This might be helpful (RB Series electrical stuff)

[goofynick6]

We'll all be wiring up or messing around with the wiring for our RB20 or RB26's soon, so here is some info for them. I just want to consolidate all of the bits and pieces into something useful!

Ecu pinout: rb20det eccs control unit pin layout.

1 Ign signal (power transistor) Cyl #1 2 Ign signal (power transistor) Cyl #5 3 Ign signal (power transistor) Cyl #3 5 engine. A/T control input signal (bt1) 6 Sub electrical fan relay (engine temp switch)7 Tacometeter speed signal9 AC relay (AC cut signal) 10 Ground (ign signal system)11 Ign signal (power transistor) Cyl #6 12 Ign signal (power transistor) Cyl #213 Ign signal (power transistor) Cyl #414 engine. a/t control input sigal (bt2) 15 engine. a/t control input sigal (bt3) 16 ECCS relay 18 fuel pump relay19 Power steering switch 20 Ground (ignition signal system) 21(RX) Receive (control unit data reception) 22 (TX) Transmit (data sent from control unit) 23 Detonation sensor 1 (cyl 1-3) 24 Detonation sensor 2 (cyl 4-6)26 Air flow meter ground 27 Air flow meter intake air quantity signal28 Engine temp sensor 29 Exhaust gas sensor30 Sensor ground (throttle sen, ENG temp)31 clock (synchronization signal) 32 Monitor and check lamp (red)38 Throttle opening output 41 Crank angle sensor (120degree signal) 42 Crank angle sensor (1 degree signal) 43 Ignition switch START signal 44 Neutral switch 45 Ignition switch (IGN) 46 AC switch47 (CHK) Check (diagnosis activation) 48 Throttle sensor power supply 49 Control unit power supply 50 Ground (control unit) 51 Crank angle sensor (120 degree signal) 52 Crank angle sensor (1 degree signal) 53 Vehicle speed sensor 54 Throttle valve switch (idle connection pt) 56 Throttle sensor output signal 57 Throttle valve switch power supply 58 Battery power supply 59 Control unit power supply 60 Ground (control unit) 101 Injector #1 103 Injector #3 104 Fuel pump terminal voltage control output105 Injector #2 107 Injector ground 108 Injector ground 109 Injector power supply 110 Injector #5 112 Injector #4 114 Injector #6 115 exhaust gas sensor heater ground 116 injector ground

Pinout diagram here: http://www.rb20det.com/ecupinout.jpg

[goofynick6]

Here is full wiring diagrams for the RB20DET and it's the same exact as the RB26DETT as well. It is a zip file.

http://meggala.com/R32wiring.zip

Nick

[eh?]

Here is full wiring diagrams for the RB20DET and it's the same exact as the RB26DETT as well. It is a zip file.

http://www.meggala.com/rb25detenglish.html

Nick

That's actually the RB25DET wire schematic, I think the link is here: http://meggala.com/R32wiring.zip

[goofynick6]

That's actually the RB25DET wire schematic, I think the link is here: http://meggala.com/R32wiring.zip

Thanks! I just realized that and was fixing it but you beat me to it.

Wiring schematic for RB20DET is here:

http://www.meggala.com/rb25detenglish.html

Nick

[goofynick6]

Here's an even better pinout diagram!

http://www.r31skylineclub.com/...s.jpg

[goofynick6]

RB25DET PDF file of the ECU pinouts:

http://www.r31skylineclub.com/...t.pdf

[goofynick6]

RB25DET wiring diagram:

http://www.r31skylineclub.com/...m.jpg

[Wulfgang]

No, the RB20DET and RB26DETT wiring diagrams are not the same. One of the differences that I saw was that the 26 injectors are powered through a resistor array whereas the 20's injectors are wired straight to the battery.

[goofynick6]

Megalla's site says they are, and I believe him. Maybe they use different resistance injectors, but rest should be same.

Nick

[PROJECTRB240SX]

Yes the rb26 has a resistor pack setup because they are low impedance injectors.

[Jamison]

So for the rb20 eccs (r32) there is no oil pressure sensor?

My rb20 has an oil pressure sensor on the block, but I cant find the plug that plugs into it. Also does anyone have a diagram of how the harness should plug into the sensors on the engine? And does anyone have a vacuum diagram for the rb20? I bought a motor swap and have no clue where these hoses go.

If anyone has done this swap in the philly area please drop me an e-mail... [email protected] Thanks.

[goofynick6]

I have a vac diagram for the rb20de, but not det, so it wont' help.

Nick

[Wulfgang]

There is a pressure switch/sensor on the block with 2 wires. Since the KA gauge cluster has no pressure gauge, I just spliced the wire for the switch to the wire that goes to the gauge cluster low oil pressure light. That wire is obviously the same as the one that plugs into the KA oil pressure switch, and is located in the lower harness.