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jackduppel
jackduppel, Auto Service Technician
Category: Car
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Experience:  ASE Certified Automotive Technician
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2004 Mercury Mountaineer: 000 miles..The service engine soon light

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I have a 2004 Mercury Mountaineer with 29,000 miles on it. The service engine soon light came on and the error code is P0461. Car runs fine and the gas gauge appears to be working. Any tought's.

Hello and welcome to JA,

 

Below is a diagnostic flow chart to fix this code. I usually clear the code first - then redrive the car to reset the monitors- if the code does not re-occur then it was a false code- if it does re-occur then use the below chart ( or have your mechanic do it) to diagnose & repair the truck. Good Luck

 

DTC P0461


BHE010200400W04

 

 

DTC P0461

 

Fuel gauge sender unit circuit range/performance problem

 

DETECTION CONDITION

• The PCM monitors the fuel tank level difference before and after the PCM-calculated fuel consumption has reached more than 21 L {22.2 US qt, 18.5 Imp qt}. If the difference is less than 5 %, the PCM determines that there is a fuel gauge sender unit circuit range/performance problem.

Diagnostic support note

• This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Fuel gauge sender unit malfunction • Instrument cluster malfunction • PCM malfunction

 

Diagnostic procedure

STEP

 

INSPECTION

 

ACTION

 

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

• Has FREEZE FRAME DATA been recorded?
Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• Verify related service repair information availability. • Is any related repair information available?
Yes Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3

INSPECT INSTRUMENT CLUSTER

• Perform the "INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE". (See INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE.) • Is there any malfunction?
Yes Repair or replace the malfunctioning part, then go to Step 5.
No Go to the next step.
4

INSPECT FUEL GAUGE SENDER UNIT

• Inspect the fuel gauge sender unit. (See FUEL GAUGE SENDER UNIT INSPECTION.) • Is there any malfunction?
Yes Replace the fuel gauge sender unit, then go to the next step. (See FUEL GAUGE SENDER UNIT REMOVAL/INSTALLATION.)
No Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
5

VERIFY AFTER REPAIR PROCEDURE

• Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present?
Yes Go to the applicable DTC inspection. (See DTC TABLE.)
No DTC troubleshooting completed.
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