Diagnostic Trouble Code (DTC) Information

Condition

Fig 1: Identifying Air Distribution Valve

Courtesy of VOLVO CARS OF NORTH AMERICA.

If the idle condition is fulfilled and idle has deviated from the tolerance (normal idle -100 to +200 RPM), diagnostic trouble code ECM-620A is generated in the engine control module (ECM).

Substitute Value

None.

Possible Source

Idle speed too high:

the engine load at idle speed has suddenly decreased (for example, a large power consuming component has been switched off).

Idle speed too low:

the engine load at idle speed has suddenly increased (for example, when the steering wheel is turned sharply).

Fault symptom[s]

None.