Diagnostic Trouble Code (DTC) Information ECM-801A

Condition

Fig 1: Identifying Battery

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the voltage from the system relay to the engine control module (ECM) is below 3 V (Signal missing) or if the power supply from the engine control module (ECM) to the throttle unit is below 8 V (Faulty signal).

The diagnostic trouble code (DTC) 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
Damaged system relay.

Faulty signal

Faulty charging system
Contact resistance in the terminals
Damaged system relay.

Fault symptom[s]

The starter motor does not turn
The starter motor turns but the engine does not start
The engine runs poorly.