broken fuel pump cirquit??

[miniman]

Hello

I have a MS II vith V3 board. I have been running this for three years on my TPI. This winter i have replaced the wiring harness and doing so i accidently put a relay in that sent +12 volts into pin 37 in the ms when the ignition was turned on. Now the fuel pump wont run. The fuel pump diod on the stim doesn´t light up either. Can anybody advice in what components i could have destroyed by doing this? The car starts upp nicely if i bypass the fuel pump directly to the battery. I have also uppgraded to the latest firmware for the msII.

Best regards

Anders

[trakkies]

Q2 and possibly Q19. They are both so cheap it might be worth just replacing the pair while you've got the MS on the bench.

[miniman]

Thanks, i will do so

Anders

[miniman]

Hello.

I can´t get a hold of the exact components in Sweden. The subtitutes suggested by the electronics company for ZTX450-ND is ZTX690B with this specs:

ZTX690B
Vendor Diodes/Zetex
Category
Discrete Semiconductor Products
Transistor Type
NPN
Voltage - Collector Emitter Breakdown (Max) 45V
Current - Collector (Ic) (Max) 2A
Power - Max 1W
DC Current Gain (hFE) (Min) @ Ic, Vce 400 @ 1A, 2V
Vce Saturation (Max) @ Ib, Ic 500mV @ 5mA, 1A
Frequency - Transition 150MHz
Current - Collector Cutoff (Max)


The substitute for 2N3904FS-ND is 2N3904 with these specs:
TO-92
Polarity NPN
current kollektor-emitter 40 V
Kollektorpower 0.2 A
Frequency - Transition 300 MHz
gain 30...300

Can anybody advise if these parts are ok to use? Don´t wan´t to do more damage than i have already done.

Regards

Anders

[trakkies]

Just about any NPN transistors would do - provided the output one can handle 0.5 amp or so. Obviously check the pin outs if using different ones.

[miniman]

Hello.

Thank you very much for helping me with this. I finally got the time to fix this. I replaced Q2 and Q19 and now it works again.

Regards

Anders