TOYOTA SUPRA 1995 Service Repair Manual

(a) Continuity Check with Ground
(1) Disconnect connectors (A) and (C) and measure the resistance between terminals 1 and 2 of connector
(A) and body ground.
In the case of Fig. 6,
Between terminal 1 of connector (A) and body ground " Continuity
Between terminal 2 of connector (A) and body ground " No continuity (open)
Therefore, it is found out that there is a short circuit between terminal 1 of connector (A) and terminal 1 of
connector (C).
(2) Disconnect connector (B) and measure the resistance between terminal 1 of connector (A) and body
ground, and terminal 1 of connector (B) and body ground.
Between terminal 1 of connector (A) and body ground " No continuity (open)
Between terminal 1 of connector (B) and body ground " Continuity
Therefore, it is found out that there is a short circuit between terminal 1 of connector (B) and terminal 1 of
connector (C).
IN±34± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS

Check and Replace ECU
First check the ECU ground circuit. If it is faulty, repair it. If it is nor-
mal, the ECU could be faulty, so replace the ECU with a known
good one and check if the symptoms appear.
(1) Measure the resistance between the ECU ground terminal
and the body body ground.
Resistance: 1
or less
(2) Disconnect the ECU connector, check the ground terminals
on the ECU side and wire harness side for bend and check
the contact pressure.
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMSIN±35

VEHICLE LIFT AND SUPPORT LOCATIONS
IN±36± INTRODUCTIONVEHICLE LIFT AND SUPPORT LOCATIONS

ABBREVIATIONS USED IN THIS
MANUAL
 ABS Anti±Lock Brake System
 ALR Automatic Locking Retractor
 APPROX. Approximately
 A/T, ATM Automatic Transmission
 AT F Automatic Transmission Fluid
 BTDC Before Top Dead Center
 CB Circuit Breaker
 CD Compact Disc CRS Child Restraint System DOHC Double Over Head Cam 
 DP
 
 Dash Pot
 ECU Electronic Control Unit
 ELR Emergency Locking Retractor
 ESA Electronic Spark Advance
 ETR Electronic Turning Radio
 EX Exhaust
 FIPG Formed in Place Gasket
 FL Fusible Link
 Fr Front H±Fuse High Current Fuse 
 IG 
 Ignition
 IN Intake
 JB Junction Block
 LED Light Emitting Diode
 LH Left±Hand
 LSD Limited Slip Differential
 Max. Maximum
 MP Multipurpose
 M/T Manual Transmission O/D Overdrive O/S Oversize 
 P & BV
 
 Proportioning and By±pass Valve
 PCV Positive Crankcase Ventilation
 PPS Progressive Power Steering
 PS Power Steering
± INTRODUCTIONABBREVIATIONS USED IN THIS MANUALIN±37

 RH Right±Hand
 SRS Supplemental Restraint System
 SSM Special Service Materials
 SST Special Service Tools
 STD Standard
 SW Switch TEMP. Temperature TRAC Traction Control System 
 U/S 
 Undersize
 VSV Vacuum Switching Valve
 w/ With
 w/o Without
IN±38± INTRODUCTIONABBREVIATIONS USED IN THIS MANUAL

GLOSSARY OF SAE AND TOYOTA TERMS
This glossary lists all SAE±J1930 terms and abbreviations used in this manual in compliance with SAE
recommendations, as well as their Toyota equivalents.
 
 
SAE ABBREVI±
ATIONS 
 SAE TERMS
 
 
TOYOTA TERMS
( ) ±± ABBREVIATIONS
 A/C Air Conditioning Air Conditioner
 ACL Air Cleaner Air Cleaner
AIRSecondary Air InjectionAir Injection (AI) AP Accelerator Pedal ± B+ Battery Positive Voltage +B, Battery Voltage BARO Barometric Pressure ±
 CAC Charge Air Cooler Intercooler
 CARB Carburetor Carburetor
 CFI Continuous Fuel Injection ±
 CKP Crankshaft Position Crank Angle
CLClosed LoopClosed Loop CMP Camshaft Position Cam Angle CPP Clutch Pedal Position ±
 CTOX Continuous Trap Oxidizer ±
 CTP Closed Throttle Position Idle ON (IDL ON)
 DFI Direct Fuel Injection (Diesel) Direct Injection (DI)
 DI Distributor Ignition ±
 
 
DLC1
DLC2
DLC3 
 
Data Link Connector 1
Data Link Connector 2
Data Link Connector 3 
 
1: Check Connector
2: Toyota Diagnosis Comunication Link (TDCL)
3: OBD II Diagnostic Connector
 DTC Diagnostic Trouble Code Diagnostic Code
 DTM Diagnostic Test Mode ±
 ECL Engine Control Level ±
 ECM Engine Control Module Engine ECU (Electronic Control Unit)
 ECT Engine Coolant Temperature Coolant Temperature, Water Temperature
(THW)
 
 
 
 
EEPROM
 
 
 
 
Electrically Erasable Programmable Read Only
Memory
 
 
 
 
Electrically Erasable Programmable Read Only
Memory (EEPROM),
Erasable Programmable Read Only Memory
(EPROM)
 
 
EFE 
 
Early Fuel Evaporation 
 
Cold Mixture Heater (CMH), Heat Control Valve
(HCV)
EGRExhaust Gas RecirculationExhaust Gas Recirculation (EGR) EI Electronic Ignition Toyota Distributorless Ignition (TDI) EM Engine Modification Engine Modification (EM) EPROM Erasable Programmable Read Only Memory Programmable Read Only Memory (PROM)
 EVAP Evaporative Emission Evaporative Emission Control (EVAP)
 FC Fan Control ±
 FEEPROM Flash Electrically Erasable Programmable
Read Only Memory ±
 
 FEPROM
 
 Flash Erasable Programmable Read Only
Memory 
 ±
 FF Flexible Fuel ±
 FP Fuel Pump Fuel Pump
 GEN Generator Alternator
 GND Ground Ground (GND)
HO2SHeated Oxygen SensorHeated Oxygen Sensor (HO2S)
± INTRODUCTIONGLOSSARY OF SAE AND TOYOTA TERMSIN±39

 IAC Idle Air Control Idle Speed Control (ISC)
IATIntake Air TemperatureIntake or Inlet Air Temperature ICM Ignition Control Module ± IFI Indirect Fuel Injection Indirect Injection IFS Inertia Fuel±Shutoff ±
 ISC Idle Speed Control ±
 KS Knock Sensor Knock Sensor
 MAF Mass Air Flow Air Flow Meter
 MAP Manifold Absolute Pressure Manifold Pressure
Intake Vacuum
 
 
 
MC
 
 
 
Mixture Control
 
 
 
Electric Bleed Air Control Valve (EBCV)
Mixture Control Valve (MCV)
Electric Air Control Valve (EACV)
 MDP Manifold Differential Pressure ±
 MFI Multiport Fuel Injection Electronic Fuel Injection (EFI)
MILMalfunction Indicator LampCheck Engine Light MST Manifold Surface Temperature ± MVZ Manifold Vacuum Zone ± NVRAM Non±Volatile Random Access Memory ±
 O2S Oxygen Sensor Oxygen Sensor, O2 Sensor (O2S)
 OBD On±Board Diagnostic On±Board Diagnostic (OBD)
 OC Oxidation Catalytic Converter Oxidation Catalyst Converter (OC), CCo
OPOpen LoopOpen Loop PAIR Pulsed Secondary Air Injection Air Suction (AS) PCM Powertrain Control Module ± PNP Park/Neutral Position ±
 PROM Programmable Read Only Memory ±
 PSP Power Steering Pressure ±
 
 
PTOX 
 
Periodic Trap Oxidizer 
 
Diesel Particulate Filter (DPF)
Diesel Particulate Trap (DPT)
RAMRandom Access MemoryRandom Access Memory (RAM) RM Relay Module ± ROM Read Only Memory Read Only Memory (ROM) RPM Engine Speed Engine Speed
 SC Supercharger Supercharger
 SCB Supercharger Bypass ±
 SFI Sequential Multiport Fuel Injection Electronic Fuel Injection (EFI), Sequential Injec-
tion
 SPL Smoke Puff Limiter ± SRI Service Reminder Indicator ± SRT System Readiness Test ±
 ST Scan Tool ±
 TB Throttle Body Throttle Body
 TBI Throttle Body Fuel Injection Single Point Injection
Central Fuel Injection (Ci)
 TC Turbocharger Turbocharger TCC Torque Converter Clutch Torque Converter TCM Transmission Control Module Transmission ECU (Electronic Control Unit)
 TP Throttle Position Throttle Position
 TR Transmission Range ±
IN±40± INTRODUCTIONGLOSSARY OF SAE AND TOYOTA TERMS

 
 
TVV 
 
Thermal Vacuum Valve 
 
Bimetallic Vacuum Switching Valve (BVSV)
Thermostatic Vacuum Switching Valve (TVSV)
 TWC Three±Way Catalytic Converter Three±Way Catalytic (TWC)
CC
RO 
TWC+OC
 
Three±Way + Oxidation Catalytic Converter
 
CCR + CCo 
VA F
 
Volume Air Flow
 
Air Flow Meter 
VR
 
Voltage Regulator
 
Voltage Regulator 
VSS
 
Vehicle Speed Sensor
 
Vehicle Speed Sensor (Read Switch Type) 
WOT
 
Wide Open Throttle
 
Full Throttle 
WU±OC
 
Warm Up Oxidation Catalytic Converter
 
± 
WU±TWC
 
Warm Up Three±Way Catalytic Converter
 
Manifold Converter 
3GR
 
Third Gear
 
± 
4GR
 
Fourth Gear
 
±
± INTRODUCTIONGLOSSARY OF SAE AND TOYOTA TERMSIN±41

STANDARD BOLT TORQUE SPECIFICATIONS
HOW TO DETERMINE BOLT STRENGTH
Hexagon
head bolt
Hexagon
flange bolt
w/ washer
hexagon bolt
Hexagon
head bolt
IN±42± INTRODUCTIONSTANDARD BOLT TORQUE SPECIFICATIONS

SPECIFIED TORQUE FOR STANDARD BOLTS
  Diameter  Specified torque
 Class Diameter
Mm Pitch mm Hexagon head bolt Hexagon flange bolt
  Mm  NVm kgfVcm ftVlbf NVm kgfVcm ftVlbf
 
 
 
 
 
4T
 
 
 
 
 
6
8
10
12
14
16 
 
 
 
 
1
1.25
1.25
1.25
1.5
1.5 
 
 
 
 
5
12.5
26
47
74
11 5 
 
 
 
 
55
130
260
480
760
1,150 
 
 
 
 
48 in.Vlbf
9
19
35
55
83 
 
 
 
 
6
14
29
53
84
± 
 
 
 
 
60
145
290
540
850
± 
 
 
 
 
52 in.Vlbf
10
21
39
61
±
 
 
 
 
 
 
5T
 
 
 
 
 
 
6
8
10
12
14
16 
 
 
 
 
 
1
1.25
1.25
1.25
1.5
1.5 
 
 
 
 
 
6.5
15.5
32
59
91
140 
 
 
 
 
 
65
160
330
600
930
1,400 
 
 
 
 
 
56 in.Vlbf
12
24
43
67
101 
 
 
 
 
 
7.5
17.5
36
65
100
± 
 
 
 
 
 
75
175
360
670
1,050
± 
 
 
 
 
 
65 in.Vlbf
13
26
48
76
±
 
 
 
 
 
6T
 
 
 
 
 
6
8
10
12
14
16 
 
 
 
 
1
1.25
1.25
1.25
1.5
1.5 
 
 
 
 
8
19
39
71
11 0
170 
 
 
 
 
80
195
400
730
1,100
1,750 
 
 
 
 
69 in.Vlbf
14
29
53
80
127 
 
 
 
 
9
21
44
80
125
± 
 
 
 
 
90
210
440
810
1,250
± 
 
 
 
 
78 in.Vlbf
15
32
59
90
±
 
 
 
 
 
 
7T
 
 
 
 
 
 
6
8
10
12
14
16 
 
 
 
 
 
1
1.25
1.25
1.25
1.5
1.5 
 
 
 
 
 
10.5
25
52
95
145
230 
 
 
 
 
 
11 0
260
530
970
1,500
2,300 
 
 
 
 
 
8
19
38
70
108
166 
 
 
 
 
 
12
28
58
105
165
± 
 
 
 
 
 
120
290
590
1,050
1,700
± 
 
 
 
 
 
9
21
43
76
123
±
 
 8T
 
 
8
10
12 
 
1.25
1.25
1.25 
 
29
61
11 0 
 
300
620
1,100 
 
22
45
80 
 
33
68
120 
 
330
690
1,250 
 
24
50
90
 
 
 9T
 
 
 
8
10
12
 
 
 
1.25
1.25
1.25
 
 
 
34
70
125
 
 
 
340
710
1,300
 
 
 
25
51
94
 
 
 
37
78
140
 
 
 
380
790
1,450
 
 
 
27
57
105
 
 
 10T
 
 
 
8
10
12 
 
 
1.25
1.25
1.25 
 
 
38
78
140 
 
 
390
800
1,450 
 
 
28
58
105 
 
 
42
88
155 
 
 
430
890
1,600 
 
 
31
64
11 6
 
 
 
11 T
 
 
 
8
10
12 
 
 
1.25
1.25
1.25 
 
 
42
87
155 
 
 
430
890
1,600 
 
 
31
64
11 6 
 
 
47
97
175 
 
 
480
990
1,800 
 
 
35
72
130
± INTRODUCTIONSTANDARD BOLT TORQUE SPECIFICATIONSIN±43