Infiniti F50. Manual — part 134
TROUBLE DIAGNOSIS
ATC-61
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ATC
AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER
The trimmer compensates for differences in range of
±
3
°
C (
±
6
°
F) between temperature setting (displayed dig-
itally) and temperature felt by driver.
Operating procedures for this trimmer are as follows:
●
Begin Self-diagnosis STEP-5 mode.
●
Press (fan) UP switch to set system in auxiliary mode.
●
Display shows 61 in auxiliary mechanism. It takes approximately 3 seconds.
●
Turn the temperature dial as desired. Temperature will change at a rate of 0.5
°
C (1.0
°
F) each time a dial
is turned.
When battery cable is disconnected, trimmer operation is canceled. Temperature set becomes that of ini-
tial condition, i.e. 0
°
C (0
°
F).
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TROUBLE DIAGNOSIS
Operational Check
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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.
6.
Confirm that the set temperature remains at previous tempera-
ture.
7.
Press OFF switch.
If NG, go to trouble diagnosis procedure for memory function
If OK, continue with next 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 blower motor
If OK, continue with next check.
CHECKING DISCHARGE AIR
1.
Press mode switch four times and DEF button.
2.
Each position indicator should change shape.
Conditions
:Engine running and at normal operating temperature
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TROUBLE DIAGNOSIS
ATC-63
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ATC
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 intake door motor
ATC-77, "Intake Door Motor Circuit"
.
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (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 intake door
.
If OK, continue with next 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 insufficient cooling
.
If OK, continue with next check.
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TROUBLE DIAGNOSIS
CHECKING TEMPERATURE INCREASE
1.
Turn the temperature dial until 32
°
C (90
°
F) is displayed.
2.
Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heating
If OK, continue with next 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 (visual
inspection). (Discharge air and blower speed will depend on
ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for ECON (Economy) mode
ATC-104, "ECON (ECONOMY) Mode"
If OK, continue with next check.
CHECKING AUTO MODE
1.
Press AUTO switch.
2.
Display should indicate AUTO (not ECON).
●
Confirm that the compressor clutch engages (audio 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 A/C system
"Power Supply and Ground Circuit for Auto Amp."
, then if neces-
sary, trouble diagnosis procedure for magnet clutch
If all operational check are OK (symptom cannot be duplicated), go
to Incident Simulation Tests in
GI-26, "How to Perform Efficient Diag-
nosis for an Electrical Incident"
and perform tests as outlined to sim-
ulate driving conditions environment. If symptom appears, refer to
and perform
applicable trouble diagnosis procedures.
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