Infiniti G20 (P11). Manual — part 458
RHA849E
COMPONENT DESCRIPTION
NCHA0141
Air Mix Door Motor
NCHA0141S01
The air mix door motor is attached to the bottom of the heater unit.
It rotates so that the air mix door is opened to a position set by the
PTC. Motor rotation is then conveyed through a shaft and air mix
door position is then fed back to the push control unit by PBR
built-in air mix door motor.
RHA643F
4
5
Air mix door operation
Direction of lever movement
(+)
(−)
COLD
,
HOT
Clockwise
(Toward passenger compart-
ment)
—
—
STOP
STOP
(−)
(+)
HOT
,
COLD
Counterclockwise
(Toward engine compartment)
RHA139H
CONTROL SYSTEM INPUT COMPONENTS
NCHA0144
Potentio Temperature Control (PTC)
NCHA0144S01
The PTC is built into the control unit. It has a variable resistance
which changes according to the set temperature. This resistance
is connected to the temperature control lever.
PTC
NCHA0144S0101
After disconnecting PTC harness connector, measure resistance
between terminals 1 and 2 at PTC harness side.
SHA938E
RHA644F
PBR
NCHA0144S02
Measure resistance between terminals 1 and 2 at vehicle harness
side.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
MANUAL
Air Mix Door (Cont’d)
HA-163
RHA140H
SHA923DA
Ignition Switch: ON
NCHA0144S0201
I
Ensure tester pointer deflects smoothly when PTC is moved
from full cool to full hot and vice versa.
TROUBLE DIAGNOSES
MANUAL
Air Mix Door (Cont’d)
HA-164
AIR MIX DOOR MOTOR CIRCUIT
=NCHA0142
SYMPTOM:
I
Air mix door motor does not operate normally.
1
CHECK POWER SUPPLY FOR PUSH CONTROL UNIT
Refer to Main Power Supply and Ground Circuit Check (HA-151).
OK or NG
OK
©
GO TO 2.
NG
©
Repair or replace.
2
CHECK PTC
Refer to CONTROL SYSTEM INPUT COMPONENTS HA-163.
OK or NG
OK
©
GO TO 3.
NG
©
Replace PTC.
3
CHECK PBR
Refer to CONTROL SYSTEM INPUT COMPONENTS HA-163.
OK or NG
OK
©
GO TO 4.
NG
©
Replace PBR.
4
CHECK FOR OUTPUT OF PUSH CONTROL UNIT
Do approx. 10.5 volts exist between air mix door motor harness terminal Nos. 4, 5 and body ground?
RHA612FD
MTBL0379
Yes or No
Yes
©
GO TO 5.
No
©
Replace auto amp.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
MANUAL
Air Mix Door (Cont’d)
HA-165
5
CHECK CIRCUIT CONTINUITY BETWEEN AIR MIX DOOR MOTOR AND PUSH CONTROL UNIT
Check circuit continuity between air mix door motor harness terminal Nos. 5 (4) and push control unit harness terminal
Nos. 32 (30).
Continuity should exist.
RHA137H
If OK, check harness for short.
OK or NG
OK
©
Replace air mix door motor.
NG
©
Repair harness or connector.
RHA138H
CONTROL LINKAGE ADJUSTMENT
NCHA0143
Air Mix Door
NCHA0143S01
1.
Install air mix door motor on heater unit and connect it to the
air mix door motor harness.
2.
Set PTC at full cool and air mix door motor at “full cold”.
3.
Move air mix door lever by hand and hold it at the full-cold
position.
4.
Attach air mix door lever to rod holder.
5.
Check that air mix door operates properly when PTC is moved
from full cool to full hot.
SHA522E
Water Cock Control Rod
NCHA0143S02
I
Remove the air mix door motor before adjusting water
cock control rod.
1.
Push air mix door lever in direction of arrow.
2.
Pull control rod of water cock in direction of arrow so as to
make clearance of about 2 mm (0.08 in) between ends of rod
and link lever and connect the rod to door lever.
After connecting control rod, check it operates properly.
TROUBLE DIAGNOSES
MANUAL
Air Mix Door (Cont’d)
HA-166
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