You need to include the details so I can look at the right diagrams. Is this a failure to crank problem or a crank / no-start problem? If the starter doesn't crank the engine, why was the fuel pump replaced? Is it after that service that the problem started, or was the pump an attempt to solve the problem?
If you have an automatic transmission, the neutral safety switch or range sensor is a good suspect. It's also helpful to list any clues or observations. Do the head lights, dash lights, interior lights and other systems work? Do you hear any sounds when trying to crank the engine? Those can include the light click of the starter relay, (which can be hard to hear), or a single loud clunk from the starter. Has the battery voltage been tested? Any related history that led up to this?
How are your diagnostic skills? Are you comfortable using a digital voltmeter and a test light? If not, look at these articles first:
https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
They're using an "auto-ranging" voltmeter. That's an expensive feature you don't need. Harbor Freight Tools has a perfectly fine meter for $7.00 and a nice test light for half of that. You can find them at Walmart and any hardware store too. I can help with setting up the voltmeter if you need it.
If you're ready to continue, start by measuring the battery's voltage. It should be very close to 12.6 volts if it's good and fully-charged. If you find it's closer to 12.2 volts, it's good but discharged. Charge it at a slow rate with a portable charger for a couple of hours.
Next, place the meter's probes on the cable clamps that are attached to the battery posts, not right on those posts. Have a helper try to crank the engine, then watch what happens to that voltage. It should remain above 9.6 volts, but if the starter isn't working, expect it to stay much higher, typically over 12.0 volts. If there's no change, see what happens to that voltage when a number of things are turned on. I prefer the head lights and heater fan because those draw significant current. If the voltage drops a lot, as in two or three volts, the best suspect other than a drained battery is a bad connection on one of those cable clamps.
Let me know how far you get, then we'll figure out where to go next.
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Monday, May 8th, 2023 AT 6:27 PM
