Nissan Frontier. Manual — part 873
HAC-46
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace front air control Refer to
.
NO-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to
.
8.
CHECK REFRIGERANT PRESSURE SENSOR
1. Start engine.
2. Check voltage between ECM harness connector F57 terminal 63 and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Refer to
.
9.
CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to
HAC-19, "AIR CONDITIONER : CONSULT Function (BCM - AIR CONDI-
.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 10.
10.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect BCM connector and front air control connector.
3. Check continuity between BCM harness connector M18 (A) ter-
minal 28 and front air control harness connector M52 (B) termi-
nal 5.
4. Check continuity between BCM harness connector M18 (A) ter-
minal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)
Terminals
Condition
Voltage
(+)
(-)
ECM con-
nector
Terminal No.
F57
63
Ground
A/C switch: ON
Approx. 0.36 - 3.88V
FRONT BLOWER CONTROL
DIAL ON
: FAN ON SIG ON
FRONT BLOWER CONTROL
DIAL OFF
: FAN ON SIG OFF
28 - 5
Continuity should exist.
28 - ground
Continuity should not exist.
AWIIA0418ZZ
MAGNET CLUTCH
HAC-47
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
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L
M
A
B
HAC
N
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1. Reconnect BCM connector and front air control connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M52
terminal 5 and ground.
Is the inspection result normal?
YES
>> GO TO 12.
NO-1 >> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to
.
NO-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to
.
12.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
• BCM – ECM
• ECM – IPDM E/R
• ECM – Front air control
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
PCS-28, "Removal and Installation of IPDM E/R"
.
NO
>> Repair or replace malfunctioning part(s).
Terminals
Condition
Voltage
(+)
(-)
Front air con-
trol connector
Terminal No.
M52
5
Ground
A/C switch: ON
Blower motor
operates
Approx. 0V
A/C switch: OFF
Approx. 5V
AWIIA0419ZZ
HAC-48
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AMBIENT SENSOR
AMBIENT SENSOR
Component Description
INFOID:0000000009478292
COMPONENT DESCRIPTION
Ambient Sensor
The ambient sensor (1) is attached on the radiator core support (left
side). It detects ambient temperature and converts it into a 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.
This prevents constant adjustments due to momentary conditions, such as stopping after high speed driving.
Although the actual ambient temperature 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, loca-
tion of the ambient sensor.
Ambient Sensor Diagnosis Procedure
INFOID:0000000009478293
Regarding Wiring Diagram information, refer to
HAC-63, "Wiring Diagram - Automatic Air Conditioner"
DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR
SYMPTOM: Ambient sensor circuit is open or shorted. Using the
CONSULT, DTC B257B or B257C is displayed. Without CONSULT,
code 40 or 41 is indicated on front air control as a result of conduct-
ing the front air control self-diagnosis.
1.
CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
ALIIA0757ZZ
AWIIA0422GB
AMBIENT SENSOR
HAC-49
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Disconnect ambient sensor connector.
2. Turn ignition switch ON.
3. Check voltage between ambient sensor harness connector E28
terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between ambient sensor harness connector
E28 (B) terminal 2 and front air control harness connector M52
(A) terminal 26.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK AMBIENT SENSOR
Check the ambient sensor circuit. Refer to
HAC-49, "Ambient Sensor Component Inspection"
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-7, "Removal and Installation"
2. GO TO
HAC-20, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
NO
>> 1. Replace ambient sensor. Refer to
HA-35, "Removal and Installation"
.
2. GO TO
HAC-20, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
4.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between ambient sensor harness connector
E28 (B) terminal 1 and front air control harness connector M52
(A) terminal 25.
4. Check continuity between ambient sensor harness connector
E28 (B) terminal 2 and ground.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-7, "Removal and Installation"
2. GO TO
HAC-20, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
NO
>> Repair harness or connector.
Ambient Sensor Component Inspection
INFOID:0000000009478294
COMPONENT INSPECTION
Ambient Sensor
After disconnecting ambient sensor connector E28, measure resistance between terminals 1 and 2 at sensor
component side, using the table below.
1 - Ground
: Approx. 5V
AWIIA0161ZZ
2 - 26
: Continuity should exist.
AWIIA1039ZZ
1 - 25
: Continuity should exist.
1 - Ground
: Continuity should not exist.
AWIIA1040ZZ
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