Air metering

:Original

::MAF

:VEMS

::4bar MAP + IAT (already have both)

::MAP will be mounted externally, close to the IM, shortest possible tubing

::5V supply comes from the ECU

::IAT is a BMW type, res./temp diagram TBC

:Wiring changes - MAF

::Cut off MAF at the pigtail, it's 3 wires (12V, GND, signal). Use these for the MAP sensor, which also takes 3 wires (5V, GND, signal).

:Wiring changes - IAT

::Need to look for a suitable wire that will be freed up, and goes to the throttle body area, where the IAT will be located.

::*1 or 2 wires? Ground wire could be spliced into the ECT/TPS ground B wire, which is right there. Only 1 additional wire needed then.

::*Idle switch? 2 wires from ECU, and idle switch is not used in VEMS, but TBC.

Crank angle, cylinder pos.

:Original

::mounted on EX cam, disc has two concentric rings for two optical pickups with OC outputs

::(pulled on up ECU side)

::

::Outer ring has 360 slits

::Inner ring has 4 windows w/ lengths in slits: 16, 12, 8, 4

::CHECKED no. of degree pulses for Window slits High/Low (H L H L H L H L) 16 74 12 78 8 82 4 86

::CHECKED 16 pulse window corresponds to Cyl 1. According to a few Internet sources, Rising edge of 16-slit window is 60 BTDC. Which sounds logical.

:: For primary trigger, will either use:

::::* Rising edge w/60 BTDC

::::* Falling edge w/28 BTDC (window length is 16 sectrig pulses, that's 32 crank degrees)

:: Secondary trigger will use Nissan special trigger option, sync Cyl#1 to Window longer than 13 sectrigger pulses ("Ignore pulses shorter than" option)

::

::

:VEMS

::using the same CAS with the "nissan 360 degree secondary trigger" option

:Wiring changes

::The TDC (inner ring) and the angle (outer ring) signals are both wired double into the ECU, on pins 41+51, and 42+52, respectively. Probably a good idea to solder these together, before crimping it into a connector.

::JDM swap guys and RHD M/T guys should check their wiring/colors on FSM page EF&EC - 82. It's a bit unclear, the TDC and angle signal has the same wire color (G/B). Label them before you cut.

Engine coolant temperature

:Original

::NTC regular type, 2.5kOhms at 20*C, 300Ohms at 80*C

:VEMS

::using the same

Throttle position sensor/switches

:Original

::Idle switch, closed when pedal released

::TPS ~1kOhms - ~9kOhms for fully released, fully pressed, respectively

:VEMS

::using the same, except idle switch is not normally considered (although it can be connected to a free analog input of course). Mixing in idle switch (pulling to GND, but through 10..20k) into TPS signal (for a voltage "step") is superfluous and should not be justified, TPS has all the information without this anyway.

Knock sensor

:Original

::1 channel, piezo type, mounted between #2 and #3, shielding grounded to ECU ground, near ECU

:VEMS

::using the same

O2 sensor

:Original

::N/A, stock narrowband removed, Bosch 4.x installed

::TBC 4.2 or 4.9

::TBC for any special requirements for an extension cable, twisting, shielding, etc., or just simple wiring

:VEMS

::using the Bosch 4.x WBO2 directly