Infiniti G20 (P11). Manual — part 432
SYSTEM DESCRIPTION
=NCHA0056
Component Parts
NCHA0056S01
Intake door control system components are:
1) Auto amp.
2) Intake door motor
3) A/C LAN system (PBR built-in mode motor and air mix door motor)
4) In-vehicle sensor
5) Ambient sensor
6) Sunload sensor
7) Intake sensor
System Operation
NCHA0056S02
The intake door control determines intake door position based on the ambient temperature, the intake air
temperature and the in-vehicle temperature. When the ECON, DEFROST, or OFF switches are pushed, the
auto amplifier sets the intake door at the “Fresh” position.
RHA935G
Intake Door Control Specification
NCHA0056S03
RHA194H
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Intake Door Motor (Cont’d)
HA-59
RHA050H
COMPONENT DESCRIPTION
NCHA0057
The intake door motor is attached to the intake unit. It rotates so
that air is drawn from inlets set by the auto amplifier. Motor rota-
tion is conveyed to a lever which activates the intake door.
RHA051H
DIAGNOSTIC PROCEDURE
NCHA0058
SYMPTOM: Intake door motor does not operate normally.
I
Perform Self-diagnosis STEPS 1 before referring to the
test group.
1
CHECK BODY GROUND CIRCUIT FOR INTAKE DOOR MOTOR
Does continuity exist between intake door harness terminal No. 5 and body ground?
RHA052H
Yes or No
Yes
©
GO TO 2.
No
©
Repair harness or connector.
TROUBLE DIAGNOSES
AUTO
Intake Door Motor (Cont’d)
HA-60
2
CHECK FOR AUTO AMP. OUTPUT
Set up Self-diagnosis STEP 4.
Measure voltage across auto amp. harness terminals and body ground.
RHA493GB
MTBL0076
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 3.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Intake Door Motor (Cont’d)
HA-61
3
CHECK CIRCUIT CONTINUITY BETWEEN EACH TERMINAL ON AUTO AMP. AND ON INTAKE DOOR
MOTOR
RHA053H
MTBL0377
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
GO TO 4.
NG
©
Repair harness or connector.
TROUBLE DIAGNOSES
AUTO
Intake Door Motor (Cont’d)
HA-62
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