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 MANUALSVOLVO2003V70 2.4 L5-2.4L VIN 61 B5244SREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSECM CODES (ENGINE CONTROL MODULE)ECM-6400SIGNAL MISSING
2003 Volvo V70 2.4 L5-2.4L VIN 61 B5244S
Signal Missing
2003 Volvo V70 2.4 L5-2.4L VIN 61 B5244SSECTION Signal Missing
Signal missing
Status check
Reading off the status of the diagnostic trouble code (DTC)
Engine control module (ECM)
Reading off the status of the diagnostic trouble code (DTC):
Note! When reading off the DTC status, other stored diagnostic trouble codes (DTCs) and their status will also be listed.
- Start the engine. Let it idle for at least 15 seconds.
- Read off the diagnostic trouble code (DTC) status. Check the status of the relevant diagnostic trouble code (DTC).
Was the status of the relevant diagnostic trouble code (DTC) permanent?
Yes - PERMANENT
No - INTERMITTENT
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PERMANENT - Checking the wiring
INTERMITTENT - Intermittent fault
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Checking the wiring
Check the resistance between connector terminal #1 and terminal #2 on the camshaft reset valve. The resistance must be approximately 3.7 ohms.
Check the signal cable between engine control module (ECM) terminal #A12 and connector terminal #2 (on the camshaft reset valve). Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access and replace the camshaft reset valve, see Variable valve timing solenoid, replacing Removal and Replacement
- With the ignition on and the reset valve connector disconnected, the voltage at connector #1 must be approximately Ubat and at connector terminal #2 it must be a pulse modulated signal with a peak voltage of approximately Ubat and with a frequency of approximately 250 Hz
- For information about signals, see Signal specification Signal Description / Specification.
Continue - Verification
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Intermittent fault
Signal missing. Intermittent fault
Checking wiring and connectors
Check the signal cable between engine control module (ECM) terminal #A12 and connector terminal #2 (on the camshaft reset valve). Check for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the power supply cablenbsp;terminal #5 and connector terminal #1 (on the camshaft reset valve). Check for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access and replace the camshaft reset valve, see Variable valve timing solenoid, replacing Removal and Replacement
- With the ignition on and the reset valve connector disconnected, the voltage at connector #1 must be approximately Ubat and at connector terminal #2 it must be a pulse modulated signal with a peak voltage of approximately Ubat and with a frequency of approximately 250 Hz
- For information about signals, see Signal specification Signal Description / Specification.
Continue - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - Fault Found
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Attempt New Test - Checking wiring and connectors
FAULT FOUND - DONE
DONE - DONE
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DONE - DONE
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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.
- Start the engine
- Check that the actual and desired values for the reset valve are approximately the same. Increase the engine speed slightly if required.
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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Attempt New Test - Status check
FAULT-TRACING FAILED - FAULT-TRACING FAILED
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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.