Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-640A

Condition




The engine control module (ECM) checks that the actual camshaft angle position (actual value for the camshaft shift angle) corresponds to the requested angle position (target value for the camshaft shift angle). The diagnostic trouble code (DTC) is stored if the value for the actual camshaft angle position is higher (signal too high) or lower (signal too low) than the control module target value for the camshaft angle position.
The diagnostic is active when the engine is running, engine at operating temperature.

Substitute value
- None.

Possible source

Signal too high
- Poor engine oil quality
- Damaged camshaft reset valve
- Mechanical fault in the continuous variable valve timing (CVVT) unit.

Signal too low
- Short-circuit to supply voltage in the signal cable
- Poor engine oil quality
- Damaged camshaft reset valve
- Mechanical fault in the continuous variable valve timing (CVVT) unit.

Fault symptom[s]
- Malfunction indicator light (MIL), on
- Uneven idle
- High emissions
- The engine cuts out when driving.