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 the PCM Power and Ground Circuits

Tests 1 - 3:





SYMPTOM
CHECKING THE PCM POWER AND GROUNDS

POSSIBLE CAUSES
- Fused ignition switch output circuit open
- PCM ground circuit(s) open
- Fused B(+) circuit less than 10.0 volts