So who wants their ECU's "Chromed"?

[elyria_boy]

Are the links down again or have they been re-hosted someplace else?

[Greg E]

Are the links down again or have they been re-hosted someplace else?

Rehosted for you man!

Also updated the Q/A post!

[99 vr4]

Little update. This is wrong. The periphery needs to be disabled thus disabling the entire purge system.

Thanks to Brett for researching the manual and pointing me in the right direction with this. I came up with an idea to keep this system enabled without the Fuel Tank sensor on the earlier cars. I'll update my purge control thread with details.

Also thanks to Adam for doing the leg work with the solenoids and circuit tracing on the ECU. It appears all the 93-97 cars will for sure be able to keep the purge system with the flashable ECUs. Some testing will need to be done on the 91/92 cars.

50 points to both of you guys!

SO, on the 96 with the clicking solenoid I figured out the problem was he wired the purge solenoid (supposed to be pin 16 on the flash ECU) to the vent solenoid output (pin 35 on the flash ECU). There is no vent solenoid on the 91-97 cars and in the 99 ROM, this solenoid behaves differently than the purge. I'm not going to look too much into that area unless someone wants to use that output for something.

What this means is the 98/99s have 2 purge solenoids and the 91-97 cars have only 1. The purge sucks the vapors out of the charcole canister into the intake. The vent relieves into the engine bay. I'll get pics of it later when it's light outside.

Correction... On the 99... The EVAP Purge draws a vacuum by drawing fumes into the intake. The gas tank pressure goes to vacuum. The gas tank pressure differential sensor detects this. The EVAP Vent holds it. The pressure sensor detects this. The EVAP Vent releases the pressure (by allowing air into the negative pressurized system). The pressure sensor detects this.

[Greg E]

Correction... On the 99... The EVAP Purge draws a vacuum by drawing fumes into the intake. The gas tank pressure goes to vacuum. The gas tank pressure differential sensor detects this. The EVAP Vent holds it. The pressure sensor detects this. The EVAP Vent releases the pressure (by allowing air into the negative pressurized system). The pressure sensor detects this.

I see my error. It doesn't relieve into the engine bay, it draws air in from the engine bay.

After our talk, it appears for sure on the 1G cars, this is done mechanically. Still gotta confirm for the 96/97 cars but from memory, they are the same.

50 more points for Brett! Brett takes the lead!

[99 vr4]

Thanks Man . . . I will hopefully have that file we spoke about done by weeks end!

[99 vr4]

Greg - I am done with the EvoScan v2.9 conversion files. I found something VERY interesting while testing inputs with a voltage source . . .

PRIMARY FRONT 02 - PIN 72 - RequestID 3E
PRIMARY REAR 02 - PIN 71 - RequestID 13
SECONDARY FRONT 02 - PIN 74 - RequestID 3D
SECONDARY REAR 02 - PIN 73 - RequestID 3C

[fridayda13th]

In evoscan is the expose to be a value under function for knock sum because mine is empty it just has a x?

[99 vr4]

X means to just display the raw value of the request id. So that is correct.

[Jesters Deadd]

Greg - I am done with the EvoScan v2.9 conversion files. I found something VERY interesting while testing inputs with a voltage source . . .

PRIMARY FRONT 02 - PIN 72 - RequestID 3E
PRIMARY REAR 02 - PIN 71 - RequestID 13
SECONDARY FRONT 02 - PIN 74 - RequestID 3D
SECONDARY REAR 02 - PIN 73 - RequestID 3C

Very interesting! I had a sneaky suspicion that my call outs were wrong. The manual nomenclature is funny too. It calls the precats the front and the post cats the rear. I like primary and secondary though.

[99 vr4]

What the manual says is left front is primary rear..

First I verified the primary rear went to pin 71 with a meter... And so on

Then I verified request 13 responded to voltage on pin 71 using a voltage source with the ecu on my test bench out of the car.... And so on

This confirms that all of the bank 1/bank 2 and front bank/rear back definitions in evoscan are back words. It was assumed that since 13 is used on a 4 cylinder as the primary that on a 6 cylinder it would be the primary on the right bank, or front. But that was our american thinking... Right is first. In japan, left is first. As on the left bank or rear... Fixed in the new xml