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-9818FAULTY SIGNAL
2003 Volvo V70 2.4 L5-2.4L VIN 61 B5244S
Faulty Signal
2003 Volvo V70 2.4 L5-2.4L VIN 61 B5244SSECTION Faulty Signal
Faulty signal
Checking components and connections
Note! If there are other diagnostic trouble codes (DTCs) stored in the engine control module (ECM), these must be fault traced first.
- Ignition on
- Activate the smart tool to read off the ranking values
- Check the ranking values for the diagnostic trouble codes (DTCs) listed in the smart tool by marking the relevant code.
This diagnostic trouble code (DTC) indicates that the throttle is stuck in the open position. This may have caused the reduction the brake vacuum.
To determine the fault which has caused the throttle to stick in the open position, read off the ranking values. By looking at the ranking values, the fault can be found even though no diagnostic trouble code (DTC) is stored. For further information about the ranking values, see Ranking values Ranking Values.
During this fault-tracing, the smart tool reads off the ranking values for diagnostic trouble code (DTC) ECM-91AC. This diagnostic trouble code (DTC) has fault causes which may have led to reduced braking power.
The ranking values vary between 0 and 255. If the diagnostic trouble code (DTC) has a ranking value above 128, fault-trace using the standard procedures.
Continue - Verification
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Verification
Information
Fault-tracing information
In case of this defect, troubleshooting is not followed by verification.
The information can be displayed again or the fault-tracing for this fault can be interrupted.
Do you want to view the information again?
Yes - Attempt New Test
No - Fault Found
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Attempt New Test - Checking components and connections
FAULT FOUND - 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 components and connections
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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.