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Home >> Subaru >> 2006 >> Baja Turbo, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls - Engine (Diagnostics) (H4SO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0463 - Fuel Level Sensor Circuit High Input -

DTC P0463 - Fuel Level Sensor Circuit High Input -

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

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

    Connector & terminal 

    (B135) No. 25 (+) - Chassis ground (-): 

 Is the measured value more than 4.75 V? Go to step 3.  Even if MIL 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 ignition switch to OFF.
  2. Disconnect combination meter connector (i10) and ECM connector.
  3. Turn ignition switch to ON.
  4. Measure voltage of harness between ECM and chassis ground.

    Connector & terminal 

    (B135) No. 25 (+) - Chassis ground (-). 

 Is the measured value more than 4.75 V? Repair battery short circuit between ECM and combination meter connector. Go to step 4. 
4 CHECK HARNESS BETWEEN ECM AND FUEL TANK CORD. 
  1. Turn ignition switch to OFF.
  2. Separate fuel tank cord connector (R57) and rear wiring harness connector (R15).
  3. Measure resistance between ECM and fuel tank cord.

    Connector & terminal 

    (B135) No. 25 - (R15) No. 6: 

 Is the measured value less than 5 Ω? Go to step 5.  Repair open circuit between ECM and fuel tank cord.
5 CHECK HARNESS BETWEEN FUEL TANK CORD AND CHASSIS GROUND. 
Measure resistance between fuel tank cord and chassis ground.
Connector & terminal 
(R15) No. 5 - Chassis ground: 		 Is the measured value less than 5 n? Go to step 6.  Repair 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 connector from fuel level sensor.
  2. Measure resistance between fuel level sensor and coupling connector.

    Connector & terminal 

    (R57) No. 5 - (R58) No. 3: 

 Is the measured value less than 1 Ω? Go to step 7.  Repair open circuit between coupling connector and fuel level sensor.
7 CHECK FUEL TANK CORD. 
  1. Disconnect connector from fuel sub level sensor.
  2. Measure resistance between fuel level sensor and fuel sub level sensor.

    Connector & terminal 

    (R58) No. 6 - (R59) No. 2: 

 Is the measured value less than 1 Ω? Go to step 8.  Repair open circuit between fuel level sensor and fuel sub level sensor.
8 CHECK FUEL TANK CORD. 
Measure resistance between fuel sub level sensor and coupling connector.
Connector & terminal 
(R57) No. 6 - (R59) No. 1: 		 Is the measured value less than 1 Ω? Go to step 9.  Repair open circuit between coupling connector and fuel sub level sensor.
9 CHECK FUEL LEVEL SENSOR. 
WARNING: During work procedures, if fuel tank is more than 3/4 full, be careful because fuel may spill.

  1. Remove fuel pump assembly. < Ref. to FUEL PUMP . >
  2. White moving fuel level sensor float up and down, measure resistance between fuel level sensor terminals.

    Terminals No. 3 - No. 6: 

 Is the measured value more than 54.5 Ω? Replace fuel level sensor. < Ref. to FUEL LEVEL SENSOR . > Go to step 10  .
10 CHECK FUEL SUB LEVEL SENSOR. 
WARNING: During work procedures, if fuel tank is more than 3/4 full, be careful because fuel may spill.

  1. Remove fuel sub level sensor. < Ref. to FUEL SUB LEVEL SENSOR . >
  2. While moving fuel sub level sensor float up and down, measure resistance between fuel sub level sensor terminals.

    Terminals No. 1 - No. 2: 

 Is the measured value more than 41.5 Ω? Replace fuel sub level sensor. < Ref. to FUEL SUB LEVEL SENSOR . > Replace combination meter. < Ref. to COMBINATION METER ASSEMBLY . >

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