DIAGNOSTIC PROCEDURE
SYMPTOM: Sunload sensor circuit is open or shorted. (orA/C LEDis indicated on auto amp. as a result of conducting
Self-diagnosis STEP 2.)
CHECK SUNLOAD SENSOR CIRCUIT
BETWEEN SUNLOAD SENSOR AND
AUTO AMP.
Disconnect sunload sensor harness con-
nector.
Do approx. 5 volts exist between sunload
sensor harness terminal No.j
10and body
ground?
Ye s
cNo
Disconnect auto amp. har-
ness connector.
Note
Check circuit continuity
between sunload sensor
harness terminal No.j
10
and auto amp. harness
terminal No.j
10.
OK
Disconnect auto amp. harness connector.
Replace auto amp.
Note
Check circuit continuity between sunload
sensor harness terminal No.j
24and auto
amp. harness terminal No.j
24.
OK
CHECK SUNLOAD SENSOR.
(Refer to HA-109.)
OK
cNG
Replace sunload sensor.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
RHA061GC
RHA680G
RHA681G
RHA683G
.
..
.
.
.
TROUBLE DIAGNOSESAUTO
Sunload Sensor (Cont'd)
HA-108
COMPONENT INSPECTION
Sunload sensor
Measure voltage between auto amp. terminalj10and body ground.
+When checking sunload sensor, select a place where sun
shines directly on it.
RHA684G
SHA930E
TROUBLE DIAGNOSESAUTO
Sunload Sensor (Cont'd)
HA-109
Intake Sensor
COMPONENT DESCRIPTION
The intake sensor is located on the cooling unit. It converts tem-
perature of air after it passes through the evaporator into a resis-
tance value. The value is then input to the auto ampli®er.
DIAGNOSTIC PROCEDURE
SYMPTOM: Intake sensor circuit is open or shorted.
CHECK INTAKE SENSOR CIRCUIT
BETWEEN INTAKE SENSOR AND AUTO
AMP.
Disconnect intake sensor harness connec-
tor.
Do approx. 5 volts exist between intake
sensor harness terminal No.j
25and body
ground?
Ye s
cNo
Disconnect auto amp. har-
ness connector.
Note
Check circuit continuity
between intake sensor har-
ness terminal No.j
25and
auto amp. harness terminal
No.j
25.
Continuity should exist.
If OK, check harness for
short.
OK
Disconnect auto amp. harness connector.
Replace auto amp.
Note
Check circuit continuity between intake
sensor harness terminal No.j
24and auto
amp. harness terminal No.j24.
Continuity should exist.
If OK, check harness for short.
OK
CHECK INTAKE SENSOR.
(Refer to HA-111.)
OK
cNG
Replace intake sensor.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
RHA685G
RHA957FA
RHA686G
RHA687G
RHA688G
.
..
.
.
.
TROUBLE DIAGNOSESAUTO
HA-110
COMPONENT INSPECTION
Intake sensor
After disconnecting intake sensor harness connector, measure
resistance between terminalsj
25andj24at sensor harness side,
using the table below.
Temperature ÉC (ÉF) Resistance kW
þ20 (þ4) 16.2
þ10 (14) 9.8
0 (32) 6.0
10 (50) 3.94
20 (68) 2.64
25 (77) 2.12
30 (86) 1.82
40 (104) 1.27
RHA689G
TROUBLE DIAGNOSESAUTO
Intake Sensor (Cont'd)
HA-111
Checking Refrigerant Leaks
PRELIMINARY CHECK
Perform a visual inspection of all refrigeration parts, ®ttings, hoses,
and components for signs of A/C lubricant leakage, damage and
corrosion.
PRECAUTIONS FOR HANDLING LEAK DETECTOR
When performing a refrigerant leak check, use an A/C leak detec-
tor or equivalent. Ensure that the instrument is calibrated and set
properly per the operating instructions.
The leak detector is a delicate device. In order to use the leak
detector properly, read the operating instructions and perform any
speci®ed maintenance.
Other gases in the work area or substances on the A/C
components, for example, anti-freeze, windshield washer
¯uid, solvents and cleaners, may falsely trigger the leak detec-
tor. Make sure the surfaces to be checked are clean. Do not
allow the sensor tip of the detector to come into contact with
any substance. This can also cause false readings and may
damage the detector.
1. Position probe approximately 5 mm (3/16 in) away from point
to be checked.
2. When testing, circle each ®tting completely with probe.
SHA705EB
SHA707EA
SHA706E
SERVICE PROCEDURESMANUAL AND AUTO
HA-119
