OM642 CPS adventure - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 33 (permalink) Old 01-03-2019, 04:54 PM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,379
Mentioned: 2 Post(s)
Quoted: 266 Post(s)
(Thread Starter)
OM642 CPS adventure

This is on an Ď08 with 120K.
Had a failure to start following a 2 hour ride. Stopped for a humanity break and engine would crank, but not start. Had driven through rain most of the way though not sure if it fits in.

Waited about 40 minutes and engine started, drove another 30 minutes with no trouble. No CEL and full power.

Fast forward 2 months. Drove the ML on a 60 mile route making stops along the way. Raining. Mrs drives the already warm vehicle a couple of miles, makes a short stop, and engine cranks-no start.
I pick her up and finish the purpose of the trip. We go back about an hour later and engine starts and we drive home.

No codes. Ordered a CPS as this reminded me of a gas CPS failure mode.

Part arrived and I changed it today. NOT an easy task on these engines. Requires removal of the drivers side air filter and working blind. There is a heat shield covering the sensor and then the sensor. The sensor has three contacts and I measured the old vs new to see if there was a difference.
New: outer connections had resistance, one outer to middle had resistance and the other outer to middle had none.
Old: outer connections had no resistance, one outer to middle had resistance (lower than the new one) and the other outer to middle had none.

Installation took too long and I have new respect for those folks who can work via mirrors. I worked from above and only briefly considered taking the under panels off as itís Winter here and the garage floor is wet and cold.

Engine started somewhat quicker than before.

Iíll report further as we get some miles on it.

YMMV

Skippy


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
Sponsored Links
Advertisement
 
post #2 of 33 (permalink) Old 04-03-2019, 04:06 AM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,379
Mentioned: 2 Post(s)
Quoted: 266 Post(s)
(Thread Starter)
I thought I had cured this problem, but....

Was with the Mrs and we had gone on a 40 mile trip, couple hour wait, another short jaunt for breakfast. Upon return it cranks, no start.

Fuel pump is not engaging when key is in position 2. While I wait for whatever needs to be cooled down I fiddle with relays under the hood and swap one for the fuel pump relay in the back. Turn key, pump starts, engine runs. Drive home.

I figured the relays MIGHT be tired and ordered a batch from Autohausaz. They have not arrived yet.
I swapped the fuel pump relay from my Ď07 Bluetec. All seemed fine until...

Yesterday I went on a short journey of 7 miles and stopped briefly. Truck was turned off and locked.
Upon return some 5 minutes later I get crank but no start.

I wait for an hour and pump starts and I drive home.

Iíve started checking general connections, both positive and grounds.

Any thoughts on next steps? Relays expected later this week.

Thanks, Skippy


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
post #3 of 33 (permalink) Old 04-04-2019, 02:28 AM
Lifetime Premium Member
 
Date registered: Aug 2006
Vehicle: 02 ML320 06 ML500
Location: Bronx, New York
Posts: 16,549
Mentioned: 23 Post(s)
Quoted: 1530 Post(s)
Lifetime Premium Member
Skippy, all that writing and you do not say who you ordered the sensor from and what was the part number?

Is the problem worse or the same as before?
43sqd is offline  
Sponsored Links
Advertisement
 
post #4 of 33 (permalink) Old 04-04-2019, 03:21 AM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,379
Mentioned: 2 Post(s)
Quoted: 266 Post(s)
(Thread Starter)
OM642 CPS adventure

CPS sensor was from Autohausaz 642153072805.

Problem today is still intermittent. Drove 50 miles yesterday with a 30 minute stop and no issues.

Relays ordered from Autohausaz, but not here yet.

3 - 0025421119 (4 prong fuel pump relay in rear compartment and 2 in front (engine compartment).
2 - 0025421419 (5 prong in front compartment).
2 - 0025422619 (4 prong in front compartment).
1 - 0025427619 ( 5 prong in front compartment).

First 7 are Hella and the last is Genuine Mercedes.

My thoughts are that the front compartment gets much warmer especially after engine shutdown.

This grouping will replace all of the relays in the front compartment plus the fuel pump relay.

Likely overkill, but I am trying to eliminate potential problems.

I scanned the car again yesterday - no codes. Carsoft MBII.


Sent from my iPad using Tapatalk

Skippy,

Last edited by SkippyJasper; 04-04-2019 at 03:27 AM.
SkippyJasper is offline  
post #5 of 33 (permalink) Old 04-04-2019, 06:16 AM
Lifetime Premium Member
 
Date registered: Aug 2006
Vehicle: 02 ML320 06 ML500
Location: Bronx, New York
Posts: 16,549
Mentioned: 23 Post(s)
Quoted: 1530 Post(s)
Lifetime Premium Member
Skippy, what is you full vin#?
43sqd is offline  
post #6 of 33 (permalink) Old 04-04-2019, 06:52 AM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,379
Mentioned: 2 Post(s)
Quoted: 266 Post(s)
(Thread Starter)
4JGBB22E68A348961

Finally got my a## in gear and bench tested the relays. All seem fine. Tested resistance across the coil and then confirmed good contact across the load points. This was with the relays cold (ambient is 30F).

I looked for the old CPS, but think I tossed it.

Appreciate your efforts.


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
post #7 of 33 (permalink) Old 04-04-2019, 08:22 AM
Lifetime Premium Member
 
Date registered: Aug 2006
Vehicle: 02 ML320 06 ML500
Location: Bronx, New York
Posts: 16,549
Mentioned: 23 Post(s)
Quoted: 1530 Post(s)
Lifetime Premium Member
According to your vin#, you purchased or were given the wrong sensor.
Attached Thumbnails
Click image for larger version

Name:	2019-04-04_111941.jpg
Views:	20
Size:	37.4 KB
ID:	2501636  
43sqd is offline  
post #8 of 33 (permalink) Old 04-04-2019, 07:18 PM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,379
Mentioned: 2 Post(s)
Quoted: 266 Post(s)
(Thread Starter)
OM642 CPS adventure

Buggers! I appreciate the information.
The EPC info would capture any updates to part numbers?

Oddly, the Autohausaz ordering page shows the following:
ĎCross References: 642153072805 6429050000 6429050000Yí
It states this applicable to a variety of engines:
Dodge Sprinter 2500, Sprinter 3500
Freightliner Sprinter 2500, Sprinter 3500
Mercedes E350, C300, ML350, S550, GL450, C280, GLK350, C230 Sport, Sprinter 2500, CLS550 & more

Iíll pursue getting the correct sensor through a local dealer though itís 1 hour to the south or 1.5 hours to the north of here.

The job itself isnít exactly a walk in the park either.

Skippy


Sent from my iPad using Tapatalk

Skippy,

Last edited by SkippyJasper; 04-04-2019 at 07:27 PM.
SkippyJasper is offline  
post #9 of 33 (permalink) Old 04-05-2019, 01:03 AM
Lifetime Premium Member
 
Date registered: Aug 2006
Vehicle: 02 ML320 06 ML500
Location: Bronx, New York
Posts: 16,549
Mentioned: 23 Post(s)
Quoted: 1530 Post(s)
Lifetime Premium Member
Order it here.

https://www.mbpartsworld.com/auto-parts


Also, here is a copy of your DATA Card with all the option codes.
Attached Files
File Type: pdf Java Printing.pdf (49.8 KB, 6 views)

Last edited by 43sqd; 04-05-2019 at 01:11 AM.
43sqd is offline  
post #10 of 33 (permalink) Old 04-05-2019, 03:57 AM Thread Starter
BenzWorld Elite
 
Date registered: Feb 2010
Vehicle: 2007 E320 Bluetec, 2008 320ML CDI
Location: Western Michigan
Posts: 2,379
Mentioned: 2 Post(s)
Quoted: 266 Post(s)
(Thread Starter)
Thanks.

Item ordered.

Last time I replaced it was from above after removing the left air filter. Needed a mirror to see it. I recall that I didnít work from under the car as it was early January and things were mighty cold.

Perhaps Iíll try it from under this time.


Sent from my iPad using Tapatalk

Skippy,
SkippyJasper is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Vans/Trucks/SUV/Others > W164 M-Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome