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Throttle Switch

Switch is set on bellcrank of accelerator linkage and operates together with accelerator pedal. Switch is ON when throttle is opened wide.

  Throttle SW Fourth gear SW Spark timing
"Advance" "Retard"
Engine start ON ON -
Idling ON ON -
4-speed gear Partial O.T. ON OFF -
Wide O.T. OFF
Except 4-speed gear Partial O.T. ON ON -
Wide O.T. OFF -

3SM207 

SPARK CONTROL SYSTEM OPERATION (MANUAL TRANS.) 

Fig 1: BOOST CONTROLLED DECELERATION DEVICE
G09355035Courtesy of NISSAN NORTH AMERICA, INC.