Question about 2004 Ford F150

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2004 Ford F150 4.6L rear wheel drive. ABS pulsates at low speeds.

Light was on and changed out ABS box/module. Light is now off yet the same problem still exists, we also used diagnostic equipment to monitor speed sensors and the reading are normal and no codes exists. Any ideas?

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  • Master
  • 1,114 Answers

This may be an old school question, do you feel pulsating on the brake pedal? Have the brakes, themselves, been checked?

Posted on May 06, 2014

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: 1995 FORD Contour GL V6 AUTO ; Trans.> speed sensor prob.

The speed sensor signal goes through the speedo cluster and then to the PCM, this is the main computer that controls trans and engine functions, in order to see if the PCM is getting the speed sensor signal you need to install what we call a break out box to monitor the signal and see where it is being lost, it could be the connector ar the transmission, pull it off and make sure the wires are not broken inside the insulation near the connector plastic shell, There is no way to fix this without these checks.

Posted on Sep 11, 2008

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SOURCE: 1991 ford ranger not getting any spark

probably the coil , but have your alternator checked first

Posted on Oct 07, 2008

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SOURCE: 1998 FORD WINDSTAR ABS ACTIVATES JUST BEFORE

if the hub and bearing assembly is faulty you may experience this issue

Posted on Nov 12, 2009

emissionwiz
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SOURCE: replaced rear speed sensor

did u replace the Vehicle Speed sensor on the transmission? that is what would cause the cruise to be inop and blind the OD light. it is on the rear tailshaft of the transmission, see photo below of VSS, aldso make sure the connector at the sensor is not full of oil or otherwise making a poor connection.3c5d062.jpg

Posted on Oct 08, 2010

frankgilbert
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SOURCE: 2005 Crow Victoria ABS light on, no communication

Could be contaminated fluid, bad switch....but try to unhook battery and wait 20 seconds and then rehook.

Posted on Nov 03, 2010

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2 Answers

Brakes abs light and pulsating brakes


Too many possibilities. You need to have a scanner that does abs systems used on it and see what the codes are. This could be anything from a faulty wheel speed sensor to a bad abs module.

Aug 17, 2016 | 2001 GMC Jimmy

Tip

Fuse list ford contour


The following specifications are for the Ford Contour and Mercury Mystique manufactured throughout 1995-2000.
Fuses Rating Color Circuit
Engine bay fuse box
1 80 Black Power supply to main fuse box
2 60 Yellow Radiator fan
3 60 Yellow ABS
4 20 Yellow Daytime running lights
5 30 Light green Fog lamp
6 30 Light green Not used
7 30 Light green ABS
8 30 Light green Air pump
9 20 Light bue PCM module
10 20 Light bue Ignition switch
11 3 Violet PCM memory
12 15 Light bue Horn & hazard flasher
13 15 Light bue Oxygen sensor
14 15 Light bue Fuel pump
15 10 Red Right-hand low beam
Passenger compartment fuse box
16 10 Red Left-hand low beam
17 10 Red Right-hand high beam
18 10 Red Left-hand high beam
19 7.5 Brown Heated door mirrors
20 10 Black Windshield wipers
21 30 Light green Electric windows
22 7.5 Brown ABS
23 15 Light bue Reverse lights
24 15 Light bue Brake lights
25 20 Yellow Door locks
26 20 Yellow Main light
27 15 Light bue Cigarette lighter
28 30 Light green Power seats
29 30 Light green Heated rear window
30 7.5 Brown Engine management
31 7.5 Brown Instrument pannel lights
32 7.5 Brown Radio
33 7.5 Brown Front and rear sidelights (left)
34 7.5 Brown Interior lighting & clock
35 7.5 Brown Front and rear sidelights (right)
36 30 Light green Air bag
37 30 Light green Heated blower
38 Unused
Relays Color Circuit Location
Engine bay fuse box
R1 Green Daytime running lights (Canada)
R2 Black Radiator fan (high speed)
R3 Blue AC cut-out
R4 Brown AC clutch
R5 Dark green Radiator fan (low speed)
R6 Yellow Starter
R7 Brown Horns
R8 Brown Fuel pump
R9 White Low beam headlights
R10 White High beam headlights
R11 Brown PCM power supply
Passenger compartment fuse box
R12 White Interior and courtesy lights
R13 Yellow Heated rear window
R14 Yellow Heated blower
R15 Green Windshield wiper motor
R16 Black Ignition
R17 Unused
R18 Black One touch window switch Driver's door
R19 Blue Cruise control cut-off Central fuse box bracket
R20 Unused
R21 Unused
R22 White Fog lights Interface module bracket
R23 Black Turn signals Steering column
R24 White Left-hand flasher Door lock module bracket
R25 White Right-hand flasher Door lock module bracket
R26 Unused
Bulbs / Lights Wattage Type
Low beam headlamp 55 9006 Halogen
High beam headlamp 55 9005 Halogen
Parking / Side light 5 2357A Wedge
Front turn signal 21 2357A Bayonet
Rear turn signal 21 1157 Bayonet
Tail light 21 1157 Bayonet
Stop light 21 1157 Bayonet
High mount stop light 5 2723 Bayonet
Fog/Driving light 55 893 Halogen
License plate 5 6418 Festoon
Reverse light 21 1156 Bayonet
Front sidemarker 5 2357A Wedge
Glove box
Map light 5 64111 Wedge
Dome light 10 6411 Feston
Step/Courtesy light
Trunk/Cargo area
Engine compartment 10 89 Wedge
Instrument-general
Automatic trans indicator

on Apr 15, 2015 | Ford Contour Cars & Trucks

1 Answer

Breaks on Saab 2001


Did you replace the front and rear or just the front? Rear brakes can make the pulsation as well. Also if your ABS system is activating that could be described as a "pulsation". The ABS problem is usually caused by a bad wheel speed sensor or ABS module failure. ABS modules can be rebuilt (see ebay BBA-Reman) Wheel speed sensors are available at most auto parts stores. Some Saabs require the replacement of the whole hub assembly.
7_14_2014_9_11_42_pm.jpg

Jul 11, 2014 | 2010 Saab 9-3

2 Answers

I have a 2004 Pontiac GrandPrix. When coming to a slow stop, abs starts pulsating. Only with slow speed stops, when you are on the brake pedal lightly. No warning lights on, and I pulled the front...


Its the ABS Computer, it is getting to be a common problem now, I have had that happen to me and I almost hit a car. I would unplug the abs until you can get it fixed, the plug is in the box that the brake lines run to from the master cylinder. The ABS light will be on but its better than rear ending someone.

Jun 12, 2011 | 2004 Pontiac Grand Prix

1 Answer

Abs/AWD light on 04 venture


Have you checked the brake fluid level?

Jun 06, 2010 | 2004 Chevrolet Venture Passanger

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Whats wrong my abs light is on, my brake light is on and my speedometer nor odometer are working? 2004 jeep grand cherokee larado 6 cyl 4.0 liter


here is the short version...

the vehicle speed sensor is actual an interpreted signal from the ABS module and the ABS module uses the wheel speed sensors

therefore, if the ABS module sees a problem with any sensor it will affect the PCM input for vehicle speed

another possibility, but worst case, is the ABS module has failed

in either case you will need a professional scan tool to monitor actual wheel speed versus PCM vehicle speed


Apr 05, 2010 | 2004 Jeep Grand Cherokee

1 Answer

ABS brake module sounds like a motor running and won't stop unless battery is disconnected. what is fix?


I would pull the fuse for the ABS hydraulic pump and then put it back in and see what happens. Don't ever recall a pump running. Dealer may need to hook up scan tool for diagnostic fault codes, DTCs.



Principles of Operation
The ABS control module receives wheel speed readings from both front wheel speed sensors and the rear differential speed sensor, and processes this information to determine if an ABS event is necessary. The wheel speed sensor electrically senses each tooth of the ABS sensor indicators as it passes through the wheel speed sensor's magnetic field.
The ABS control module continuously monitors and compares the rotational speed of each wheel speed sensor indicator and, when it detects an impending wheel lock, modulates brake pressure to the appropriate brake caliper(s). This is accomplished by triggering the hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the ABS control module returns the solenoid valves to their normal position, and normal (base) braking resumes.
The ABS control module is self-monitoring. When the ignition switch is turned to the RUN position, the ABS control module will do a preliminary electrical check, and at approximately 20 km/h (12 mph), the pump motor is turned on for approximately one-half second. Any malfunction of the ABS system will cause the ABS to shut off; normal power assisted braking, however, remains.
Inspection and Verification — Scan Tool Communications Check
  1. Verify the customer concern by carrying out the Drive Cycle Test.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Parking brake cable
  • Tire pressure
  • Tire size or mismatched tires
  • Blown fuse
  • Central junction box (CJB):
    • fuse 23 (10A)
  • Battery junction box
    • fuse 102 (50A)
  • Connectors or connections
  • Ground integrity
  • Harness routing
  • Wire chafing
  • Circuitry open/shorted

-----------------------------------------------------------------------
Anti-Lock Control The four-wheel anti-lock brake system (4WABS) consists of the following components:
  • Anti-lock brake control module (2C265)
  • Front anti-lock brake sensor (2C204)
  • Front anti-lock brake sensor indicator (2C182)
  • Hydraulic control unit (2C219)
  • Rear anti-lock brake sensor (2C190)
  • Rear anti-lock brake sensor indicator (2C189)
  • Yellow ABS warning indicator

May 07, 2009 | 2000 Ford Expedition

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What do i do once i have the codes for an ABS problem?


Are both the the abs light and the brake light on ? Usually indicates A bad abs module under the hood in front of the master cylinder if the abs brake come on for no reason yousally while brakeing at low speeds you will feel the pulsation for a few second this is usually corrosin on the hub bearing or a bad abs sensor in the wheel.. A tech with a good scanner can trace the problem to one specifiac wheel hope this helps...

May 05, 2009 | 2002 Chevrolet Avalanche

1 Answer

Abs light coming on , turn key off and it goes back out ?


depends if it just a rear abs or all four abs system. check the rear end on top of the diff there will be a wires coming off it. then the fronts you have to remove the wheels and follow the wire that goes to back of the rotors, and speeking of rotors, get your rotors machined if there is room or just replace them. there warped if your feeling the brake pedal pulsate or the car

Apr 07, 2009 | 1995 Mercury Grand Marquis

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