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DI-257
DIAGNOSTICS - ENGINE (1GR-FE)
DIDTS-01
DTC P0500 Vehicle Speed Sensor "A"
DTC P0503 Vehicle Speed Sensor "A" Intermittent/
Erratic/High
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 pulse signals.
4-pulse 4-pulse
Vehicle Speed Combination ECM
Sensor Meter
P22487
DTC No. Proceed to DTC Detection Condition Trouble Area
No vehicle speed sensor sig-
S Combination meter
nal to ECM under following
S Open or short in vehicle speed sensor circuit
P0500 Step 1 conditions: (1 trip detection
S Vehicle speed sensor
logic)
S ECM
S Vehicle is being driven
S Combination meter
Intermittent problem in the ve- S Open or short in vehicle speed sensor circuit
P0503 DI-11
hicle speed sensor circuit S Vehicle speed sensor
S ECM
MONITOR DESCRIPTION
The ECM assumes that the vehicle is driven when the park/neutral position switch is OFF and it has been
over 4 sec. since the actual vehicle speed was 6 mph (9 km/h) or more.
If there is no signal from the vehicle speed sensor when these conditions are satisfied, the ECM concludes
that there is a fault in the vehicle speed sensor. The ECM will turn on the MIL and a DTC is set.
DI-258
DIAGNOSTICS - ENGINE (1GR-FE)
MONITOR STRATEGY
Related DTCs P0500 Vehicle speed sensor "A" pulse input error
Main sensors Vehicle speed sensor
Required sensors/components Park/Neutral position switch, Engine coolant tem-
Related sensors
perature sensor, Combination meter
Frequency of operation Continuous
Case 1: 500 times
Duration
Case 2: 8 sec.
Case 1: Immediate
MIL operation
Case 2: 2 driving cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-18
not present
Case 1:
Vehicle speed is 5.59 mph (9 km/h) or
4 sec. -
more
Park/neutral position switch OFF
Case 2:
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