AC(diag)-28
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
8. Diagnostic Procedure for Sensors
A: AMBIENT SENSOR
TROUBLE SYMPTOM:
• Fan speed is not switched when the fan speed control dial is in AUTO position.
• Failure related to the ambient sensor is indicated in self-diagnosis.
WIRING DIAGRAM:
Step
Check
Yes
No
1
CHECK AMBIENT SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ambient
sensor.
3) Measure the resistance between terminals
of ambient sensor.
Terminals
No. 2 — No. 1:
Is the resistance approximately
3 k
:
at 25°C (77°F)?
Go to step
2
.
Replace the ambi-
ent sensor. <Ref.
to AC-41,
REMOVAL, Ambi-
ent Sensor (Auto
A/C Model).>
2
CHECK INPUT SIGNAL FOR AMBIENT SEN-
SOR.
1) Turn the ignition to ON.
2) Measure the voltage between connector
(F78) terminals.
Connector & terminal
(F78) No. 2 (+) — No. 1 (–):
Is the voltage approx. 5 V?
Go to step
6
.
Go to step
3
.
AC-01968
i88
AUTO A/C
CONTROL
MODULE
19
20
JOINT
CONNECTOR
AMBIENT SENSOR
B361
F108
11
10
13
14
F78
1
2
JOINT
CONNECTOR
i77
F78
1 2
26
23
27
24
COMBINATION
METER
i10
I/F
B38
i3
1
2
MICRO COMPUTER
CAN TRANSCEIVER
& RECEIVER
i88
i10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
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