Has anyone had a Hewitt bypass quit working? (1 Viewer)

[folivier]

Here's the story, my 2006 GX470 started throwing the codes and go into limp mode this past winter and a few times this summer. So I ordered the Firewater Marine bypass kit. When I installed it there was already a Hewitt bypass installed. I uninstalled the Hewitt bypass and installed the Firewater kit. I haven't put enough miles on it to know if it works or not and haven't had time yet to see if the block off plates are already installed.
Just wondering if I have a different problem or the Hewitt kit did go bad?

 

[Jstawgn]

There are a few known incidents that Hewitt themselves know with first generation bypass. It can go bad. That is just from reading Paul Hewitt's comments on GXOR.

I am batting different issue with rutech bypass. Lately its been giving me P0113 for intake temperature sensor current high. Replace MAF sensor with OEM and it still comes back randomly on hot days.

 

[Rednexus]

Here's the story, my 2006 GX470 started throwing the codes and go into limp mode this past winter and a few times this summer. So I ordered the Firewater Marine bypass kit. When I installed it there was already a Hewitt bypass installed. I uninstalled the Hewitt bypass and installed the Firewater kit. I haven't put enough miles on it to know if it works or not and haven't had time yet to see if the block off plates are already installed.
Just wondering if I have a different problem or the Hewitt kit did go bad?

I have a Hewitt kit on my 2007. It went into limp home mode 2X last winter, under cold conditions where I hopped straight on the freeway after starting the engine. However, I've also found that the ground wire for the Hewitt kit likes to come unplugged. So I crimped down the connector a bit more. Not sure if that was my issue or if the Hewitt kit is no longer working. I'll see how it does later this winter and then evaluate other options.

 

[Rednexus]

There are a few known incidents that Hewitt themselves know with first generation bypass. It can go bad. That is just from reading Paul Hewitt's comments on GXOR.

I am batting different issue with rutech bypass. Lately its been giving me P0113 for intake temperature sensor current high. Replace MAF sensor with OEM and it still comes back randomly on hot days.

It could be your MAF connector myself. I've had the OEM one go bad - and then my splice job on the replacement to bad later one. A bad MAF plug will cause all sorts of codes and issues. Others have also had this problem. I've since spliced in a new one, including making the connector easily replaceable by adding a Deutsch connector to the OEM harness, then another Deutsch connector to the MAF pigtail.

 

[Jstawgn]

Good idea. I need to check the connector.

 

[folivier]

Interesting Rednexus. My MAF plug was broken and taped together. That could be my problem.
Do you have the part #'s for the plug you used?

 

[Rednexus]

Interesting Rednexus. My MAF plug was broken and taped together. That could be my problem.
Do you have the part #'s for the plug you used?

I used one from Amazon, but the pigtail was kind of short. Since your MAF wiring isn't pre-hacked/cut like mine, that might not be a big deal. You could cut off the OEM MAF plug, add a Deutsch connector in it's place, and then add a Deutsch connector on the end of the MAF pigtail. Or you can direct-splice, but the splices have to be really good to not have issues down the line like my rig did.

I'd post pictures of my new/improved splice job, but the forum is giving me a server error message. Here's the MAF connector.

Amazon.com: IXGKHC Mass Air Flow Sensor Meter MAF Harness Connector Plug 22204-31020 for Toyota Venza Highlander Matrix Avalon RAV4 Camry Corolla Sienna for Lexus is F IS250 IS350 ES350 GS350 and Scion xB xD tC : Automotive

Buy IXGKHC Mass Air Flow Sensor Meter MAF Harness Connector Plug 22204-31020 for Toyota Venza Highlander Matrix Avalon RAV4 Camry Corolla Sienna for Lexus is F IS250 IS350 ES350 GS350 and Scion xB xD tC: Mass Air Flow - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

EDIT: Server is working.

Here is the new pigtail I made:

And it installed. The Deutsch connector on the ECU side can be seen attached to my ARB twin mount.

 

[wrmathis]

I used one from Amazon, but the pigtail was kind of short. Since your MAF wiring isn't pre-hacked/cut like mine, that might not be a big deal. You could cut off the OEM MAF plug, add a Deutsch connector in it's place, and then add a Deutsch connector on the end of the MAF pigtail. Or you can direct-splice, but the splices have to be really good to not have issues down the line like my rig did.

I'd post pictures of my new/improved splice job, but the forum is giving me a server error message. Here's the MAF connector.

Amazon.com: IXGKHC Mass Air Flow Sensor Meter MAF Harness Connector Plug 22204-31020 for Toyota Venza Highlander Matrix Avalon RAV4 Camry Corolla Sienna for Lexus is F IS250 IS350 ES350 GS350 and Scion xB xD tC : Automotive

Buy IXGKHC Mass Air Flow Sensor Meter MAF Harness Connector Plug 22204-31020 for Toyota Venza Highlander Matrix Avalon RAV4 Camry Corolla Sienna for Lexus is F IS250 IS350 ES350 GS350 and Scion xB xD tC: Mass Air Flow - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

EDIT: Server is working.

Here is the new pigtail I made:
View attachment 3967766
And it installed. The Deutsch connector on the ECU side can be seen attached to my ARB twin mount.
View attachment 3967767

i broke the MAF plug on my tacoma, and I got a pig tail but i didnt splice it in. i depinned the old connector and just used the new connector body and plug the old pins into new body and everything worked fine. didnt have to splice anything and worry about it not being working right

 

[Rednexus]

i broke the MAF plug on my tacoma, and I got a pig tail but i didnt splice it in. i depinned the old connector and just used the new connector body and plug the old pins into new body and everything worked fine. didnt have to splice anything and worry about it not being working right

My connector was not broken and physically looked fine. It also snapped onto the MAF fine as well. I think the issue was the actual pins/wires inside of the connector. For both instances, the issue fixed itself as soon as I put on a new MAF connector. The MAF wires are only 24 or 26 ga wire so the they are rather fragile when they get old. Or, perhaps the connector pins aren't gripping the pins of the MAF very well. The MAF is pretty sensitive; if there is a poor connection or slightly higher resistance due to a wiring issue, the ECU will mis-read engine airflow and cause all sorts of strange problems.

 

[folivier]

I'll use Deoxit on the connector pins when I redo it. Great stuff!