slk w170 died

[jigglebug]

slk w170 died on me !!!!
got in car last night cranked over engine and probably put gear selector in drive too soon before it had started vehicle will now not even crank over every thing lights up as usually just wont turn over ????
plugged in diagnostic just and shows code p202c-8
any ideas what the problem could be i have a host of parts to throw at it but dont know where to start i changed k40 overheat relay but no different any help much appreciated

 

[Giantvanman]

P202C-008 CAN BUS signal from EIS controller,CAN BUS signal interrupt drive authority

Clear as mud?

 

[jigglebug]

exactly what does that mean ?? i need too find someone that had the same problem main dealer will have a field day if i take it there they will be none the wiser and charge me £1000 s for unnescessary parts

 

[BlackC55]

You need a Star. The code on its own will not help you.

 

[jigglebug]

i have 5 slk breaking and a mountain of spares i am not stuck for parts just knowledge and a non descriptive diagnostic code

 

[ernie]

Absolutely no expert in these, but it sounds like the <start> inhibitor in the gear selector has got a bit confused when you tried to select the gear before the engine had fired.

I would try to move the selector around a bit, with ignition on and footbrake pressed as normal and see if it might release itself. Another possibility might be a battery reset.

Only theoretical suggestions, I'm afraid, hopefully others might have better suggestions.

Ernie

 

[grober]

Have you tried using a different key? Sounds as if the ignition switch isn't recognising the key.

 

[Giantvanman]

slk w170 died on me !!!!
got in car last night cranked over engine and probably put gear selector in drive too soon before it had started vehicle will now not even crank over every thing lights up as usually just wont turn over ????
plugged in diagnostic just and shows code p202c-8
any ideas what the problem could be i have a host of parts to throw at it but dont know where to start i changed k40 overheat relay but no different any help much appreciated

exactly what does that mean ?? i need too find someone that had the same problem main dealer will have a field day if i take it there they will be none the wiser and charge me £1000 s for unnescessary parts

i have 5 slk breaking and a mountain of spares i am not stuck for parts just knowledge and a non descriptive diagnostic code

Post 4 is Mercedes-Benz Independent Specialist………you don't have to go to a dealer and no need to become irate either.
A possible causes Mercedes EIS EZS Immobiliser Key Module Recoding And Repair Service

Read post four and take it as gospel; find an independent specialist and ask how much they charge for STAR diagnosis. If an indy is available, get a quote for STAR by the hour from a dealer and set a limit.

EDIT: Grober beat me to it.

 

[jigglebug]

i only have one key for this vehicle but it is looking highly likely that the key is damaged or the key reader ????? not sure which one

 

[grober]

This post gives an explanation of how the key works for US models and suggests a work around. -- at your own risk!!!! that's assuming your problem is with the key/ignition switch in the first place !!! Getting another key - Page 7 - Mercedes-Benz Forum

e.g.

The USA SLK key fob consists of three separate components integrated into one package: a mechanical ignition key, a radio frequency (RF) transmitter, and a radio frequency identification (RFID) module.
The flat key consists of the combination of a mechanical key and an RFID imbedded in the plastic head.
The mechanical key is of course cut to match the mechanical lock on the ignition switch. It can be removed and replaced from the fob, so it is possible to alter this portion of the fob to match another vehicle.
The RF transmitter is powered by a battery and activated by the buttons on the remote to lock and unlock the doors and, if so equipped, arm and disarm the alarm. It works much like a garage door opener and uses a rolling code technology. This technology requires that the transmitter and receiver be in synchronization. The receiver must know the next code(s) to expect from the transmitter. Since the owner’s manual describes how to synchronize transmitters, it is reasonable to assume that the RF transmitter portion of a fob bought off eBay could be synchronized to your car (although I have never tried it). Note that when you synchronize it is actually the receiver (the car) that is programmed to or learns the transmitter, not vice versa.
The RFID is a small passive device, meaning it has no power supply of its own. Its main components are a coil, a capacitor, and a chip. These components are typically sealed in glass, cylindrical in shape, and quite small like a grain of rice . Surrounding the SLK ignition switch is a coil. When you turn your key to start your car, the Drive Authorization System (DAS) sends a high-frequency burst to the ignition switch coil. This induces a current in the nearby RFID coil which charges the capacitor. The capacitor in turn powers the chip for a short time. The chip sends back a coded pulse which is now received by the ignition switch coil and relayed back to the DAS. If the DAS likes it, it tells the ECU to start the engine.
The RFID can be programmed once and only once with a code to broadcast. It can be programmed using a special transmitter. It is programmed with a code, or number, that matches the DAS in your car in effect, your VIN. Since it cannot be reprogrammed, it is not possible to use one from a different car to start your car.
Your safest bet as advised is to to get it on a Star machine to identify the source of the problem otherwise if you are not carefull you can start throwing money at imaginary problems.

 

[jigglebug]

thanks for that grober what is a star machine ?????? and who has one

 

[BlackC55]

Dealers and specialists like me.

 

[grober]

thanks for that grober what is a star machine ?????? and who has one

The "Star " system is MERCEDES own dedicated computerised diagnostic system capable of talking to all their CARS' onboard computer systems and programming /resetting them. In its most up to date form its very expensive- we are talking four figures +which puts it out of the reach of all but the professionals. Even with the necessary hardware it needs an experienced technician to interpret the results it produces.