Diagnostic trouble code (DTC) information
Condition
Diagnostic trouble code (DTC) ECM-4020 is stored if the engine control module (ECM) registers a fault in the signal cable to the fuel tank pressure sensor.
Substitute Value
The engine control module (ECM) assumes a fuel tank pressure of 0 hPa
Possible Source
Signal too high:
- short-circuit to supply voltage in the signal cable
- open-circuit in signal cable
- defective fuel tank pressure sensor
Signal too low:
- short-circuit to ground in the signal cable
- loose connections in connector
- defective fuel tank pressure sensor
Fault symptom[s]
None.