Nissan Tiida C11. Instruction — part 870
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 Procedure
INFOID: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
.
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
Terminals
Voltage
(Approx.)
(+)
(
−
)
Connector
Terminal
Ground
Battery voltage
PTC relay-1: E61
2
3
SJIA0913E
Connector
Terminal
Ground
Continuity
PTC relay-1: E61
1
Yes
AWIIA0455ZZ
PTC HEATER CONTROL SYSTEM
HAC-145
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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.
A
B
Continuity
Connector
Terminal
Connector
Terminal
PTC control unit: M84
2
PTC relay-1:
E61
1
Yes
AWIIA0456ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
PTC relay-1:
E61
5
PTC heater: M66
1
Yes
SJIA0915E
Connector
Terminal
Ground
Continuity
PTC heater:
M66
2
Yes
SJIA0916E
Terminals
Voltage
(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
Ground
Continuity
PTC control unit: M84
7
Yes
SJIA0912E
Terminals
Condition
Voltage
(Approx.)
(+)
(
−
)
Connector
Terminal
Ground
Full hot switch:
M65
1
Temperature control dial:
Full hot position.
0V
Temperature control dial:
Except full hot position.
5V
AWIIA0457ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
Full hot switch:
M65
1
PTC control unit:
M84
3
Yes
2
8
(+)
(-)
Continuity
Connector
Terminal
Ground
Yes
Full hot switch: M65
1
2
AWIIA0458ZZ
PTC HEATER CONTROL SYSTEM
HAC-147
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Check full hot switch. Refer to
HAC-151, "PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component
.
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
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
Terminals
Voltage
(Approx.)
(+)
(
−
)
Connector
Terminal
Ground
5V
Water temperature sensor:
M64
1
SJIA0920E
A
B
Continuity
Connector
Terminal
Connector
Terminal
Water temperature
sensor: M64
1
PTC control
unit: M84
9
Yes
A
Continuity
Connector
Terminal
Water temperature sensor: M64
1
Ground
No
SJIA0921E
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