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-950CFAULTY PULSE WIDTH MODULATION (PMW) SIGNAL
2004 Volvo V70 L5-2.4L VIN 64 B5244S6
Faulty Pulse Width Modulation (PMW) Signal
2004 Volvo V70 L5-2.4L VIN 64 B5244S6SECTION Faulty Pulse Width Modulation (PMW) Signal
Faulty pulse width modulation (PWM) signal
Checking components and wiring
Check the engine control module (ECM) and accelerator pedal (AP) position sensor connectors. Check for contact resistance, play and oxidation.
Check the signal cable from accelerator pedal (AP) position sensor terminal #2 to engine control module (ECM) terminal #B25 (#B35).
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- For information about signals, see Signal specification Signal Description / Specification
- To access and replace the accelerator pedal (AP) position sensor, see Accelerator pedal (AP), replacing Service and Repair
- To fault-trace the wiring and terminals, see 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.
Activate the read off of the signals from the accelerator pedal (AP) position sensor.
Check that the value for both signals is approximately 8% when the accelerator pedal (AP) is unaffected and approximately 82% when the pedal is fully depressed.
Do the values correspond?
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 components and wiring
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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.