Initial start and CEL after installing new CPS -- CLK 500
Thread Starter
Junior Member
Joined: Jul 2009
Posts: 22
Likes: 0
CLK500, 370Z
Initial start and CEL after installing new CPS -- CLK 500
Quick question for you guys:
2003 CLK 500 was having trouble starting. When it did start (rare), CEL was on and the car would die while driving after a few minutes. Sometimes it'd restart, sometimes it wouldn't.
Stupidly, I didn't read the code, just assumed it was the CPS. Replaced the sensor and the car started up fine this morning the first two times, however on the third attempt it took a while to start and threw the CEL. Turned the car off, restarted, no CEL. It's been starting fine ever since.
Question is: is this normal after installing a new sensor? Is there an ECU learn period during the first few starts? Since it's starting fine now with no CEL, that's what I'm thinking (read: hoping).
Any advice is greatly appreciated... thanks!
2003 CLK 500 was having trouble starting. When it did start (rare), CEL was on and the car would die while driving after a few minutes. Sometimes it'd restart, sometimes it wouldn't.
Stupidly, I didn't read the code, just assumed it was the CPS. Replaced the sensor and the car started up fine this morning the first two times, however on the third attempt it took a while to start and threw the CEL. Turned the car off, restarted, no CEL. It's been starting fine ever since.
Question is: is this normal after installing a new sensor? Is there an ECU learn period during the first few starts? Since it's starting fine now with no CEL, that's what I'm thinking (read: hoping).
Any advice is greatly appreciated... thanks!
Last edited by m4a1mustang; Jun 19, 2010 at 09:01 AM.
Junior Member
Joined: Mar 2010
Posts: 33
Likes: 1
From: Middle of the Pacific
2017 E300
well, usually after a crank position sensor has been replaced, it is necessary to reset smooth running adaptations for ECU. this will ensure the new crank sensor's reading pattern is learned and ECU can control the ignition timing more precisely.
Thread Starter
Junior Member
Joined: Jul 2009
Posts: 22
Likes: 0
CLK500, 370Z
Understood. And the ECU should start a re-learn phase after the battery has been disconnected for a short period of time, correct? Car seems to be starting/running perfectly now so I'm feeling better about it.
Junior Member
Joined: Mar 2010
Posts: 33
Likes: 1
From: Middle of the Pacific
2017 E300
you can disconnect the battery, and the ECU will relearn everything, or if you have an access to the SDS or know someone who does, use it reset the adaptations under the smooth running section of the ME system. Also, plugging in the SDS will read the stored fault code(s) that triggered the CEL.
Thread Starter
Junior Member
Joined: Jul 2009
Posts: 22
Likes: 0
CLK500, 370Z
Well, local mechanic said it was the CPS but it needs to be calibrated and only a dealership could do it. Dealership saying nothing needs to be calibrated following a new CPS install and it must be something else. Getting towed to the dealership tonight... *sigh*.
Junior Member
Joined: Mar 2010
Posts: 33
Likes: 1
From: Middle of the Pacific
2017 E300
did he read the ECU fault codes? they must be stored if the CEL was on. If he has the SDS, he can easily reset the adaptations/calibrations and see if that fixes it, if the CPS is the culprit as he stated.
Trending Topics
Thread Starter
Junior Member
Joined: Jul 2009
Posts: 22
Likes: 0
CLK500, 370Z
Hopefully whatever it is turns out to be something simple. Would like to keep the car around for a while longer
Last edited by m4a1mustang; Jun 22, 2010 at 08:56 AM.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
