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Old 07-28-2010, 06:28 PM   #21
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looking at the pic.

bottom leg goes to ground, middle leg goes to idle valve, top leg goes to input from cpu.

you should put a 1n44 diode on the with leg to 12v, banded end on 12v.
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Old 07-28-2010, 06:48 PM   #22
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Quote:
Originally Posted by Braineack View Post
looking at the pic.

bottom leg goes to ground, middle leg goes to idle valve, top leg goes to input from cpu.

you should put a 1n44 diode on the with leg to 12v, banded end on 12v.
you refering to the IAC mod?

Just making sure
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Old 07-28-2010, 06:58 PM   #23
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si. on the middle leg is what i meant to say about the diode. i assume the tip120 on the case is the driver correct?
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Old 07-28-2010, 07:14 PM   #24
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Quote:
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si. on the middle leg is what i meant to say about the diode. i assume the tip120 on the case is the driver correct?
Its a NTE261 they said its a direct replacment\compatible to the TIP120
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Old 07-28-2010, 07:59 PM   #25
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si. on the middle leg is what i meant to say about the diode. i assume the tip120 on the case is the driver correct?
you sure that diode isn't for pcb v3 layout?
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Old 07-28-2010, 08:20 PM   #26
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Quote:
Originally Posted by Braineack View Post
si. on the middle leg is what i meant to say about the diode. i assume the tip120 on the case is the driver correct?
pcb v1.01 has the diode D9 as a 1n4001 connect to that leg already on installed.
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Old 07-28-2010, 08:24 PM   #27
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aiight, it's just for extra flyback protection.
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Old 07-28-2010, 08:33 PM   #28
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aiight, it's just for extra flyback protection.
good to hear
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Old 08-02-2010, 11:00 AM   #29
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Old 08-02-2010, 11:02 AM   #30
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only 20 more to go!
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Old 08-02-2010, 03:46 PM   #31
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Does the fuel pump get activated by the 12v output from the ecu?
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Old 08-02-2010, 03:55 PM   #32
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no, on a 1.6L car what you should do is build a high side driver circuit.



Use one of the TIP125s that you don't use (the ones with MICA q12 and q9 or whatever they are).

Basically you'll want to take the FP output (banded end of d4) through the 220ohm resistor to the TIP125, you skip the part of the circuit prior to that because you are using Q2/Q19 for this.

get the 12v source from s12c or s12 or banded end of d9.

then the vtec_out should go to 1C on your harness. YOU MUST REMOVE THE ST_SIG FUSE UNDER THE HOOD.

LAMENT TERMS: when the MS grounds the fuel pump, you are instead sending 12v out to 1C, which back-feeds the fuel pump relay and activates the circuit. you must remove the fuse or you will ruin the circuit.


or, you can take the fuel pump ground out your harness, run it across your dash and attach it to the ground on the fuel pump relay itself.

LAMENT TERMS: When the MS tries to ground the fuel pump relay, you acutally ground the fuel pump relay.




if you keep the AFM in place the AFM grounds the fuel pump relay.
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Old 08-02-2010, 04:32 PM   #33
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I'm not quite sure how that circuit is supposed to work. That PNP darlington is backwards.


EDIT: Just looked up the datasheet on the TIP125. The pin numbers are correct, but the symbol is flipped (collector/emitter) in the schematic above.
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Old 08-02-2010, 04:55 PM   #34
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oh. i didnt draw that.

looking at it from above:
-o
[_]
|||
123

1. FP ground in through 27ohm
2. output to 1C, non-banded diode to 12v source
3. 12v source



when I build it I use a 270ohm on the input (leftover from build) and two 1K resistors in series to jump 1. and 3. (leftover from build). This is what they use on the MSPNPs and this circuit is provided on the DIYPNP board and what I use for the fuel pump on 1.6L installs.
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Old 08-02-2010, 05:02 PM   #35
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I've been building the following circuit for all NAs for quite a bit of time, it works rather well too:





Dimitris
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Old 08-02-2010, 05:16 PM   #36
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Quote:
Originally Posted by Joe Perez View Post
I'm not quite sure how that circuit is supposed to work. That PNP darlington is backwards.


EDIT: Just looked up the datasheet on the TIP125. The pin numbers are correct, but the symbol is flipped (collector/emitter) in the schematic above.
Bah.
The circuit works; I used it to drive fuel pump relays on the 1.6 car. Nice catch Joe.

The DIYPNP v1.5 board has something similar onboard already.
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Old 08-02-2010, 05:16 PM   #37
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Quote:
Originally Posted by Braineack View Post
LAMENT TERMS: when the MS grounds the fuel pump, you are instead sending 12v out to 1C, which back-feeds the fuel pump relay and activates the circuit. you must remove the fuse or you will ruin the circuit.


LAMENT TERMS: When the MS tries to ground the fuel pump relay, you acutally ground the fuel pump relay.
I'm assuming you mean "Laymen's Terms". Either that or you are lamenting the function of the circuit.
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Old 08-02-2010, 05:21 PM   #38
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yeah that.
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Old 08-02-2010, 05:30 PM   #39
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It could also be "Lamer's terms" or something.
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Old 08-02-2010, 05:33 PM   #40
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dumb folk terms:
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