Infiniti G20 (P11). Manual — part 454
How to Perform Trouble Diagnoses for Quick
and Accurate Repair
NCHA0129
WORK FLOW
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SHA900E
*1: HA-148
SYMPTOM TABLE
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Symptom
Reference page
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A/C system does not come on.
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Go to Trouble Diagnosis Procedure for A/C System.
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Intake door does not change in VENT, B/L or FOOT
mode.
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Go to Trouble Diagnosis Procedure for Intake Door.
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Air outlet does not change.
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Mode door motor does not operate normally.
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Go to Trouble Diagnosis Procedure for mode door
motor.
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Air mix door motor does not operate normally.
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Go to Trouble Diagnosis Procedure for Air mix door
motor.
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Blower motor does not rotate at all.
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Go to Trouble Diagnosis Procedure for Blower Motor.
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Magnet clutch does not engage when A/C switch and
fan switch are ON.
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Go to Trouble Diagnosis Procedure for Magnet Clutch.
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Insufficient cooling.
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Go to Trouble Diagnosis Procedure for Insufficient cool-
ing.
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Insufficient heating.
I
Go to Trouble Diagnosis Procedure for Insufficient heat-
ing.
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Noise
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Go to Trouble Diagnosis Procedure for Noise.
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TROUBLE DIAGNOSES
MANUAL
How to Perform Trouble Diagnoses for Quick and Accurate Repair
HA-147
Operational Check
=NCHA0130
The purpose of the operational check is to confirm that the system
operates properly.
CONDITIONS:
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Engine running and at normal operating temperature.
RHA085H
PROCEDURE:
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1. Check Blower
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1.
Turn fan switch to 1-speed.
Blower should operate on 1-speed.
2.
Then turn fan switch to 2-speed, and continue checking blower
speed until all speeds are checked.
3.
Leave blower on 4-speed.
If NG, go to trouble diagnosis procedure for blower motor (HA-167).
If OK, continue with next check.
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2. Check Discharge Air
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1.
Press each mode switch.
RHA654F
2.
Confirm that discharge air comes out according to the air dis-
tribution table at left, and that the indicator lamp illuminates.
Refer to “Discharge Air Flow”, HA-138.
If NG, go to trouble diagnosis procedure for mode door motor
(HA-156).
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
mode is selected.
Confirm that the intake door position is at FRESH when the
D/F
mode is selected.
Intake door position is checked in the next step.
TROUBLE DIAGNOSES
MANUAL
Operational Check
HA-148
RHA087H
3. Check Recirculation
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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-152).
If OK, continue with next check.
NOTE:
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Recirculation does not operate in DEF
and D/F
modes.
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Recirculation automatically occurs when the following
conditions are met:
a)
FACE
mode.
b)
Full cold position.
c)
Fan switch to 4 speed.
d)
A/C switch on.
Recirculation indicator will not illuminate.
RHA088H
4. Check Temperature Decrease
NCHA0130S0204
1.
Slide temperature control lever to full cold.
2.
Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient cooling
(HA-182).
If OK, continue with next check.
RHA089H
5. Check Temperature Increase
NCHA0130S0205
1.
Slide temperature control lever to full hot.
2.
Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heating
(HA-189).
RHA090H
6. Check Air Conditioner Switch
NCHA0130S0206
Turn the fan control switch to the desired (1 to 4 speed) position
and push the A/C switch to turn ON the air conditioner.
The indicator lamp should come on when air conditioner is ON.
If NG, go to trouble diagnosis procedure for magnet clutch
(HA-174).
GI
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EM
LC
EC
FE
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MT
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AX
SU
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ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
MANUAL
Operational Check (Cont’d)
HA-149
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