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2005 merc sable cruise won't work
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lfinley
New User
Jan 15, 2012, 9:48 AM
Post #1 of 4
(6035 views)
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2005 merc sable cruise won't work
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I have a 2005 Mercury Sable with 3.8 liter v-6 that has 83,000 miles. The cruise control has stopped working even though the cruise light comes on. The engine won't hold speed. I have checked the fuse and it is fine. What do you think?
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 15, 2012, 11:23 AM
Post #2 of 4
(6014 views)
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Re: 2005 merc sable cruise won't work
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That year didn't have the 3.8L. Check again. It's either 3.0L ohv or 3.0L DOHC.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 15, 2012, 11:24 AM)
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lfinley
New User
Jan 15, 2012, 1:10 PM
Post #3 of 4
(5995 views)
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Re: 2005 merc sable cruise won't work
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Sorry. My fault. It is a 3.0 liter. I also have 2 Windstars and got confused.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 15, 2012, 1:41 PM
Post #4 of 4
(5989 views)
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Re: 2005 merc sable cruise won't work
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There is a self test the cruise control system can perform when you enable it. The only problem is that you need a scan tool to monitor the throttle position sensor voltage to see if the voltage changes when the self test performs the pull test.
You may be able to find out if there are any sub system codes by doing the test though.
1. Start off by doing a visual inspection of the servo and components. Make sure the electrical connections are good and the cable is connected to the throttle cam.
2. Make sure the brake lamps are functional and not stuck on.
3. Start the self test:
SERVICE PROCEDURE Start by running speed control servo integrated self test diagnostics. The servo has integrated self test diagnostics which is a key tool in quickly and accurately diagnosing speed control system faults. Self test diagnostics are also the basis for starting speed control trouble shooting.
WARNING: This test is a Key On Engine Off (KOEO) test that is conducted only while parked with the parking brake fully engaged. Failure to follow these instructions may result in personal injury.
NOTE: This self-test is comprised of two parts. The first part is a static check of the speed control electronics module and system. The second part is a dynamic pull-test to check the actuator motor and gear mechanism.
NOTE: The module times out if each button is not pressed within 1 second of the previous button. If a module time out occurs (speed control lamp stops flashing part way through the test), the procedure must be re-initiated.
NOTE: On vehicles equipped with a manual transmission, the clutch pedal should not be depressed except for Escape/Mariner, which should be depressed, in order to correctly perform the self-test. On vehicles equipped with an automatic transmission, the transmission selector lever needs to be in the "P" position for the self test except for the Escape/Mariner which should be in "N".
NOTE: Review the following steps before carrying out the self-test diagnostic procedure.
1. Self Test Diagnostic Procedure - Static Test
a. Connect the Diagnostic Scan Tool (DST) to a power source that is not interrupted when the ignition switch changes positions. With the ignition switch in the RUN position, set the DST to monitor the Powertrain Control Module (PCM) throttle position PID while the speed control actuator carries out the self-test.
b. Enter self-test diagnostics by firmly pressing and holding the speed control OFF switch while quickly cycling the ignition switch from RUN-to-OFF-to-RUN, making sure the engine does not start and is not running.
c. The speed control indicator lamp on the instrument panel will flash once to indicate that the speed control module has entered the self test diagnostic mode. Release the OFF switch. If 5 flashes are displayed at this point, a speed control subsystem concern exists.
d. Then firmly press and release the remaining switches WITHIN 1 SECOND of each other in this sequence (On-Resume-CST-SET). The speed control indicator lamp flashes once after each of the buttons is successfully pressed.
NOTE: Monitor the PCM throttle position PID after the last button is pressed.
NOTE: There will be a slight delay from when the last button is pressed and the cluster lamp flashes diagnostic codes.
NOTE: If the self-test will not start or cannot be completed after multiple attempts, let us know.
d. A few seconds after the last button is pressed if there are any problems, the cruise control module will flash trouble codes. If the light flashes once that means the static test has passed. If it doesn't flash or flashes more than once, write down the number of times it flashed and let us know.
e. If the light flashes once, the test will continue and go into dynamic mode. In dynamic mode the module pulls the cruise control cable.
f. If the cable doesn't pull, let us know.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 15, 2012, 1:43 PM)
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