Inhbitor Relay in the Starter Solenoid Circuit
1992 Nissan Sentra XE, GA16DE, Engine Code "E"
I turned to my Haynes manual to study the starter. The text mentioned the manual
I went to my Nissan subscription at All Data.com and there I discovered that this car
Next I checked the wiring diagram in the back of the Haynes manual and sure enough
Next, I began searching the engine compartment for the inhibitor relay.
The inhibitor relay is the last relay in the relay box, to the right of the white line that I added to the picture.
The relay box was easy to open. It has plastic snaps at each end of the box cover.
The inhibitor relay is gray. It
is held in place with a plastic snap. Use a small screwdriver to force the snap away from the housing, while pulling the relay upward.
I was fortunate. See the small Phillips head screw in the bottom of the relay?
It is possible that the screw had nothing to do with the relay working. It's possible that simply removing and replacing the relay caused the relay to make connection that had failed over time. Anyhow, the screw is in, the relay is in, and the starter works.
There are tests that can be done to find if a relay is working. You need to follow a diagram
and use an ohmmeter and a voltage source to do the testing. That goes beyond this single
Posted October 14, 2008
Public Notice: there are several handyman do-it-yourself items on this Web site that require some care when using them or the tools and/or electricity when constructing them. I offer my ideas freely and if you use any of these ideas you are responsible for all aspects of that use. If you attempt to construct and/or use any of these items, you do so at your own risk. Thank you, Doug Dickens.
There are two diagrams below. The first one is for a 1992 Sentra that uses the
The second diagram is for a 1992 Nissan that uses the Inhibitor Switch without
(ABOVE) If for any reason the Mechanical Switch is not closed, the 12 volt Relay will not have a path to ground and the Inhibitor Relay will not allow current to flow to the starter solenoid. When adjusted correctly, the Mechanical Switch Contacts are closed in only Park and Neutral.
So both the switch and the relay must be closed for the starter solenoid to operate.
(BELOW) In this circuit, there is no 12 volt Relay. You have a Mechanical Switch only, which is closed in Park and Neutral to furnish current to the starter solenoid.