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
Ref. Volts Low
Display shows Ignition Ground Voltage in volts. The
PCM keeps the voltage difference between ignition ground and PCM ground shifted by approximately
2.5 volts. The scan tool rescales the
2.5 volts to indicate
0 volts on the display. A circuit reading of
2.500 volts means the ignition and the PCM grounds are at the same level which would be displayed as
0 volts on the scan tool. A circuit reading of
1.000 volt means the ignition ground voltage is
1.5 volts lower than the PCM ground. A circuit reading of
3.500 volts means the ignition ground voltage is
1.0 volt above the PCM ground.