Mercedes AMG M113, 5L V8 without compressor from factory (not M113K) but compressor DIY-added with lot of mech-work.
Same set of sensors as the V6 M112 engine (just in case it is easier to find docs for that).
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",
- swapped wires so that falling edges are correct at missing tooth
- verified (slowly rising in tooth-gap)
- [scopeshot here] is good (wire swapping not needed if the same signal), may or may not be applicable...
- Factory ECU pin37, (pin38) are the crankshaft VR input
Primary trigger VR signal is really trash
- some teeth amplitude are 1.6 times greater.
- interestingly, not even the tooth right after missing tooth, but 4th tooth was bigger... Greater in positive direction, even greater going negative.
- most likely interference from ignition (?)
- need to try with ignition disabled, but battery was almost drained, had to stop.
- Most likely Shielded cable is needed. Shield connected at ECU side only, and GND and VR-signal wires inside connected on both sides.
- VR modification: either primtrig LM1815 pin5=5V to disable adaptive threshold, or R181=270k or similar
- signal amplitude is otherwise OK, but high voltage noise is unknown.
- Perhaps a 1k pulldown could be useful at the same time if signal amplitude allows...
Secondary trigger: 1 pulse per camrot Bosch 0.232.103.027 - sensor had contact problem at male receptacles (oxide? even with new heatshrinked receptacle it did not work first
- Verified HALL sensor for sure (with +12V supply, 30..40mA supply current)
- Pulls to GND (with pullup resistor in ECU)
pinout (Verified: pin1,2,3 are: GND, HALL output pink, +12V red-blue)
- pin1: GND from Bosch ECU/pin39 (low current connector) brown-green
- pin2: output pink = Bosch ECU/pin 40 (low current connector)
- pin3: +12V (in factory harness same net as injector shared +12V) red-blue
Similar bosch camshaft Hall sensor's datasheet: [0232.103.037] - All "0 232 103 XXX" sensors seem to bee camshaft sensors.
Big mistery with secondary trigger,
- Ours did not react to hammer moved near and away (when powered +12V, of course)
- 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 signal output as assumed (he attached probes reversed in DVM, never mind)... 12V when no iron, and 0V when ferromagnetic tool is close
DBW
- currently factory ECU drives it, but VEMS is prepared (with bridgeoutput driver)
Ignition
- 16 sparkplugs (dual sparkplugs per cyl)
- only 8 passive ignition transformers
URLS
- MembersPage/PeepPaadam/MercedesAMGSL - very similar
- MembersPage/MercedesSelFivePointSix
- MembersPage/AmgSlovakia much more sophisticated