DTC P0078, P0084: EVT Control Magnet Retarder: Description

WARNING: This page is about a different car, the 2011 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

Exhaust valve timing control magnet retarder (1) controls the shut/open timing of the exhaust valve by ON/OFF pulse duty signals sent from the ECM.

The longer pulse width retards valve angle.

The shorter pulse width advances valve angle.

Fig 1: Identifying Exhaust Valve Timing Control Magnet Retarder

Courtesy of NISSAN MOTOR CO., U.S.A.