DTC 21

DTC 21 Vehicle Speed Sensor "A"

CIRCUIT DESCRIPTION

DTC Detection Condition:

The vehicle speed sensor detects the rotation speed of the transmission output shaft and sends signals to the ECM. The ECM determines the vehicle speed based on these signals. An AC voltage is generated in the vehicle speed sensor coil when the rotor mounted on the output shaft rotates, and then this voltage is sent to the ECM.

Wiring Diagram:

Step 1 - 3:

Step 4:

INSPECTION PROCEDURE

HINT: Read freeze frame data using hand-held tester or OBD II scan tool. Because freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.