−
DIAGNOSTICS
ENGINE (1ZZ
−
FE)
DI
−
103
2005 CELICA (RM1131U)
DTC
P0121
Throttle/Pedal Position Sensor/Switch ”A”
Circuit Range/Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0120 on page DI−96.
DTC No.
Detection Item
Trouble Area
P0121
After the vehicle speed has been exceeded 30 km/h (19 mph)
even once, the output value of the throttle position sensor is
out of the applicable range while the vehicle speed is between
30 km/h (19 mph) and 0 km/h (0 mph).
(2 trip detection logic)
S
Throttle position sensor
S
ECM
MONITOR DESCRIPTION
The throttle position sensor varies its resistance with the angle of the throttle valve. The ECM applies a regu-
lated reference voltage to the throttle position sensor positive terminal and calculates the angle of the throttle
valve based on the current voltage at the throttle position sensor “signal” terminal.
When the throttle valve is near the fully closed position, the output voltage of the throttle position sensor is
low. When it is near the fully open position, the output voltage is high.
The ECM checks the indicated angle of the throttle valve during “stop and go” conditions. If the indicated
angle (or voltage) in the “closed throttle” position is out of the specified range 8 times or more, the ECM inter-
prets this as a malfunction in the throttle position sensor and sets a DTC.
MONITOR STRATEGY
Related DTCs
P0121
Throttle position sensor rationality
Required sensors/components
Main sensors/components
Throttle position sensor
Related sensors/components
Vehicle speed sensor
Frequency of operation
Continuous
Duration
8 times or more
MIL operation
2 driving cycles
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
Item
Specification
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page DI
−
3
Malfunction criteria and its threshold are met 8 times from once GO is judged until STOP is judged
GO: Vehicle speed
30 km/h (18.63 mph)
−
STOP: Vehicle speed
−
0 km/h (0mph)
DI383
−
15
301
Содержание Celica 2005
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