Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Code 1-4-4 (Fuel System ECU Load Signal)
Turn ignition off. Connect a voltmeter between harness side of terminal No. 8 (Yellow/Brown wire on 240; Yellow or Blue wire on 740/940) and ground. Turn ignition on. Reading should be about 0.1 volt. If reading is not 0.1 volt, check for break in wiring between electronic control units or fault in fuel system ECU.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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