So who wants their ECU's "Chromed"?

[Greg E]

Correct me if im wrong, but it should work with the SL ecu's also..

The SL ecu lacks the drivers for the stock boost gauge and BCS.

Edited out mis-info...

[BlackStealth]

Regardless of what your read, the knock sensor circuitry is different between the VR4 and SL ecu as well. It may work "good enough" but I'm not going to recommend anyone use it.

I checked both a 98 DOHC VR4 and a 98 DOHC SL ECU and the knock circuit are the same. The 98 SOHC ECU knock circuit is different.

[Jeff V.]

I have also examined multiple ECUs and I will back up BlackStealth's assessment.

[TurboSinceBirth]

I bought a 98 SL ECU and also could tell that the knock circuitry is identical to the VR-4 ECU. I have no problems using this ECU or this ROM. You can't ignore the data:

Knock circuit layout

1998 3000GT SL 
MMC P/N MD347251
MFG P/N E2T61389 H3
PCB P/N JE331B157D

Con1-Pin 91 > R314 (TOP) > C45 (BOTTOM) > R315 (TOP) > IC2-Pin 78 < IC2-Pin 80 > IC1-Pin 92

R314 = 51 KOhm
C45 = 0.02 uF
R315 = 6.2 KOhm
IC2 = Mitsu Electronics E328 logic level converter
IC1 = Renesas H8/539F microcontroller, A/D input 6

1999 3000GT VR4
MMC P/N MD360163
MFG P/N E2T61495 H1
PCB P/N JE331B32804B

Con1-Pin91 > R71 (TOP) > C62 (BOTTOM) > R73 (TOP) > IC7-Pin 78 < IC7-Pin80 > IC9-Pin 92

R71 = 51 KOhm
C62 = 0.02 uF
R73 = 6.2 KOhm
IC7 = Mitsu Electronics E328 logic level converter
IC9 = Renesas H8/539F microcontroller, A/D input 6

[Jesters Deadd]

How does the AEM do the knock circuit? Is it different from the stock ECu too? Should we not use it either? Just stirring the sh!t. no offense anyone.

[green-lantern]

Not this again

[Greg E]

I have also examined multiple ECUs and I will back up BlackStealth's assessment.

What was the debate between you and Brett about this?

Edit: nvm, found the thread on 3STech, the debate concerned the 3/S SOHC ECUs.

I stand corrected.

[rdmelton]

Awesome work Greg. I downloaded v1.0 a while ago but just now got around to trying it. On that topic, I tried to download the most recent version, but it doesn't work. v1.0 seems to work fine for now anyway.

I recently deleted the EGR, evap, and rear o2 sensors. I have been able to disable most of the CELs except for P0141 Heated Oxygen Sensor Heater circuit Bank 1 Sensor 2. In periphery0 bit02 (0=Disable downstream O2 heater and sensor, both banks) , I changed it to 0, but it still didn't get rid of the CEL. I looked through the rest of the periphery bits but didn't see one that listed P0141 or bank 1 sensor 2. Anyone else have this issue?

[aaronatstate]

Awesome work Greg. I downloaded v1.0 a while ago but just now got around to trying it. On that topic, I tried to download the most recent version, but it doesn't work. v1.0 seems to work fine for now anyway.

I recently deleted the EGR, evap, and rear o2 sensors. I have been able to disable most of the CELs except for P0141 Heated Oxygen Sensor Heater circuit Bank 1 Sensor 2. In periphery0 bit02 (0=Disable downstream O2 heater and sensor, both banks) , I changed it to 0, but it still didn't get rid of the CEL. I looked through the rest of the periphery bits but didn't see one that listed P0141 or bank 1 sensor 2. Anyone else have this issue?

In the Periphery2 Bits, the only ones I have set to 1 are 00, 04, 05, 06, and 08. I don't have any CELs.

[75blackray]

I'm a little lost in this thread. But if I'm reading correctly, there are members running this with obd1 cars using 98/99 ecu's? Without hijacking this thread too much, what would I need besides a 98/99 vr4 ecu to make this work on my 92tt?

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