DTC P0502 Vehicle Speed Sensor Circuit Low Input

DTC DETECTING CONDITION:

Immediately at fault recognition
GENERAL DESCRIPTION < Ref. to DTC P0502 VEHICLE SPEED SENSOR CIRCUIT LOW INPUT , Diagnostic Trouble Code (DTC) Detecting Criteria. >

CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to , OPERATION , Clear Memory Mode. > and Inspection Mode < Ref. to , PROCEDURE , Inspection Mode. >.

WIRING DIAGRAM:

Fig 1: Wiring Diagram - Vehicle Speed Sensor Circuit (Low Input)

Courtesy of SUBARU OF AMERICA, INC.

DTC P0502 DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN VEHICLE SPEED SENSOR AND ECM CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from vehicle speed sensor and ECM. Measure the resistance of harness between vehicle speed sensor connector and chassis ground. Connector & terminal (B17) No. 1 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 2.	Repair the ground short circuit in harness between vehicle speed sensor and ECM connector.
2 CHECK POOR CONTACT. Check poor contact in the vehicle speed sensor connector.	Is there poor contact in the vehicle speed sensor connector?	Repair poor contact in the vehicle speed sensor connector.	Replace the vehicle speed sensor. < Ref. to VEHICLE SPEED SENSOR . >