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

CID1 - CID Signal



- Key Off.

- Install Breakout Box (connect PCM).

- Measure the voltage at Test Pin CID while bumping the starter.

- Does the voltage alternate between approximately 0 volts and 5 volts?

Yes -- CID circuit OK.

If sent to this test by the Component Verification Test, Return to Diagnostic Routines. Testing and Inspection

Otherwise, Replace the PCM.

No -- Go to CID2. CID2 - VPWR to Distributor