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No engine does not run. No crank, no start, only dash lights?

Tiny
HAL1958
  • MEMBER
  • 2009 MERCEDES BENZ CLK 350
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 118,000 MILES
When starting engine cold after a few minutes when coolant temp gauge is about one third the red coolant temperature light comes on and engine shuts down and fuse 54 blows. Then it has no crank and no start. Replace fuse 54 and blows again when turning key to on position. I replaced coolant temperature sensor and thermostat housing and still the same. Disconnected the battery for an hour then connect and it will start and shut down again with temperature light on. No codes on scanner.
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Sunday, September 17th, 2023 AT 10:07 AM

60 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,960 POSTS
Yep, this happens when the radiator cooling fan has gone out. Here are the wiring diagrams for the fan and fuse #54 so you can see how the system works and I have included how to change the fan assembly out. Check out the images (below). Please let us know if you need anything else to get the problem fixed.
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Monday, September 18th, 2023 AT 12:48 PM
Tiny
HAL1958
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  • 82 POSTS
Is there a test I can do maybe with a multimeter on the fan to make sure the control module is bad before I buy a new one?
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Tuesday, September 19th, 2023 AT 5:38 AM
Tiny
KEN L
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The fan has a simple power and ground connection which powers and grounds the motor, they vary the small ground wire to the module to control the fan speed. I would check the main ground and power and if okay replace the fan module/motor.

This guide can help and use the wiring diagrams above:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please let us know how it goes.
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Wednesday, September 20th, 2023 AT 5:35 PM
Tiny
HAL1958
  • MEMBER
  • 82 POSTS
I checked the ground and power wire and it’s good to fan. I ordered the fan. In the meantime, I disconnected both battery leads and ran a wire from positive lead to ground for a few hours. I read that I may reset the ECM and all control modules. When I reconnected the battery I got no crank anything. I connected my launch 3001 reader, and it said ECM. It’s a basic reader. Did I erase the ECM program when I grounded the positive lead? Maybe it doesn’t know the key anymore? What happened here? What can I do?
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Thursday, September 21st, 2023 AT 8:13 AM
Tiny
HAL1958
  • MEMBER
  • 82 POSTS
Also, I forgot to mention that when I turn the key the dash lights come on but then no crank no sound at all. I hope the ECM is still good.
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Thursday, September 21st, 2023 AT 11:12 AM
Tiny
HAL1958
  • MEMBER
  • 82 POSTS
Also, I jumper wire 3 and 5 on starter relay with key on position and engine cranks but no start. With relay back in key turned engine has no crank no sound. My reader now shows po607 code, control module performance.
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Saturday, September 23rd, 2023 AT 7:25 AM
Tiny
HAL1958
  • MEMBER
  • 82 POSTS
I replaced the fan assembly and also the crankshaft position sensor. I still have no crank and no sound at all using key. I decided to jumper the fuel pump relay and starter relay with key in on position and it cranks but no start. I thought doing this would bypass the ECM and it should be starting. I’m not sure? After that I connected my 3001 reader, and it showed control module performance po 607 again but this time also camshaft sensors 1 and 2. I’m not sure if the sensors are bad or if the ECM is bad and not reading the sensors information? Can you read my previous replies to see what I did? What troubleshooting can I do next to get my car running again?
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Sunday, September 24th, 2023 AT 8:57 AM
Tiny
KEN L
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It sounds like you popped a fuse, I would use this guide and check all fuses I have also included the fuse locations.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

test the fuses with the system on. Check out the images (below). Please let us know what you find.
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Monday, September 25th, 2023 AT 7:31 AM
Tiny
HAL1958
  • MEMBER
  • 82 POSTS
Checked all fuses one at a time and all good. Did a volt and ohms check on relays in engine compartment and checked good for starter, air pump, seq asg pump, term 15r, term15. Also checked in trunk the relays for fuel pump, term 15, term 15r. Also, good. I don’t know where the pre fuses are. I think where the battery jump connection is with the red cover. Are there some pre fuses there to check?
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Monday, September 25th, 2023 AT 12:26 PM
Tiny
KEN L
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With the key on do you have power at fuse #5 in the under-hood fuse panel and fuse #54 on the front sam control fuse panel? Here is the main power distribution. You may have popped the front SAM controller. Check out the images (below). Please let us know what happens.
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Tuesday, September 26th, 2023 AT 11:22 AM
Tiny
HAL1958
  • MEMBER
  • 82 POSTS
Fuse 5 is in the trunk and my car does not come with that fuse, it’s empty. I check the power to fuse 54 under hood with key in second position and no volts. Is there a pre fuse that protects the front SAM that I can check? Also, how can I remove the SAM to check the circuit board? It looks like the wiper motor arm is in the way. Also how do I check the ECM? I heard they have problems with capacitors that go bad, and car will be dead. These parts are expensive, so I want to make sure it’s bad before I replace them. I want to do all the necessary troubleshooting first.
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Wednesday, September 27th, 2023 AT 9:49 AM
Tiny
KEN L
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Hmm, it looks like the info is incorrect, fuse #5 is for the fan control module and fuse 6 should be 60 amp but by the image you provided the fuse is 20 amp? Is this a Euro car?
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Thursday, September 28th, 2023 AT 10:10 AM
Tiny
HAL1958
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No, it’s not a Euro car. It’s called the Grand Edition model because it was the last year for clk350. I’m not sure if it’s a little different than the base model. I removed the front SAM and checked the circuit board, and it looks like new. Wiring and fuses all look good also. Part # is 2095452801. Part # of the ECM is A2721531092. Are there some prefuses that go to the front SAM? How can I check to see if it’s the ECM or the front SAM causing my no crank no start no sound?
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Thursday, September 28th, 2023 AT 4:19 PM
Tiny
HAL1958
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  • 82 POSTS
This is the fuse chart that came with the car.
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Thursday, September 28th, 2023 AT 4:49 PM
Tiny
KEN L
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Okay, it this point we should run the codes for the CAN which will tell us if the SAM or PCM is not working. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Please go over these guides and get back to us.
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Friday, September 29th, 2023 AT 10:25 AM
Tiny
HAL1958
  • MEMBER
  • 82 POSTS
These are the codes I got using Launch 919x reader. Let me know if there are more checks I can do with this scanner to find problems. I would like to try the least expensive repair first that may fix my problem. I’m enclosing pictures of the screen codes.
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Sunday, October 8th, 2023 AT 6:34 AM
Tiny
KEN L
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You got some codes there :) The majority of them seem to point towards the bad engine control module. But I did see a code for the circuit 87 which feeds the controller. Does the engine run? If so, I would clear the codes and then turn the key on without starting the engine to see if any come up. Also, can you remove the front SAM control wiring connectors to see if there is any corrosion? Also, you might be able to open the unit up to see if it smells burnt.
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Monday, October 9th, 2023 AT 8:45 AM
Tiny
HAL1958
  • MEMBER
  • 82 POSTS
No engine does not run. No crank, no start, only dash lights. With the key in start position no fuel pump sound or no starter clicking. The radiator fan still comes on high speed with key on and shuts off with key in off position. Replacing fan, I think was a waste of money. I checked the front SAM connector pins each one and circuit board and no corrosion. I opened ECM and board has no corrosion. I cleared all codes and then rescanned. I enclosed the pictures of codes. The ECM doesn’t show up in scan this time. When I tried to enter ECM in control units it showed communication error. Are there some checks I can do to see if ECM is sending signals to start car?
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Tuesday, October 10th, 2023 AT 12:40 PM
Tiny
KEN L
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I don't see the images? Also testing the ECM can be difficult I would remove it and send it in for evaluation. Here are the starter wiring diagrams so you can see how the system works.
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Wednesday, October 11th, 2023 AT 7:37 AM
Tiny
HAL1958
  • MEMBER
  • 82 POSTS
Last scan pictures after clearing all codes and key in 2nd position. Is there anything I can do with my scanner to get the ECM to reset so the scanner can communicate with it?
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Wednesday, October 11th, 2023 AT 12:47 PM

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