1995 TOYOTA SUPRA Service Repair Manual

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Page 17 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Warning for A/C compressor lock
If compressor lock occurs during air conditioning operation,
the [A/C] switch indicator on the air conditioning control as-
sembly starts blinking.
When this occurs, ch

Page 18 of 2543

TOYOTA SUPRA 1995 Service Repair Manual INDICATOR CHECK
1. Turn the ignition switch on while pressing the air conditioning
control AUTO switch and R/F SW simultaneously.
2. Check that all the indicators light up and go off at 1
second inte

Page 19 of 2543

TOYOTA SUPRA 1995 Service Repair Manual ±MEMO±
± AIR CONDITIONING SYSTEMTROUBLESHOOTINGAC±19

Page 20 of 2543

TOYOTA SUPRA 1995 Service Repair Manual SENSOR CHECK TROUBLE CODE CHART
If a LED is blinking during the diagnostic sensor check, check the circuit listed for the code in the table below
(Proceed to the page given for that circuit.)

SENSOR CHECK TROUBLE CODE CHART
If a LED is blinking during the diagnostic sensor check, check the circuit listed for the code in the table below
(Proceed to the page given for that circuit.)

No.

Blinking LED

Detecting Condition
0 L±AUTO Normal
1 L±FACE*1 Open or short in room temperature sensor circuit.
2 L±B/L Open or short in ambient temperature sensor circuit.
3 L±FOOT Open or short in evaporator temperature sensor circuit.
4 L±F/D*2 Open or short in engine coolant temperature sensor circuit.

5

L DEF*3 Open in solar sensor circuit.
5 L±DEF*3 Short in solar sensor circuit.

6

L±A/C*4

All conditions below are detected for 3 secs. or more.
(a) Engine speed 450 rpm or more.
(b) Ratio between engine and compressor rpm deviates 20% or more in comparison to normal operation.

7

L±FRS

Open in pressure sensor circuit.
Abnormal refrigerant pressure [ below 196 kPa (2.0 kgf/cm2, 28 psi)
over 3,140 kPa (32.0 kgf/cm2, 455 psi) ]
8

L±REC

Short to ground or power source circuit in air mix damper position sensor circuit.
9 L±LO Short to ground or power source circuit in air outlet damper position sensor circuit.
10 L±M2 Air mix damper position sensor value does not change even if A/C amplifier signals the
air mix damper control servo motor to operate.

11

L±HI

Air outlet damper position sensor value does not change even if A/C amplifier signals the
air outlet damper control servo motor to operate.
HINT: *1If the room temp. is approx. ±20°C (±4°F) or lower, FACE light may blink even though the
system is normal.
*
2If the ambient temperature is approx. ±50°C (±58°F) or lower, the B/L light may blink even
though the system is normal.
*
3If the check is being performed in a dark place, the LED for DEF (solar sensor circuit abnormal)
could be blinking.
In this case, perform diagnostic sensor check again while shining a light, such as an inspection
light, on the solar sensor.
If the light is still blinking, there could be trouble in the solar sensor circuit. AC±20
± AIR CONDITIONING SYSTEMTROUBLESHOOTING

Page 21 of 2543

TOYOTA SUPRA 1995 Service Repair Manual AC±28
AC±30
AC±32
AC±34
AC±36
AC±38
AC±40
AC±42
AC±48
AC±42
AC±44
AC±48
AC±50
Trouble AreaMemory*5See page
(8.5 min. or more)
(8.5 min. or more)
(8.5 min. or more)
(8.5 min. or more)
(8.5

AC±28
AC±30
AC±32
AC±34
AC±36
AC±38
AC±40
AC±42
AC±48
AC±42
AC±44
AC±48
AC±50
Trouble AreaMemory*5See page
(8.5 min. or more)
(8.5 min. or more)
(8.5 min. or more)
(8.5 min. or more)
(8.5 min. or more)
(1 min. or more)
(1 min. or more)
(15 secs. or more)
(15 secs. or more)
Room temp. sensorHarness or connector between room temp. sensor and A/C amplifier
A/C amplifier
Ambient temp. sensorHarness or connector between ambient temp. sensor and A/C amplifier
A/C amplifier
Evaporator temp. sensorHarness or connector between evaporator temp. sensor and A/C amplifier
A/C amplifier
Engine coolant temp. sensorHarness or connector between coolant temp. sensor and A/C amplifier
A/C amplifier
Solar sensorHarness or connector between sensor and A/C amplifier
A/C amplifier
Compressor drive beltCompressor lock sensorCompressorHarness and connector between A/C amplifier and compressor, compressor
lock sensor
A/C amplifier
Pressure switchHarness or connector between pressure switch and A/C amplifier
Refrigerant pipe lineA/C amplifier
Air mix damper position sensor A/C amplifierHarness or connector between air mix damper position sensor and A/C amplifier
Air outlet damper position sensor A/C amplifierHarness or connector between max cool damper position sensor and A/C amplifi-
er
Air mix damper control servo motorAir mix damper position sensorHarness and connector between A/C amplifier and air mix position sensor
Harness and connector between A/C amplifier and air mix damper controlservo motorA/C amplifier
Air outlet damper control servo motor Air outlet damper position sensorHarness and connector between A/C amplifier and air outlet position sensor
Harness and connector between A/C amplifier and air outlet damper motorA/C amplifier
HINT: *4Compressor lock (A/C light blink) is indicated only for a current malfunction. (See page AC±38)
To confirm the trouble indication, perform the following steps.
(1) With the engine ON, enter the trouble code check mode.
(2) Press the R/F switch to enter actuator check mode, and set the operation to Step No. 3.
(3) Press the AUTO switch to return to diagnostic sensor check mode.
(4) The A/C light starts to blink after approx. 3 secs.
*
5The A/C amplifier memorizes the trouble code of the respective malfunction when it occurs
for period of time indicated in the brackets.
± AIR CONDITIONING SYSTEMTROUBLESHOOTINGAC±21

Page 22 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Step No.
Conditions
Blower
MotorAir Flow
ventAir Inlet
damper
Set
Temperature
°C (°F)
Magnetic
clutchAir mix
damper
ACTUATOR CHECK
1. After entering the sensor check mode, press the R/F switch.

Page 23 of 2543

TOYOTA SUPRA 1995 Service Repair Manual ConditionStandard ValueSymbolTerminal
No.Tester
ConnectionWiring
Color
A C AMPLIFIER TERMINAL STANDARD VALUE
± AIR CONDITIONING SYSTEMTROUBLESHOOTINGAC±23

Page 24 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Terminal
No.SymbolTester
ConnectionWiring
ColorConditionStandard Value
* After 15 minutes, ON mode will change to OFF mode automatically. AC±24
± AIR CONDITIONING SYSTEMTROUBLESHOOTING

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