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AGuess
Elite Veteran
Date registered: Apr 2006
Location: Holly Springs NC
Vehicle(s): 93 500GE, 93 500GE, 2002 G500
Posts: 717
| CPS Crankshaft Position Sensor - Trick
2002 G500 has a problem with the CPS Crankshaft Position Sensor . When the engine is hot and I shut off, it will not restart, just cranks and cranks. Happened in the drug store drive through lane last night.
I called my friend who works for MB and he told me to raise the hood and take a bottle of cold water, then pour the water on top of the back of the engine at the bell housing from the center of the engine along to the fender, at the fire wall. He said the cold water cools off the CPS Crankshaft Position Sensor and the car would start. It is what they do on road side service.
I went inside, bought a $1 bottle of cold water and it worked. I have now purchased a new CPS Crankshaft Position Sensor.
Just thought I would pass along the trick. He said if no water, open hood and wait about 15 minutes, as the engine cools down, the contacts work again so you can start. Very common problem.
AGuess |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: CPS Crankshaft Position Sensor - Trick
Great Tip!! Thank you!!! |
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Jonathan Joseph
Expert
Date registered: Oct 2006
Location: Charleston, South Carolina
Vehicle(s): 2004 G55
Posts: 1538
| RE: CPS Crankshaft Position Sensor - Trick
Is the CPS not on the front of the engine near the crankshaft pulley?
Jonathan |
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| RE: CPS Crankshaft Position Sensor - Trick
here we go - L5
 (CPS.jpg)
Attachments
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 CPS.jpg (281KB - 29 downloads)
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AGuess
Elite Veteran
Date registered: Apr 2006
Location: Holly Springs NC
Vehicle(s): 93 500GE, 93 500GE, 2002 G500
Posts: 717
| Re: CPS Crankshaft Position Sensor - Trick
According to my friend who is a MB mechanic by day.
Old crank sensor, pre 1998 were on the front of the engine. In 1998 moved to bell housing for a more accurate reading. The flywheel now has windows cut into it, and eng control unit can tell what position eng is in.
I am going to replace it tomorrow. |
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| Re: CPS Crankshaft Position Sensor - Trick
there was no M113 engine before 1998
http://en.wikipedia.org/wiki/Mercedes-Benz_M113_engine |
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Fernando BR
Date registered: Jan 2007
Location: Brasil
Vehicle(s): G500/05 300GE/91 300GD/80
| Re: CPS Crankshaft Position Sensor - Trick
My M103 (1991) L5 is over the flywheel ( it reads flywheel teeth speed) , L1 is near the cranck puley. |
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roughneck
Expert
Date registered: Apr 2006
Location: UK, Germany & USA
Vehicle(s): 270 cdi.300 GD 300 GE.lwb 300 GE.swb. Disco 2
Posts: 4398
| Re: CPS Crankshaft Position Sensor - Trick
What a neat trick and a sad state of affairs at the same time, How much is a G 500, and you have to buy a $ bottle of weater to get it going, Thats one G I'll never own.  |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: CPS Crankshaft Position Sensor - Trick
My ongoing theory of why these things fail is simply that they weren't properly designed for the heat of that location. The 290 diesels have the same sensor and I never hear of them going bad. That, in my opinion, is because the exhaust is way over on the other side of the engine. So, while you are busy installing the CPS, see if you can figure a way to thermally insulate it. A little aluminum foil hat might be enough. (Yes, I know how buried that part is).
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: CPS Crankshaft Position Sensor - Trick
AlanMcR - 8/6/2012 4:30 PM
My ongoing theory of why these things fail is simply that they weren't properly designed for the heat of that location. The 290 diesels have the same sensor and I never hear of them going bad. That, in my opinion, is because the exhaust is way over on the other side of the engine. So, while you are busy installing the CPS, see if you can figure a way to thermally insulate it. A little aluminum foil hat might be enough. (Yes, I know how buried that part is).
Just looking at the EPC, I see the original part has been updated; and when you do a back track on the new part number, it shows for the G55 AMG. I wonder if it has better heat tolerance for the turbocharged engine. |
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AGuess
Elite Veteran
Date registered: Apr 2006
Location: Holly Springs NC
Vehicle(s): 93 500GE, 93 500GE, 2002 G500
Posts: 717
| Re: CPS Crankshaft Position Sensor - Trick
The new sensor is in. It took about 5 minutes with the engine cool. The only real problem in doing this is that the sensor is so far down on top of the bell housing that it is hard to reach, I am 6' and it was a stretch with my arm to reach it. Maybe I have short arms. |
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robwill54
Veteran
Date registered: Aug 2007
Location: South of Houston on the Gulf
Vehicle(s): '12 G550,F350 Superduty, E250
Posts: 140
| RE: CPS Crankshaft Position Sensor - Trick
Just changed mine at 50,000 miles. Fairly easy and probably good for another 50k. Water bottle sounds like a good trick to get you out of a jam and back to the house! Nice thing about the G, it is fairly predictable and not too much new under the sun.
Bob |
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MiN
Extreme Veteran
Date registered: May 2006
Location: Alpujarras, Spain
Vehicle(s): No cars, at all.
Posts: 555
| Re: CPS Crankshaft Position Sensor - Trick
I hoping I'm not tempting fate here (and I do carry a spare) but I changed my CPS about 160,000 miles ago and have had no recurrence of the the symptoms since. It gets hot here too, over 45 degrees for about 2 months in the summer and up to 48 degrees regularly.
The tip with the water is great; water is always carried in the car. |
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roughneck
Expert
Date registered: Apr 2006
Location: UK, Germany & USA
Vehicle(s): 270 cdi.300 GD 300 GE.lwb 300 GE.swb. Disco 2
Posts: 4398
| Re: CPS Crankshaft Position Sensor - Trick
MiN - 8/7/2012 6:20 AM
I hoping I'm not tempting fate here (and I do carry a spare) but I changed my CPS about 160,000 miles ago and have had no recurrence of the the symptoms since. It gets hot here too, over 45 degrees for about 2 months in the summer and up to 48 degrees regularly.
The tip with the water is great; water is always carried in the car.
You might want to carry one of these too, speeds up the process.
http://uk.rs-online.com/web/c/?searchTerm=+freezer++aerosol&sra=oss |
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