Please Help, Need info on crank position sensor!

[jeffm1515]

Well I feel stupid right now. I just installed a freshly rebuilt LTR motor in my 02 Xstar. I have everything hooked up or I thought. I tried firing up but have no spark. I started searching around and found I don't have crank sensor hooked up. I can not locate any spare wires anywhere. Can somebody please look at their motor and tell me where the wires come from please.

[jeffm1515]

Just installed rebuilt LTR Motor in 02 Xstar. I have some how lost the crank sensor wire. ??? Can someone tell me where it come from so I can start there. I can not find no spare wires anywhere under motor. Or a wiring diagram would be helpful. Thanks

[jeffm1515]

Well motor froze this winter. So I had it rebuilt and just installed it. Tried to fire it up but had no spark. Found I had nothing plugged into crank sensor. However I don't see any wires under motor that arent already plugged in. Can someone please tell me where to look. I have looked everywhere. LTR 330 HP with Norhtstar Ignition.

Jeff

[76S&S]

I have the same boat/motor combo but it is at the lake. I can look this weekend.

[jeffm1515]

That would be great. If you can just follow wire backas far as possible so I have a starting point to look again.

[jeffm1515]

How does Northstar ignition work? Motor cracked this winter I found out upon starting engine up first time this year and pumped engine full of water. So I had a new motor built and I installed it but continue to have no spark. Any ideas? Also there is a sensor located at bottom of timing cover, is there suppose to be a wire hooked up on this model LTR 5.7 L?

[dummy]

Northstar ignition is a factory crank-trigger ignition. It uses 2 CPS sensors located at the harmonic balancer on the front of the engine. The CPS sensors magnetically read information from non-symmetrical grooves at the crank pulley to determine piston location within the bore, which tells the coils when to fire the plug.

My LTR-powered is covered up at the moment, but if you search CPS sensor here I'm sure you'll find at least one photo of the CPS sensors.

[jeffm1515]

Okay but where can I check to see if I am getting a signal? Does anyone know what wire connections are in ignition harness plug at North star unit

[jeffm1515]

How do you check crank positioning sensor on Northstar LTR motor? I need to make sure they are reading crank. Thanks

[jeffm1515]

I have no spark on 2002 Xstar with LTR motor and northstar ignition any ideas?

[JimN]

I have no spark on 2002 Xstar with LTR motor and northstar ignition any ideas?

Press on the center of the safety switch with the clip in place. If you never remove the lanyard, the plastic will deform and decrease its pressure on the switch.

[Chief]

I have no spark on 2002 Xstar with LTR motor and northstar ignition any ideas?

Check the sensors around the crankshaft, if they are heavly rusted then you could be losing the spark there. I think thats where the coil packs get the signal to fire when the engine is turning. I'm looking for some old documents I had because I had a MC with the LTR once.

And what JimN said, he's the man!

http://i224.photobucket.com/albums/dd25/AJxtcman/Ignition%20systems/EI.gif

[Chief]

How do you check crank positioning sensor on Northstar LTR motor? I need to make sure they are reading crank. Thanks

I would start at the cam position sensor if the lanyard switch is good. Simple first! There is a resistance reading, but I'm looking for it. Do you have a multimeter? Also check all of your fuses!

http://i224.photobucket.com/albums/dd25/AJxtcman/Ignition%20systems/EI.gif

[jeffm1515]

Is the cam sensor at the bottom of timing cover? Yes I have a multimeter and have ohmed out CPS sensors. Where would the fuse be? I have 2002 Xstar. On my ICM I have a large plug and small plug hooked into bottom of ICM and a large plug hooked into top that goes down to CPS sensors.

[jeffm1515]

[QUOTE=Chief;684365]Check the sensors around the crankshaft, if they are heavly rusted then you could be losing the spark there. I think thats where the coil packs get the signal to fire when the engine is turning. I'm looking for some old documents I had because I had a MC with the LTR once.

And what JimN said, he's the man!

Literally all connections look brand new. I am wondering if there is suppose to be something plugged into the sensor at the bottom of the timing cover. I dont see any loose wires or plugs laying down there.

[jeffm1515]

There is a sensor at the bottom of my timing cover that is not plugged into anything. Should it be? 02 xstar LTR 5.7L with northstar ignition. I have no spark.

[dummy]

Should be 2 CPS (crank position sensor) sensors there. At least there are on my '00 LRT with Northstar ignition. Until you find your wiring harness leads and get those sensors plugged in I don't believe you're going to get any spark regardless of fuses, lanyards, etc.

I'll see if I can get into my boat to look for you where the CPS sensor wiring stems from. If you pulled your engine yourself you must've unhooked 'em or set them aside. I'd check from the ICU with the coil packs and see if there isn't some wiring tucked up under there. I'll head outside now to crack the cover on my boat.

[jeffm1515]

Okay I have the CPS sensors hooked up and I have no spark no matter which way I hooked them up I tried swapping wires on sensors. I have found a sensor at the bottom of timing cover that is not plugged in to anything. Can you please check this sensor? I dont see any wiring I missed.

[jeffm1515]

Press on the center of the safety switch with the clip in place. If you never remove the lanyard, the plastic will deform and decrease its pressure on the switch.

I have bypassed the lanyard. And that has not cured problem. Everything was running fine 3 weeks ago until I noticed a crack in the side of engine block and pulled motor for rebuild with new block.

[dummy]

So you found your CPS harness? Looks like it's a short (12-18 inch long) lead that connects the 2 CPS sensors to the ICU on the front of the engine. The connector hooks into the top of the ICU and runs down to the twin CPS sensors. Is that where you plugged it in?

There's also a portion of the harness that runs along the intake manifold and injector wiring and then comes down and hooks into the bottom of the ICU. Your injectors must be plugged in, so I assume you've got this one already hooked up.

[jeffm1515]

So you found your CPS harness? Looks like it's a short (12-18 inch long) lead that connects the 2 CPS sensors to the ICU on the front of the engine. The connector hooks into the top of the ICU and runs down to the twin CPS sensors. Is that where you plugged it in?

There's also a portion of the harness that runs along the intake manifold and injector wiring and then comes down and hooks into the bottom of the ICU. Your injectors must be plugged in, so I assume you've got this one already hooked up.


Yes that is exactly what I have hooked up like. Now the only thing left unhooked is on other side right below waterpump at bottom of timing chain cover kinda behind alternator. does your s have something hooked up there? Thanks again for you help.

[dummy]

Sounds like the Crank Position Sensor. I believe you need that as well for spark. I'll check when I get a minute.

(edit - can't really see any sensor up top other than the water temp sensor on the water pump above the alternator bracket. I'd have to dig out my wakeboards and undo the lift actuator to drop the engine panel to see that deep. Sorry but can't get that into it at the moment. Maybe somebody with a direct drive with better visibility can check that one for you.)

[jeffm1515]

Thanks for your help. If you reach over motor from swim deck and reach down ther you should at least be able to feel if there is a connector there or a wire. Nobody has been able to do that for me yet. The dealer up here has no clue.

[jeffm1515]

Its running. Thanks everyone