Acura RL (1996-2004 year). Manual — part 590
Troubleshooting
Symptom Chart
For electrical malfunctions which are indicated by the self-diagnostic system, refer to self-diagnosis function (see next
page).
NOTE:
Check the engine coolant level, and allow the engine to warm up before troubleshooting.
Any abnormality must be corrected before continuing the test.
Because of the precise measurements needed, use a multimeter when testing.
Before performing any troubleshooting procedures check:
— Fuses No. 37 (40 A), No. 47 (20 A), No. 50 (20 A), No. 56 (7.5 A) in the under-hood fuse/relay box, and No. 3 (7.5 A), No.
5 (20 A) in the under-dash fuse/relay box
— Grounds No. G201, G301, G302, G401, G402, G404
— Cleanliness and tightness of all connectors
Symptom
Recirculation control doors do not change between FRESH and RECIRCULATE.
The blower motor does not run immediately even though the engine is fully warmed
up. (NOTE: The temperature control dial must be set between 61 °F [18°C] and 89°F
[32°C].)
No heater and A/C in either manual or AUTO modes.
Both fans do not run for engine cooling (but they both run with the A/C on).
Both fans always run at high speed for engine cooling.
Both fans always run at high speed with the A/C on.
Radiator fan does not run at high speed (but condenser fan runs at high speed, and
both fans run at low speed).
Condenser fan does not run at high speed (but radiator fan runs at high speed, and
both fans run at low speed).
Both fans do not run at low speed, and radiator fan does not run at high speed (but
condenser fan runs at high speed).
Both fans do not run at low speed, and condenser fan does not run at high speed
(but radiator fan runs at high speed).
Both fans do not run at low speed (but both fans run at high speed).
Both fans do not run at high speed (but both fans run at low speed).
Compressor clutch does not engage.
Both fans and compressor do not work at all.
See page
Main Menu
Table of Contents
Troubleshooting
Self-diagnosis Function
The climate control unit has a self-diagnosis function.
Running the Self-diagnosis Function
Turn the ignition switch ON (II), and after 1 minute, press both the AUTO and OFF buttons at the same time. While the but-
tons are pressed, indicator lights A, B, C, D, E, F and G respectively will come on to indicate a faulty component.
A/C
AUTO BUTTON
OFF BUTTON
A
B
C
D
E
F
G
Indicator
A/C
ON
A/C ECON
OFF
Component with problem
In-car temperature sensor
Outside air temperature sensor
Sunlight sensor
Evaporator temperature sensor
Air mix control motor
Mode control motor
Blower motor
Possible cause
Open or short circuit, faulty sensor
Open or short circuit, faulty sensor
Open or short circuit, faulty sensor
Open or short circuit, faulty sensor
Open or short circuit, obstructed door,
faulty motor
Open or short circuit, obstructed door,
faulty motor
Open or short circuit, faulty motor
See page
NOTE: In case of multiple problems, the respective indicator lights will come on. If indicator lights A, B, C, D, E and F
come on at the same time, there may be an open in the common ground wire of the sensors.
Resetting the Self-diagnosis Function
Turning the ignition switch OFF will cancel the self-diagnosis function. After service work, run the self-diagnosis function
once again to check that there is no other problem.
Main Menu
Table of Contents
Climate Control Unit Input/Output Signals
8P CONNECTOR
CLIMATE CONTROL UNIT CONNECTORS
20P CONNECTOR
Wire side of female terminals
8P CONNECTOR
Terminal
No.
1
2
3
4
Wire Color
BLK/YEL
PNK/BLU
GRY
WHT/YEL
Signal
IG2 POWER
SENSOR GROUND
AIR MIX/MODE
POTENTIAL +5 V
BACK UP POWER
INPUT
INPUT
OUTPUT
INPUT
Terminal
No.
5
6
7
8
Wire Color
RED
RED/BLK
BLK
BLU/RED
Signal
DASH LIGHTS BRIGHT-
NESS CONTROLLER
No. 49 (7. 5 A) FUSE
GROUND
BLOWER FEEDBACK
OUTPUT
INPUT
OUTPUT
INPUT
20P CONNECTOR
Terminal
No.
1
2
3
4
5
6
7
9
10
Wire Color
ORN
BRN
BRN/WHT
BRN/BLK
BLU
LT GRN/RED
RED/YEL
RED
Signal
POWER TRANSISTOR
BASE
EVAPORATOR TEMPER-
ATURE SENSOR
OUTSIDE AIR TEMPER-
ATURE SENSOR
IN-CAR TEMPERATURE
SENSOR
MODE DEF
MODE VENT
AIR MIX HOT
AIR MIX COOL
OUTPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
Terminal
No.
11
12
14
15
16
17
18
19
20
Wire Color
LT GRN
LT GRN/BLK
PNK/BLK
WHT/RED
RED/WHT
GRN/RED
GRN/WHT
Signal
A/C PRESSURE SWITCH
BLOWER MOTOR
HIGH RELAY
MODE POTENTIAL
AIR MIX POTENTIAL
SUNLIGHT SENSOR
ENGINE COOLANT
TEMPERATURE (ECT)
SENSOR
RECIRCULATE
FRESH
INPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
Main Menu
Table of Contents
Troubleshooting
In-car Temperature Sensor
Self-diagnosis indicator light A comes on: A problem in the in-car temperature sensor circuit.
The in-car temperature sensor is a temperature dependent resistor (thermistor). The resistance of the thermistor decreas-
es as the temperature inside the vehicle increases.
Self-diagnosis circuit check indi-
cates a problem in the in-car
temperature sensor circuit.
Check the in-car temperature
sensor:
1. Remove the in-car temperature
), and
disconnect the 2P connector.
2. Measure the resistance
between the No. 1 and No. 2
terminals of the in-car tem-
perature sensor.
* Is the resistance within the spec-
ifications shown on the graph.
Check for a short in the wire:
1. Remove the climate control
), and dis-
connect the 8P and 20P con-
nectors.
2. Check for continuity between
the No. 6 terminal of the 20P
connector and body ground.
IN-CAR TEMPERATURE SENSOR
RESISTANCE
k
14 32 50 68 86 104°F
-10 0 10 20 30 40°C
CAUTION: The sensor uses a thermistor which
can be damaged if high current is applied during
testing. Therefore, use a circuit tester with an
output of 1 mA or less at the 20 k range.
* Check for change in resistance by
heating or cooling the sensor with a
hair drier, etc.
Replace the in-car temperature
sensor.
CLIMATE CONTROL UNIT 20P CONNECTOR
Wire side of female terminals
Is there continuity?
Repair short in the wire between
the climate control unit and the
in-car temperature sensor.
Main Menu
Table of Contents
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст