Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 2007 >> Expedition 4WD V8-5.4L >> Repair and Diagnosis >> Cruise Control >> Testing and Inspection >> Pinpoint Tests >> Test A: The Speed Control Is Inoperative
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Test A: The Speed Control Is Inoperative

PINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE


A1-A4:






A5-A7:






Normal Operation
The powertrain control module (PCM) sends a signal through circuit VES10 (WH) to the speed control switches, which passes through the clockspring. The return signal is sent to the PCM through circuit RES08 (GN/BN) and the clockspring. When the brake pedal is applied, voltage is routed to the PCM to deactivate the speed control, if engaged.

The speed control deactivator switch interrupts circuit CES09 (VT/OG), removing the voltage signal to the PCM when the brake pedal is applied. This is a redundant signal to the PCM.

Possible Causes
- Stoplamp switch
- Speed control switch
- Digital transmission range (TR) sensor
- Vehicle speed signal
- PCM
pro multis · About Operation CHARM