Pics of a 99 1mz harness I'm working on

mr220v · 11-20-2008, 12:45 PM

I've been working on this harness for the past few weeks:

http://69.15.41.214/mr2/v6pics/v61.jpg

http://69.15.41.214/mr2/v6pics/v62.jpg

http://69.15.41.214/mr2/v6pics/v63.jpg

http://69.15.41.214/mr2/v6pics/v64.jpg

It's a 99 avalon 1mzfe. I reorganized the harness so that the ecu will actually mount on the driver's side of the trunk. I got the wiring manual for it, and found tons of circuits to eliminate, so the avalon body plugs are gone.

It's taken me a bit longer to do this one because I've been looking for an easier way to fool the automatic transmission control part of this ecu.

Main thing is I've found a way to "deactivate" the clutch lockup pin. Basically I'm going to feed pin STP 12v. This is the signaling wire to the ecu that the brake pedal has been pressed. The causes the ecu to turn off pin SL to disengage the transmission. No code should be registered if no signal is to be sent to the missing solenoid.

The other part is 12v to Pin L. This forces the ecu in gear, and causes current to only be sent from pin S1, but not s2.

This leaves potentially only pin s1 to be tricked. Before we add the resistor, we'll see if it's actually necessary. If we need to trick it, we'll use a 7ohm injector resistor.

This harness will also have a working obd2 port, and a rear o2.

conor · 11-20-2008, 02:38 PM

If that's an US market 5-plug 1MZ ECU... you don't have to do all that. You just have to ground one pin on the ECU and it goes into M/T mode..

Then again.. saw that's an Avalon ECU.. may/may not be possible there. I know on the Camry/Solara it is. And for the cost of a cheap junkyard ECU, that's a big hassle

mr220v · 11-20-2008, 02:51 PM

This is a 99 avalon. It's the year prior to vvti. It has the same ecu plugs as the vvti harness though.

A few years prior to this one, the earlier 1mz's had the crazy looking grey plugs like what's found on the supra. I believe those were a little easier to trick.

You don't remember which pin it was do you? I thought it was just adding 12v to L?

conor · 11-20-2008, 05:03 PM

On my 2000 Camry 1MZ ECU (non-VVTI), it's pin 24 on connector [E11]. I had to add a pin to the connector for it.

On the wiring diagram, it's labeled as "ADJ1" on the ECU diagram and the wire is labeled (M/T).

Beware, running in M/T mode means that you need to use normal 4-wire O2 sensors rather than A/F Ratio sensors (if your A/T requires them anyway). Depending on year and 49-state/CA, that may or may not apply to you. If you switch modes and the ECU gets PO'd about the sensors and refuses to go into closed loop mode, you know you've got the wrong kind

mr220v · 11-20-2008, 05:31 PM

That's almost too easy. Glad I asked.

I'm not too worried about the o2 situation. I'm sure he'll get o2's if he doesn't already have them.

He may need a new ecu anyway. I'm not sure if this one has the immobilizer or not?

I guess I'll leave the 12v to pins stp and L though. Can't hurt.

Wish that pin24 trick worked on the vvti ecu's.

canadam · 11-20-2008, 07:08 PM

What would something like this cost a customer?

mr220v · 11-21-2008, 10:06 AM

I'm thinking $400 or $450 maybe?...haven't decided yet. The rule is that this one runs properly before I make more.

11-20-2008, 12:45 PM	#1 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 1,320 Thanks: 13 Thanked 98 Times in 83 Posts iTrader Rating: (7/100% )	Pics of a 99 1mz harness I'm working on I've been working on this harness for the past few weeks: http://69.15.41.214/mr2/v6pics/v61.jpg http://69.15.41.214/mr2/v6pics/v62.jpg http://69.15.41.214/mr2/v6pics/v63.jpg http://69.15.41.214/mr2/v6pics/v64.jpg It's a 99 avalon 1mzfe. I reorganized the harness so that the ecu will actually mount on the driver's side of the trunk. I got the wiring manual for it, and found tons of circuits to eliminate, so the avalon body plugs are gone. It's taken me a bit longer to do this one because I've been looking for an easier way to fool the automatic transmission control part of this ecu. Main thing is I've found a way to "deactivate" the clutch lockup pin. Basically I'm going to feed pin STP 12v. This is the signaling wire to the ecu that the brake pedal has been pressed. The causes the ecu to turn off pin SL to disengage the transmission. No code should be registered if no signal is to be sent to the missing solenoid. The other part is 12v to Pin L. This forces the ecu in gear, and causes current to only be sent from pin S1, but not s2. This leaves potentially only pin s1 to be tricked. Before we add the resistor, we'll see if it's actually necessary. If we need to trick it, we'll use a 7ohm injector resistor. This harness will also have a working obd2 port, and a rear o2. Last edited by mr220v; 11-20-2008 at 01:43 PM.

11-20-2008, 02:51 PM	#3 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 1,320 Thanks: 13 Thanked 98 Times in 83 Posts iTrader Rating: (7/100% )	This is a 99 avalon. It's the year prior to vvti. It has the same ecu plugs as the vvti harness though. A few years prior to this one, the earlier 1mz's had the crazy looking grey plugs like what's found on the supra. I believe those were a little easier to trick. You don't remember which pin it was do you? I thought it was just adding 12v to L? Last edited by mr220v; 11-20-2008 at 03:23 PM.

11-20-2008, 07:08 PM	#6 (permalink)
canadam MidshipExpress Join Date: Feb 2005 Location: Beautiful British Columbia Posts: 9,319 Thanks: 111 Thanked 121 Times in 107 Posts My Google Map iTrader Rating: (28/100% )	What would something like this cost a customer? __________________

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

11-20-2008, 02:38 PM	#2 (permalink)
conor Dead From Bad Intentions Join Date: Feb 2005 Location: Roseville, CA Posts: 858 Thanks: 19 Thanked 22 Times in 21 Posts Blog Entries: 2 My Google Map iTrader Rating: (1/100% )	If that's an US market 5-plug 1MZ ECU... you don't have to do all that. You just have to ground one pin on the ECU and it goes into M/T mode.. Then again.. saw that's an Avalon ECU.. may/may not be possible there. I know on the Camry/Solara it is. And for the cost of a cheap junkyard ECU, that's a big hassle

11-20-2008, 05:03 PM	#4 (permalink)
conor Dead From Bad Intentions Join Date: Feb 2005 Location: Roseville, CA Posts: 858 Thanks: 19 Thanked 22 Times in 21 Posts Blog Entries: 2 My Google Map iTrader Rating: (1/100% )	On my 2000 Camry 1MZ ECU (non-VVTI), it's pin 24 on connector [E11]. I had to add a pin to the connector for it. On the wiring diagram, it's labeled as "ADJ1" on the ECU diagram and the wire is labeled (M/T). Beware, running in M/T mode means that you need to use normal 4-wire O2 sensors rather than A/F Ratio sensors (if your A/T requires them anyway). Depending on year and 49-state/CA, that may or may not apply to you. If you switch modes and the ECU gets PO'd about the sensors and refuses to go into closed loop mode, you know you've got the wrong kind

11-20-2008, 05:31 PM	#5 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 1,320 Thanks: 13 Thanked 98 Times in 83 Posts iTrader Rating: (7/100% )	That's almost too easy. Glad I asked. I'm not too worried about the o2 situation. I'm sure he'll get o2's if he doesn't already have them. He may need a new ecu anyway. I'm not sure if this one has the immobilizer or not? I guess I'll leave the 12v to pins stp and L though. Can't hurt. Wish that pin24 trick worked on the vvti ecu's.

11-21-2008, 10:06 AM	#7 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 1,320 Thanks: 13 Thanked 98 Times in 83 Posts iTrader Rating: (7/100% )	I'm thinking $400 or $450 maybe?...haven't decided yet. The rule is that this one runs properly before I make more.