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
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Fuel Pump Electrical Circuit
When ignition is first turned to the On position, without engine running, the
ECM turns the
fuel pump relay On for
2 to 3 seconds. This builds up
fuel pressure quickly. If engine is not started within
two seconds, the ECM shuts the
fuel pump Off and waits until ignition reference pulses are present. As soon as engine is cranked, the ECM turns the relay On which powers the fuel pump.