Nissan Teana J32. Manual - part 668

DIAGNOSIS SYSTEM (HVAC)

HAC-41

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10 V
or less, the setting of WORK SUPPORT may be cancelled.

FRE MEMORY SET

• If the ignition switch is turned to the OFF position while the FRE

switch is set to ON (fresh air intake), “Perform the memory” or
“Do not perform the memory” of the FRE switch ON (fresh air in-
take) condition can be selected.

• If “Perform the memory” was set, the FRE switch will be ON

(fresh air intake) when turning the ignition switch to the ON posi-
tion again.

• If “Do not perform the memory” was set, the air inlets will be con-

trolled automatically when turning the ignition switch to the ON
position again.

HAC-11, "Inlet Port Mem-
ory Function (FRE)"

REC MEMORY SET

• If the ignition switch is turned to the OFF position while the REC

switch is set to ON (recirculation), “Perform the memory” or “Do
not perform the memory” of the REC switch ON (recirculation)
condition can be selected.

• If “Perform the memory” was set, the REC switch will be ON (re-

circulation) when turning the ignition switch to the ON position
again.

• If “Do not perform the memory” was set, the air inlets will be con-

trolled automatically when turning the ignition switch to the ON
position again.

HAC-11, "Inlet Port Mem-
ory Function (REC)"

Work item

Description

Reference

HAC-42

< COMPONENT DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

U1000 CAN COMM CIRCUIT

COMPONENT DIAGNOSIS

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000003846322

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with two
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to

LAN-13, "How to Use CAN Communication Signal Chart"

DTC Logic

INFOID:0000000003846323

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000003846324

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III

Turn ignition switch ON and wait for 2 or more seconds.

Using CONSULT-III, perform “SELF-DIAGNOSIS RESULTS” of HVAC.

Is “CAN COMM CIRCUIT” displayed?

YES

>> Perform trouble diagnosis for the CAN communication system. Refer to

LAN-14, "Trouble Diagno-

sis Flow Chart"

>> Perform the intermittent malfunction diagnosis. Refer to

GI-35, "Intermittent Incident"

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

U1000

CAN COMM CIRCUIT

When A/C auto amp. is not transmitting
or receiving CAN communication signal
for 2 or more seconds.

CAN communication system

U1010 CONTROL UNIT (CAN)

HAC-43

< COMPONENT DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000003846325

Initial diagnosis of A/C auto amp.

DTC Logic

INFOID:0000000003846326

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000003846327

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III

Using CONSULT-III, perform “SELF-DIAGNOSIS RESULTS” of HVAC.

Is DTC “U1010” displayed?

YES

>> Replace A/C auto amp.

>> INSPECTION END.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

U1010

CONTROL UNIT (CAN)

When detecting error during the initial diag-
nosis of CAN controller of A/C auto amp.

A/C auto amp.

HAC-44

< COMPONENT DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

B257B, B257C AMBIENT SENSOR

B257B, B257C AMBIENT SENSOR

Description

INFOID:0000000003846328

COMPONENT DESCRIPTION

Ambient Sensor

• The ambient sensor (1) is installed behind left side of front bumper.
• It detects ambient temperature and converts it into a resistance

value which is then input into the A/C auto amp.

Ambient Sensor Circuit

AMBIENT TEMPERATURE INPUT PROCESS

The A/C auto amp. equips a processing circuit for the ambient sensor input. However, when the temperature
detected by the ambient sensor increases quickly, the processing circuit retards the A/C auto amp. function. It
only allows the A/C auto amp. to recognize an ambient temperature increase of 0.33

C (0.6

F) per 100 sec-

onds.
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 increases. This is because the
heat from the engine compartment can radiate to the front bumper area, the location of the ambient sensor.

DTC Logic

INFOID:0000000003846329

DTC DETECTION LOGIC

NOTE:
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to

HAC-

42, "DTC Logic"

HAC-43, "DTC Logic"

• If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [

−

C (

−

F)] and

adjusts the temperature control warmer.

DTC CONFIRMATION PROCEDURE

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III

JPIIA0898ZZ

JPIIA0612GB

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

B257B

AMB TEMP SEN (SHORT)

Detected temperature at ambient sensor

−

C (

−

F) or less

• Ambient sensor
• A/C auto amp.
• Harness and connector

(Ambient sensor circuit is open,
or there is a short in the circuit)

B257C

AMB TEMP SEN (OPEN)

Detected temperature at ambient sensor
100

C (212

F) or more

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