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.
Diagnostic Trouble Code (DTC) Information
2004 Volvo V70 L5-2.4L VIN 64 B5244S6SECTION Diagnostic Trouble Code (DTC) Information
Diagnostic trouble code (DTC) information
Condition
Diagnostic trouble code (DTC) ECM-3400 is stored if the engine control module (ECM) registers that the signal from the knock sensor (KS) is higher than 3.75 V or below 1.25 V for a couple of seconds.
Substitute value
- knock control is disabled
- ignition retarded for safety reasons.
Possible source
Signal too high:
- short-circuit to supply voltage in the signal cable
- open-circuit in signal cable
- loose connections in connector
- defective knock sensor (KS).
Signal too low:
- short-circuit to ground in the signal cable
- defective knock sensor (KS).
Fault symptom[s]
Poor performance due to retarded ignition.
RENDER: 1.0x
NO RELATED
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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.