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 L5-2.5L TURBO VIN 59 B5254T2REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSECM CODES (ENGINE CONTROL MODULE)ECM-4010SIGNAL MISSING
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2
Signal Missing
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2SECTION Signal Missing
Signal missing
Checking the status
- Ignition on.
Activate the valve in the leak diagnostic unit to check whether the fault is permanent or intermittent.
The valve clicks when it is activated.
The fault is permanent if the valve does not activate.
The fault is intermittent if the valve activates.
Continue - Checking components and wiring
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Checking components and wiring
Check the fuse before the circuit.
Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.
Check the resistance of the valve between the leak diagnostic pump connector terminals #3 and #4 (leak diagnostic unit side).
Check the signal cable between control module terminal #B40 (#B50) and leak diagnostic unit terminal #3. Check for an open-circuit.
Check the power supply cable between system relay terminal #5 and leak diagnostic unit terminal #4. Check for an open-circuit.
Remedy as necessary.
Other information:
- Checking wiring and terminals Checking Wiring And Terminals
- For resistance values, see Component specifications Specifications
- To connect the breakout box, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- For information about signals on 5 cylinder engines, see Signal specification Signal Description / Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Description / Specification
- To access or replace the leak diagnostic unit, see Leak diagnostic pump, replacing Service and Repair
- For further information about the fuses and relays, see the Wiring Diagram.
Continue - Verification
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition on
- Activate the valve in the leak diagnostic unit.
The valve should click.
Check that the function is OK.
Is the function OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - Fault Found
VERIFICATION FAILED - Fault-tracing information
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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 - Checking the status
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RENDER: 1.0x
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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.