Toyota Tundra Service Manual: Fail-safe Chart

FAIL-SAFE CHART

If any of the following DTCs are stored, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily.

DTC

Component

Fail-Safe Operation

Fail-Safe Deactivation Condition

P0011, P0021, P0015 and P0025

VVT system

  • Idle up (Control of combustion worsening)
  • Stopping fuel-cut control

Pass condition detected

P0031, P0032, P0051 and P0052

Air-Fuel Ratio (A/F) Sensor Heater

ECM turns off A/F sensor heater.

Ignition switch off

P0037, P0038, P0057 and P0058

Heated Oxygen (HO2) Sensor Heater

ECM turns off HO2 sensor heater.

Ignition switch off

P006A

MAP Sensor

  • Idle up is performed.
  • VVT operation is stopped.
  • Updating A/F learning value is prohibited.

Pass condition detected and then ignition switch turned off

P0102 and P0103

Mass Air Flow (MAF) Meter

ECM calculates ignition timing according to engine speed and throttle valve position.

Pass condition detected

P0107 and P0108

Manifold Absolute Pressure Sensor

ECM calculates ignition timing according to engine speed and throttle valve position.

Pass condition detected

P0112 and P0113

Intake Air Temperature (IAT) Sensor

ECM estimates IAT to be 20°C (68°F).

Pass condition detected

P0115, P0117 and P0118

Engine Coolant Temperature (ECT) Sensor

ECM estimates ECT to be 80°C (176°F).

Pass condition detected

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P2102, P2103, P2111, P2112, P2118, P2119 and P2135

Electronic Throttle Control System (ETCS)

ECM cuts off throttle actuator current and throttle valve returned to 7° throttle position by return spring.

ECM then adjusts engine output by controlling fuel injection (intermittent fuel-cut) and ignition timing in accordance with accelerator pedal opening angle to allow vehicle to continue at minimal speed*1.

Pass condition detected and then ignition switch turned off

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308*2

  • Fuel Injector
  • Electronic Throttle Control System (ETCS)

When misfire occurs, fuel cut is performed for catalyst overheat malfunction prevention.

  • During normal load and normal engine speed (MIL is blinking):

    - Fuel cut is performed on malfunctioning cylinder.

  • During high load and high engine speed (MIL is blinking):

    - Throttle valve opening angle control is performed.

    - All cylinder fuel cut or malfunctioning cylinder fuel cut is performed.

Pass condition detected and then ignition switch turned off

P0327, P0328, P032C, P032D, P0332, P0333, P033C and P033D

Knock Sensor

ECM sets ignition timing to maximum retard.

Ignition switch off

P0351 to P0358

Igniter

ECM cuts fuel.

Pass condition detected

P0401

EGR Valve

ECM assumes that EGR valve is closed so that ignition advance is set to a safe value.

Pass condition detected

P0403

EGR Valve

ECM assumes that EGR valve is closed so that ignition advance is set to a safe value.

Pass condition detected

P0504

Stop Light Switch

The accelerator pedal opening angle is fixed when there is an accelerator pedal malfunction or history of a malfunction.

Pass condition detected

P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138

Accelerator Pedal Position (APP) Sensor

The accelerator pedal position sensor has 2 sensor circuits: Main and Sub.

If either circuit malfunctions, the ECM limits the engine output.

If both circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve is closed and the engine idles.

Pass condition detected and then ignition switch turned off

P2432, P2433, P2437 and P2438

Secondary Air Injection System

Throttle valve opening angle control is performed.

Pass condition detected

P2440 and P2442

Secondary Air Injection System

Throttle valve opening angle control is performed.

Pass condition detected

P2445 and P2447

Secondary Air Injection System

Throttle valve opening angle control is performed.

Pass condition detected

HINT:

  • *1: The vehicle can be driven slowly when the accelerator pedal is depressed firmly and slowly. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically.
  • *2: Misfire related fail-safe operations occur when catalyst overheat malfunctions occur.
    EVAP System

    Freeze Frame Data

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