C20xe loom conversion to be used for c20let

[oliverweb]

Does anyone have schematics to compare how much I need to rewire the XE loom to be used with LET engine?

Or a pin layout on both ECUs to compare what needs to be changed

[oliverweb]

[oliverweb]

C20LET ECU connector side




Terminal Assignment
Ter. 1 Final stage, ignition module K 20/Ter. 4
Ter. 2 Recognition 1 at gear S 53
Ter. 3 Ground actuation for fuel pump relay K 68 / Ter. 85 B
Ter. 4 Ground actuation for idle speed adjuster M 33
Ter. 5 Ground actuation for tank vent valve Y 34
Ter. 6 Unoccupied
Ter. 7 Signal, hot wire mass air flow meter P 44/Ter. 3
Ter. 8 Signal, Hall sensor cylinder recognition P 47/Ter. 2
Ter. 9 Signal, odometer frequency sensor P 21
Ter. 10 Ground Ter. 31
Ter. 11 Signal, knock sensor
Ter. 12 Voltage supply, Hall sensor P 47/Ter. 3; throttle valve potentiometer P 34/Ter. 1
Ter. 13 Diagnostic excitation lead, diagnostic plug X 1 3/Ter. B
Ter. 14 Ground Ter. 31
Ter. 15 Unoccupied
Ter. 16 Ground actuation for injection valve Y 7, cylinder 3
Ter. 17 Ground actuation for injection valve Y 7, cylinder 1
Ter. 18 Battery Ter. 30
Ter. 19 Ground Ter. 31
Ter. 20 Unoccupied
Ter. 21 Ground actuation for charge pressure bypass valve Y 12
Ter. 22 Ground actuation for engine telltale
Ter. 23 Unoccupied
Ter. 24 Ground Ter. 31
Ter. 25 Ground actuation for hot wire mass air flow meter P 44 / Ter. 4, 'burn off' signal
Ter. 26 Ground, hot wire mass air flow meter P 44/Ter. 2
Ter. 27 Battery Ter. 1 5
Ter. 28 Signal, oxygen sensor P 32
Ter. 29 Unoccupied
Ter. 30 Ground supply for:
knock sensor P 46
coolant temperature sensor P 12
intake air temperature sensor P 29
throttle valve potentiometer P 34
Ter. 31 Ground actuation for hot start valve
Ter. 32 Tj signal for hoard computer
Ter. 33 Unoccupied
Ter. 34 Ground actuation for injection valve Y 7, cylinder 2
Ter. 35 Ground actuation for injection valve Y 7, cylinder 4
Ter. 36 Ground actuation for fuel pump relay K 68/Ter. 85
Ter. 37 Voltage supply for:
control unit K 61
hot wire mass air flow meter P 44/Ter. 5
Ter. 38 Unoccupied
Ter. 39 Unoccupied
Ter. 40 Input signal, air conditioning compressor
Ter. 41 Input switch, air conditioning ready
Ter. 42 Ground Ter. 31
Ter. 43 Tachometer
Ter. 44 Signal, Intake air temperature sensor P 29
Ter. 45 Signal, coolant temperature sensor P 12
Ter. 46 Unoccupied
Ter. 47 Unoccupied
Ter. 48 Signal, inductive pulse pick up P 35/Ter. 2
Ter. 49 Ground, inductive pulse pick up P 35/Ter. 1
Ter. 50 Unoccupied
Ter. 51 Unoccupied
Ter. 52 Recognition reverse gear
Ter. 53 Signal, throttle valve potentiometer P 34/Ter. 3
Ter. 54 Unoccupied
Ter. 55 Bi directional data lead, diagnostic plug X 13/Ter. 6

[palamut]

is the c20xe ecu connector same of the let? i know there is 1 extra board with pins directly going out on c20let ecu makes the outside pins 3 rows.

[oliverweb]

I have to investigate this a bit.

[redtopnutta]

want to bring this back up as im doing this soon, as far as i can see the loom has a vaccum, amel valve, and intake temp sensor, is the maf sensor plug the same on both looms?

[DarrenH]

is the c20xe ecu connector same of the let? i know there is 1 extra board with pins directly going out on c20let ecu makes the outside pins 3 rows.

no. pin 1 is at the opposite end on 20XE (motronic 2.5) plug

[redtopnutta]

any more info on this ?

[dewismotorsport]

you can run a turbo'd xe on just the standard XE ecu with a mbc and set up on a wideband, don't get me wrong it's not perfect but does work, personally i'd just sell the xe loom and buy a complete let loom tbh