Diagnostic trouble code (DTC) information ECM-301A
Condition
The engine control module (ECM) checks the signals from the camshaft position (CMP) sensor on the exhaust side.
When the engine speed (RPM) exceeds 500 rpm the control module assumes that the camshaft position (CMP) sensor will make 5 flank changes during each crankshaft revolution. Faults can be counted 19 times within 200 engine rotation intervals before the engine control module (ECM) interprets this as a fault and stores ECM-301A.
Diagnostic trouble code (DTC) ECM-301A can be diagnosed when the engine is running.
Substitute Value
- The transmission input speed sensor is used if it is working.
Possible Source
- Contact resistance
- Incorrectly adjusted camshafts
- Short-circuit to supply voltage in the signal cable
- Defective camshaft position (CMP) sensor on the exhaust side.
Fault symptom[s]
- Engine difficult to start
- The engine misfires.