VOLVO
ECM-B100 - Gas system. Shut-off valve
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS70 (1997–2000), V70 (1997–2000)
Show models by year and engine (2)
What does this fault code mean?
The engine has been running on a mixture that is too rich while the fuel shut-off was active, and the engine control module treats this as a fault. The fault may lie in the fuel rail, its wiring or the shut-off valve. Gas operation is blocked while the fault is present.
Possible causes
- Contact resistance in the connector to the fuel rail
- Defective relay in the relay and fuse centre
- Open circuit in the wiring
- Defective fuel rail
- Defective deceleration fuel cut-off valve
What you can do
- 1Read the code with the ignition on and check whether it is active
- 2Check the connectors to the fuel rail and the shut-off valve for contact resistance and oxidation
- 3Check the wiring for open circuits and chafing; if anything is loose, secure it and read the code again
- 4If the connectors and wiring are sound, the fuel rail, the relay or the shut-off valve is at fault; have a workshop check them
Symptoms you may notice3
- The car cannot run on gas
- Rough or unsteady idle
- Reduced drivability
What the fault can affect1
- Gas operation is blocked
General guidance for car owners. Diagnosis on the car can point to a different cause.