2008 Scion xD AutomaticFACTORY OEM SERVICE PROCEDURE

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 or stops fuel injection.

Fig 1: Identifying MIL Flashes
G04828037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
FAIL-SAFE CHART

DTC Component Fail-Safe Operation Fail-Safe Deactivation Condition
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
P0102
P0103		 Mass Air Flow (MAF) Meter ECM calculates ignition timing according to engine speed and throttle valve position Pass condition detected
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
P060A
P060D
P060E
P0657
P1607
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
  1. Under low load and low engine speed
    • Fuel cut performed on malfunctioning cylinder
  2. 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 of circuits malfunctions, ECM controls engine using other circuit.
If both of circuits malfunction, ECM regards accelerator pedal as being released. As a result, throttle valve is closed and engine idles.		 Pass condition detected and then ignition switch turned OFF
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.
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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