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THROTTLE POSITION SENSOR Toyota Supra A80

Engine Controls - System/component Tests 11 illustrations ~846 words

THROTTLE POSITION SENSOR

  1. Turn ignition off. Disconnect electrical connector from Throttle Position Sensor (TPS) on throttle body. Note terminal identification. (Scheme 30)and (Scheme 31). NOTE: Some models require that vacuum be applied to throttle opener before checking TPS. See «TPS RESISTANCE SPECIFICATIONS»(ref-21358-S24025638062001010300000) table.
  2. Insert specified thickness feeler gauge between throttle stop screw and throttle lever and check resistance or continuity. See «TPS RESISTANCE SPECIFICATIONS»(ref-21358-S24025638062001010300000) table. Replace or adjust TPS if not within specification.

Scheme 30

Scheme 30
Scheme 30

Scheme 31

Scheme 31
Scheme 31
Application TypeClearance In. (mm)Terminals TestedOhmmeter Reading
Non-Turbo (1)0 (0)VTA & E2340-6300
".016 (.41)IDL & E2500 Or Less
".024 (.61)IDL & E2No Continuity
"Fully OpenVTA & E22400-11,200
""VC & E23100-7200
Turbo (1) (2)0 (0)VTA & E2340-6300
".021 (.53)IDL & E2500 Or Less
".028 (.71)IDL & E2No Continuity
"Fully OpenVTA & E22400-11,200
""VC & E23100-7200
(1) Apply vacuum to throttle opener before checking TPS. (2) This is the main throttle position sensor. (Scheme 32) A sub-throttle position sensor is also used. See SUB-THROTTLE POSITION SENSOR for testing procedures.
(1)Apply vacuum to throttle opener before checking TPS.
(2)This is the main throttle position sensor. (Scheme 32) A sub-throttle position sensor is also used. See SUB-THROTTLE POSITION SENSOR for testing procedures.

TPS RESISTANCE SPECIFICATIONS

  1. Disconnect electrical connector from sub-throttle actuator. (Scheme 32) Note terminal identification. (Scheme 33)
  2. Using ohmmeter, measure resistance between specified terminals. See «SUB-THROTTLE ACTUATOR RESISTANCE SPECIFICATIONS»(ref-21358-S10350463362001010300000) table. Replace sub-throttle actuator if resistance is not within specification.
TerminalsOhms @ 68°F (20°C)
ACM & "A", ACM & A.82-.98
BCM & "B", BCM & B.82-.98

SUB-THROTTLE ACTUATOR RESISTANCE SPECIFICATIONS

Scheme 32

Scheme 32
Scheme 32

Scheme 33

Scheme 33
Scheme 33
  1. Disconnect electrical connector from sub-throttle actuator and sub-throttle position sensor. (Scheme 32)
  2. Remove screws and sub-throttle actuator. (Scheme 32) Ensure no clearance exists between throttle stop screw and throttle valve gear with sub-throttle valve fully closed. Perform STEP 1. (Scheme 34), (Scheme 35) and (Scheme 36).
  3. With sub-throttle valve fully closed, insert specified thickness feeler gauge between throttle stop screw and throttle valve gear and check resistance between specified terminals. See «SUB-THROTTLE POSITION SENSOR RESISTANCE SPECIFICATIONS»(ref-21358-S37069104502001010300000) table. Perform STEPS 2 and 3. (Scheme 34), (Scheme 35) and (Scheme 36).
  4. Replace or adjust sub-throttle position sensor if resistance is not within specification. Reinstall sub-throttle actuator and electrical connectors.
Application TypeClearance In. (mm)Terminals TestedOhmmeter Reading
3.0L Turbo0 (0)VTA & E2320-9100
".016 (.41)IDL & E2500 Or Less
".019 (.48)IDL & E2No Continuity
"Fully OpenVTA & E2100-5900
""VC & E23500-6500

SUB-THROTTLE POSITION SENSOR RESISTANCE SPECIFICATIONS

Scheme 34

Scheme 34
Scheme 34

Scheme 35

Scheme 35
Scheme 35

Scheme 36

Scheme 36
Scheme 36
  1. Ensure ignition is off. To check turbo pressure sensor supply voltage, disconnect electrical connector from turbo pressure sensor. Turbo pressure sensor is located on air intake chamber, near throttle cable bracket. (Scheme 38) NOTE: Turbo pressure sensor has a vacuum hose connected to it and may be identified by wire colors. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-21402) article.
  2. Turn ignition on. Using voltmeter, measure voltage between terminals VC and E2 of wiring harness side of the turbo pressure sensor electrical connector. The VC and E2 terminals are the outer terminals on the electrical connector. Voltage should be 4.5-5.5 volts.
  3. If voltage is not within specification, check wiring circuit. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-21402) article. If voltage is correct, turn ignition off. Reinstall electrical connector on turbo pressure sensor.
  4. To check turbo pressure sensor output voltage, disconnect turbo pressure sensor vacuum hose from intake manifold. Disconnect negative battery cable. Remove passenger's side door scuff plate.
  5. Remove carpet below instrument panel on passenger's side for access to Engine Control Module (ECM), located on floor panel. Remove ECM protector, located above ECM. Remove nuts and separate ECM from floor panel.
  6. Disconnect electrical connectors from ECM and install Check Harness (SST 09990-01000) between wiring harness and ECM. (Scheme 37) Reconnect negative battery cable.
  7. Turn ignition on. Connect voltmeter to terminals PIM and E2 of check harness. (Scheme 37) Measure and record output voltage under ambient atmospheric pressure. Attach vacuum pump to turbo pressure sensor.
  8. Apply vacuum in specified increments and measure output voltage drop at each increment. See «TURBO PRESSURE SENSOR OUTPUT VOLTAGE SPECIFICATIONS»(ref-21358-S13588071262001010300000) table. TURBO PRESSURE SENSOR OUTPUT VOLTAGE SPECIFICATIONS Applied Vacuum: In. Hg Output Voltage Drop 3.94.15-.35 7.87.40-.60 11.81.65-.85 15.75.90-1.10 19.69 1.15-1.35
  9. Replace turbo pressure sensor if output voltage drop is not within specification. Remove check harness. Reinstall all electrical connectors, ECM and vacuum hose.

Scheme 37

Scheme 37
Scheme 37
  1. Disconnect electrical connector and hoses from appropriate Vacuum Switching Valve. For appropriate VSV location, see «VACUUM SWITCHING VALVE LOCATIONS»(ref-21358-S01521181502001010300000) table. (Scheme 38) NOTE: Vacuum switching valve may also be identified by wire colors. See appropriate wiring diagram information in «WIRING DIAGRAMS»(ref-21402) article. VACUUM SWITCHING VALVE LOCATIONS Application Location Exhaust By-Pass Valve VSV Passenger's Side Rear Corner Of Engine, Near Turbocharger Exhaust Gas Control Valve VSV Front Corner Of Engine, By Air Intake Intake Air Control Valve VSV Rear Corner Of Engine, Above Turbocharger Wastegate VSV Front Corner Of Engine, By Air Intake
  2. Remove VSV. Using ohmmeter, check resistance and for continuity between VSV electrical terminals. Replace VSV if no continuity exists or resistance is not within specification. See «VACUUM SWITCHING VALVE RESISTANCE SPECIFICATIONS»(ref-21358-S24964732372001010300000) table. VACUUM SWITCHING VALVE RESISTANCE SPECIFICATIONS Application Ohms @ 68°F (20°C) Exhaust By-Pass Valve VSV 22-26 Exhaust Gas Control Valve VSV 38.5-44.5 Intake Air Control Valve VSV 38.5-44.5 Wastegate VSV 22-26
  3. Ensure no continuity exists between each electrical terminal and VSV body. Replace VSV if continuity exists between electrical terminal and VSV body.
  4. On exhaust gas control valve VSV or intake air control valve VSV, apply air pressure to port "E". Ensure air passes from the filter. (Scheme 39)and (Scheme 40).
  5. Connect battery voltage and ground to VSV terminals. Apply air pressure to port "E". Ensure air passes from port "F". (Scheme 39)and (Scheme 40). Replace VSV if defective and reinstall VSV.
  6. On exhaust by-pass valve VSV or wastegate VSV, apply air pressure to port "E". Ensure no air passes from port "F". (Scheme 39)and (Scheme 40).
  7. Connect battery voltage and ground to VSV terminals. Apply air pressure to port "E". Ensure air passes from port "F". (Scheme 39)and (Scheme 40). Replace VSV if defective.

Scheme 38

Scheme 38
Scheme 38

Scheme 39

Scheme 39
Scheme 39

Scheme 40

Scheme 40
Scheme 40