Diagnostic Aids
WARNING: This page is about a different car, the 2003 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
- After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138, use hand-held tester or OBD II scan tool to confirm throttle valve opening percentage. See Fig 1.
- Read freeze frame data using hand-held tester or the OBD-II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, this is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not or the air-fuel ratio was lean or rich at the time of the malfunction.