Spark Timing Control System: Description

The spark timing control system is designed to control distributor vacuum advance under varying driving conditions to reduce HC and NOx emissions. This is accomplished by the use of thermal vacuum valves (TVV) on all models except 200SX. In addition to thermal vacuum valves, a vacuum delay valve (one-way valve) is used on all models except 200SX, 510, and Pickup. On 200SX models, a vacuum switching valve, a water temperature switch (mounted in the radiator tank), a neutral switch (Man. Trans.), and an inhibitor switch (Auto. Trans.) are used in place of thermal vacuum valves and a vacuum delay valve.

Fig 1: Datsun 200SX Timing Control System

Courtesy of NISSAN NORTH AMERICA, INC.

Fig 2: Datsun Timing Control System (210, 310, 510, Pickup)

Courtesy of NISSAN NORTH AMERICA, INC.

Fig 3: Datsun 280ZX & 810 Timing Control System

Courtesy of NISSAN NORTH AMERICA, INC.