Infiniti M45 (Y34). Manual — part 143
TROUBLE DIAGNOSIS
ATC-57
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Operational Check
AJS000C7
The purpose of the operational check is to confirm that the system operates properly.
CHECKING MEMORY FUNCTION
1.
Set the temperature 90
°
F or 32
°
C.
2.
Press OFF switch.
3.
Turn the ignition switch OFF.
4.
Turn the ignition switch ON.
5.
Press the AUTO switch (driver side).
6.
Confirm that the set temperature remains at previous tempera-
ture.
7.
Press OFF switch.
If NG, go to trouble diagnosis procedure for
If OK, continue the check.
CHECKING BLOWER
1.
Press fan switch (up side) one time. Blower should operate on
low speed. The fan symbol should have one blade lit .
2.
Press fan switch (up side) one more time, and continue check-
ing blower speed and fan symbol until all speeds are checked.
3.
Leave blower on MAX speed.
If NG, go to trouble diagnosis procedure for
.
If OK, continue the check.
CHECKING DISCHARGE AIR
1.
Press mode switch four times and DEF switch.
2.
Each position indicator should change shape.
Conditions
:Engine running at normal operating temperature
RJIA1275E
RJIA1276E
RJIA1277E
ATC-58
TROUBLE DIAGNOSIS
3.
Confirm that discharge air comes out according to the air distribution table.Refer to
Intake door position is checked in the next step.
If NG, go to trouble diagnosis procedure for
ATC-66, "Mode Door Motor Circuit"
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at
FRESH when the DEF is selected.
CHECKING RECIRCULATION
1.
Press intake switch one time.
2.
Press intake switch again. Recirculation indicator should illumi-
nate.
3.
Listen for intake door position change (you should hear blower
sound change slightly).
If NG, go to trouble diagnosis procedure for
.
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1.
Turn the temperature dial until 18
°
C (60
°
F) is displayed.
2.
Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for
If OK, continue the check.
RJIA1270E
RJIA1278E
RJIA1279E
TROUBLE DIAGNOSIS
ATC-59
C
D
E
F
G
H
I
K
L
M
A
B
ATC
CHECKING TEMPERATURE INCREASE
1.
Turn the temperature dial (driver side) until 32
°
C (90
°
F) is dis-
played.
2.
Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for
If OK, continue the check.
CHECK ECON (ECONOMY) MODE
1.
Set the temperature 75
°
F or 25
°
C.
2.
Press ECON switch.
3.
Display should indicate ECON (not AUTO).
4.
Press ECON switch again. Display should disappear ECON.
●
Confirm that the compressor clutch is not engaged (sound or
visual inspection). (Discharge air and blower speed will
depend on ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for
If OK, continue the check.
CHECKING AUTO MODE
1.
Press AUTO switch (driver side).
2.
Display should indicate AUTO (Not ECON).
●
Confirm that the compressor clutch engages (sound or visual
inspection). (Discharge air and blower speed will depend on
ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for
Supply and Ground Circuit for Auto Amp."
, then if necessary,
trouble diagnosis procedure for
ATC-80, "Magnet Clutch Circuit"
.
If all operational checks are OK (symptom cannot be dupli-
cated), go to Incident Simulation Tests in
Efficient Diagnosis for an Electrical Incident"
as outlined to simulate driving conditions environment. If symptom appears, refer to
and perform applicable trouble diagnosis procedures.
RJIA1280E
RJIA1566E
RJIA1282E
ATC-60
TROUBLE DIAGNOSIS
Power Supply and Ground Circuit for Auto Amp.
AJS000C8
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
COMPONENT DESCRIPTION
Automatic Amplifier (Auto Amp.)
The auto amp. has a built-in microcomputer which processes infor-
mation sent from various sensors needed for air conditioner opera-
tion. The air mix door motor, mode door motor, intake door motor,
blower motor and compressor are then controlled.
The auto amp. is unitized with control mechanisms. When the vari-
ous switches and temperature adjustment dial are operated, data is
input to the auto amp. from the AV C/U or AV and NAVI C/U using
multiplex communication.
Self-diagnostic functions are also built into auto amp. to provide
quick check of malfunctions in the auto air conditioner system.
*1
ATC-61, "DIAGNOSTIC PROCE-
DURE FOR A/C SYSTEM"
*2
*3
ATC-111, "Multiplex Communication
Circuit"
RJIA1283E
RJIA0210E
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