cruise control woes
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Senior User
Joined: Dec 2004
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From: New York
cruise control woes
well every once in a while, my cruise control goes haywire kinda.
last weekend, i was on the thruway for 2 hours with no problem, all of a sudden i feel my tuck start accelerating, what was happening was my cruise as acting up and it started giving it more gas. i would tap the brakes, or even hit the off button, reset it and it would be fine for a minute, then my pedal would start moving again. it would give it more gas, then let up and keep doing it, sometimes my truck downshifted becuse it gave it so much gas. It seems like theres a bad switch somewhere, because it seems like its getting a bad conection or something. But 2 days later it worked fine for the 3 hour ride home. I totally forgot about it, except it did it today on the way home from school.
any ideas?
last weekend, i was on the thruway for 2 hours with no problem, all of a sudden i feel my tuck start accelerating, what was happening was my cruise as acting up and it started giving it more gas. i would tap the brakes, or even hit the off button, reset it and it would be fine for a minute, then my pedal would start moving again. it would give it more gas, then let up and keep doing it, sometimes my truck downshifted becuse it gave it so much gas. It seems like theres a bad switch somewhere, because it seems like its getting a bad conection or something. But 2 days later it worked fine for the 3 hour ride home. I totally forgot about it, except it did it today on the way home from school.
any ideas?
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Speed Control Diagnostic Telf Test
The following applies starting around 00 or 01 or so. I don't have my service manuals handy this weekend to verify exact applicability.
Check fuses: Under dash Fuses F5, F13, & F15. Check continuity of cruise deactivator switch and the add-on harness installed per recent recall.
If you get a flash code and the above doesn't pinpoint the fault, post the flash code.
Also, AWAYS BE SPECIFIC ABOUT IDENTIFYING YOUR VEHICLE otherwise it is not possible to look up your info and your request WILL LIKELY BE IGNORED. I generally don't have the disposition to play "20 questions".
Steve
Check fuses: Under dash Fuses F5, F13, & F15. Check continuity of cruise deactivator switch and the add-on harness installed per recent recall.
Self-Test Diagnostics
WARNING:
This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.
1. Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.
2. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.
If the ON switch is not depressed within five seconds after entering the diagnostics mode, the module times out and the procedure must be started over.
The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.
Note:
There will be a slight delay when the last button is pressed and the lamp flashes.
3. A lamp flash with the last button (SET/ACCEL) indicates that the static test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.
If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:
— 2 flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).
— 3 flashes - deactivator switch is open or circuit defective.
— 4 flashes - vehicle speed signal is out of range or circuit is defective
4. Immediately (.25 second delay) after the static test, the speed control servo does a dynamic test by automatically actuating the throttle lever from 8 mm (0.315 in) to 12 mm (0.472 in) of travel from the idle position. During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of the speed control cable and correct connection of speed control cable to throttle lever. Make sure the throttle returns to the idle position.
5. Return the ignition switch to the OFF position and proceed to the Symptom Chart.
WARNING:
This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.
1. Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.
2. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.
If the ON switch is not depressed within five seconds after entering the diagnostics mode, the module times out and the procedure must be started over.
The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.
Note:
There will be a slight delay when the last button is pressed and the lamp flashes.
3. A lamp flash with the last button (SET/ACCEL) indicates that the static test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.
If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:
— 2 flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).
— 3 flashes - deactivator switch is open or circuit defective.
— 4 flashes - vehicle speed signal is out of range or circuit is defective
4. Immediately (.25 second delay) after the static test, the speed control servo does a dynamic test by automatically actuating the throttle lever from 8 mm (0.315 in) to 12 mm (0.472 in) of travel from the idle position. During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of the speed control cable and correct connection of speed control cable to throttle lever. Make sure the throttle returns to the idle position.
5. Return the ignition switch to the OFF position and proceed to the Symptom Chart.
Also, AWAYS BE SPECIFIC ABOUT IDENTIFYING YOUR VEHICLE otherwise it is not possible to look up your info and your request WILL LIKELY BE IGNORED. I generally don't have the disposition to play "20 questions".
Steve
Last edited by projectSHO89; Dec 15, 2007 at 11:04 AM.
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