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-950CDIAGNOSTIC TROUBLE CODE (DTC) INFORMATION
2003 Volvo V70 2.4 L5-2.4L VIN 61 B5244S
Diagnostic Trouble Code (DTC) Information
2003 Volvo V70 2.4 L5-2.4L VIN 61 B5244SSECTION Diagnostic Trouble Code (DTC) Information
Diagnostic trouble code (DTC) information ECM-950C
Condition
The engine control module (ECM) checks the pulse width modulation (PWM) signal and the analog signal from the accelerator pedal (AP) position sensor.
Diagnostic trouble code (DTC) ECM-950C is stored in the engine control module (ECM) if the engine control module (ECM) registers a fault in the signals from the accelerator pedal (AP) position sensor.
Diagnostic trouble code (DTC) ECM-950C can be diagnosed when the ignition is on.
Substitute value
- Filtered accelerator pedal signal when accelerating
- Acceleration is ignored when braking
- In the event of a detected fault in one of the signals the other signal is used.
Possible source
Analog signal too high:
- Short-circuit to supply voltage in the analog signal cable
- Defective accelerator pedal (AP) position sensor.
Analog signal too low:
- Short-circuit to ground in the signal cable
- Open-circuit in the signal cable
- Open-circuit in analog ground
- Open-circuit in the power supply
- Defective accelerator pedal (AP) position sensor.
Pulse width modulation (PWM) signal too high:
- Short-circuit to ground in the signal cable.
Pulse width modulation (PWM) signal too low:
- Short-circuit to ground in the signal cable
- Short-circuit to supply voltage in the signal cable
- Open-circuit in the signal cable
- Open-circuit in the power supply
- Open-circuit in the ground lead
- Defective accelerator pedal (AP) position sensor.
Faulty pulse width modulation (PWM) signal:
- Loose connections or contact resistance in the terminals on the pulse width modulation (PWM) signal cable
- Interference on the pulse width modulation (PWM) signal cable
- Defective accelerator pedal (AP) position sensor.
Comparison fault:
- Loose connections or contact resistance in the terminals on the analog signal cable
- Fault in the power supply to the analog signal
- Fault in analog ground
- Fault in the pulse width modulated signal cable between the engine control module (ECM) and the accelerator pedal (AP) position sensor
- Defective accelerator pedal (AP) position sensor.
Fault symptom[s]
- Poor accelerator pedal (AP) response
- The accelerator pedal (AP) is ignored when braking.
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.