Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 2008 >> E 250 V8-4.6L >> Repair and Diagnosis >> Cruise Control >> Testing and Inspection >> Pinpoint Tests >> Test C: Speed Control Switch Stuck Or Circuit Failure
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 C: Speed Control Switch Stuck Or Circuit Failure

PINPOINT TEST C: SPEED CONTROL SWITCH STUCK OR CIRCUIT FAILURE

Normal Operation
The 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.







This pinpoint test is intended to diagnose the following:
- Wiring, terminals, or connectors
- Clockspring
- Speed control switch
- PCM


C1-C2:






C2-C3:






C3-C4:






C4-C5:






C5-C6:






C6-C7:






C7-C8:






C9-C10:






C10-C11:




pro multis · About Operation CHARM