Service Done Right #14: Troubleshooting Relay Controlled Circuits

The engine control module operates a number of electrical components in order to carry out its programming. Some of these components draw a lot of current – more than what the internal drivers of the ECM can handle. When that’s the case, the ECM uses an intermediary to turn the component on and off – the relay. Troubleshooting relay-controlled circuits is the topic of today’s Service Done Right! Learn more about our sponsor at my.advancepro.com!