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DI-609
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3W6-09
DTC 32, 42 Air Inlet Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
(V) This sensor detects the position of the air inlet damper and
TPI terminal voltage
4.1 V sends the appropriate signals to the A/C control assembly. The
4
position sensor is built into the air inlet control servomotor.
0.9 V
1
0
100%
Damper opening angle
DTC No. Detection Item Trouble Area
Short to ground or power source circuit in air inlet damper posi-
ower dam er osi S Air inlet damper position sensor
32
tion sensor circuit. S Harness or connector between air inlet control servomotor
Air inlet damper position sensor value does not change even if and A/C control assembly
42 S A/C control assembly
A/C control assembly operates air inlet control servomotor.
WIRING DIAGRAM
A35
Air Inlet Damper Position Sensor A/C Amplifier
(Air Inlet Control Servomotor)
11
VZ 4 Y
A31 S5
7
PT 3 V
A30 TPI
1
GND 5 GR A31 SG
I10328
2002 4RUNNER (RM887U)
Author : Date : 785
DI-610
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminals TPI and SG of A/C control assembly connector.
PREPARATION:
ON
(a) Remove A/C control assembly with connectors still con-
nected (See page AC-84 ).
(b) Turn ignition switch to ON.
CHECK:
Press REC/FRS switch to change air inlet between fresh and
recirculation air and measure voltage between terminals TP1
SG(-) TP1(+) and SG of A/C control assembly when the air inlet servomotor
operates.
OK:
REC/FRS Switch Voltage
REC 3.5 - 4.5 V
FRS 0.5 - 1.8 V
BE3840
I00331 I00338
HINT:
As the air inlet control servomotor is moved from REC side to
FRS side, the voltage decreases gradually without interruption.
NG Go to step 2.
OK
Proceed to next circuit inspection shown on problem symptoms table (See page DI-586 ). Howev-
er, if DTC 32 or 42 is displayed, check and replace A/C control assembly.
2002 4RUNNER (RM887U)
Author : Date : 786
DI-61 1
DIAGNOSTICS - AIR CONDITIONING SYSTEM
2 Check air inlet damper position sensor.
PREPARATION:
(a) Remove air inlet control servomotor (See page AC-46 ).
FRS (b) Disconnect air inlet control servomotor connector.
CHECK:
Measure resistance between terminals 4 and 5 of air inlet con-
trol servomotor connector.
OK:
Resistance : 4.2 - 7.8 k
CHECK:
While operating air inlet control servomotor as in the procedure
REC on page, measure resistance between terminals 3 and 4 of air
inlet control servomotor connector.
5 3 OK:
Resistance :
Damper Position Resistance
REC side 3.4 - 6.4 k
4
FRS side 0.76 - 1.4 k
HINT:
As the air inlet control servomotor is moved from REC side to
I09225
FRS side, the resistance decreases gradually without interrup-
tion.
NG Replace air inlet control servomotor.
OK
3 Check harness and connector between A/C control assembly and air inlet con-
trol servomotor. (See page AC-84 ).
NG Repair or replace harness or connector.
OK
Check and replace A/C control assembly.
2002 4RUNNER (RM887U)
Author : Date : 787
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