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DI-606
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3W5-09
DTC 31, 41 Air Mix Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
(V) This sensor detects the position of the air inlet damper and
TPI terminal voltage
4 sends the appropriate signals to the A/C control assembly. The
position sensor is built into the air inlet control servomotor.
1
0
100%
Damper opening angle
DTC No. Detection Item Trouble Area
Short to ground or power source circuit in air mix damper posi-
ower dam er osi S Air mix damper position sensor
31
tion sensor circuit. S Harness or connector between air inlet control servomotor
Air mix damper position sensor value does not change even if and A/C control assembly
41 S A/C assembly
A/C control assembly operates air inlet control servomotor.
WIRING DIAGRAM
A36
Air Mix Damper Position A/C Amplifier
Sensor (Air Mix Control Servomotor)
11
VZ 6 Y
A31 S5
G
8
PT 7 B
A30 TP
B
Y 1
SG 5 GR
A31 SG
I10328
2002 4RUNNER (RM887U)
Author : Date : 782
DI-607
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminals TP 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:
Change the set temperature to activate the air mix damper, and
measure the voltage between terminals TP and SG of A/C con-
SG(-) TP(+) trol assembly connector each time when the set temperature is
changed.
OK:
Set Temperature Voltage
Max. cool 3.5 - 4.5 V
BE3840
Max. hot 0.5 - 1.8 V
I00329 I00337
HINT:
As the set temperature increases, the voltage decreases grad-
ually 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 31 or 41 is displayed, check and replace A/C control assembly.
2002 4RUNNER (RM887U)
Author : Date : 783
DI-608
DIAGNOSTICS - AIR CONDITIONING SYSTEM
2 Check air mix damper position sensor.
PREPARATION:
Max. Cool
Remove air mix control servomotor (See page AC-34 ).
CHECK:
Measure resistance between terminals 4 and 5 of air inlet con-
Max. Hot trol servomotor connector.
OK:
Resistance: 4.8 - 7.2 k
CHECK:
While operating air mix control servomotor as shown in the pro-
cedure on page DI-612 , measure resistance between termi-
4 nals 3 and 5 of air mix control servomotor connector.
OK:
Position Resistance
Max. cool 3.8 - 5.8 k
Max. hot 0.95 - 1.45 k
5
HINT:
3
As the air inlet control servomotor moves from cool side to hot
side, the resistance decreases gradually without interruption.
I09231
NG Replace air mix control servomotor.
OK
3 Check harness and connector between A/C control assembly and air mix control
servomotor. (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace A/C control assembly.
2002 4RUNNER (RM887U)
Author : Date : 784
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