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MembersPage/MercedesAmgM113 (2023-05-04 21:41:35)

Mercedes AMG M113, without compressor from factory (not M113K) but compressor DIY-added

V8 engine 15426378 firing order (CL500 or similar chassis)

[M113 engine] 3 valves and dual sparkplugs per cyl (16 sparkplugs total), no VVTI

Need some investigation (or hint, eg pinout) regarding M113 sectrig HALL sensor

engine harness schematic might also cast some light on this?
- although both GND and output seems to be connected to ECU (camHALL GND not connected to other GND-s in the harness, only inside the ECU)

Primary trigger VR (1072 Ohm)

Factory trigger seems to be "inverted",
- need to swap wires so that falling edges are correct at missing tooth
- This must be verified

Secondary trigger: 1 pulse per camrot Bosch 0.232.103.027 is this HALL sensor for sure? Output is LOW/HIGH or pulls to GND or something weird?

pinout (uncertain)

GND from Bosch ECU/pin39 (low current connector) brown-green
is middle pin the output? pink = Bosch ECU/pin 40 (low current connector)
pinX is +12V (in factory harness same net as injector shared +12V) red-blue

Big mistery with secondary trigger,

Does not react to hammer moved near and away
Apparently same sensor as in [this m112 video] (and even same pins 39,40 in the factory engine harness, although the factory harness is not actually used), but our sensor does NOT react.
- IN THE VIDEO, middle pin seems to be GND (although he attached red probe there, it shows negative)... 12V when no iron, and 0V when ferromagnetic tool is close

Possible causes

maybe custom harness is miswired (certainly if the sensor middle pin is GND)
- perhaps HALL sensors ruined? Or just not operate properly while connected wrong...
maybe some weird signal (frequency output like BMW/M52 ?)

DBW

currently factory ECU drives it, but VEMS is prepared (with bridgeoutput driver)

Ignition

URLS