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.
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HOMESERVICE MANUALSVOLVO2004V70 L5-2.4L VIN 64 B5244S6REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSECM CODES (ENGINE CONTROL MODULE)ECM-220AFAULTY SIGNAL
2004 Volvo V70 L5-2.4L VIN 64 B5244S6
Faulty Signal
2004 Volvo V70 L5-2.4L VIN 64 B5244S6SECTION Faulty Signal
Faulty signal
Checking software
Checking software
Checking software
Note! The information below only applies to modal year 2003-2004.For other model years, select the alternative "No".
It may be possible to remedy the fault by downloading new software into the control module.
Action
- Go to the tab software and program the control module with the latest software.
Other information
- For more information, see Design and Function.
Has the fault been remedied?
Yes - Fault Found
No - No Fault Found
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FAULT FOUND - Fault Found
No Fault Found - Replacing component
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Replacing component
Try a new rear heated oxygen sensor (HO2S) and select Continue when this has been done.
- To access/replace the rear heated oxygen sensor (HO2S), see Heated oxygen sensor (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing.
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components
- Start the engine and let it idle.
- Read off the value of rear heated oxygen sensor (HO2S) target voltage.
The value should increase and exceed 0.67V within 5 minutes.
Is the value OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - Fault Found
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - FAULT-TRACING FAILED
Attempt New Test - Replacing component
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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.