Hey guys on a 1989 mercedes 300E, 3.0L inline 6 where is the crank sensor front or back, also how do you test it to see if it is working right and if somebody has the right specs that would be awesome.Thanks

The crank sensor is in the rear on the bellhousing. It's right above the starter and has a 5mm allen bolt holding it in.

__________________
Allen Kroliczek
Oak Grove Autosport | Oak Grove Autosport
01 G500, 82 300TD, quite a few more.....

Here's the main diagnostic test for that L5 sensor (see FSM section 15-1250 for complete description). Engine cold. Ignition off. Unplug the L5 sensor at the EZL. Multimeter set to Ohms. Positive probe on inside of pin. Negative probe on outer part of pin. Spec is 680 -1200 Ohms. If no, rplc L5 sensor.

__________________
1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

Is the EZL the electronic computer located behind the battery.. Pictures would be great thanks

Driver's side on top of fender well, the CPS connects to the upper left position.
My CPS measures 851 ohms cold, and 924 ohms hot.

Looks something like this:

__________________

1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

Use an ohmmeter to test the resistance; sb about 1000 ohms (if I remember correctly) plus or minus 150 ohms.

It's a magnetic sensor w/ no electronic parts. They're pretty reliable and usually don't fail unless the unit is mechanically damaged.

One last point; If it was "bad", the car wouldn't run!

__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page

True, but if they were beginning to fail, one would have hard hot starts or starting in general. Usually the crank sensor is the last to be checked though.

__________________
Allen Kroliczek
Oak Grove Autosport | Oak Grove Autosport
01 G500, 82 300TD, quite a few more.....

My car had a crank sensor that still measured within spec....but was causing problems. If its original it is probably a good idea to replace it.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)