DTC ECM-4020

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.