How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask HDGENE Your Own Question
HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 4784
Experience:  25 years Auto experience, Ford ,GM, Chrysler, Asian & European
285738
Type Your Ford Question Here...
HDGENE is online now
A new question is answered every 9 seconds

2004 ford f150 fx4 cruise control works on and off. Fuse is

Customer Question

2004 ford f150 fx4 cruise control works on and off. Fuse is good and don't know what the problem is. I've read it can be a number of different things. It's been bad for about 2 years now and the other day I decided to see if it worked and surprisingly it turned on! But after a few minutes of working it just shut off and wouldn't come back on. Please help.
Submitted: 1 year ago.
Category: Ford
Expert:  HDGENE replied 1 year ago.

hello, first thing to check is if the stop lamps are working properly and not coming on when the brake pedal isnt depressed, if they are this will cancel the cruise operation.this model year doesnt offer a self test, any diagnostic would need to be done using a scan tool but you can run through the pinpoint test for it being inop to test the system:

Other thing to check is the cruise control deactivation switch its a two wire connector on the master cylinder,they had a recall on the switches for leaking so make sure the switch isnt leaking by unplugging it and checking for brake fluid in it.

Pinpoint Test A: The Speed Control Is Inoperative

Normal Operation

The powertrain control module (PCM) sends a signal through circuit 151 (LB/BK) to the speed control switches which passes through the clockspring. The return signal is sent through circuit 848 (DG/OG) and the clockspring. The brake pedal position (BPP) switch sends a voltage signal through circuit 599 (PK/LG) to the powertrain control module (PCM) when the brake pedal is applied, and deactivates the speed control if engaged.

The speed control deactivator switch interrupts the power signal to the PCM through circuit 307 (BK/YE) when the brake pedal is applied firmly and passes the BPP switch trip point. This is a redundant speed control cancel signal to the PCM.

Possible Causes

  • circuit 307 (BK/YE) open or shorted to power
  • circuit 533 (TN/RD) open
  • speed control switch
  • digital transmission range (TR) sensor
  • parking brake switch circuitry
  • vehicle speed signal
  • speed control deactivator switch
  • PCM

PINPOINT TEST A : THE SPEED CONTROL IS INOPERATIVE

A1 CHECK FOR DTCS

  • Review the recorded DTCs from the powertrain control module (PCM) self-test.


Are any non-speed control DTCs recorded?

YesREFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual. REPAIR all PCM DTC's and RETEST the speed control.

NoGO to A2.

A2 CHECK THE SPEED CONTROL SWITCH

  • Ignition OFF.
  • Disconnect: PCM C175b.
  • Measure the resistance between the PCM C175B-56, circuit 151 (LB/BK), harness side and the PCM C175B-57, circuit 848 (DG/OG), harness side.

    Speed Control Switch

    Speed Control SwitchesResistance Value

    OFFLess than 5 ohms

    COAST285 - 315 ohms

    SET570 - 630 ohms

    RESUME1,055 - 1,165 ohms

    ON2,005 - 2,216 ohms

    No switch pressed4,094 - 4,526 ohms



Are the speed control switch resistance values OK?

YesGO to A3.

NoINSTALL a new speed control switch. REFER to Speed Control Switch — With Remote Audio/Climate Controls or Speed Control Switch — Without Remote Audio/Climate Controls in this section. CLEAR the DTCs. REPEAT the self-test.

A3 CHECK THE DIGITAL TRANSMISSION RANGE (TR) SENSOR

  • Connect: PCM C175b.
  • Ignition ON.
  • Enter the following diagnostic mode on the scan tool: PID Data Monitor and Record.
  • Monitor the TR sensor PID.
  • Select DRIVE.


Does the PID value agree with the transmission range selector lever position?

YesGO to A4.

NoREFER to Section 307-01 to diagnose the TR sensor.

A4 CHECK THE PARKING BRAKE WARNING INDICATOR

  • While observing the parking brake warning indicator, apply and release the parking brake.


Does the parking brake warning indicator operate correctly?

YesGO to A5.

NoREFER to Section 413-00 to diagnose the parking brake warning indicator.

A5 CHECK THE SPEEDOMETER OPERATION

  • Check the operation of the speedometer.


Does the speedometer operate correctly?

YesGO to A6.

NoREFER to Section 413-00 to continue diagnosis of the speedometer.

A6 CHECK THE SPEED CONTROL DEACTIVATOR SWITCH FOR CORRECT OPERATION

  • Ignition OFF.
  • Disconnect: PCM C175b.
  • Ignition ON.
  • While firmly applying and releasing the brake pedal, measure the voltage between the PCM C175B-47, circuit 307 (BK/YE), harness side and ground.


Is the voltage greater than 10 volts with the brake pedal released and 0 volts with the brake pedal firmly applied?

YesGO to A10.

NoGO to A7.

A7 CHECK CIRCUIT 533 (TN/RD) FOR AN OPEN

  • Ignition OFF.
  • Disconnect: Speed Control Deactivator Switch C277.
  • Ignition ON.
  • Measure the voltage between the speed control deactivator switch C277-2, circuit 533 (TN/RD), harness side and ground.


Is the voltage greater than 10 volts?

YesGO to A8.

NoREPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

A8 CHECK CIRCUIT 307 (BK/YE) FOR A SHORT TO POWER

  • Measure the voltage between the speed control deactivator switch C277-1, circuit 307 (BK/YE), harness side and ground.


Is any voltage present?

YesREPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

NoGO to A9.

A9 CHECK CIRCUIT 307 (BK/YE) FOR AN OPEN

  • Ignition OFF.
  • Measure the resistance between the PCM C175B-47, circuit 307 (BK/YE),, harness side and the speed control deactivator switch C277-1, circuit 307 (BK/YE), harness side.


Is the resistance less than 5 ohms?

YesINSTALL a new speed control deactivator switch. REFER to Speed Control Deactivator Switch in this section. CLEAR the DTCs. REPEAT the self-test.

NoREPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

A10 CHECK FOR CORRECT PCM OPERATION

  • Disconnect all the PCM connectors.
  • Check for:
    • corrosion
    • pushed-out pins
  • Connect all the PCM connectors and make sure they are seated correctly.
  • Operate the system and verify the concern is still present.


Is the concern still present?

YesINSTALL a new PCM. REFER to Section 303-04A or Section 303-04B. CLEAR the DTCs. REPEAT the self-test.

NoThe system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.