The crank no start issue in the 2015 Jeep Patriot is caused by a lack of power to the ASD main relay.
Checking for spark and fuel is essential when troubleshooting a crank no start issue.
Scanning for codes can provide valuable information about the issue.
Inspecting the ASD main relay can help identify potential problems.
A poor connection on the fuse can cause the ASD main relay to not receive power, resulting in a crank no start issue.
What are the common causes of a crank no start issue?
—Common causes of a crank no start issue include a faulty ignition switch, a bad fuel pump, no spark, or a problem with the fuel injectors.
How do you check for spark in a vehicle?
—To check for spark, you can use a spark tester or remove a spark plug and ground it to the engine while cranking the engine to see if a spark is produced.
How do you check for fuel in a vehicle?
—To check for fuel, you can listen for the fuel pump whirring when you turn the key to the ON position or use a fuel pressure gauge to measure the fuel pressure.
What is the ASD main relay and what does it do?
—The ASD (Auto Shutdown) main relay is responsible for powering various systems in the vehicle, including the fuel pump, ignition coil, and injectors. It is controlled by the vehicle's PCM (Powertrain Control Module).
Why is a poor connection on a fuse a potential issue?
—A poor connection on a fuse can prevent power from reaching certain components, such as the ASD main relay, causing them to not function properly.
00:01Introduction to the video and the 2015 Jeep Patriot concern.
00:15Observations of the engine cranking and initial analysis.
01:00Connecting the diagnostic tools and scanning for codes.
02:00Exploring the ASD main relay and potential issues.
09:00Troubleshooting the power supply to the relay and finding a poor connection on the fuse.
12:00Testing the relay after fixing the connection issue and confirming a successful start.
