1986 TOYOTA SUPRA mirror

DTC 31 Volume Air Flow Meter Circuit
CIRCUIT DESCRIPTION
As shown in the figure at right, when a pillar (Vortex
generating body is placed in the path of a uniform
flow, vortices called Karman±Vortex are generated
downstream of the object. Using this principle, a
vortex generator is placed inside the volume air
flow meter. By measuring the frequency of the vor-
tices generated, the ECM can determine the vol-
ume of air flowing through the volume air flow me-
ter. The vortices are detected by their exerting
pressure on thin metal foil mirror) surfaces and a
light emitting element and light receptor (LED and
photo transistor) positioned opposite the mirror
which optically senses the vibrations in the mirror.
The ECM uses these signals mainly for calculation
of the basic injection volume and the basic ignition
advance angle.
DTC No.Diagnostic Trouble Code Detecting ConditionTrouble Area
All conditions below are detected:
(a) No volume air flow meter signal to ECM
for 2 sec. when engine speed is above
300 rpm
(b) Engine stall
Open or short in volume air flow meter
circuit

Volume air flow meter

ECM
if the ECM detects diagnostic trouble code ª31º, it operates the fail safe function, keeping the igni-
tion timing and fuel injection volume constant and making it possible to drive the vehicle. EG±438
± ENGINE2JZ±GE ENGINE TROUBLESHOOTING

 Heater 
 Micrometer 
 
 Mirror
 
 
 Magnetic finger 
 Piston ring compressor 
 
 Piston ring expander
 
 
 Plastigage 
 Precision straight edge 
 
 Spring tester
 
 Valve spring
 Steel square Valve spring
 Thermometer 
 
 Torque wrench 
 
 Valve seat cutter 
 Vernier calipers 
 
 V±block 
 
SSM (SERVICE SPECIAL MATERIALS)
 
 
 
08826±00080 
 
 
Seal Packing Black or equivalent
(FIPG) 
 
 
No.1 camshaft bearing cap
Cylinder head
Rear oil seal retainer
 
 
 
08833±00070 
 
 
Adhesive 1324,
THREE BOND 1324 or equivalent 
 
 
Drive plate bolt (A/T)
Union for oil cooler hose
(2JZ±GTE)
 
 
 
08833±00080 
 
 
Adhesive 1344,
THREE BOND 1344,
LOCTITE 242 or equivalent 
 
 
Idler pulley pivot bolt
Oil pressure switch
EG±6± ENGINEENGINE MECHANICAL

29
Position of Parts in Instrument Panel
E 8 Electronically Controlled Transmission Pattern O 5 O/D Main SW and A/T Indicator Light (for Shift
Select SW Lever)
E 9 Engine Control Module (Engine and Electronically
Controlled Transmission ECU) P 4 PPS ECU
E 10 Engine Control Module (Engine and Electronically P 5 Parking Brake SW
Controlled Transmission ECU)
E 11 Engine Coolant Temp. Sensor (Water Temp. Sensor) R 4 Radio and Player (w/o Stereo Power Amplifier)
(for A/C System) R 5 Radio and Player (w/o Stereo Power Amplifier)
R 6 Radio and Player (w/ Stereo Power Amplifier)
F 10 Front Tweeter (Speaker) LH R 7 Remote Control Mirror SW
F 11 Front Tweeter (Speaker) RH R 8Rheostat
G 3 Glove Box Light S 6 Seat Heater SW
G 4 Glove Box Light SW S 7 Shift Lock ECU
S 8 Stereo Power Amplifier
H 10 Hazard SW S 9 Stereo Power Amplifier
H 11 Heated Oxygen Sensor (Sub) S 10 Stereo Power Amplifier
H 12 Heater Control SW S 11 Stop Light SW
H 13 Heater Control SW S 16 Sub Heated Oxygen Sensor
(for California)
I 18 Ignition Key Cylinder Light
I 19 Ignition SW T 5 Telltale Light LH
I 20 Integration Relay T 6 Telltale Light RH
T 7 Theft Deterrent ECU
J 1 Junction Connector T 8 TRAC Off SW
J 2 Junction Connector T 9 Traction ECU
T 10 Traction ECU
K 3 Key Interlock Solenoid T 13 Theft Deterrent ECU
K 4 Kick Down SW
U 1 Unlock Warning SW
N 2 Noise Filter

30
ELECTRICAL WIRING ROUTING
Position of Parts in Body
A 31 ABS Speed Sensor Rear LH N 3 Noise Filter
A 32 ABS Speed Sensor Rear RH
A 33 Auto Antenna Motor P 6 Personal Light
P 7 Power Window Control SW RH
D 10 Door Courtesy SW LH P 8 Power Window Master SW and Door Lock Control
D 11 Door Courtesy SW RH SW LH
D 12 Door Key Lock and Unlock SW LH P 9 Power Window Motor LH
D 13 Door Key Lock and Unlock SW RH P 10 Power Window Motor RH
D 14 Door Lock Control SW RH
D 15 Door Lock Motor and Door Unlock Detection SW LH R 9 Rear Combination Light LH
D 16 Door Lock Motor and Door Unlock Detection SW RH R 10 Rear Combination Light RH
R 11 Rear Side Marker Light LH
F 12 Front Door Speaker LH R 12 Rear Side Marker Light RH
F 13 Front Door Speaker RH R 13 Rear Speaker LH
F 14 Fuel Pump and Sender R 14 Rear Speaker RH
F 15 Fuel Pump ECU R 15 Rear Wiper Motor and Relay
R 16 Remote Control Mirror and Mirror Heater LH
H 14 High Mounted Stop Light R 17 Remote Control Mirror and Mirror Heater RH
R 18 Rear Window Defogger (+)
L 1 License Plate Light R 19 Rear Window Defogger (±)
L 2 Light Failure Sensor
L 3 Luggage Compartment Key Unlock SW T 11 Tension Reducer Solenoid LH
L 4 Luggage Compartment Light T 12 Tension Reducer Solenoid RH
L 5 Luggage Compartment Light SW
W 2 Woofer (Speaker)

50
POWER SOURCE (Current Flow Chart)*1: (FOR CANADA)
*2: (FOR USA)
*Page Nos. of
Related Systems
Parts
Code or
Location
CB or FuseN3 208
Location
Noise Filter
* These are the page numbers of the first page on which the related system is shown.
The part indicated is located somewhere in the system, not necessarily on the page indicated here.


7.5A HTR
7.5A IGN
7.5A RAD No. 2
7.5A ST
7.5A TURN
10A ECU±B
10A ECU±IG
10A GAUGE
10A MIR±HTR
10A PANEL
10A TAIL
15A CIG
15A SEAT±HTR
15A STOP
20A WIPER
30A DEFOG
30A DOOR
7.5A ALT±S
7.5A DOME
7.5A DRL
7.5A TRAC
15A FOG
15A HAZ±HORN
15A HEAD (LH) *2
15A HEAD (LH±LWR) *1
15A HEAD (LH±UPR) *1
15A HEAD (RH) *2
15A HEAD (RH±LWR) *1
15A HEAD (RH±UPR) *1
20A RAD No. 1
30A ABS No. 2
30A EFI No. 1
30A EFI No. 2
30A FAN
50A HTR
50A MAIN
60A ABS No. 1
60A POWERO2 O5 P2 P4 P5 P6 P7 P8 P9 P10 P11 P12 R1 R2 R3 R4 R6 R7 R8 R9 220122
140
150
60
70
11 6
140
174 64
82
130
150
220
181159
164
220118 136 136 136 136 190 190 228 228 228122
210
218122 188 122 116
Oil Pressure SW
O/D Main SW
Park/Neutral Position SW
(Neutral Start SW), Back±Up
Light SW and A/T Indicator
Light SW (for A/T)
PPS ECU
Parking Brake SW
Personal Light
Power Window Control
SW RH
Power Window Master SW
and Door Lock Control SW LH
Power Window Motor LH
Power Window Motor RH
Power Seat Control SW
(for Driver's Seat)
Power Seat Motor
(for Driver's Seat Slide Control)
Radiator Fan Motor
Radiator Fan Relay No. 1
Radiator Fan Relay No. 2
Radio and Player
(w/o Stereo Power Amplifier)
Radio and Player
(w/ Stereo Power Amplifier)
Remote Control Mirror SW
Rheostat
Back±Up Light LH
[Rear Comb. Light LH]
[LOCATION](1): J/B No. 1 (See page 20)(2): R/B No. 2 (See page 19)(3): R/B No. 4 (See page 23)
20 22
23

51
R9 111
Rear Turn Signal Light LH
[Rear Comb. Light LH]
R10 R11 R12 R15 R16 R17 R18 S3 S6 S7 S8 S9 S11 S12 S13 S14 S15 S16 T1 T3 T4 T5 114 102 116 111 114 102 102 102 203188
208188
20820860
64122
192184210
214210
70
11 4
150
164 82
140
159
174
184192 192 192 192 82 130 164 164 159
Stop Light LH
[Rear Comb. Light LH]
Taillight LH
[Rear Comb. Light LH]
Back±Up Light RH
[Rear Comb. Light RH]
Rear Turn Signal Light RH
[Rear Comb. Light RH]
Stop Light RH
[Rear Comb. Light RH]
Taillight RH
[Rear Comb. Light RH]
Rear Side Marker Light LH
Rear Side Marker Light RH
Rear Wiper Motor and Relay
Remote Control Mirror and
Mirror Heater LH
Remote Control Mirror and
Mirror Heater RH
Rear Window Defogger (+)
Starter
Seat Heater SW
Shift Lock ECU
Stereo Power Amplifier
Stereo Power Amplifier
Stop Light SW
Seat Heater
(for Driver's Seat)
Seat Heater
(for Passenger's Seat)
Seat Heater Relay
(for Driver's Seat)
Seat Heater Relay
(for Passenger's Seat)
Sub Heated Oxygen Sensor
(for California)
Theft Deterrent Horn
Traction Brake Actuator
Traction Pump and Motor
ABS Indicator Light
[Telltale Light LH]
(4): R/B No. 5 (See page 20)
23

188
REMOTE CONTROL MIRROR
7. 5A
RAD NO. 2
IE1E 10
1J 11E 18
ID1 12 ID111 ID110 IL115 IL114 IL16
MMMM I5 B
M+ MVMH 534 4538
MLH MLV M+
217635EMRHMRV
MH MV M+LG±RBR±B
LG±R BR±B LG±B BR±YLG W±B W±B
LG
LG±B
LG±R
LG±R
BR±Y
BR±B LG
LG±B
LG±R
LG±R
BR±Y
BR±B W±B
GR
FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
OPERATION SW SELECT SW
RH RHLH LHUP LEFT
LEFT
UP RIGHT DOWN
RIGHT
DOWN REMOTE CONTROL MIRROR SW R7
REMOTE CONTROL MIRROR LH R16 R17
REMOTE CONTROL MIRROR RH

189
R 7 REMOTE CONTROL MIRROR SW
8±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ACC OR ON POSITION
5±2 : CONTINUOUS WITH OPERATION SW AT LEFT OR UP POSITION
8±5 : CONTINUOUS WITH OPERATION SW AT RIGHT OR DOWN POSITION
2±GROUND : ALWAYS CONTINUOUS
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
R 729R1630R1730
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1E20INSTRUMENT PANEL WIRE AND J/B NO.1 (LEFT KICK PANEL)
1J20COWL 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)
ID136FRONT DOOR LH WIRE AND INSTRUMENT PANEL WIRE (LEFT KICK PANEL)
IL138FRONT DOOR RH WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IE36LEFT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
I 538INSTRUMENT PANEL WIRE
12 3
X5 6 7 8
45 3453 R7 R16 R17
SERVICE HINTS