2010 Hyundai Accent won't start

90,000 MILES • 1.6L • 4 CYL • FWD • AUTOMATIC
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AUTOPRO777
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I am a journeyman mechanic. A 2010 Hyundai Accent GL Sport won't start. Ignition key on; the little amber car with the key inside is lit. I checked the oxygen sensor; 89 ohms between 2 connectors, and no connection to the third wire. There is power to the oxygen sensor. All the fuses and relays are good. 10 amp fuse to the ECU is good. There is ~ 900 ohms resistance between 2 connectors on the crankshaft sensor. There is no battery voltage to the crankshaft sensor with the ignition key on. I have made no further checks. Do you have any suggestions? Much appreciated.
Aug 20, 2015 at 1:01 AM
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KHLOW2008
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Seems like the immobilizer is locked. Try the spare key if you have one.
Aug 20, 2015 at 1:03 AM
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AUTOPRO777
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I have no spare key. I took the car to the dealership and had them reprogram the ignition key; but to no avail. Thanks.
Aug 21, 2015 at 2:43 PM
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KHLOW2008
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Were there any trouble codes?
While programming the key, was the dealer able to say if anything was wrong?
Aug 29, 2015 at 10:47 PM
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DAN AUTHIER
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I would try tracing the battery voltage for the crankshaft sensor wire back to the computer, with the high ohms there is a good possibility that you have a corroded wire that is showing continuity, but not actually carrying enough current for the sensor to operate.
No guarantee that this is your problem, but I have run into that several times in my years as a technician.
Wouldn't hurt to check out your oil sensor as well. I'll admit I have not looked into the specs on your vehicle, but I have seen a fault with the oil sensor interrupting power to the crankshaft sensor.
Jul 14, 2021 at 5:39 AM
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