P0031, P0032, P0051 and
P0052
(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
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,
P060A, 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*.
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 P0358
Igniter
ECM cuts fuel.
Pass condition
detected
P0504
Stop Light
Switch
Accelerator pedal angle is fixed.
Accelerator pedal
angle is fixed
P2120, P2121, P2122,
P2123, P2125, P2127,
P2128 and 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 a result, throttle valve
closed and 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:
*: 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.
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra