The check engine light is not controlled by a relay, the bulb is grounded directly by the engine computer.
The main relay will give an check engine light to indicate that the electrical system is bad.
It means that your relay is out, and has to be replaced with a new one, and once its been replaced, your check engine light will turn off in about 20 minutes or so.
Engine compartment fuse box
Theres a relay on the passenger side engine compartment.
By drivers side head light
In the relay/fuse box in front of the battery,small 10amp fuse and 30 amp relay at engine end off relay/fuse block
Where is the fuel pump RELAY on a 1992 Jeep Wrangler
The check engine light on any vehicle will come on if any SENSOR is malfunctioning or just gone bad- They relay information to the computer-which notifies the driver GET A DIOGNOSTIC CHECK FOR THAT LIGHT Autozone is not the best .....but it's free
The wiper relay on a 98 Wrangler is located under the hood. It is in the relay/fuse housing on the passenger side of the car.
There is a fuel pump relay in the fuse box in the engine compartment.
Check fuse. If good then check if you have power to motor (just need a 12 volt test light) If there is power then need fan motor-if no power check the relay. power to relay then you have found the problem. Relay is in the engine compartment on pass side of firewall. 95% of time the relay is out
The 2001 Jeep Wrangler turn signal flasher relay switch can be located beneath the dashboard. The switch will be on the drivers side of the engine compartment.