Engine cuts out after HICAS light comes on

[BDUB2K21]

Has anyone else had this problem? I can drive my R33 down twisty roads or through the city and it drives fine. However, once I get on the interstate, it only takes about 6 minutes, the HICAS light comes on and then the engine starts cutting out if I try to accelerate. Any help would be greatly appreciated, and yes, I know, I need to delete the HICAS from my car. 

[Dose Pipe Sutututu]

Sounds like there's an electrical fault, the HICAS system is not connected to the ECU in anyway.

 

[joshuaho96]

Have you tried pulling the codes from the ECU and HICAS CU?

[BDUB2K21]

That's what I was thinking, but why would the system work on winding roads but not in the straight interstate?

[BDUB2K21]

On 3/16/2022 at 2:15 AM, joshuaho96 said:

Have you tried pulling the codes from the ECU and HICAS CU?

I just had my ecu changed out for a Haltech and the guy who installed it had been swamped. I plan to take it to him when he isn't as busy. I do not have the standard HICAS CU mounted in the truck either. 

[GTSBoy]

On 3/17/2022 at 6:43 PM, BDUB2K21 said:

I just had my ecu changed out for a Haltech and the guy who installed it had been swamped. I plan to take it to him when he isn't as busy. I do not have the standard HICAS CU mounted in the truck either. 

You really should consider providing all relevant information at the beginning.

Point 1....ECU. Not stock right? So....totally unlikely that anybody else's experience is likely to replicate whatever wiring f**kup was done that caused the HICAS to interfere with engine operation.

Point 2. What do you mean "I do not have the standard HICAS CU"? If you have no HICAS CU, then how can you expect anything other than trouble with your HICAS? I mean - at least you'd hope the electric rear rack would lock up, but it could be quite weird. And the HICAS light shouldn't come on if there's no CU to make it come on....so what is that dashlight wired up to? And how is it that your power steering is still working if you have removed the HICAS CU?

[Dasmbo]

2 Different systems that should not communicate with each other steering and ignition i think you have some serious wiring problems that needs fixed 

[BDUB2K21]

Ok, going back to the beginning...I bought the car pretty much stock with only an after-market engine air filter. No problems with the HICAS light coming on anytime. I watched some videos on YouTube showing how easy it was to delete the HICAS. After I checked the trunk where the standalone HICAS ECU should be, it isn't. I only have one ECU in the trunk and it isn't the HICAS. I started having problems with the HICAS light coming on approx 6 minutes into driving on the interstate and then the engine performance is seriously degraded. Sorry for not explaining every detail before. 

[BDUB2K21]

Also, the HICAS light/ engine degradation problem stated before I changed the main ECU to the Haltech. 

[joshuaho96]

https://www.gtrusablog.com/2016/11/does-your-hicas-light-turn-on-after.html

Start with this diagnostic for the HICAS. Engine diagnostics are separate from HICAS. If someone has messed with the wiring there's realistically no way for any of us to give you a useful answer though. You're going to have to see how it's actually wired up now and go from there.

Edited March 22, 2022 by joshuaho96