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#1
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M104 Engine Front Crankshaft Sensor Purpose
Would anyone happen to know if the front crankshaft sensor on a M104.990 engine does anything? I inspected my front sensor and found the wire on the left side fender harness was cracked w/ the grounding touching the metal. However, I don't see it plugged into anything?? The sensor wire is in the bottom of a connector, that has a cap on the top & no plug that plugs into it??
I replaced the sensor w/ a spare I had (first time) for this sensor. I understand that the parts diagram shows a front & rear crankshaft sensor for my car (1993 Benz 300SE). Any insight is appreciated. Thank you. |
#2
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Front sensor is camshaft position sensor in all liklihood. I've had an M103 with this wire cut off and no ill effects.
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Kent Christensen Albuquerque '07 GL320CDI, '10 CL550. '01 Porsche Boxster Two BMW motorcycles |
#3
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The capped plug you are referring to is a diagnostic plug. (On earlier diesels, it has a tach amp plugged into it). Grounding this wire probably doesn't do any harm unless a scope is plugged in at the time, in which case the scope might become fried.
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Don't Chrome them; polish them |
#4
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He's talking about the TDC sender by the harmonic balancer.
It ususally goes to X11 diagnostic socket.
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1993 400E Mercedes Benz technician since 1982 ASE Master technician to 12/2015 |
#5
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Yes Clark - found out that this is just a tester sensor & does not affect engine performance. The rear crankshaft sensor I discovered is the one that the ECU reads from, as well as the camshaft sensor on the left front top of the engine block. Replaced both & am having the computer relearn the stops & other things that it does during relearn (about 10 trips).
Thanks guys for your assistance. |
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