Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-3420

Condition




The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the signal for the rear knock sensor (KS) is too high or too low.
The diagnostic is active when the engine speed is above 3000 rpm and the engine coolant temperature is above 40 °C.

Substitute value
- Safety retardation of ignition advance
- Reduced boost pressure.

Possible source

Signal too high
- Short-circuit to supply voltage in the signal cable
- Worn engine.

Signal too low
- Open-circuit in the signal cable
- Contact resistance in the terminals
- Damaged knock sensor (KS)
- Short-circuit between the knock sensor (KS) signal cables.

Fault symptom[s]
- Driving/Poor performance/lacks power