Knock Retard Operation

Since engine is engineered to prevent engine knocking, retard system does not work under normal operating conditions. However, if engine knock occurs, knock sensor monitoring knocking condition sends a signal to ECM. After receiving signal, ECM retards ignition timing to eliminate knocking condition. G20 and J30 are equipped with one knock sensor each, located below injector rail on G20 and between cylinder banks, below intake manifold on J30. Q45 is equipped with 2 detonation sensors, one for each bank of cylinders.