2008 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

Fail-Safe Chart

HINT:

If any of the following codes are recorded, the ECM enters the fail-safe mode.

FAIL-SAFE CHART

DTC No. Fail-Safe Operation Fail-Safe Deactivation Conditions
P0031, P0032, P0037, P0038, P0051, P0052, P0057 and P0058 The heater circuit in which an abnormality is detected is turned off Ignition switch OFF
P0100, P0102 and P0103 Ignition timing is calculated from engine RPM and TP (Throttle Position) "Pass" condition detected
P0110, P0112 and P0113 IAT (Intake Air Temperature) is fixed at 20°C (68°F) "Pass" condition detected
P0115, P0117 and P0118 ECT (Engine Coolant Temperature) is fixed at 80°C (176°F) "Pass" condition detected
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2102, P2103, P2111, P2112, P2118, P2119 and P2135 If the Electronic Throttle Control System (ETCS) has a malfunction, the ECM cuts off current to the throttle control motor The throttle control valve returns to a predetermined opening angle (approximately 7°) by the force of the return spring The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimal speed
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically		 "Pass" condition detected and then the ignition switch turned OFF
P0327, P0328, P0332 and P0333 Maximum ignition timing retardation Ignition switch OFF
P0351, P0352, P0353, P0354, P0355, P0356, P0357 and P0358 Fuel is cut "Pass" condition detected
P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138 The accelerator pedal position sensor has two (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 two sensor circuits and switches to limp mode In limp mode, the functioning circuit is used to calculate the accelerator pedal opening angle to allow the vehicle to continue driving If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed In this case, the throttle valve will remain closed as if the engine is idling "Pass" condition detected and then the ignition switch turned OFF
P2440 and P1441 and/or P1444 Restrict the throttle opening angle Ga <= 30 g/sec "Pass" condition detected
P1441 and P1444 Restrict the throttle opening angle Ga <= 50 g/sec "Pass" condition detected
P1441 and P1444 Restrict the throttle opening angle Ga <= 100 g/sec "Pass" condition detected
P2430, P2431, P2432 and P2433 Restrict the throttle opening angle Ga <= 50 g/sec "Pass" condition detected
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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