20 Most Recent 2003 Ford Expedition - Page 5 Questions & Answers

There is a diagram on the under hood emission sticker required by the federal government on every vehicle sold.

It is located behind the rear cargo area trim panel.

No that is due to a defective power rack and pinion steering gear box.

Most likely bad wiring due to corrosion or some sort of disconnection somewhere within the wiring harness. Pull the head unit out and check for any issues. Make sure to watch this video, start at 4:18

This DTC says nothing about changing the sensor or the connector or pig tail ! It's a circuit voltage low code P0405 - DPF EGR Sensor Circuit Low Voltage Detected See DTC P1400 Problem with wiring or PCM ! P1400 - DPF EGR Sensor Circuit Low Voltage Detected The EGR monitor checks the DPF EGR sensor signal to the PCM for low voltage. The test fails when the average voltage to the PCM drops to a voltage less than the minimum calibrated value.

• DPFEGR circuit short to GND
• Damaged DPF EGR sensor
• VREF short to GND
• Damaged PCM

A DPF EGR PID reading less than 0.2 volt with the key ON and engine OFF or running, indicates a hard fault.

Sounds like the fuel pump relay is buzzing. Try swapping it for another relay...something like power seat or window.

This should help, Suzuki Workshop Manuals

Why is it idolizing by itself when it's in park? What does that mean?

You checked the relays,found nothing wrong,so youinstalled new ones anyway?You checked the starter how?You hear the solenoid click & that doesn't tell youwhere it is?

2003 Ford Expedition Workshop Repair Service Manual PDF Download for better result download the pdf file

Watch the youtube video. 03 Ford Expedition XLT V8 5 4 liter fuel filter replacement

Make sure it is not the valet key.

Inspection and Verification

1. Visually inspect the following for obvious signs of mechanical or electrical damage. Visual Inspection Chart Mechanical Electrical
   • Central junction box (CJB)
   • Brake pedal position (BPP) switch
   • Multifunction switch
   • CJB fuse 2 (20A)
   • Circuitry
   • Stop lamp bulbs

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

1. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.

Symptom Chart NOTE: Refer to Wiring Diagrams Cell 90 for schematic and connector information. Symptom Chart Condition Possible Sources Action

• The stop lamps are inoperative

• Central junction box (CJB) fuse 2 (20A).
• Circuitry.
• Brake pedal position (BPP) switch.

• Go To Pinpoint Test H

-Sounds like bad fuel pressure. Good luck Mai

fuse box end of dash

Check out the fuel pump on an oscillscope
Check the fuel pressure at the fuel rail
Need a clean fuel filter

Check TPS with a scope

I say scope because it will show you
quickly what is going on,where as a
volt meter only gives you numbers (volts)

Scope the O2 Sensors also or replace if
at 100,000 miles (front 2 only)

Spray throttle plate and MAF Sensor
with the CRC Products for those two