Toyota Celica 2005 Repair Manual page 452

DTC P0500
CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4−pulse signal for every revolution of the rotor shaft, which is ro-
tated by the transmission output shaft via the driven gear. After this signal is converted into a more precise
rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted
to the ECM. The ECM determines the vehicle speed based on the frequency of these pluse signals.
No.1 Vehicle
Speed Sensor
Transaxle
DTC No.
While vehicle is being driven, no vehicle speed sensor signal
P0500 to ECM
(2 trip detection logic)
MONITOR DESCRIPTION
The ECM assumes that the vehicle is driven when over 30 sec. have passed since the park/neutral position
switch was turned OFF. If there is no signal from the vehicle speed sensor with these conditions satisfied,
the ECM concludes that the vehicle speed sensor is malfunctioning. The ECM will turn on the MIL and a DTC
will be set.
MONITOR STRATEGY
Related DTCs
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
2005 CELICA (RM1131U)
DIAGNOSTICS
Vehicle Speed Sensor Malfunction
4−Pulse
Combination Meter
DTC Detecting Condition
Main sensors/components
Related sensors/components
Continuous
8 sec.
Manual transaxle: 2 driving cycles
Automatic transaxle: Immediate
None
− ENGINE (1ZZ−FE)
4−Pulse
ECM
S Combination meter
S Open or short in vehicle speed sensor circuit
S Vehicle speed sensor
S ECM
P0500
451
Vehicle Speed Sensor
Trouble Area
Vehicle speed sensor "A" pulse input error
Vehicle speed sensor
Park/Neutral position switch, Engine coolant tem-
perature sensor, Combination meter
DI−253
DI38H−12
A00414