2.7l crank no start - Hyundai Forums : Hyundai Forum
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post #1 of 6 (permalink) Old 04-26-2019, 01:34 PM Thread Starter
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2.7l crank no start

So my 2003 2.7l is cranking but no start. This saga started with a no crank/no start situation that ended up being a bad starter. Replaced it and now it cranks beautifully but won't fire. I'm a bit of a noob when it comes to electrical stuff and I'm wondering if something was damaged when I tried to jump start the vehicle (when no crank condition first occurred), thinking it was just a bad battery.



Everything seems to be good in the under hood fuse/relay box but it seems there is no power to the 10amp ECU fuse in the under dash panel with the key in the ON position. I have a Haynes manual but it only has very basic wiring diagrams so I'm hoping somebody can tell me where this fuse gets its power. Any insight would be greatly appreciated!
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post #2 of 6 (permalink) Old 04-26-2019, 02:03 PM
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2.7L is common for CKP (Crank Position sensor) pigtail at sensor body baking and splitting and let the 3 small wires short to each other..

Sometimes it'll take out a PCM fuse (2 or 3 fuse protect PCM)... IF PCM dont know where crank is,, and that it rotating,, we not going to fire up and run

CKP been a maintain item for last number of yrs.. we used to keep couple on shelf,, not sure if we do anymore.

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post #3 of 6 (permalink) Old 04-26-2019, 04:25 PM
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Originally Posted by FixingMILscar View Post
Everything seems to be good in the under hood fuse/relay box but it seems there is no power to the 10amp ECU fuse in the under dash panel with the key in the ON position. I have a Haynes manual but it only has very basic wiring diagrams so I'm hoping somebody can tell me where this fuse gets its power. Any insight would be greatly appreciated!
The fuse should get its power from the ignition switch.
Hot when key is in run or start.

Would check to see if there is spark and fuel injector pulse
Absence of both would indicate a possible crankshaft sensor issue
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post #4 of 6 (permalink) Old 04-26-2019, 05:24 PM
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If there is no power on the PCM ignition fuse the PCM doesn't know the ignition is switched on, so it wont switch on the MAIN relay which means you wont have spark or injector pulse, or power being supplied to the PCM, fuel pump, crank position sensor, etc.
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post #5 of 6 (permalink) Old 04-26-2019, 09:14 PM Thread Starter
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Thanks for the speedy replies, Gents. After seeing sbr711’s reply, I decided to check the crank sensor. Sure enough, the sheathing near the sensor was toast, lots of exposed copper. Ran to a parts store and picked a new one up.

Should have been a quick job except the sensor snapped in half on its way out, so I spent the next 2+ hours fumbling around trying to get the remaining fragment out. Not fun. Ended up removing the O2 sensor so I could get my impact driver up in there to pump a sheet metal screw into it. After many swear words I somehow managed to break it into bits and get it all out. Installed new sensor, put it all back together and she fired right up.

I’m fairly certain now that the fuse under the dash had power all along and I just wasn’t getting the leads of my multimeter to make proper contact across the terminals. As I said before, electrical noob. Anyhow, glad to have this problem solved. Thanks again.
-Nick
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post #6 of 6 (permalink) Old 04-27-2019, 12:21 AM
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Thanks for the update.
Glad you got it fixed.
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