DTC P0183 - Fuel Temperature Sensor "A" Circuit High Input -

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:
- Detected simultaneously at occurrence of malfunction.
CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >
WIRING DIAGRAM:

Fig 1: Fuel Temperature Sensor Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK CURRENT DATA. Start engine. Read data of fuel temperature sensor signal using Subaru Select Monitor or general scan tool. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to SUBARU SELECT MONITOR . > General scan tool For detailed operation procedures, refer to the General Scan Tool Instruction Manual.	Is the measured value less than -40°C (-40°F)?	Go to step 2.	Repair poor contact. NOTE: In this case, repair the following: Poor contact in fuel pump connector Poor contact in ECM connector Poor contact in coupling connectors Poor contact in joint connector
2 CHECK HARNESS BETWEEN FUEL TEMPERATURE SENSOR AND ECM CONNECTOR. Turn ignition switch to OFF. Remove access hole lid. Disconnect connector from fuel pump. Measure voltage between fuel pump connector and chassis ground. Connector & terminal (R58) No. 5 (+) - Chassis ground (-):	Is the measured value more than 10 V?	Repair battery short circuit in harness between ECM and fuel pump connector.	Go to step 3.
3 CHECK HARNESS BETWEEN FUEL TEMPERATURE SENSOR AND ECM CONNECTOR. Turn ignition switch to ON. Measure voltage between fuel pump connector and chassis ground. Connector & terminal (R58) No. 5 (+) - Chassis ground (-):	Is the measured value more than 10 V?	Repair battery short circuit in harness between ECM and fuel pump connector.	Go to step 4.
4 CHECK HARNESS BETWEEN FUEL TEMPERATURE SENSOR AND ECM CONNECTOR. Measure voltage between fuel pump connector and chassis ground. Connector & terminal (R58) No. 5 (+) - Chassis ground (-):	Is the measured value more than 4 V?	Go to step 5.	Repair harness and connector. NOTE: In this case, repair the following: Open circuit in harness between ECM and fuel pump connector Poor contact in fuel pump connector Poor contact in ECM connector Poor contact in coupling connectors
5 CHECK HARNESS BETWEEN FUEL TEMPERATURE SENSOR AND ECM CONNECTOR. Turn ignition switch to OFF. Measure resistance of harness between fuel pump connector and chassis ground. Connector & terminal (R58) No. 4 - Chassis ground:	Is the measured value less than 5 Ω?	Replace fuel temperature sensor. < Ref. to FUEL TEMPERATURE SENSOR . >	Repair harness and connector. NOTE: In this case, repair the following: Open circuit in harness between ECM and fuel pump connector Poor contact in fuel pump connector Poor contact in ECM connector Poor contact in coupling connectors Poor contact in joint connector