VOLVO
ECM-918F - Accelerator pedal (AP) position sensor. Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008)
Show models by year and engine (20)
- Volvo C70 Cabriolet (1998–2005)2000Engine B5244S only
- Volvo C70 Coupé (1998–2002)1999Engine B5254S DENSO only
- Volvo C70 Coupé (1998–2002)2000Engine B5244S only
- Volvo S60 (2001–2009)2001Engine B5244S, B5244S2 only
- Volvo S60 (2001–2009)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2003–2005Engine B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2006–2008Engine B5244SG only
- Volvo S70 (1997–2000)1999Engine B5254S DENSO only
- Volvo S70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)1999–2000Engine B5244S, B5244S2 only
- Volvo S80 (1999–2006)2001Engine B5244S, B5244S2, B5244SG only
- Volvo S80 (1999–2006)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)2003–2005Engine B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)2006Engine B5244SG only
- Volvo V70 (1997–2000)1999Engine B5254S DENSO only
- Volvo V70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2001Engine B5244S, B5244S2, B5244SG only
- Volvo V70 (2000–2008)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2003–2005Engine B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2006–2008Engine B5244SG only
What does this fault code mean?
The throttle unit (ETM) has detected that the PWM signal from the accelerator pedal sensor lacks signal changes for a period of time. The engine control module (ECM) then stores the code. It can be set together with other fault codes, and the root cause may be among them.
Possible causes
- Power supply to the pedal sensor is missing
- Signal cable short-circuited to voltage
- Signal cable short-circuited to ground
- Open circuit in the signal cable
- Loose connections
- Defective accelerator pedal sensor
What you can do
- 1Read off whether other fault codes for the accelerator pedal signal are stored, such as ECM-9520 or ECM-951F, and troubleshoot those first if so
- 2Check the connector at the accelerator pedal sensor and the engine control module for loose connections and oxidation
- 3Use a multimeter to check that the signal cable from the accelerator pedal sensor has no open circuit and is not short-circuited to ground or voltage
- 4Check that the accelerator pedal sensor receives power from its supply and that the battery is well charged
- 5Erase the fault code and test drive. If it returns, have a workshop check the accelerator pedal sensor, and ask whether upgraded software is available for the car
Symptoms you may notice4
- The idle is uneven
- The car jerks during engine braking
- Throttle response is very poor
- Top speed is reduced
What the fault can affect3
- The throttle closes when braking, and pedal input is ignored while the brake is pressed
- Throttle motor control is switched off, the throttle moves to its mechanical stop position and engine speed is controlled by fuel cut-off
- Uneven idle in this state is due to the reconfiguration and should not be mistaken for a driveability fault that was there before
General guidance for car owners. Diagnosis on the car can point to a different cause.