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

XB144 - Does Engine Start With HFP Relay Disconnected

- Key "OFF".

- Disconnect High Speed Fuel Pump (HFP) relay (located in Power Distribution Box).

- Attempt to start engine and run for one minute.

- Does the engine start and run for one minute?

Yes -- Reconnect HFP relay. Go to XB127 (to check left Heated Oxygen Sensor (HO2S) for short to power). XB127 - Check Left HO2S For Short to Power

No -- Go to XB145. XB145 - Check For B+ to VCRM (Pins 4 and 5)