Swap runs perfect w/ECU unpugged!

Runnerfan · 09-07-2009, 03:57 PM

I unplugged my spliced plug(plug D on mine) from the ECU to reset my codes. Then I went to go for a test drive to see if any of my other work helped. I forgot to plug it back in before I started it, but it started fine and ran great except for a high idle(2200 RPM). I decided to go for the test drive like this and it ran perfect, the best it has since being swapped. So now I have a couple questions: Could there be any problems caused by driving it like this? And where should I start to look for the cause in the plug?http://images.ibsrv.net/ibsrv/res/sr...ies/rockin.gif

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vital22re · 09-07-2009, 04:02 PM

the computer runs in default if some of the sensors aren't sending an input. I believe plug d is for the guages and 4wd.

Runnerfan · 09-07-2009, 04:45 PM

My Plug D contains the following wires:

+B
BATT
BK(stop switch)
4wd
STA(pwr from Starter Relay)
Check Engine Light
SP1 (Speedometer)
SDL(OBD II) (Which Doesn't Work)
ACT(AC AMP)
AC1(AC AMP)

So how does the computer even work at all with no power wires plugged in?
How does the igniter even know when to fire without signal from the ECU?

RobD · 09-07-2009, 04:51 PM

I believe my D plug carries those same wires. I'd go unplug it and see if it runs, but with my luck, I'd set the truck and house on fire.

vital22re · 09-07-2009, 06:26 PM

if thats the case.. i'd say you fubar'd your wiring! jk.. maybe the power back feeds somewhere... not sure..

yodathespian87 · 09-08-2009, 08:36 AM

According to my 2001 Tacoma 4x4 manual EWD the Connector D (E8) goes to the igniter, camshaft position sensor, data link connector 1 and injectors, so I find it hard to have it run at all due to the fact its not sending a signal to the ignition control module on when to fire or the ignitors.

???

Runnerfan · 09-08-2009, 07:28 PM

I think that the plug labels and wires they contain changed over the years. My plug D has all the body splices in it. But like you said how does it run? Even though all my sensors are plugged in still, there is no power going in. How does it know what to set timing at, or when to have injectors open? My only thought is that the power going through the sensors somehow powers it enough.

I would really like to know if it is bad to drive it like this. I am worried maybe it will run to lean and hurt something. Any thoughts?

yodathespian87 · 09-09-2009, 05:26 AM

I don't think there would be any damage. The high rev. So you burn more gas.

But I would try to get that rev down but if everything else is good. Are you throwing any codes?

Runnerfan · 09-09-2009, 07:14 AM

When I have the D plug plugged in the engine light is on, but I have tried two different scanners and they both come up with a error saying they can't communicate. I almost think that my ECU is haywire, but I don't want to get a new one on a thought.

If you look at the wires my D plug contains(above) there is not much to screw up. And I have checked a rechecked my wiring about 20 times.

yodathespian87 · 09-09-2009, 08:17 AM

The wires that you have above-
+B
BATT
BK(stop switch)
4wd
STA(pwr from Starter Relay)
Check Engine Light
SP1 (Speedometer)
SDL(OBD II) (Which Doesn't Work)
ACT(AC AMP)
AC1(AC AMP)

Are all in my E5 (A) plug. Those are some pretty striaght forward wires and I don't see how those could get mixed up. Hmm.

I have to splice those ones at well and the only one I haven't done yet is hook up the battery wire to power. It just shouldn't work and thats the confusing part.

Runnerfan · 09-14-2009, 10:19 AM

So I finaly found my problem. Because I swaped my a/t for the m/t I had the start switches by passed with a constant hot. Which then went to my ECU, so my ECU thought that I was constantly trying to start the truck.

Runnerfan · 09-14-2009, 10:25 AM

Now if I can just get my OBD II to work! And hook up my 4wd, then I will be set.

vital22re · 09-14-2009, 02:58 PM

you need power to the ob2 port.. thats why you cant communicate.

09-07-2009, 04:02 PM	#2 (permalink)
vital22re Registered User Join Date: Feb 2006 Location: kirkland washington Posts: 679	the computer runs in default if some of the sensors aren't sending an input. I believe plug d is for the guages and 4wd. __________________ 92 toyota truck 3.4 5spd 4.56 gears magna flow cat and muffler2 1/4 piping isr mod to intake 1.5 bjsfront add a leafs and 2inch lift shackles rear rancho shocks all around sitting on 265/75/r16 nitto terra grapplers

09-07-2009, 04:45 PM	#3 (permalink)
Runnerfan Registered User Join Date: Jun 2009 Posts: 36	My Plug D contains the following wires: +B BATT BK(stop switch) 4wd STA(pwr from Starter Relay) Check Engine Light SP1 (Speedometer) SDL(OBD II) (Which Doesn't Work) ACT(AC AMP) AC1(AC AMP) So how does the computer even work at all with no power wires plugged in? How does the igniter even know when to fire without signal from the ECU? __________________ 92 4Runner 3.4 Swaped Last edited by Runnerfan; 09-07-2009 at 04:47 PM.

09-07-2009, 04:51 PM	#4 (permalink)
RobD Registered User Join Date: Jun 2006 Location: Calgary, AB Posts: 1,726	I believe my D plug carries those same wires. I'd go unplug it and see if it runs, but with my luck, I'd set the truck and house on fire. __________________ 1991 4Runner, 3.4 5VZFE swap, OME shocks/springs, 33" BFG All Terrain T/A KOs, Pioneer head unit, Infinity speakers, XM Satellite radio

09-07-2009, 06:26 PM	#5 (permalink)
vital22re Registered User Join Date: Feb 2006 Location: kirkland washington Posts: 679	if thats the case.. i'd say you fubar'd your wiring! jk.. maybe the power back feeds somewhere... not sure.. __________________ 92 toyota truck 3.4 5spd 4.56 gears magna flow cat and muffler2 1/4 piping isr mod to intake 1.5 bjsfront add a leafs and 2inch lift shackles rear rancho shocks all around sitting on 265/75/r16 nitto terra grapplers

09-08-2009, 08:36 AM	#6 (permalink)
yodathespian87 Contributing Member Join Date: Apr 2008 Location: Colorado Springs, Colorado Posts: 464	According to my 2001 Tacoma 4x4 manual EWD the Connector D (E8) goes to the igniter, camshaft position sensor, data link connector 1 and injectors, so I find it hard to have it run at all due to the fact its not sending a signal to the ignition control module on when to fire or the ignitors. ??? __________________ 86 Pickup 4x2, Manual (Sold) 87 Extra Cab Pickup 4x4, Manual (Sold) 93 4Runner 4x4, Manual, 3.4 Swap In progress 90 4Runner 4x4, Manual, Blown 3.0 (Stripping out for parts then to become a trail rig/camping/fun truck) 94 Lexus SC400, 1UZ, magnaflow exhaust, after market headlights, bought for parts for the swap into the 90 4Runner Last edited by yodathespian87; 09-08-2009 at 08:37 AM.

09-08-2009, 07:28 PM	#7 (permalink)
Runnerfan Registered User Join Date: Jun 2009 Posts: 36	I think that the plug labels and wires they contain changed over the years. My plug D has all the body splices in it. But like you said how does it run? Even though all my sensors are plugged in still, there is no power going in. How does it know what to set timing at, or when to have injectors open? My only thought is that the power going through the sensors somehow powers it enough. I would really like to know if it is bad to drive it like this. I am worried maybe it will run to lean and hurt something. Any thoughts? __________________ 92 4Runner 3.4 Swaped

09-09-2009, 05:26 AM	#8 (permalink)
yodathespian87 Contributing Member Join Date: Apr 2008 Location: Colorado Springs, Colorado Posts: 464	I don't think there would be any damage. The high rev. So you burn more gas. But I would try to get that rev down but if everything else is good. Are you throwing any codes? __________________ 86 Pickup 4x2, Manual (Sold) 87 Extra Cab Pickup 4x4, Manual (Sold) 93 4Runner 4x4, Manual, 3.4 Swap In progress 90 4Runner 4x4, Manual, Blown 3.0 (Stripping out for parts then to become a trail rig/camping/fun truck) 94 Lexus SC400, 1UZ, magnaflow exhaust, after market headlights, bought for parts for the swap into the 90 4Runner

09-09-2009, 07:14 AM	#9 (permalink)
Runnerfan Registered User Join Date: Jun 2009 Posts: 36	When I have the D plug plugged in the engine light is on, but I have tried two different scanners and they both come up with a error saying they can't communicate. I almost think that my ECU is haywire, but I don't want to get a new one on a thought. If you look at the wires my D plug contains(above) there is not much to screw up. And I have checked a rechecked my wiring about 20 times. __________________ 92 4Runner 3.4 Swaped Last edited by Runnerfan; 09-09-2009 at 07:20 AM.

09-09-2009, 08:17 AM	#10 (permalink)
yodathespian87 Contributing Member Join Date: Apr 2008 Location: Colorado Springs, Colorado Posts: 464	The wires that you have above- +B BATT BK(stop switch) 4wd STA(pwr from Starter Relay) Check Engine Light SP1 (Speedometer) SDL(OBD II) (Which Doesn't Work) ACT(AC AMP) AC1(AC AMP) Are all in my E5 (A) plug. Those are some pretty striaght forward wires and I don't see how those could get mixed up. Hmm. I have to splice those ones at well and the only one I haven't done yet is hook up the battery wire to power. It just shouldn't work and thats the confusing part. __________________ 86 Pickup 4x2, Manual (Sold) 87 Extra Cab Pickup 4x4, Manual (Sold) 93 4Runner 4x4, Manual, 3.4 Swap In progress 90 4Runner 4x4, Manual, Blown 3.0 (Stripping out for parts then to become a trail rig/camping/fun truck) 94 Lexus SC400, 1UZ, magnaflow exhaust, after market headlights, bought for parts for the swap into the 90 4Runner

09-14-2009, 10:19 AM	#11 (permalink)
Runnerfan Registered User Join Date: Jun 2009 Posts: 36	So I finaly found my problem. Because I swaped my a/t for the m/t I had the start switches by passed with a constant hot. Which then went to my ECU, so my ECU thought that I was constantly trying to start the truck. __________________ 92 4Runner 3.4 Swaped

09-14-2009, 10:25 AM	#12 (permalink)
Runnerfan Registered User Join Date: Jun 2009 Posts: 36	Now if I can just get my OBD II to work! And hook up my 4wd, then I will be set. __________________ 92 4Runner 3.4 Swaped

09-14-2009, 02:58 PM	#13 (permalink)
vital22re Registered User Join Date: Feb 2006 Location: kirkland washington Posts: 679	you need power to the ob2 port.. thats why you cant communicate. __________________ 92 toyota truck 3.4 5spd 4.56 gears magna flow cat and muffler2 1/4 piping isr mod to intake 1.5 bjsfront add a leafs and 2inch lift shackles rear rancho shocks all around sitting on 265/75/r16 nitto terra grapplers

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