The following tests can be performed to ensure the health of the TCM (Throttle Control Motor), TPS (Throttle Position Sensor) and the APPS (Accelerator Pedal Position Sensor)

You can use this for a IS300 and Supra 2JZ with VVTi and as far as I know it’s the same for the 1JZ VVTi.

 

• NOTE – All voltage and resistance values are from the 2JZGE VVTi but should be the same for the 2JZGTE VVTi, I can’t confirm this for sure but it’s the same system and should use the same sensors, also the pictures in the diagrams my differ slightly due to the different designs of the throttle body locations
• Throttle control motor –
  • Resistance between terminal 3 (CL-) and 4 (CL+) –  4.2 – 5.2 W at 20°C (68°F)
  • Resistance between terminal 1 (M+) and 2 (M-) – 0.3 – 100 W at 20°C (68°F)

• Throttle Position Sensor –
  • Resistance between terminals VC and E2 – 1.2 – 3.2 kW at 20°C (68°F)
  • TPS Voltage – 0.3-0.9 volts (Idle), 3.5-4.7 volts (WOT)
  • Check connector at VC from ECM of around 5 volts to ensure wiring is correct
• Accelerator Pedal Position Sensor –
  • Resistance between terminals VC and E2 – 1.2 – 3.2 kW at 20°C (68°F)
  • Voltage – 0.3 – 0.9 volts (idle)
  • Check connector at VC from ECM of around 5 volts to ensure wiring is correct

• Mechanical fault – The throttle valve in the throttle body could be jammed or have an obstruction, ensure its cleaned out with carb cleaner or degreaser
• Idle adjustment nuts – Don’t touch this as the idle should not need to be adjusted because it’s all controlled by the ECM, if you do make changes the ECM will adjust as required but you can test it though for fine adjustment (Think there is 1 nut on top and 1 below the throttle

 

 

Some pictures of the 2JZGTE VVTi ETCS-i below;

 

 

 

 

Hopefully this article helps you for any ETCS-i issues, if you have any further troubleshooting information to add then please let me know by commenting below