2007 NISSAN 350Z Automatic Air Conditioner Workshop Manual

TROUBLE DIAGNOSIS
ATC-89
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AT C
Revision: 2006 November2007 350Z
Insufficient HeatingNJS00017
SYMPTOM: Insufficient heating
INSPECTION FLOW
*1AT C - 5 3 , "Operational Check"*2ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*3ATC-46, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to 7.
*4AT C - 6 3 , "
Air Mix Door Motor Cir-
cuit"
*5ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.*6ATC-56, "
LAN System Circuit"
*7AT C - 6 9 , "Blower Motor Circuit"*8ATC-63, "Air Mix Door Motor Circuit"*9EC-223, "DTC P0117, P0118 ECT
SENSOR"
*10CO-10, "Changing Engine Coolant"*11CO-15, "Checking Radiator Cap"
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ATC-90
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Revision: 2006 November2007 350Z
NoiseNJS00018
SYMPTOM: Noise
INSPECTION FLOW
*1ATC-53, "Operational Check"*2ATC-126, "Check Disc to Pulley
Clearance"
*3AT C - 2 1 , "Maintenance of Lubricant
Quantity in Compressor"
*4EM-12, "Checking Drive Belts"
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TROUBLE DIAGNOSIS
ATC-91
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AT C
Revision: 2006 November2007 350Z
Self-diagnosisNJS00019
SYMPTOM: Self-diagnosis cannot be performed.
INSPECTION FLOW
*1AT C - 5 4 , "Power Supply and Ground
Circuit for Auto Amp."
*2ATC-53, "Operational Check"*3AT C - 3 4 , "SYMPTOM TABLE"
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ATC-92
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Ambient Sensor CircuitNJS0001A
COMPONENT DESCRIPTION
Ambient Sensor
The ambient sensor is attached on the hood lock stay. It detects
ambient temperature and converts it into a resistance value which is
then input into the unified meter and A/C amp.
AMBIENT TEMPERATURE INPUT PROCESS
The unified meter and A/C amp. includes a processing circuit for the ambient sensor input. However, when the
temperature detected by the ambient sensor increases quickly, the processing circuit retards the unified meter
and A/C amp. function. It only allows the unified meter and A/C amp. 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 bumper area, location of the ambient sensor.
DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR
SYMPTOM: Ambient sensor circuit is open or shorted. (LED of A/C
switch does not illuminate as a result of performing self-diagnosis
STEP-2.)
1. CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
1. Disconnect ambient sensor connector.
2. Turn ignition switch ON.
3. Check voltage between ambient sensor harness connector E34
terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
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1 – Ground : Approx. 5 V
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TROUBLE DIAGNOSIS
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AT C
Revision: 2006 November2007 350Z
2. CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between ambient sensor harness connector
E34 terminal 2 and unified meter and A/C amp. harness connec-
tor M50 terminal 49.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK AMBIENT SENSOR
Refer to AT C - 9 4 , "
Ambient Sensor" .
OK or NG
OK >> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
NG >> 1. Replace ambient sensor.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
4. CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between ambient sensor harness connector
E34 terminal 1 and unified meter and A/C amp. harness connec-
tor M50 terminal 39.
4. Check continuity between ambient sensor harness connector
E34 terminal 1 and ground.
OK or NG
OK >> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
NG >> Repair harness or connector.2 – 49 : Continuity should exist.
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1 – 39 : Continuity should exist.
1 – Ground : Continuity should not exist.
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ATC-94
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
COMPONENT INSPECTION
Ambient Sensor
After disconnecting ambient sensor connector E34, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.
If NG, replace ambient sensor.
In-vehicle Sensor CircuitNJS0001B
COMPONENT DESCRIPTION
In-vehicle Sensor
The in-vehicle sensor is located on instrument driver panel lower. It
converts variations in temperature of compartment air drawn from
the aspirator into a resistance value. It is then input into the unified
meter and A/C amp.
Aspirator
The aspirator is located on driver’s side of heater & cooling unit
assembly. It produces vacuum pressure due to air discharged from
the heater & cooling unit assembly, continuously taking compartment
air in the aspirator.
Temperature °C (°F) Resistance kΩ
−15 (5) 12.73
−10 (14) 9.92
−5 (23) 7.80
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
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TROUBLE DIAGNOSIS
ATC-95
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AT C
Revision: 2006 November2007 350Z
DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR
SYMPTOM: In-vehicle sensor circuit is open or shorted. (LED of A/C
switch does not illuminate as a result of performing self-diagnosis
STEP-2.)
1. CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND
1. Disconnect in-vehicle sensor connector.
2. Turn ignition switch ON.
3. Check voltage between in-vehicle sensor harness connector
M42 terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND UNIFIED METER AND A/C
AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between in-vehicle sensor harness connector
M42 terminal 2 and unified meter and A/C amp. harness con-
nector M50 terminal 49.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
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1 – Ground : Approx. 5 V
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2 – 49 : Continuity should exist.
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ATC-96
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
3. CHECK IN-VEHICLE SENSOR
Refer to AT C - 9 6 , "
In-vehicle Sensor" .
OK or NG
OK >> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
NG >> 1. Replace in-vehicle sensor.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
4. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND UNIFIED METER AND A/C
AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between in-vehicle sensor harness connector
M42 terminal 1 and unified meter and A/C amp. harness con-
nector M50 terminal 40.
4. Check continuity between in-vehicle sensor harness connector
M42 terminal 1 and ground.
OK or NG
OK >> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
NG >> Repair harness or connector.
COMPONENT INSPECTION
In-vehicle Sensor
After disconnecting in-vehicle sensor connector M42, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.
If NG, replace in-vehicle sensor.1 – 40 : Continuity should exist.
1 – Ground : Continuity should not exist.
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Temperature °C (°F) Resistance kΩ
−15 (5) 12.73
−10 (14) 9.92
−5 (23) 7.80
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
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