Fail-Safe Chart

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

FAIL-SAFE CHART

DTCs

Components

Fail-Safe Operations

Fail-Safe Deactivation Conditions

P0031
P0032

Air-Fuel Ratio (A/F) Sensor Heater

ECM turns off A/F sensor heater.

Ignition switch OFF

P0037
P0038

Heated Oxygen (HO2) Sensor Heater

ECM turns off HO2 sensor heater.

Ignition switch OFF

P0100
P0102
P0103

Mass Air Flow (MAF) Meter

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

Pass condition detected

P0110
P0112
P0113

Intake Air Temperature (IAT) Sensor

ECM estimates IAT to be 20°C (68°F).

Pass condition detected

P0115
P0117
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
P0607
P0657
P2102
P2103
P2111
P2112
P2118
P2119
P2135

Electronic Throttle Control System (ETCS)

ECM cuts off throttle actuator current and throttle valve returned to 6° 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 ⁽²⁾

Fuel injector
Electronic Throttle Control System (ETCS)

When catalyst damage misfire occurs (MIL blinking), following fail-safe operation performed for catalyst overheat malfunction prevention

Under low load and low engine speed
- Fuel cut performed on malfunctioning cylinder
Under high load and high engine speed
- Throttle valve opening angle control is performed
- All cylinder fuel cut or malfunction cylinder fuel cut

Pass condition detected and then ignition switch turned OFF

P0327
P0328

Knock Sensor

ECM sets ignition timing to maximum retard.

Ignition switch OFF

P0351 to P0354

Igniter

ECM cuts fuel.

Pass condition detected

P2120
P2121
P2122
P2123
P2125
P2127
P2128
P2138

Accelerator Pedal Position (APP) Sensor

APP sensor has 2 sensor circuits: Main and Sub.
If either circuit malfunctions, ECM controls engine using other circuit.
If both circuits malfunction, ECM regards accelerator pedal as being released. As result, throttle valve closed and engine idles.

Pass condition detected and then ignition switch turned OFF

⁽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.