Operation CHARM: Car repair manuals for everyone.
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

Checking Speed Control On/Off Switch

Tests 1 - 5:




Tests 6 - 9:




SYMPTOM
SPEED CONTROL ON/OFF SWITCH

POSSIBLE CAUSES
- Ground circuit open
- Speed control SET/RESUME switch voltage > 4.0 volts
- Speed control switch signal circuit shorted to voltage
- Speed control switch signal circuit shorted to ground
- Speed control ON/OFF switch voltage < 1.0 volt
- Speed control ON/OFF switch voltage > 4.0 volts
- PCM defective (ground circuit open)
- Powertrain control module defective (S/C switch to ground)