20 Most Recent 2003 Ford F250 Questions & Answers

note the diagram for starter relay, the relay has two sides, the switch side, left side in diagram. The control side, right side in diagram. If you used jumper on the switch side and it cranked, but, w/o the jumper, it wouldn't, check the control side of relay for voltage and ground. You can see 15 amp fuse, goes hot with key in the crank position. Also note the transmission range sensor. The bottom black wire on control side is chassis ground. By using jumper on switch side of relay, it bypasses the control side. good luck

With everything turned off, disconnect the ground cable from the battery. Connect a 12v test light between the neg. terminal and the ground cable. If the test light lites up, you have a power draw. The brighter the light, the more draw. Go to the fuse box and remove the light fuse. If the light goes out or dims significantly, at least you know what circuit is bad. If it is still bright, replace that fuse and try another. Also, it is normal to have a slight draw (dim light) for radio memory, computer memory, etc.
Hope this helps.

Check for coolant temp sensor fault, It will affect cold start and idle. It controls open loop mode in the ECU (cold, high idle, open loop) Perform an OBDII scan of the stored fault history. Also make sure coolant level is correct.

Did you change a fuel filter?

Check your mass air flow sensor and all vacuum hoses for leaks, your mass air flow sensor is located somewhere on the intake hose between the air filter box and manifold. Maybe loose wires maybe bad airflow sensor, could just be dirty, could even be timing advance or other sensors. Read codes from computer and go from there but likely something simple.

Fuel filter or possible t-body sensor , weak coil pack. Needs scanning. I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

Try this site: http://www.bbbind.com/free_tsb.html don-ohio

It could take a better scanner to record this, but it can also be a temperature sender. Many Ford trucks lock out the overdrive until the engine warms up. They do this to prevent lugging and stalling. The truck simply does not know the engine is not cold anymore and the diagnostic system sees both cold and hot signals as normal.

How To replace front Brake Pads. In 90% of the car manufacturers the job will be done the same way. This is F250 Ford 2006

The vacuum supply line to the climate control unit could be broken if it is gas engine. If ti is a diesel engine the vacuum motor or pump ,depending on the set up, is not working properly.

use the code that came with the plug. Just sort the car wiring with a volt meter or test light.

This could be the Inertia switch is active. There is a reset button on it. Usually this is placed by the front floor kickpad. Since you have access to the internet, type in your vehicle and the word "inertia switch" and you might find a video about resetting your part. Also it will show you some autoparts photos of this part.

1. Get a factory shop service manual for your truck 2. Put it in a large warm space with lots of room around the front 3. Read through the entire procedure before starting. 4. Do it step by step labeling each thing you take off, put the fasteners for each step in a bag labeling it for the reassembly. 5. Be patient. remember doing yourself will save you $$$. or get a quote from your best local Ford dealer's service dept and schedule the job and pick it up and pay when done.

Check for codes. Usually part stores do it for free. here is how it works. Principles of Operation Electronic Shift on the Fly (ESOF) System The electronic shift on the fly (ESOF) system is an electronic shift system that allows the operator to choose between 2 different 4x4 modes as well as 2-wheel drive. The operator can switch between 2H and 4H mode at speeds up to 88 km/h (55 mph). To engage or disengage 4L, the 4x4 generic electronic module (GEM) requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal depressed and the transmission in NEUTRAL (or clutch pedal applied on manual transmission vehicles). This system contains pulse vacuum hublocks (PVH). The selector on the hublock, when turned fully counterclockwise to the AUTO position, engages/disengages the hub depending on the driver-selected 4x4 mode of operation. The hublocks also contain a manual override. When the selector is rotated fully clockwise to the LOCK position, the 4x4 vacuum and electronic system used for coupling the front axle to the wheel is bypassed. The transfer case is equipped with a dual-cone synchronous clutch. This clutch is used to synchronize the front driveline to the rear. All other internals operate in the same manner as the manual shift system. When the mode select switch (MSS) on the instrument panel is turned, the 4x4 module powers the transfer case motor, which activates a shift fork and engages the clutch. When the shift motor reaches the desired position, as determined by the encoder position inputs to the 4x4 module, power to the shift motor is removed. When the transfer case front and rear output shafts are synchronized, the lockup collar mechanically engages the mainshaft hub to the drive sprocket. At this point, the front axle PVHs are engaged. Instrument cluster "4x4" and "Low Range" indicator operation is controlled via hardwired outputs from the 4x4 module. Electronic Shift Transfer Case The New Venture Gear NV 273 electronic shift transfer case is a 3-piece aluminium design. The unit transfers engine power from the transmission to the front and rear axles. Under normal driving conditions the unit is in 2-wheel drive high (2H), but when desired, the operator may shift into 4-wheel drive high (4H) or 4-wheel drive low (4L). The transfer case is shifted electronically. The unit is lubricated by a positive displacement fluid pump that channels fluid flow through holes in the mainshaft. The encoder assembly used for mode indication is of a Hall-Effect type. The system uses a total of 4 independent transistors for mode recognition. Each transistor is associated with a specific range of motor movement. When the circuit to each transistor is closed, a ground path to any of the A, B, C or D encoder pins is accomplished. When the circuit to each transistor is open, the connection to any of the A, B, C, or D encoder pins is pulled to voltage. Mode indication is "decoded" by the 4x4 module based on the varying combinations of signals coming from the transistors. Hublock Operation With the hublocks in the Auto position, the 4x4 ESOP system uses timed vacuum sequences to lock and unlock the wheel ends when switching the instrument panel MSS between 2WD and 4x4 modes. A high vacuum level (222 mm or 8.75 in. Hg and greater) is applied to the hublocks to lock the internal spring mechanism that engages (locks) the hublocks for 4x4 mode, and a lower vacuum level (114 to 184 mm or 5.9 to 7.1 in. Hg) is applied to unlock the spring mechanism that disengages (unlocks) the hublocks for 2WD mode. The vacuum signals are supplied to the hublocks by system components, including the 4WD control module or GEM, wiring harness, solenoid, vacuum harness and vacuum seals. As a first step in service, eliminate obvious items such as loose wiring connections, loose vacuum connections or damaged vacuum lines.

Does it spin over at regular rate of speed or does it spin slow? Does the wait to start light come on and go off after 10 seconds? If it spins slow check the batteries individually, one weak battery will cause a no start condition.

book says 'near center of i/p (instrument panel). no pic though. this implies it's under the dash in or near the center; probably has a push lock on to a bracket back there hanging off the harness. hope this helps...

sending unit is in with the fuel pump , it is all one unit and will have to be replaced as a complete unit