Fail-Safe Chart

If any of the following DTCs are set, the ECM (Included in HV control ECU) enters fail-safe mode to allow the vehicle to be driven temporarily.

FAIL-SAFE CHART

DTC

Component

Fail-Safe Operation

Fail Safe Deactivation Condition

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 Sensor (HO2S) Heater

ECM turns off HO2 sensor heater

Ignition switch off

P0087, P0088

High pressure side fuel pump

Stop the high side fuel pump
Limit the engine speed to 2,000 rpm or less

Pass condition detected

P0100, P0102 and P0103

Mass Air Flow (MAF) Meter

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

Pass condition detected

P0110, 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, P0607, P0657, P2102, P2103, P2111, P2112, P2118, P2119 and P2135

Electronic Throttle Control System (ECTS)

ECM cuts off throttle actuator current and throttle valve returns to 6.5° 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

P0327, P0328, P0332 and P0333

Knock Sensor

ECM sets ignition timing to maximum retard.

Ignition switch off

P0351 to P0356

Ignitor

ECM cuts fuel

Pass condition detected

NOTE:

⁽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.