engine control system NISSAN TIIDA 2007 Service Repair Manual

HAC-40
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
19.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT TEMPERATURE SENSOR AND PTC CONTROL
UNIT
Check continuity between ambient temperature sensor harness con-
nector M60 (A) terminal 3 and PTC control unit harness connector
M84 (B) terminal 8.
Is the inspection result normal
YES >> 1. If equipped with manual transmission, GO TO 20.
2. If equipped with automatic transmission, GO TO 22.
NO >> Repair harness or connector.
20.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 22.
NO >> GO TO 21.
21.CHECK CONTINUITY OF ENGINE RPM CIRCUIT BETWEEN FRONT AIR CONNTROL 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.
22.CHECK BCM INPUT (FAN ON) SIGNAL
AB
Continuity
Connector Terminal Connector Terminal
Ambient temperature
sensor: M643PTC control unit:
M848Yes
AWIIA0464ZZ
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-43
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
After disconnecting full hot switch connector M65, check continuity
between terminals 1 and 2 at switch side.
If NG, replace full hot switch. Refer to XX.
PTC relay-1
Check continuity between terminal Nos. 3 and 5.
If NG, replace PTC relay-1. Refer to XX.
PTC HEATER (1500 WATT)
PTC HEATER (1500 WATT) : System DescriptionINFOID:0000000001682730
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
Connector Terminals Condition Continuity
Full hot switch:
M6512Temperature 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-44
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
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:0000000001682731
COMPONENT DESCRIPTION
PTC Control Unit
SJIA0968E
ALIIA0133GB

PTC HEATER CONTROL SYSTEM
HAC-47
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
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-50
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
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:0000000001682733
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

INSUFFICIENT COOLING
HAC-73
< SYMPTOM DIAGNOSIS >[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
INSUFFICIENT COOLING
Component Function CheckINFOID:0000000001547073
SYMPTOM: Insufficient cooling
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to maximum cold position.
2. Check for cold air at discharge air outlets.
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to HAC-6, "
Operational Check".
Does another symptom exist?
YES >> Refer to HAC-5, "How to Perform Trouble Diagnosis For Quick and Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK COMPRESSOR DRIVE BELT TENSION
Check compressor belt tension. Refer to EM-15, "
Checking" (HR16DE) or EM-142, "Checking Drive Belts"
(MR18DE), or EM-263, "Inspection and Adjustment" (K9K).
OK or NG
OK >> GO TO 5.
NG >> Adjust or replace compressor belt. Refer to EM-15, "
Checking" (HR16DE) or EM-142, "Checking
Drive Belts" (MR18DE), or EM-263, "Inspection and Adjustment" (K9K)
5.CHECK AIR MIX DOOR CABLE
Check and verify air mix door cable operation. Refer to XXXX AIR MIX DOOR CABLE ADJUST.
Does air mix door operate correctly?
YES >> GO TO 6.
NO >> Repair or replace as necessary.
6.CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation. Refer to XX-XX, "*****".
Does cooling fan motor operate correctly?
YES >> GO TO 7.
NO >> Check cooling fan motor. Refer to XX-XX, "*****".
7.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 "PERFORMANCE TEST DIAGNOSIS".
NO >> GO TO 8.
8.CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to "Test Reading".
OK or NG
OK >> GO TO 9.
NG >> Perform performance test diagnoses. Refer to "PERFORMANCE TEST DIAGNOSIS".

HAC-76
< SYMPTOM DIAGNOSIS >[MANUAL AIR CONDITIONER]
INSUFFICIENT COOLING
Testing must be performed as follows:
Test Reading
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
*1: With blower control dial in the "1" position
*2: With blower control dial in the "4" position.
Test ReadingINFOID:0000000001547076
Recirculating-to-discharge Air Temperature Table
Vehicle condition Indoors or in the shade (in a well-ventilated place)
Doors Closed
Door window Open
Hood Open
TEMP. Max. COLD
Mode control dial
(Ventilation) set
Intake door lever
(Recirculation) set
Blower speedMax. speed set
Engine speed Idle speed
Operate the air conditioning system for 10 minutes before taking measurements.
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
°C (°F) Relative humidity
%Air temperature
°C (°F)
50 - 6020 (68) 7.2 - 9.1 (45 - 48)
25 (77) 11.4 - 13.8 (53 - 57)
30 (86) 15.5 - 18.4 (60 - 65)
35 (95) 20.3 - 23.7 (69 - 75)
60 - 7020 (68) 9.1 - 10.9 (48 - 52)
25 (77) 13.8 - 16.2 (57 - 61)
30 (86) 18.4 - 21.3 (65 - 70)
35 (95) 23.7 - 27.1 (75 - 81)
Ambient air
High-pressure (Discharge side)
kPa (bar, kg/cm
2 , psi)Low-pressure (Suction side)
kPa (bar, kg/cm2 , psi) Relative humidity
%Air temperature
°C (°F)
50 - 7020 (68)843 - 1,036 *1
(11.08 - 13.63, 8.6 - 10.6, 122 - 150)159.0 - 194.0
(1.59 - 1.94, 1.62 - 1.98, 23.1 - 28.1)
25 (77)1,094 - 1,338 *1
(10.94 - 13.38, 11.2 - 13.6, 159 - 194)196.3 - 240.0
(1.96 - 2.40, 2.00 - 2.45, 28.5 - 34.8)
30 (86)1,298 - 1,590 *1
(12.98 - 15.90, 13.2 - 16.2, 188 - 231)248.0 - 302.7
(2.48 - 3.03, 2.53 - 3.09, 36.0 - 43.9)
35 (95)1,383 - 1,688 *2
(13.83 - 16.88, 14.1 - 17.2, 201 - 245)308.8 - 377.4
(3.09 - 3.77, 3.15 - 3.85, 44.8 - 54.7)
40 (104)1,628 - 1,988 *2
(16.28 - 19.88, 16.6 - 20.3, 236 - 288)377.4 - 461.2
(3.77 - 4.61, 3.85 - 4.70, 54.7 - 66.8)

INSUFFICIENT HEATING
HAC-81
< SYMPTOM DIAGNOSIS >[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
INSUFFICIENT HEATING
Component Function CheckINFOID:0000000001547078
SYMPTOM: Insufficient heating
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn temperature control dial clockwise to maximum heat position.
2. Check for hot air at discharge air outlets.
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to HAC-6, "
Operational Check".
Does another symptom exist?
YES >> Refer to HAC-5, "How to Perform Trouble Diagnosis For Quick and Accurate Repair" .
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK COOLANT SYSTEM
1. Check engine coolant level. Refer to XX-XX, "*****" .
2. Check hoses for leaks or kinks.
3. Check Radiator cap. Refer to XX-XX, "*****" .
OK or NG
OK >> GO TO 5.
NG >> Repair/replace as necessary.
5.CHECK AIR MIX DOOR CABLE
Check air mix door cable operation. Refer to XXXX AIR MIX DOOR CABLE ADJUSTMENT .
OK or NG
YES >> GO TO 6.
NO >> Adjust or replace air mix door cable. Refer to XXXX AIR MIX DOOR CABLE ADJUST. .
6.CHECK AIR DUCTS
Check ducts for air leaks.
OK or NG
OK >> GO TO 7.
NG >> Repair air leaks.
7.CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses.
Is the inlet hose hot and the outlet hose warm?
YES >> GO TO 8.
NO >> Both hoses warm: GO TO 9.
8.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check engine control temperature sensor. Refer to XX-XX, "*****" .
OK or NG
OK >> System OK.

INSPECTION AND ADJUSTMENT
HAC-87
< BASIC INSPECTION >[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
INSPECTION AND ADJUSTMENT
Operational CheckINFOID:0000000001547386
The purpose of the operational check is to confirm that the system operates properly.
CHECKING MEMORY FUNCTION
1. Press temperature control switch (UP: ) until 32°C is displayed.
2. Press OFF switch.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous temperature.
7. Press OFF switch.
If NG, go to trouble diagnosis procedure for HAC-198, "
Memory Function Check".
If OK, continue the check.
CHECKING BLOWER
1. Press blower motor switch (UP: ). Blower should operate on low speed. The fan symbol should have one
blade lit.
2. Press blower motor switch (UP: ), and continue checking blower speed and fan symbol until all speeds
are checked.
3. Leave blower on max. speed.
If NG, go to trouble diagnosis procedure for HAC-120, "
Front Blower Motor Diagnosis Procedure".
If OK, continue the check.
CHECKING DISCHARGE AIR
1. Press MODE switch and DEF switch.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-94, "
Discharge
Air Flow".
Intake door position is checked in the next step.
If NG, go to trouble diagnosis procedure for HAC-109, "
Mode Door Motor Diagnosis Procedure".
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at
FRESH when the DEF is selected.
CHECKING RECIRCULATION
1. Press recirculation (REC) switch one time. Recirculation LED should illuminate.
2. Press fresh (FRE) switch one time. Fresh LED should illuminate.
3. Listen for intake door position change (you should hear blower sound change slightly).
If NG, go to trouble diagnosis procedure for HAC-116, "
Intake Door Motor Diagnosis Procedure".
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Press temperature control switch (UP: ) until 32°C is displayed.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for HAC-193, "
Component Function Check".
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1. Press temperature control switch (DOWN: ) until 18°C is displayed. Conditions : Engine running at usual operating temperature

HAC-98
< FUNCTION DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
SELF-DIAGNOSIS FUNCTION
SELF-DIAGNOSIS FUNCTION
Front Air Control Self-DiagnosisINFOID:0000000001547401
DESCRIPTION
The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from usual control to the self-diagnostic system is accomplished by
starting the engine (turning the ignition switch ON) and pressing OFF switch for at least 5 seconds. The OFF
switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system
will be cancelled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step to
another is accomplished by means of pushing front air control switches, as required.
Additionally shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pushing blower
motor switch (UP: ).
FUNCTION CONFIRMATION PROCEDURE
1.SET IN SELF-DIAGNOSTIC MODE
1. Turn ignition switch ON.
2. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.
AWIIA0284GB