Question about Ford Cars & Trucks
No . your best bet , take it to a qualified repair shop.
The speed control system is controlled by the powertrain control module (PCM). The speed control system is designed to maintain a selected vehicle speed between 48 and 200 km/h (30 and 124 mph). The speed control system is controlled by the steering wheel mounted switch(es) (ON, OFF, SET/ACCEL, COAST, RESUME), and the brake pedal switches (stoplamp and speed control deactivator switches). The steering wheel mounted switch(es) are hardwired to the PCM through the clockspring.
The speed control functions include:
Tapping the SET/ACCEL or the COAST switch while in the set mode respectively, increases or decreases the maintained vehicle speed by 1.6 km/h (1 mph) per tap. If the respective button is pressed and held, the vehicle speed continues to accelerate or decelerate until the button is released.
Pressing and releasing the OFF switch, or turning the ignition switch to the OFF position, turns the speed control system off. Pressing the brake pedal puts the speed control system into the STANDBY mode. Pressing the RESUME button, when the speed control system is in the STANDBY mode causes the vehicle to accelerate to the last set speed. Resume does not function if the OFF button is pressed, the ignition switch is in the OFF position, or if the current vehicle speed is below the minimum operational speed.
Whenever the speed control system is engaged and active, a speed control icon on the instrument cluster is illuminated.
NOTE: The speed control deactivator switch is provided as an additional safety feature. Normally, when the brake pedal is applied, an electrical signal is sent from the stoplamp circuit to the PCM to release the throttle. Under increased brake pedal effort, the speed control deactivator switch opens and removes the voltage signal from the PCM input circuit, deactivating the speed control system.
NOTE: The clockspring provides the electrical interface between the steering column wiring and the speed control switch(es) in the steering wheel.
The inputs to the PCM are:
When the speed control system is active, the PCM corrects for deviations in the actual vehicle speed by proportionally moving the throttle plate. The PCM modulates the throttle to minimize error between the actual vehicle speed and the desired speed.
The PCM strategy uses the throttle control for smooth accelerations.
The PCM sends a serial message over the controller area network (CAN) to the instrument cluster whenever the speed control telltale should be turned on or off.
In the event of an OFF command or a deactivation request from the speed control deactivator switch, the speed control system carries out a hard deactivation and immediately returns the throttle to the idle position.
The speed control system provides self-diagnostics. Speed control is disabled anytime an error is detected in the system. No instrument cluster telltale or message center messages are displayed when faults occur. Fault codes are logged by the PCM.
An ETC system fault also causes the speed control system to be disabled. In this case, an ETC system warning telltale (wrench light) or a message center message is displayed.
Additionally, the following conditions causes the speed control system to deactivate:
Inspection and Verification
WARNING: If equipped with fire suppression system, refer to Section 419-03 for important safety warnings.
Visual Inspection Chart Mechanical Electrical
Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) Index DTCs Description Source Action P0500 Vehicle Speed Error PCM REFER to Section 307-01 . P0579 Cruise Control Multi-Function Input A Circuit Range/Performance PCM Go To Pinpoint Test C . P0581 Cruise Control Multi-Function Input A Circuit High PCM Go To Pinpoint Test C . P0720 Insufficient Input from Output Shaft Speed Sensor PCM REFER to Section 307-01 . P0721 Noise Interference on Output Shaft Speed Sensor Signal PCM REFER to Section 307-01 . P0722 No Signal from Output Shaft Speed Sensor PCM REFER to Section 307-01 . P1572 Brake Pedal Switch Circuit PCM Go To Pinpoint Test B . P1703 Brake Switch Out of Self-Test Range PCM Go To Pinpoint Test B .
Posted on Feb 20, 2019
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
You can purchase the wiring diagram for $5.99 from the following site: http://www.wiring-diagram.com/. You can also purchase a wiring diagram book from the following link: http://cgi.ebay.com/ebaymotors/2008-FORD-CROWN-VICTORIA-MARQUIS-WIRING-DIAGRAM-MANUAL_W0QQitemZ120394723100QQcmdZViewItemQQimsxZ20090320?IMSfp=TL090320147007r15080.
Hope this helps,
Posted on Mar 23, 2009
Firing order is 1-3-7-2-6-5-4-8 Passenger side of engine starting at front and going back is 1-2-3-4 Driver's side starting at front going back is 5-6-7-8.
Posted on Jul 06, 2009
Tips for a great answer:
Sep 20, 2014 | 2000 Ford Crown Victoria
Jan 16, 2014 | 2008 Ford Crown Victoria
Sep 01, 2011 | 2008 Ford Crown Victoria
Aug 18, 2010 | 1999 Ford Crown Victoria
Aug 12, 2009 | 1993 Ford Crown Victoria
Jun 27, 2009 | 1988 Ford Crown Victoria
Mar 23, 2009 | 2008 Ford Crown Victoria
26 people viewed this question
Usually answered in minutes!