engine NISSAN TIIDA 2007 Service Repair Manual

HAC-130
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
AMBIENT SENSOR
AMBIENT SENSOR
Component DescriptionINFOID:0000000001547435
COMPONENT DESCRIPTION
Ambient Sensor
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.
AMBIENT TEMPERATURE INPUT PROCESS
The front air control includes a processing circuit for the ambient sensor input. However, when the tempera-
ture detected by the ambient sensor increases quickly, the processing circuit retards the front air control func-
tion. It only allows the front air control to recognize an ambient temperature increase of 0.33°C (0.6°F) per 100
seconds.
As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient tem-
perature has not changed, the temperature detected by the ambient sensor will increase. This is because the
heat from the engine compartment can radiate to the front grille area, location of the ambient sensor.
Ambient Sensor Diagnosis ProcedureINFOID:0000000001547436
DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR
SYMPTOM: Ambient sensor circuit is open or shorted. (21 or AUTO21
is indicated on front air control As a result of performing self-diagno-
sis STEP-2.)
1.CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
1. Turn ignition switch OFF.
2. Disconnect ambient sensor connector E60.
3. Turn ignition switch ON.
4. Check voltage between ambient sensor harness connector E60
terminal 2 and ground.
Is the inspection result normal?
YES >> GO TO 2.
AWIIA0600ZZ
AWIIA0306GB
Te r m i n a l s
Vo l ta g e
(Approx.) (+) (−)
Connector Terminal
Ground
Ambient sensor:
E6025V
AWIIA0307ZZ

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

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

HAC-150
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
Is the inspection result normal?
YES >> 1. Replace front air control. Refer to XX.
2. Go to self-diagnosis HAC-213, "
Front Air Control Self-Diagnosis" and perform self-diagnosis
STEP-2. Confirm that code No. 20 is displayed.
NO >> Repair harness or connector.
22.CHECK ENGINE RPM SIGNAL (MANUAL TRANSMISSION)
1. Reconnect PTC control unit.
2. Start the engine.
3. Check voltage between PTC control unit harness connector
M84 terminal 4 and ground.
Is the inspection result normal
YES >> GO TO 24.
NO >> GO TO 23.
23.CHECK CONTINUITY OF ENGINE RPM CIRCUIT BETWEEN FRONT AIR CONTROL AND PTC CON-
TROL UNIT (MANUAL TRANSMISSION)
1. Turn ignition switch OFF.
2. Disconnect ECM and PTC control unit connector.
3. Check continuity between PTC control unit harness connector
M84 (A) terminal 4 and ECM harness connector F10 (B) termi-
nal 13.
4. Check continuity between PTC control unit harness connector
M84 (A) terminal 4 and ground.
Is the inspection result normal
YES >> Replace ECM. Refer to XX.
NO >> Repair harness or connector.
24.CHECK BCM INPUT (FAN ON) SIGNAL
A
GroundContinuity
Connector Terminal
Ambient sensor:
E602No
Te r m i n a l s
Vo l ta g e
(Approx.) (+) (−)
Connector Terminal
Ground
PTC control unit: M84 4 4.2V
SJIA0924E
AB
Continuity
Connector Terminal Connector Terminal
PTC control unit: M84 4 ECM: F10 13 Yes
A
GroundContinuity
Connector Terminal
PTC control unit: M84 4 No
SJIA0925E

PTC HEATER CONTROL SYSTEM
HAC-153
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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After disconnecting full hot switch connector M65, check continuity
between terminals 1 and 2 at switch side.
If NG, replace full hot switch.
PTC relay
Check continuity between terminal Nos. 3 and 5.
If NG, replace PTC relay.
PTC HEATER (1500 WATT)
PTC HEATER (1500 WATT) : System DescriptionINFOID:0000000001682723
SYSTEM DESCRIPTION
The PTC heater system is controlled by ambient temperature, water temperature, FAN ON signal. Hot air is
supplied to a discharge air outlet by PTC heater that generates heat electrically even when engine coolant
temperature is low.
Component Parts
PTC heater system components are: PTC control unit
Terminals Condition Continuity
12Temperature control dial: Full hot
positionYe s
Temperature control dial: Except full
hot positionNo
SJIA0930E
Condition Continuity
12V direct current supply between terminal Nos. 1 and 2 Yes
No current supply No
SJIA0931E

HAC-154
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
 PTC heater
PTC relays
 Ambient sensor
 Blower relay
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.)
 Ambient temperature is lower than 0°C (32°F).
 Engine coolant temperature is lower than 65°C (149°F) (condition
1), or when it becomes lower than 60°C (140°F) 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.
 Fan control dial OFF (Blower motor OFF).
 Ambient temperature is higher than 0°C (32°F).
 Engine coolant temperature is higher than 65°C (149°F).
 When engine speed becomes less than 800 rpm.
PTC HEATER (1500 WATT) : Component DescriptionINFOID:0000000001682724
COMPONENT DESCRIPTION
PTC Control Unit
SJIA0968E
ALIIA0133GB

PTC HEATER CONTROL SYSTEM
HAC-157
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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6.CHECK POWER SUPPLY FOR PTC RELAY-3
Check voltage between PTC relay-3 harness connector E61 termi-
nals 2, 3, and ground.
Is the inspection result normal
YES >> GO TO 5.
NO >> Check power supply circuit and 80A fuse (P, located in the fuse block). Refer to XX-XX.
 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.
7.CHECK PTC RELAYS
1. Turn ignition switch OFF.
2. Check PTC relay. Refer to XX-XX, "*****"
.
Is the inspection result normal
YES >> GO TO 6.
NO >> Replace inoperative PTC relay.
8.CHECK PTC RELAY-1 GROUND CIRCUIT
1. Disconnect ambient sensor, and PTC heater connectors.
2. Turn temperature control dial clockwise until full hot position.
3. Turn mode control dial to foot position.
4. Start the engine (1,000 RPM minimum).
5. Turn blower control dial to low speed.
6. Check continuity between PTC relay-1 harness connector E61
terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 10.
NO >> GO TO 9.
9.CHECK CIRCUIT CONTINUITY BETWEEN PTC RELAY-1 AND BCM
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between PTC relay-1 harness connector E61
(A) terminal 1 and BCM harness connector M19 (B) terminal 64.
Is the inspection result normal
YES >> Replace BCM. Refer to XXXX.
NO >> Repair harness or connector.
10.CHECK PTC RELAY-2 GROUND CIRCUIT
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC relay-3: E632
3
AWIIA0466ZZ
Connector Terminal
GroundContinuity
PTC relay-1: E61 1 Yes
AWIIA0455ZZ
AB
Continuity
Connector Terminal Connector Terminal
PTC relay-1: E61 1 BCM: M19 64 Yes
AWIIA0467ZZ

HAC-160
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
Refer to XX-XX, "*****".
Is the inspection result normal?
YES >> GO TO 18.
NO >> Replace ambient temperature sensor. Refer to XX.
18.CHECK PTC HEATER RELAY-1 POWER SUPPLY CIRCUIT
1. Disconnect PTC heater connector.
2. Reconnect all PTC relays.
3. Start the engine (1,000 RPM minimum).
4. Check voltage between PTC heater harness connector E65 ter-
minal 3 and ground.
Is the inspection result normal?
YES >> GO TO 19.
NO >> Repair harness or connector.
19.CHECK PTC HEATER RELAY-2 POWER SUPPLY CIRCUIT
Check voltage between PTC heater harness connector E65 terminal
2 and ground.
Is the inspection result normal
YES >> GO TO 20.
NO >> Repair harness or connector.
20.CHECK PTC HEATER RELAY-3 POWER SUPPLY CIRCUIT
Check voltage between PTC heater harness connector E65 terminal
1 and ground.
Is the inspection result normal
YES >> Replace PTC heater. Refer to XXXX.
NO >> Repair harness or connector.
PTC HEATER (1500 WATT) : PTC Heater (1500 Watt) Component Inspection
INFOID:0000000001682726
COMPONENT INSPECTION
Blower Relay
Te r m i n a l s
Vol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
PTC heater: E65 3 Battery voltage
AWIIA0472ZZ
Te r m i n a l s
Vol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
PTC heater: E65 2 Battery voltage
AWIIA0474ZZ
Te r m i n a l s
Vol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
PTC heater: E65 1 Battery voltage
AWIIA0476ZZ

AIR CONDITIONER CONTROL
HAC-165
< ECU DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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ECU DIAGNOSIS
AIR CONDITIONER CONTROL
Front Air Control Terminals Reference ValuesINFOID:0000000001547449
Measure voltage between each terminal and ground by following terminals and reference value for front air
control.
PIN CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUE FOR FRONT AIR CONTROL
AWIIA0502ZZ
Te r m i n a l
No.Wire
colorItemIgnition
switchConditionVo l ta g e
(V)
1 LG Power supply for BAT OFF-
Battery voltage
3RPower supply for intake door
PBR (5V output)ON - Approx. 5
4BREngine coolant temperature
sensor signalONAt idle (after warming up, ap-
prox. 80°C)
CAUTION:
The wave forms vary de-
pending on coolant tempera-
ture.
5 B Illumination ground ON - Approx. 0
7 R Power supply for IGN 2 OFF - Battery voltage
9 V PTC Heater ON/OFF signal ON Full Hot switch ON Approx. 12
10 B Ground ON - Approx. 0
12 P Blower motor ON signal ON FAN speed: 1st step (manual)
13 O Compressor ON signal ONA/C switch: ON
(Blower motor operates.)
SKIB3651J
ZJIA0583J
ZJIA0584J

HAC-186
< SYMPTOM DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
INSUFFICIENT COOLING
9.CHECK REFRIGERANT PURITY
1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Check contaminated refrigerant. Refer to HAC-199, "
Working with HFC-134a (R-134a)".
10.CHECK FOR EVAPORATOR FREEZE UP
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES >> Perform performance test diagnoses. Refer to HAC-186, "Performance Test Diagnoses".
NO >> GO TO 11.
11 .CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to HAC-189, "
Test Reading".
Is the inspection result normal?
YES >> Perform performance test diagnoses. Refer to HAC-186, "Performance Test Diagnoses".
NO >> GO TO 12.
12.CHECK AIR DUCTS
Check ducts for air leaks.
Is the inspection result normal?
YES >> System OK.
NO >> Repair air leaks.
Performance Test DiagnosesINFOID:0000000001547453
PERFORMANCE TEST DIAGNOSIS