[ProdigyChild]

I got a 2000 S500 towed to me last week, dead battery after sitting for a year in a garage. After charging the battery (will need a new one) had plenty of cranking power. Fuel pressure is good, even added 10gal of fresh to the tank. Its getting fuel, and the only code in the system is P0460 for a bad fuel level sender. Tested spark, and nothing, crank rpm good @205rpm, also noted the key fob doesn't unlock the doors or trunk. The red light on the fob does light up, and it does turn the ignition, but that doesn't mean all is good. I havn't a lot of exp. wit MB, was working for GM dealers for the last 18 years. Is there a anti-theft system that could be afecting it, and not disabeling without the fob working?

Please, help,,

Thanks

 

[Busted_Knuckle]

ProdigyChild, what scan tool were you using? When you say you had 205 Crank RPM was that a signal on the scan tool or on the instrument cluster. The reason I ask is because alot of times (90%) a crank no start condition on a 113 engine is caused by a bad Crankshaft position sensor. The sensor should read under 1.3k ohm's of resistance. The quickes way of testing it is by taking it out. Or the more complete way of testing it is from the ME control unit connector. This will also test the wiring. This would be on pins 37 & 38 of connector "E" of the me control unit. Let me know if that helps. I can also send you the pics of the diagram & connector tommorow if you dont have access to them. Also in the EIS control unit under actual values in your scan tool, it should tell you if the EIS control unit is recognizing the key. Good luck.

 

[s55am]

i doubt it's the fob, as even if you open it manually as long as the ecu reads the key chip should unlock all the features. What you are talking about is the same as when my battery was dead. It would crack but no spark. Try a new batt or at least have someone hooked up ask them to rev their motor while you trying to start it.

if it has sat there and you know it used to work before, i doubt there is something else wrong with it

 

[ProdigyChild]

Thanks for the reply guys, I am using a snapon scanner, and the value given is rpm, I did notice that it cranked far a second or 2 before it showed the crank rpm on the scanner, but I figured it was just the scanner being a bit slow to respond. If it were the crank sensor, would I still have injector pulse? I am getting fuel into the engine, and I do have noid at the injectors, with that and rmp showing on the scanner while cranking, thats what made me think its something else. I will check the resistance value of the crank sensor to be sure. As for the battery, well, I am an indapendant repair shop, and the car is hooked up to a charger for a couple hours b4 cranking, and charger set to 50amps while cranking, motor spins over very fast. It wouldn't suprise me if the lack of spark and the fuel getting into the cylinders is washing it out a bit, will have to do an oil change when all said is fixed.

I will check the actual value of the crank sensor and get back to ya asap.

Thanks guys.

 

[xexpo]

When my crank position sensor went bad, the car would start cold then die after warming up.
Did you take the tow hook out from the front bumper? The hook disables at least the key perhaps more stuff.

 

[ProdigyChild]

Noting done witht he tow hook, I just ohm'd the sensor, and it came back open, interesting, how it would show crank rpm, but test open, anyways, I have one coming, should be here in about 2 hours, and I will let you know if it fixes it. Strange, everyother car thats had a crank no start caused by a ckp sensor, never showed crank rpm on a scanner. But this is a MB. lol

I will get back to ya for sure,
Thanks

 

[Busted_Knuckle]

When my crank position sensor went bad, the car would start cold then die after warming up.
Did you take the tow hook out from the front bumper? The hook disables at least the key perhaps more stuff.

I've been wrenching on Benz's for about a decade now (8 years at the stealership & 2 indy) & I've never heard of or seen a tow hook disable anything in the vehicle. There are no sensors that detect a tow hook being in place or not. I'm not sure who told you this, or what experience you had but that would be incorrect. I would like to be proved wrong however. I enjoy learning new things.

 

[ProdigyChild]

allrighty, I pulled the old ckp out, and retested, it ohm'd at 1.0, and the new one ohm'd at 1.2, not sure if didn't have the leads on the the terms, but either way, the new ckp sensor didn't fix the problem. Still a crank no start without spark.
The EIS (Elec. Ignition Switch) info shown on the scanner is that ECU N73 is open, where all other peramaters for the EIS are closed.

Closed I presume is a good ckt, and open not, not sure what the N73 is, any ideas?

Any other ideas?

 

[Busted_Knuckle]

allrighty, I pulled the old ckp out, and retested, it ohm'd at 1.0, and the new one ohm'd at 1.2, not sure if didn't have the leads on the the terms, but either way, the new ckp sensor didn't fix the problem. Still a crank no start without spark.
The EIS (Elec. Ignition Switch) info shown on the scanner is that ECU N73 is open, where all other peramaters for the EIS are closed.

Closed I presume is a good ckt, and open not, not sure what the N73 is, any ideas?

Any other ideas?

ProdigyChild, N73 is the EIS (Electronic Ignition Switch). Without being able to access all the live data in the EIS it will be slightly dificult to diagnose. The only other thing I can think of (other than Having you bring it to me ) is the 15 amp fuse that powers the coils. Fuse designation F1/1-49 (fuse 49 in the right front fuse box). Pull one of the coils & see if you have power at pin #2 of any coils. You said you were able to pull codes so this may be unlikely but also check power at pin #4 of connector "B" of the ME control unit. This is the 30 circuit for it (contious power). & pin #2 Connector "A" of the ME control unit, circuit 87ME1 (switch from relay).

 

[ProdigyChild]

Fuse good, #2 @ coil powered, pin #4 has power, I hate to ask this, but is there anyway this could be a security/anti-theft problem. It apears the ME isn't giving the signal to the coils. Does the anti-thift diable the ignition system only? Would it pay to have someone come out and program the key, since I only have 1 key and its not in the greatest shape?

 

[ProdigyChild]

OK, now I feel a little ignorant, I called a friend, and he told me to try the key in the door, and after calling the customer, and getting the door key here, I locked and unlocked the car from the drivers door, and BAM!!!! IT RUNS,,,lol

So the anti-theft, without horns and lights, will disable just the ignition system.

I do aprec. all the help, I know GM's arn't nearly as complicated as MB, but I am a GM world class tech (Mr. Goodwrench), so if there is anything I could ever help out with please feel free to hit me up.

Thanks again for your time and input Busted_Knuckle

 

[ProdigyChild]

Now that I have it running, there are a bunch of other probles, suspension, brake, ect. can't communicate with suspension control mod, so the car is all but sitting on the ground.

OK, I have had enough of this car for today, if I can't convince the customer to have it towed to a MB dealer, I will hit ya up again monday.