normal
YES >> GO TO 11.
NO >> Repair harness or connector.
11 .CHECK FULL HOT SWITCH
Connector Terminal
GroundContinuity
PTC control unit: M84 7 Yes
SJIA0912E
Te r m i n a l s
ConditionVo l ta g e
(Approx.) (+) (−)
Connector Terminal
Ground
Full hot switch:
M651Temperature control dial:
Full hot position.0V
Temperature control dial:
Except full hot position.5V
AWIIA0457ZZ
AB
Continuity
Connector Terminal Connector Terminal
Full hot switch:
M651
PTC control unit:
M843
Ye s
28
(+) (-) Continuity
Connector Terminal
Ground Yes
Full hot switch: M651
2
AWIIA0458ZZ

PTC HEATER CONTROL SYSTEM
HAC-147
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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Check full hot switch. Refer to HAC-151, "PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component
Inspection".
Is the inspection result normal
YES >> Replace the PTC control unit. Refer to XX.
NO >> Replace full hot switch. Refer to XX.
12.CHECK VOLTAGE BETWEEN WATER TEMPERATURE SENSOR AND GROUND
Check voltage between water temperature sensor harness connec-
tor M64 terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 14.
NO >> GO TO 13.
13.CHECK CIRCUIT CONTINUITY BETWEEN WATER TEMPERATURE SENSOR AND PTC CONTROL
UNIT
1. Turn ignition switch OFF.
2. Disconnect PTC control unit.
3. Check continuity between water temperature sensor harness
connector M64 (A) terminal 1 and PTC control unit harness con-
nector M84 (B) terminal 9.
4. Check continuity between water temperature sensor harness
connector M64 (A) terminal 1 and ground.
Is the inspection result normal
YES >> Replace PTC control unit. Refer to XX.
NO >> Repair harness or connector.
14.CHECK WATER TEMPERATURE SENSOR
Refer to HAC-151, "
PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component Inspection".
Is the inspection result normal
YES >> GO TO 15.
NO >> Replace water temperature sensor. Refer to XX.
15.CHECK CIRCUIT CONTINUITY BETWEEN WATER TEMPERATURE SENSOR AND PTC CONTROL
UNIT
Te r m i n a l s
Vol tag e
(Approx.)
(+) (−)
Connector Terminal
Ground 5V
Water temperature sensor:
M641
SJIA0920E
AB
Continuity
Connector Terminal Connector Terminal
Water temperature
sensor: M641PTC control
unit: M849Yes
A
Continuity
Connector Terminal
Water temperature sensor: M64 1 Ground No
SJIA0921E