S14 SR20 ECU differences/problems - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

darius_tii · 10-26-2009, 10:37 AM

Been having some really strange issues with my S14 SR20 ZENKI motor and was wondering if anyone on here could help

So my car had been runnig strange and I had a RED WE ECU in it.
I got a Black WC ECU and put it in the car, and the car instantly ran better. ALOT better.
Couple days ago, I go to start the car, and it wont start. everything works just NO SPARK at all.
Check everything over, and seems like ECU is the problem.
Take the ECU to my buddies car with an S14 SR and it doesnt start either, so i was convinced it was the ECU
.
But now i read up and it looks like the RED and Black stickers mean that the harness is either for a Zenki or chuki S14 sr20. Wondering if these two ECUs are interchangeable, and if not is that the reason the ECU just went out all of a sudden?

I thought it was a short in my Engine harness, but just want to see if I maybe caused it by running the black WE ecu instead of the RED one.

Any help would be awesome.

Also here is some info on the ECU differneces that i found

E5 is from a 94-96 180sx black top 5 speed
E6 is from a 94-96 180sx blacktop automatic
"RED" WC is from a 95-96 S14 Silvia zenki
"BLACK" WC is from a 96-97 S14 Chuki (transition, different maf plug)
NA is from a 97-98 s14 Silvia kouki 5-speed
62 is from a 91-93 180sx or S13 Silvia 5 speed
63 is from a 91-93 180sx or S13 Silvia automatic
J4 is from a 97-98 180sx Type X 5speed
J5 is 97-98 Type-X Automatic

Also:
S14 Zenki SR20's with Red WC Ecus will have a Rectange MAF plug
S14 chuki sr20's with black WC Ecus will have the oval MAF plug,
S14 Kouki SR20's with black NA ecu will have oval maf plug

62, 63, E5, E6, are all interchangable and will run any 5-speed 91-96 SR20DET S13
J4 and J5 will plug into but will not work on the pre 97 S13 SR20DET's without moving about 6 wires at the ECU plug.
Red and black WC/WE Ecus for S14 sr20's are interchangable, just watch the maf plug difference.
S15 maf (oval plug) and S14 Oval Maf's are interchangable.
But black NA ECU has a smaller plug, and simply will not fit on the pre 97- S14 SR20DET harnesses.

Thanks
Darius

rioredstang · 10-26-2009, 09:57 PM

I don't work on sr's as much, but when you think you have a ecu problem first check powers and grounds to ecu. If you don't have spark, do you have injector pulse? Does the check engine light come on? Can you pull codes from ecu? Will the computer communicate with a scanner? Try to induce a code by unplugging maf to see if the computer will self test. If you have injector pulse I would look to the ignition side. Check ign. module and coil.

10-26-2009, 10:37 AM	#1
darius_tii Zilvia Junkie Join Date: Sep 2005 Location: NorCal San Jose Posts: 470 Trader Rating: (4)	S14 SR20 ECU differences/problems Been having some really strange issues with my S14 SR20 ZENKI motor and was wondering if anyone on here could help So my car had been runnig strange and I had a RED WE ECU in it. I got a Black WC ECU and put it in the car, and the car instantly ran better. ALOT better. Couple days ago, I go to start the car, and it wont start. everything works just NO SPARK at all. Check everything over, and seems like ECU is the problem. Take the ECU to my buddies car with an S14 SR and it doesnt start either, so i was convinced it was the ECU . But now i read up and it looks like the RED and Black stickers mean that the harness is either for a Zenki or chuki S14 sr20. Wondering if these two ECUs are interchangeable, and if not is that the reason the ECU just went out all of a sudden? I thought it was a short in my Engine harness, but just want to see if I maybe caused it by running the black WE ecu instead of the RED one. Any help would be awesome. Also here is some info on the ECU differneces that i found E5 is from a 94-96 180sx black top 5 speed E6 is from a 94-96 180sx blacktop automatic "RED" WC is from a 95-96 S14 Silvia zenki "BLACK" WC is from a 96-97 S14 Chuki (transition, different maf plug) NA is from a 97-98 s14 Silvia kouki 5-speed 62 is from a 91-93 180sx or S13 Silvia 5 speed 63 is from a 91-93 180sx or S13 Silvia automatic J4 is from a 97-98 180sx Type X 5speed J5 is 97-98 Type-X Automatic Also: S14 Zenki SR20's with Red WC Ecus will have a Rectange MAF plug S14 chuki sr20's with black WC Ecus will have the oval MAF plug, S14 Kouki SR20's with black NA ecu will have oval maf plug 62, 63, E5, E6, are all interchangable and will run any 5-speed 91-96 SR20DET S13 J4 and J5 will plug into but will not work on the pre 97 S13 SR20DET's without moving about 6 wires at the ECU plug. Red and black WC/WE Ecus for S14 sr20's are interchangable, just watch the maf plug difference. S15 maf (oval plug) and S14 Oval Maf's are interchangable. But black NA ECU has a smaller plug, and simply will not fit on the pre 97- S14 SR20DET harnesses. Thanks Darius __________________ darius

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10-26-2009, 09:57 PM	#2
rioredstang Join Date: Jan 2009 Location: Chattanooga, TN Age: 52 Posts: 29 Trader Rating: (0)	I don't work on sr's as much, but when you think you have a ecu problem first check powers and grounds to ecu. If you don't have spark, do you have injector pulse? Does the check engine light come on? Can you pull codes from ecu? Will the computer communicate with a scanner? Try to induce a code by unplugging maf to see if the computer will self test. If you have injector pulse I would look to the ignition side. Check ign. module and coil.

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