Infiniti M35/M45 Y50. Manual - part 122

AIR CONDITIONER CONTROL

ATC-39

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ATC

CAN Communication System Description

NJS000GC

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 2
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. For details, refer to 

LAN-50,

"CAN System Specification Chart"

 .

ATC-40

TROUBLE DIAGNOSIS

TROUBLE DIAGNOSIS

PFP:00004

CONSULT-II Function (ECM)

NJS000GD

CONSULT-II can display each diagnosis item using the diagnosis test modes shown following.

CONSULT-II BASIC OPERATION

Refer to 

GI-38, "CONSULT-II Start Procedure"

 .

DATA MONITOR
Operation Procedure

1.

Touch “ENGINE” on “SELECT SYSTEM” screen.

2.

Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.

3.

Touch “SELECTION FROM MENU” on “DATA MONITOR” screen.

4.

When “SELECTION FROM MENU” is selected, touch items to be monitored.

5.

Touch “START”.

6.

Touch “RECORD” while monitoring, then the status of the monitored item can be recorded. To stop
recording, touch “STOP”.

Display Item List

How to Perform Trouble Diagnosis for Quick and Accurate Repair

NJS000GE

WORK FLOW

System part

Check item, diagnosis mode

Description

ECM

Data monitor

Displays ECM input data in real time.

Monitor item name

“operation or unit”

Contents

AIR COND SIG

“ON/OFF”

Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.

HEATER FAN SW

“ON/OFF”

Displays “FAN (ON)/FAN (OFF)” status as judged from blower fan motor switch signal.

IGNITION SW

“ON/OFF”

Displays “IGN position (ON)/OFF, ACC position (OFF)” status as judged from ignition switch signal.

AC PRESS SEN

“V”

Displays “Refrigerant pressure sensor for voltage” status as inputted from refrigerant pressure sen-
sor.

*1

ATC-65, "Operational Check"

SHA900E

TROUBLE DIAGNOSIS

ATC-41

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ATC

SYMPTOM TABLE

Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

ATC-67, "Power 

Supply and Ground 

Circuit for Auto 

Amp."

A/C system cannot be controlled.

Go to Multifunction Switch System.

AV-108, "Multifunc-

tion Switch Cannot 

Be Operated"

 (With-

out mobile enter-

tainment system) or 

AV-249, "Multifunc-

tion Switch Cannot 

Be Operated"

  (With 

mobile entertain-

ment system)

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN)

ATC-76, "Mode 

Door Motor Circuit"

Mode door motor does not operate normally.

Upper ventilator outlet does not change.

Go to Trouble Diagnosis Procedure for Upper Ventilator Door 
Motor. (LAN)

ATC-79, "Upper 

Ventilator Door 

Motor Circuit"

Upper ventilator door motor does not oper-
ate normally.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor. 
(LAN)

ATC-82, "Air Mix 

Door Motor Circuit"

Air mix door motor does not operate nor-
mally.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor. (LAN)

ATC-85, "Intake 

Door Motor Circuit"

Intake door motor does not operate nor-
mally.

Blower motor operation is malfunctioning.

Go to Trouble Diagnosis Procedure for Blower Motor.

ATC-88, "Blower 

Motor Circuit"

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

ATC-93, "Magnet 

Clutch Circuit"

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

ATC-98, "Insufficient 

Cooling"

Go to Diagnosis Procedure for Insufficient Cooling.

ATC-106, "DIAG-

NOSIS PROCE-

DURE FOR 

INSUFFICIENT 

COOLING"

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

ATC-108, "Insuffi-

cient Heating"

Noise

Go to Trouble Diagnosis Procedure for Noise.

ATC-109, "Noise"

Self-diagnosis cannot be performed.

Go to Trouble Diagnosis Procedure for Self-diagnosis.

ATC-110, "Self-diag-

nosis"

Memory function does not operate.

Go to Trouble Diagnosis Procedure for Memory Function.

ATC-111, "Memory 

Function"

Rear control switch does not operate.

Go to Trouble Diagnosis Procedure for Rear Control Switch.

ATC-70, "Rear Con-

trol Switch Circuit"

ATC-42

TROUBLE DIAGNOSIS

Component Parts and Harness Connector Location

NJS000GF

ENGINE COMPARTMENT

RJIA4030E