1986 TOYOTA SUPRA Service Repair Manual

229
5. AIR CONDITIONING OPERATION
THE A/C AMPLIFIER RECEIVES VARIOUS SIGNALS, I.E., THE ENGINE RPM FROM THE IGNITER, OUTLET TEMPERATURE SIGNAL
FROM THE A/C THERMISTOR, COOLANT TEMPERATURE FROM THE ENGINE COOLANT TEMP. SENSOR (EFI WATER TEMP. SENSOR)
AND THE LOCK SIGNAL FROM THE A/C COMPRESSOR, ETC.
WHEN THE ENGINE IS STARTED AND THE A/C SW (HEATER CONTROL SW) IS ON, A SIGNAL IS INPUT TO THE A/C AMPLIFIER. AS A
RESULT, THE GROUND CIRCUIT IN A/C AMPLIFIER IS CLOSED AND CURRENT FLOWS FROM HTR FUSE TO TERMINAL 1 OF A/C
MAGNETIC CLUTCH RELAY " TERMINAL 2 " TERMINAL ACMG OF ENGINE CONTROL MODULE (ENGINE ECU) " TERMINAL A/C "
TERMINAL MGC OF A/C AMPLIFIER " TERMINAL GND " GROUND, TURNING THE RELAY ON, SO THAT THE A/C MAGNETIC CLUTCH
IS ON AND THE A/C AMPLIFIER OPERATES.
AT THE SAME TIME, THE ENGINE CONTROL MODULE (ENGINE ECU) DETECTS THE MAGNETIC CLUTCH IS ON AND THE A/C
AMPLIFIER IS OPERATING AND OPENS DIRECTION TO AVOID LOWERING THE ENGINE RPM DURING A/C OPERATING.
WHEN ANY OF THE FOLLOWING SIGNALS ARE INPUT TO THE A/C AMPLIFIER, THE A/C AMPLIFIER OPERATES TO TURN OFF THE
AIR CONDITIONING.
*ENGINE RPM SIGNAL IS HIGH.
*COOLANT TEMP. SIGNAL IS HIGH.
*A SIGNAL THAT THE TEMPERATURE AT THE AIR OUTLET IS LOW.
*A SIGNAL THAT THERE IS A LARGE DIFFERENCE BETWEEN ENGINE SPEED AND COMPRESSOR SPEED.
*A SIGNAL THAT THE REFRIGERANT PRESSURE IS ABNORMALLY HIGH OR LOW.

230
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
7. 5A
HTR
E9
E9
E3E3
E2 2
1A 51K22
22 22265 12
3
52 31
23 41531 42
22 22
1 2 4
M
1 2
M
1 2
M 21 IK 1 3IK12EA1 1
IK1 1 IB 4 1
IF15
IF313 IB23
EB IGEB A 2A3
B 2B1A1 FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
R±L
R±L
R±L
R±L
R±LR±L
W±G
L±W
L
L
II1 10
LL L±W
L L±W
LW±B W±B
R±L B
R±L R±L L±R
L±W W±B
L±R L±R
L B
BR
W±B W±B
L
R±L
L±B
L±BL±B
L±BL±BL
W±B W±B W±B
W±B
W±BW±BL±R W±R LL
W±G
R±L 22 11
(
*1) (
*1)
(
*1)
50A
HTR30A
FAN
RADIATOR FAN
RELAY NO. 2
RADIATOR FAN
RELAY NO. 1
HEATER
RELAY
A/C MAGNETIC
CLUTCH RELAY
A/C SINGLE
PRESSURE SW A/C MAGNETIC
CLUTCH A4
ENGINE COOLANT
TEMP. SW
(
WATER TEMP. SW) E5
RADIATOR
FAN MOTOR R1
A/C CONDENSER
FAN MOTOR A2
B3
BLOWER MOTOR +B SI
M+ M± GNDBLOWER MOTOR
CONTROL RELAYB B4 ,B5AE9:*1
E20 : * 2
E11 : * 1
E26 : * 2R2
R3
A 3
A 2
A3A
EA E5
W±B

231
*
1:2JZ±GTE
*2 : 2JZ±GE
A AI15
B 9B13 C7B15 B6C21 B 16II1 31 II129
IHEA1 2 R±L
W± G
L±W
L
LW±B
R±L
B±W
W±G
L±R
B±W B±WL±R L±WL L W±B
W±B W±B
W±B W±B W±B
W±G23 34 16
4
A(
*2) ENGINE CONTROL MODULE
(
ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION ECU) E10
IGNITER I4
JUNCTION
CONNECTOR J1A/C AMPLIFIERA A12 , A13C GND VER1 A/C±IN BLW HR MGC IGNEXT
(
*
1)
B ,A14 ACMG A/C TACO

232
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
IG1 16 IG113 IG115 IG114 IF1 10
I15
I15
B 8B19 B20 B17 C16 C4C10 C11 C1C2 A 1A6A18 A5B6B3B4 MA 9 W±B
R±L
R±L
R±L
R±L
G±R
G
GR G±R
G
GRR±L R±L R±L
R±L
V
R±Y
BR
Y
BR±W
GW±B
2 534
R±L
IG AIR AIF AIM/AMOUT L±RDEF L±DEF L±F/D L±FOOT L±B/L L±FACEAIR INLET CONTROL SERVO MOTOR A2 4HEATER CONTROL SWB H12 , H13A
A/C AMPLIFIERA A12 , A13CRR±
DEFOG DEF F/D FOOT B/L FACE
RECIRC
FRESH
B ,A14

233
*
1:2JZ±GTE
*2 : 2JZ±GE
C 6C17 C18 C19 C12 C15 C14 C3C13 B1B4B3B2A8A10 4 A9B11 B 12 B11 A7A15 3 A4A14 A17 A12 A16 B1B10 B9A13 B2B7A11 A2A10
I12
R±B
LG±B
GR
B
LG
P
B±W
P±B
R
LG±R
W±L
R±W
G±W
L±R
Y±B
P±B
V±W
L±B
BR±W V±W
BR±W
V±W A
A
L±MAUTO L±REC L±FRS L±A/C L±HI L±M3 L±M2 L±M1 L±L0 SW7 SW6 SW5 SW4 SW3 SW2 SW1 SG TSET
A/C AMPLIFIERA A12 , A13C AUTOREC/
FRS A/C FAND±FAND+ OFF
WARM COOL HEATER CONTROL SWB H12 , H13A
B ,A14

234
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
I12 I12I13
I13 I13 I13
I19 I14 I12 2 1
2 1
2 1 2 1
2 1 IB6 11 IB63 II120
II1 26 IF3 7IF38
IG1 6IG13IG17IG11 IG1 11 IG1 4IG15 2 1M
A 2A17 A5A6C22 B10 A7C8C9 A 16BR±W
V±W V±W BR±W
V±W BR±W BR±W
BR±W
V±W V±W V±W V±W
BR±W
Y±G
Y±L V±W BR±W
V±W
V±W
P±B
V±W
V±W
LG
V±W L±Y
Y± L
WV±W LG±R LG ±R
W Y±L L±YLG G±Y G±YP±BY± L Y±G BR±W
V±W P±B
V±W
V±W
G±YG±Y V±W
V±W
LG
BR±W
Y±L
W
534 2 1
P±B
V±W
S5 TS TR TAM LOCK±IN TPO TE AOD AOFTW
A/C ROOM
TEMP. SENSOR A16 A/C SOLAR SENSOR A17
A/C AMBIENT
TEMP. SENSOR A1
A/C LOCK SENSOR
[A/C MAGNETIC CLUTCH] A4
AIR VENT MODE
CONTROL SERVO MOTOR A26
A/C EVAPORATOR
TEMP. SENSOR A15
ENGINE COOLANT
TEMP. SENSOR
(
WATER TEMP. SENSOR)
(
FOR A/C SYSTEM) E11
A/C AMPLIFIERA A12 , A13CDEF
FACE
V±W
B ,A14

235
*
2:2JZ±GE *1 : 2JZ±GTE
10A
ECU±B15A
CIG10A
GAUGE
1E 13 1E21H12
44 52 3144I14 I14
I14
IG1 8IG19IG12IF18IF36II1 8 II123 M
A 18 A3A1B7C20 B18 A11 A14 1E12
II12
IB6 12
EA FROM POWER SOURCESYSTEM(
SEE PAGE 56)
V±WY Y
Y
L±R L±R
L±Y
W±R
L±R
Y
Y
Y
Y R
Y L±R Y BR ±W
G± W
V±W
V
R±Y G±W
V
R±Y G± W
V
R±Y
W± R
L±R
B
P
L±Y L±YP
L±R
W± B
4352 1
65 3 121
W± L B
TP AMH AMC +B ACC RDEFGR SPEED PSW AIR MIX CONTROL
SERVO MOTOR
SPEEDOMETER
[COMB. METER]
A2 5
TELL TALE L IGHT RH T6
VEHICLE SPEED SENSOR
(
SPEED SENSOR)
NO. 1
(
FOR COMBI NATION METER) V10 A/C DUAL PRESSURE SW
OD O AND
TRI P
A/C AMPLIFIERA A12 , A1 3C WARM
COOL
B
REAR WINDOW
DEFOGGER RELAY
IF A 9
A 11 B11A 10
A 4
B 1B 2A 1
(
*1) (
*1)
(
*2)
(
*2)
B A3 ,AB C10 , C12A
B ,A14
BRBR
R

236
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
A 4 A/C MAGNETIC CLUTCH4 ± GROUND: APPROX. 3.7

A 3(A) A/C DUAL PRESSURE SW [A/C TRIPLE PRESSURE SW] (2JZ±GTE)(A) 1±(A) 4 : OPEN ABOVE APPROX. 225 KPA (33 PSI, 2.3 KG/CM2) OR 3140 KPA (458 PSI, 32 KG/CM2)
A 3(B) A/C DUAL PRESSURE SW (2JZ±GE)(B) 1±(B) 2 : OPEN ABOVE APPROX. 225 KPA (33 PSI, 2.3 KG/CM2) OR 3140 KPA (458 PSI, 32 KG/CM2)
A12(C), A13(A), A14(B) A/C AMPLIFIER+B ± GROUND: ALWAYS APPROX. 10±14 VOLTS
IG ± GROUND: APPROX. 10±14 VOLTS WITH IGNITION SW AT ON POSITION
HR ± GROUND: APPROX. 10±14 VOLTS WITH IGNITION SW AT ON POSITION AND DO NOT TURN THE BLOWER MOTOR
BELOW 1 VOLTS WITH IGNITION SW AT ON POSITION AND TURN THE BLOWER MOTOR
ACC ± GROUND: APPROX. 10±14 VOLTS WITH IGNITION SW AT ACC OR ON POSITION
TW ± GROUND:10±14 VOLTS AT START THE ENGINE AND MAX. COLD POSITION OF A/C TEMP. CONTROL SW
BELOW 1 VOLTS AT START THE ENGINE AND MAX. WARM POSITION OF A/C TEMP. CONTROL SW
MGC ± GROUND: BELOW 1 VOLTS AT START THE ENGINE, PUSH THE A/C AUTO SW AND A/C SW ON POSITION
10±14 VOLTS AT START THE ENGINE, PUSH THE A/C AUTO SW AND A/C SW OFF POSITION
BLW ± GROUND:1.0±3.0 VOLTS WITH THE IGNITION SW ON AND TURN THE BLOWER MOTOR
S5 ± GROUND:4±6 VOLTS WITH THE IGNITION SW ON
SG ± GROUND: ALWAYS CONTINUOUS
AMH ± AMC13±19 VOLTS WITH IGNITION SW OFF
AOF ± GROUND: APPROX. 12 VOLTS WITH FACE SW ON
AOD ± GROUND: APPROX. 12 VOLTS WITH DEF SW ON
GND ± GROUND: ALWAYS CONTINUOUS
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A124 (2JZ±GTE)A1728H12A29A 126 (2JZ±GE)A2428H13B29
A 224A2528I 427
A3A24 (2JZ±GTE)A2628J 129A 3B26 (2JZ±GE)B 328R 125
A424 (2JZ±GTE)B 4A28R 225A 426 (2JZ±GE)B 5B28R 325
A12C28C10A28T 629
A13A28C12B28V1025 (2JZ±GTE)
A14B28E 524V1027 (2JZ±GE)
A1528E1029
A1628E1129
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
222R/B NO. 2 (ENGINE COMPARTMENT LEFT)
423R/B NO. 4 (LEFT KICK PANEL)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A20ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1E20INSTRUMENT PANEL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1H20COWL WIRE AND J/B NO 1 (LEFT KICK PANEL)1K20COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EA132 (2JZ±GTE)ENGINE WIRE AND ENGINE ROOM MAIN WIRE (NEAR THE R/B NO 2)EA134 (2JZ±GE)ENGINE WIRE AND ENGINE ROOM MAIN WIRE (NEAR THE R/B NO. 2)
IB236ENGINE ROOM MAIN WIRE AND COWL WIRE (LEFT KICK PANEL)
IB436ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)IB636ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)
IF136INSTRUMENT PANEL WIRE AND COWL WIRE (INSTRUMENT PANEL REINFORCEMENT LH)
IF336INSTRUMENT PANEL WIRE AND COWL WIRE (RIGHT KICK PANEL)
IG138INSTRUMENT PANEL WIRE AND COWL NO. 3 WIRE (BEHIND HEATER CONTROL SW)
II138ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
IK138COWL NO. 4 WIRE AND COWL WIRE (RIGHT KICK PANEL)
SERVICE HINTS