Diagnostic Aids
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
After confirming DTC(s), use Toyota hand-held tester or scan tool to read throttle valve opening by reading THROTTLE POS (displayed as a percentage) and THROTTLE POS#2 (displayed as a voltage) to determine probable cause. See THROTTLE VALVE OPENING POSITION SPECIFICATIONS table. Using hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.
THROTTLE VALVE OPENING POSITION SPECIFICATIONS
| Condition & Throttle Position Reading | Probable Cause | |
|---|---|---|
| Accelerator Pedal Released | ||
| Throttle Pos (0%) & Throttle Pos #2 (0-0.2 Volt) | Open In VC Circuit | |
| Throttle Pos (0% Or 100%) & Throttle Pos #2 (2.1-3.1 Volts) (Fail Safe) |
Open Or Short To Ground In VTA1 Circuit | |
| Throttle Pos (10-24%)(Fail Safe) & Throttle Pos #2 (0-0.2 Or 4.5-5.0 Volts) | Open Or Short To Ground In VTA2 Circuit | |
| Throttle Pos (100%) & Throttle Pos #2 (4.5-5.5 Volts) | Open In E2 Circuit | |
| Throttle Pos (10-24%) & Throttle Pos #2 (2.1-3.1 Volts) | Throttle Position Sensor Circuit Is Normal | |
| Accelerator Pedal Depressed | ||
| Throttle Pos (0%) & Throttle Pos #2 (0-0.2 Volt) | Open In VC Circuit | |
| Throttle Pos (0% Or 100%) & Throttle Pos #2 (2.1-3.1 Volts) (Fail Safe) | Open Or Short To Ground In VTA1 Circuit | |
| Throttle Pos (10-24%) (Fail Safe) & Throttle Pos #2 (0-0.2 Or 4.5-5.5 Volts) | Open Or Short To Ground In VTA2 Circuit | |
| Throttle Pos (100%) & Throttle Pos #2 (4.5-5.5 Volts) | Open In E2 Circuit | |
| Throttle Pos (64-96 %) & Throttle Pos #2 (4.5-5.5 Volts) | Throttle Position Sensor Circuit Is Normal (Does Not Fail Safe) | |