Fail Safe Chart

DTC No.

Fail-Safe Operation

Fail-Safe Deactivation Conditions

P0031, P0032, P0037, P0038

The heater circuit in which an abnormality is detected is turned off.

Ignition switch OFF.

P0100, P0102, P0103

Ignition timing is calculated from an engine speed and a throttle angle.

Return to normal condition.

P0110, P0112, P0113

Intake air temp. is fixed at 20"C (68"F).

Return to normal condition.

P0115, P0117, P0118

Engine coolant temp. is fixed at 80" C (176-F).

Return to normal condition.

P0120, P0122, P0123, P0220, P0222, P0223, P2135

Fuel cut intermittently when idle.

Return to normal condition and ignition switch OFF.

P0121

Fuel cut intermittently when idle.

Return to normal condition and ignition switch OFF.

P0327, P0328

Max. timing retardation.

Ignition switch OFF.

P0351, P0352, P0353, P0354

Fuel cut.

Return to normal condition.

P2102, P2103

Fuel cut intermittently when idle.

Return to normal condition and ignition switch OFF.

P2111, P2112

Fuel cut intermittently when idle.

Return to normal condition and ignition switch OFF.

P2119

Fuel cut intermittently when idle.

Return to normal condition and ignition switch OFF.

Fail-safe of Accelerator Pedal Position Sensor

The accelerator pedal position sensor comprises two (Main, Sub) sensor circuits.

If a malfunction occurs in either of the sensor circuits, the ECM detects the abnormal signal voltage difference between these two sensor circuits and switches into the limp mode. In the limp mode, the remaining circuit is used to calculate the accelerator pedal opening, in order to operate the vehicle under limp mode control.

Toyota Wetlook Coil Wiring

D13N08

If both circuits malfunction, the ECM detects the abnormal signal voltage from these two sensor circuits and discontinues the throttle control. At this time, the vehicle can be driven within its idling range.

Toyota P0100 Wiring Diagram

D13N09

Fail-safe of Throttle Position Sensor

The throttle position sensor comprises two (Main, Sub) sensor circuits.

If a malfunction occurs in either of the sensor circuits, the ECM detects the abnormal signal voltage difference between these two sensor circuits, cuts off the current to the throttle control motor, and switches to the limp mode.

Then, the force of the return spring causes the throttle valve to return and stay at the prescribed opening. At this time, the vehicle can be driven in limp mode while the engine output is regulated through the control of the fuel injection and ignition timing in accordance with the accelerator opening.

The same control as above is effected if the ECM detects a malfunction in the throttle control motor system.

Aspirated Mixer Aerobic System

D13N10

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Responses

  • anne
    What causes fail safe mode on 99 rav4?
    3 years ago
  • samira
    What parts would cause fail safe on a 99 rav4?
    3 years ago
  • Pearl
    How fix fail safe mode on ecm on 2000 celica?
    2 years ago
  • folco
    Does toyota 4s engine fail safe?
    2 years ago
  • GREGORY
    What is a fail safe mode on camry computer?
    1 year ago
  • Roma
    What does a fail safe switch on a toyota?
    10 months ago

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