Infiniti G20 (P11). Manual — part 428
RHA654F
3.
Confirm that discharge air comes out according to the air dis-
tribution table at left.
Refer to “Discharge Air Flow” (HA-21).
Intake door position is checked in the next step.
If NG, go to trouble diagnosis procedure for mode door motor
(HA-48).
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (visual inspec-
tion) and intake door position is at FRESH when the DEF
is
selected.
RHA459G
4. Check Recirculation
NCHA0019S0204
1.
Press REC
switch.
Recirculation indicator should illuminate.
2.
Listen for intake door position change (you should hear blower
sound change slightly).
If NG, go to trouble diagnosis procedure for intake door (HA-58).
If OK, continue with next check.
RHA460G
5. Check Temperature Decrease
NCHA0019S0205
1.
Press the temperature decrease button until 18°C (65°F) is
displayed.
2.
Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient cooling
(HA-80).
If OK, continue with next check.
RHA461G
6. Check Temperature Increase
NCHA0019S0206
1.
Press the temperature increase button until 32°C (85°F) is
displayed.
2.
Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heating
(HA-88).
If OK, continue with next check.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Operational Check (Cont’d)
HA-43
RHA462G
7. Check ECON (Economy) Mode
NCHA0019S0207
1.
Set the temperature 75°F or 25°C.
2.
Press ECON switch.
3.
Display should indicate ECON (no AUTO).
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 (HA-92).
If OK, continue with next check.
RHA463G
8. Check AUTO Mode
NCHA0019S0208
1.
Press AUTO switch.
2.
Display should indicate AUTO (no 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 (HA-45),
then if necessary, trouble diagnosis procedure for magnet clutch
(HA-73).
If all operational check are OK (symptom can not be duplicated),
go to “Incident Simulation Tests” (GI section) and perform tests as
outlined to simulate driving conditions environment. If symptom
appears, refer to “Symptom Table” (HA-41) and perform applicable
trouble diagnosis procedures.
TROUBLE DIAGNOSES
AUTO
Operational Check (Cont’d)
HA-44
A/C System
TROUBLE DIAGNOSIS PROCEDURE FOR A/C SYSTEM
=NCHA0089
SYMPTOM:
I
A/C system does not come on.
INSPECTION FLOW
SHA348F
*1: HA-45
*2: HA-42
*3: HA-46
RHA464G
COMPONENT DESCRIPTION
NCHA0037
Automatic Amplifier (Auto Amp.)
NCHA0037S01
The auto amplifier has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The mode door motor, air mix door motor, intake door
motor, blower motor and compressor are then controlled.
The auto amplifier is unitized with control mechanisms. Signals
from various switches and Potentio Temperature Control (PTC) are
directly entered into auto amplifier.
Self-diagnostic functions are also built into auto amplifier to provide
quick check of malfunctions in the auto air conditioner system.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
A/C System
HA-45
RHA464G
Potentio Temperature Control (PTC)
NCHA0037S03
The PTC is built into the A/C auto amp. It can be set at an interval
of 0.5°C (1.0°F) in the 18°C (65°F) to 32°C (85°F) temperature
range by pushing the temperature button. The set temperature is
digitally displayed.
MAIN POWER SUPPLY AND GROUND CIRCUIT CHECK
NCHA0182
Power Supply Circuit Check
NCHA0182S01
Check power supply circuit for air conditioner system. Refer to
EL-10, “Wiring Diagram — POWER —”.
RHA465G
DIAGNOSTIC PROCEDURE
NCHA0107
SYMPTOM:
I
A/C system does not come on.
RHA398GF
Auto Amp. Check
NCHA0107S01
Check power supply circuit for auto amp. with ignition switch ON.
Measure voltage across terminal Nos. 26, 27, 33 and body ground.
Voltmeter terminal
Voltage
(+)
(−)
26
Body ground
Approx. 12V
27
33
TROUBLE DIAGNOSES
AUTO
A/C System (Cont’d)
HA-46
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