2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) P Code Charts Page 2406

- Turn the engine switch on (IG) and turn the Techstream ON.

- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/DTC Check / Clear.

- Turn the engine switch off.

- Turn the engine switch on (IG) and turn the Techstream on [A].

- Fully depress and release the accelerator pedal [B].

- Check that 20 seconds or more have elapsed since the DTCs were cleared.

- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P2121.

- Check the DTC judgment result [C].

HINT

- If the judgment result shows ABNORMAL, the system has a malfunction.

- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] and [C] again.

- If the test result is UNKNOWN, enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

- Read Pending DTCs.

HINT

If a pending DTC is output, the system is malfunctioning.

- If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs

See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/DTC

Check / Clear.

HINT

- If a permanent DTC is output, the system is malfunctioning.

- If no permanent DTC is output, the system is normal.

FAIL-SAFE

The accelerator pedal sensor assembly has 2 (main and sub) sensor circuits. If a malfunction occurs in either of the sensor circuits, the ECM detects

the abnormal signal voltage difference between the 2 sensor circuits and switches to limp mode. In limp mode, the functioning circuit is used to

calculate the accelerator pedal angle to allow the vehicle to continue driving. If both circuits malfunction, the ECM regards the angle of the

accelerator pedal as being fully closed. In this case, the throttle valve remains closed as if the engine is idling. If a pass condition is detected and then

the engine switch is turned off, the fail-safe operation stops and the system returns to a normal condition.