Right, but will the CELs associated with FAA bit.11 and FCA bit.9 be prevented if it always runs 0% duty cycle? I thought the FCA bit was for a startup check.

 

Its been a month or so since I looked at the code, but my recollection is that those periphery bits don't need to be changed is EGR if disabled using the 1D table.

 

So the "perfect" way to disable the EGR is to....

set Periphery 2 FCA bit 9 to 0 to disable the EGR test
and
set EGR system enable/disable to 0 to disable the EGR itself

 

^ I am wondering the same now...

 

Will this prevent it from throwing one for being unplugged also?

 

I still have all the junk on my car I simply wanted that cat lite off - cold cruise timing retard out of the picture because I'm catless.

 

Yes, that's the way to do it. Periphery 2 bit 9 will kill the EGR test, and the 1D table will kill EGR operation and also disable the EGR ignition advance algorithm.

 

I have FCA bit 9 = 0 and no other changes. EGR system is on my shelf in teh garage. I haven't had any issues. Cold start is perfect even at 10*F

 

Yep, the CEL I got yesterday with FAA and FCA EGR bits stock was p0401 - EGR insufficient flow. Weird as it was long after startup. I'm going to disable the FCA bit and see if it happens again.

(And yes, the EGR was disabled at the 1D table).

 

Yeah, FCA bit 9 needs to be disabled.

 

(apologize for bringing back a semi dead thread)

im believing my high cold idle is directly related to disabling the EGR bit. is this true?

 

I installed the tephra v7 recompile with JDM map and unless I disable egr test my car will not idle right at all. How do I set my egr sys back to 100% stock without affecting the rest of the rom.

 

Hi cronz305 - We're going to need a little more background information before anyone will be able to help or suggest a solution:

What is your mod list? (e.g. stock IX MR with cat back exhaust)

What version ROM were you on before you made the change to V7?

What version ROM are you now on (e.g. 89590715)?

Do you have all the EGR hardware installed?

Do you have a backup of the ROM prior to making the switch to V7?

 

MODS in signature

i use the 88590715 V7 (and always been on V7)
untouched EGR system (verified EGR vac lines are secure)...

that is my info but i think i might have found the problem.

I re-enabled the EGR sys test on the V7 88590715 recompile rom and it wouldnt idle right at all... i then noticed a step in the JDM MAP sensor section of the V7 88590715 recompile rom.

so i had it re enabled in the ECU Periphery (FAA) bit.11 but i had my rom set to:
do you think that might be the problem??

also i noticed there is a difference in the V7 88590715 rom vs the V7 88590715 recompiled rom under the ECU Periphery (FAA) bit.11.

picture attached.

 

Don't think so. FAA bit 11 enables EGR when coolant temp is below 154 deg F which would mess up your warmup drive cycle but not your idle. Unless you changed the EGR duty cycle table, there is no EGR at idle.

All changing Periphery 2 to EDDF does is to disable the P0140 EGR test and the code that would otherwise be thrown, so this doesn't affect your idle.

I'd look in other directions:
1. Check for any leaks in your inlet pathway post MAF (see boost leak detection with a constant pressure source and soapy water spray)
2. Check your throttle plate is closing completely by pulling the UICP and looking into the throttle body. Clean it if necessary with carb cleaner but leave the graphite colored molybdenum coating on the inside of the TB to prevent the plate from sticking.
3. Set base idle speed as best you can using the BISS (basic idle setting screw on top of throttle body). Use the Evoscan Actuators button to activate "speed adj. screw mode" to park the ISCV (idle speed control valve) first. Try to set the idle speed ~50 RPM below where you want to idle.
4. Adjust the Target Minimum Idle tables in Ecuflash to establish the set point for RPM that the ISCV tries to maintain.
5. If all that doesn't work pull your ISCV out and make sure the ridges on the barrel that moves in and out haven't worn off. For the older type valves this is a common problem which causes them to remain stuck in the same position and unable to adjust idle speed.

Post up what you find.