Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




Diagnostic trouble code (DTC) ECM-801A is stored if the voltage from the system relay to the control module is greater than 2.5 V but lower than 3 V (signal missing) or if the power supply for the control module to the electronic throttle module is lower than 8 V (faulty signal). The fault is diagnosed when the ignition is on.

Substitute value
None.

Possible source

Signal missing
- Faulty charging system
- Contact resistance in the terminals
- Open-circuit in the signal cable for the system relay
- Faulty system relay.

Faulty signal
- Faulty charging system
- Contact resistance in the terminals
- Faulty system relay.

Fault symptom[s]
- The engine fails to start
- The engine runs poorly.