P0503
DTC P0500 Vehicle Speed Sensor Circuit MalfunctionDTC P0503 Vehicle Speed Sensor Circuit Malfunction
DTC Detection Conditions:
DESCRIPTION
The vehicle speed is detected using the No.1 vehicle speed sensor. The No.1 vehicle speed sensor transmits a 4-plus signal for every revolution of the rotor shaft, which is rotated by the transaxle output shaft via the driven gear. The 4-plus signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter. The signal is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of the pulse signal.
Monitor Strategy (Part 1):
Monitor Strategy (Part 2):
Typical Enabling Conditions:
Typical Malfunction Thresholds:
MONITOR DESCRIPTION
Automatic Transaxle Models
The ECM assumes that the vehicle is being driven, when the indicated engine speed is more than 2,300 rpm and 30 seconds have elapsed since the Park/Neutral Position (PNP) switch was turned OFF. If there is no speed signal from the combination meter, despite these conditions being met, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and sets the DTC.
Manual Transaxle Models
The ECM assumes that the vehicle is being driven, when a high engine load or fuel-cut with the accelerator pedal released continues for 5 seconds or more. If there is no speed signal from the combination meter, despite this condition being met, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and sets the DTC.
Wiring Diagram:
Step 1-2:
Step 2(Continued)-4:
Step 4(Continued)-5:
INSPECTION PROCEDURE
HINT: Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.