The functionality of the neutral safety switch has changed greatly through the automotive development era, what was once a simple switch for the reverse lights and starter safety circuits, this switch has now become a multi-function gear position sensor which provides feedback data to the body and engine computers, all related functions are then carried through the operating system. The neutral safety switch disables the starter operation when the vehicles transmission is not in neutral or park, and are equipped on automatic transmission vehicles only.
A standard transmission car utilizes and clutch safety switch in place of the neutral safety switch which accomplishes the same objective. When a neutral safety switch fails it can cause the starter or reverse lights not to operate. Other complications can occur if a loose connection exists near the wiring connector, confirm this connection by removing the connector and reconnecting it.
If the starter is not working when the vehicle is in park, try pushing down on the brake pedal and putting the transmission in neutral, this will bypass the park circuit of the switch allowing the starter to operate if the park circuit has failed.
If a neutral safety switch becomes maladjusted, it can cause the switch to malfunction, confirm the adjustment of the switch.
Identify the neutral safety switch which is located on the left side of the transmission
and controls engine starter operation along with reverse lights and gear selection
feedback data used by the computer.
Obtain a wiring diagram used to trace wires which enables continuity testing.
This switch uses a simple grounding procedure to individual circuits when the switch
is activated. Search Google
images or an online service manual such as
Mitchell1 to obtain such diagram.
Using a test light
will enable the circuit testing by piercing the wires to confirm a connection through
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