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-2000SIGNAL TOO LOW
2004 Volvo V70 L5-2.4L VIN 64 B5244S6
Signal Too Low
2004 Volvo V70 L5-2.4L VIN 64 B5244S6SECTION Signal Too Low
Signal too low
Checking the status
- Ignition on.
Check whether the fault is permanent or intermittent by reading off the signal from the engine coolant temperature (ECT) sensor.
Check that the signal is within its permitted range.
The fault is permanent if the signal is incorrect. The fault is intermittent if the signal is correct.
Continue - Checking the component and wiring
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Checking the component and wiring
Check the signal cable between engine control module (ECM) terminal #A40 (#A40) and engine coolant temperature (ECT) sensor terminal #1. Check for an open-circuit. Check for a short-circuit to ground.
Check the ground lead between engine control module (ECM) terminal #A61 (#B3) and engine coolant temperature (ECT) sensor terminal #2. Check for an open-circuit.
Remedy as necessary.
Other information
- Connecting the breakout box Connecting the Breakout Box
- Signal specification Signal Description / Specification
- Engine coolant temperature (ECT) sensor, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals
Continue - Verification
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off the signal from the engine coolant temperature (ECT) sensor.
Check that the signal is within its permitted range.
Is the signal within its permitted range?
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 - Checking the status
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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.