Teensy 3.5 no fuel pump trigger

Teensy 3.5 no fuel pump trigger#41053

By caldina3sgte - Fri Feb 21, 2020 10:32 am

- Fri Feb 21, 2020 10:32 am #41053

Hello,

Teensy 3.5 with teensy adapter v1.0
02/2020 firmware
4.3c board

No fuel pump trigger when ignition turned on even on cranking. Do i need to modify or jumper something in the teensy adaptor?

Re: Teensy 3.5 no fuel pump trigger#41058

By noisymime - Fri Feb 21, 2020 9:11 pm

- Fri Feb 21, 2020 9:11 pm #41058

Are you using the default fuel pump pin?

Re: Teensy 3.5 no fuel pump trigger#41064

By caldina3sgte - Sat Feb 22, 2020 2:50 am

- Sat Feb 22, 2020 2:50 am #41064

noisymime wrote:Are you using the default fuel pump pin?

Thabks for the reply.
Yes i am using the default fuel pump pin

Re: Teensy 3.5 no fuel pump trigger#41067

By LPG2CV - Sat Feb 22, 2020 9:22 am

- Sat Feb 22, 2020 9:22 am #41067

Hi

Try this

viewtopic.php?uf=18&t=3210&p=38275&hilit=Vvt+FP#p38275

Edit

Assuming you don't have an engine with vvt.

Mere Mortal

Re: Teensy 3.5 no fuel pump trigger#41068

By caldina3sgte - Sat Feb 22, 2020 11:09 am

- Sat Feb 22, 2020 11:09 am #41068

LPG2CV wrote:Hi

Try this

viewtopic.php?uf=18&t=3210&p=38275&hilit=Vvt+FP#p38275

Edit

Assuming you don't have an engine with vvt.

Errr.. Im using the vvt pin to trigger alcohol injection and boost pin is also used.

Is there any work around?

Re: Teensy 3.5 no fuel pump trigger#41069

By pazi88 - Sat Feb 22, 2020 12:51 pm

- Sat Feb 22, 2020 12:51 pm #41069

Do you have any circuitry installed for controlling fuel pump relay? Like ULN?

http://www.youtube.com/pazi88

Re: Teensy 3.5 no fuel pump trigger#41071

By caldina3sgte - Sat Feb 22, 2020 1:34 pm

- Sat Feb 22, 2020 1:34 pm #41071

pazi88 wrote:Do you have any circuitry installed for controlling fuel pump relay? Like ULN?

Hi Pazi,

Yes i have. actually everything is working fine with the mega 2560, when i switched to teensy 3.5 the fuel pump won't turn on.

I tried also swapping with a different teensy 3.5 but same issue, fuel pump won't trigger but when cranking it detects the rpm and fires the coils it just won't start because fuel pump isn't triggering

Re: Teensy 3.5 no fuel pump trigger#41078

By LPG2CV - Sat Feb 22, 2020 4:00 pm

- Sat Feb 22, 2020 4:00 pm #41078

Expect you've done this . ignition on, does your fp work if you gnd the fp relay?

Mere Mortal

Re: Teensy 3.5 no fuel pump trigger#41080

By caldina3sgte - Sat Feb 22, 2020 4:22 pm

- Sat Feb 22, 2020 4:22 pm #41080

LPG2CV wrote:Expect you've done this . ignition on, does your fp work if you gnd the fp relay?

Hello LPG2CV,

Yes FP working on ignition and grounding the FP relay trigger.

When mega 2560 is everything works flawlessly. When teensy is inserted FP won't trigger.

Also tried EEPROM_CLEAR and re uploading firmware to teensy 3.5, still FP won't trigger