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Home >> Subaru >> 2005 >> Forester XT, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Engine (Diagnostics) (H4DOTC) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0463 Fuel Level Sensor Circuit High Input
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DTC P0463 Fuel Level Sensor Circuit High Input

DTC DETECTING CONDITION: 

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 - Fuel Level Sensor Circuit (High Input)
G03807015Courtesy of SUBARU OF AMERICA, INC.
DTC P0463 DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK SPEEDOMETER AND TACHOMETER OPERATION IN COMBINATION METER.  Does the speedometer and tachometer operate normally? Go to step 2.  Repair or replace the combination meter. < Ref. to COMBINATION METER SYSTEM . >
2 CHECK INPUT SIGNAL FOR ECM. 
  1. Turn the ignition switch to ON. (engine OFF)
  2. Measure the voltage between ECM connector and chassis ground.

Connector & terminal 
(B136) No. 20 (+) - Chassis ground (-): 		 Is the voltage more than 4.75 V? Go to step 3.  Even if malfunction indicator light lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector may be the cause.
NOTE: In this case, repair the following:
  • Poor contact in fuel pump connector
  • Poor contact in coupling connector
3 CHECK INPUT VOLTAGE OF ECM. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the combination meter connector (i11) and ECM connector.
  3. Turn the ignition switch to ON.
  4. Measure the voltage of harness between ECM and chassis ground.

Connector & terminal 
(B136) No. 20 (+) - Chassis ground (-): 		 Is the voltage more than 4.75 V? Go to step 4.  Repair the battery short circuit between ECM and combination meter connector.
4 CHECK HARNESS BETWEEN ECM AND FUEL TANK CORD. 
  1. Turn the ignition switch to OFF.
  2. Separate the fuel tank cord connector (R57) and rear wiring harness connector (R15).
  3. Measure the resistance between ECM and fuel tank cord.

Connector & terminal 
(B136) No. 20 - (R15) No. 7: 		 Is the resistance less than 5 Ω? Go to step 5.  Repair the open circuit between ECM and fuel tank cord.
5 CHECK HARNESS BETWEEN FUEL TANK CORD AND CHASSIS GROUND. 
Measure the resistance between fuel tank cord and chassis ground.
Connector & terminal 
(R15) No. 11 - Chassis ground: 		 Is the resistance less than 5 Ω? Go to step 6.  Repair the open circuit between fuel tank cord and chassis ground.
NOTE: In this case, repair the following:
Poor contact in coupling connectors
6 CHECK FUEL TANK CORD. 
  1. Disconnect the connector from fuel level sensor.
  2. Measure the resistance between fuel level sensor and coupling connector.

Connector & terminal 
(R57) No. 11 - (R58) No. 2: 		 Is the resistance less than 10 Ω? Go to step 7.  Repair the open circuit between coupling connector and fuel level sensor.
7 CHECK FUEL TANK CORD. 
  1. Disconnect the connector from fuel sub level sensor.
  2. Measure the resistance between fuel level sensor and fuel sub level sensor.

Connector & terminal 
(R58) No. 3 - (R59) No. 2: 		 Is the resistance less than 10 Ω? Go to step 8.  Repair the open circuit between fuel level sensor and fuel sub level sensor.
8 CHECK FUEL TANK CORD. 
Measure the resistance between fuel sub level sensor and coupling connector.
Connector & terminal 
(R57) No. 7 - (R59) No. 1: 		 Is the resistance less than 10 Ω? Go to step 9.  Repair the open circuit between coupling connector and fuel sub level sensor.
9 CHECK FUEL LEVEL SENSOR. 
  1. Remove the fuel pump assembly. < Ref. to FUEL PUMP . >
  2. While moving the fuel level sensor float up and down, measure the resistance between fuel level sensor terminals.

Terminals 
No. 2 - No. 3: 		 Is the resistance more than 53 Ω? Replace the fuel level sensor. < Ref. to FUEL LEVEL SENSOR . > Go to step 10. 
10 CHECK FUEL SUB LEVEL SENSOR. 
  1. Remove the fuel sub level sensor. < Ref. to FUEL SUB LEVEL SENSOR . >
  2. While moving the fuel sub level sensor float up and down, measure the resistance between fuel sub level sensor terminals.

Terminals 
No. 1 - No. 2: 		 Is the resistance more than 45 Ω? Replace the fuel sub level sensor. < Ref. to FUEL SUB LEVEL SENSOR . > Replace the combination meter. < Ref. to COMBINATION METER . >
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