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

Test Notes

NOTE: You should enter this pinpoint test only when directed here from Pinpoint Tests C, J, or PA.

To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault:
- Ignition switch
- Battery cables
- Generator
- Voltage regulator
- Ground straps

This pinpoint test is intended to diagnose only the following:
- Harness circuits: SIG RTN, PWR GND, VPWR, KAPWR, IGNITION SWITCH
- Battery positive voltage (B+)
- EEC power relay
- Powertrain Control Module (PCM)