MS build thread
07-28-2010, 05:28 PM
#21
Boost Czar
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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.
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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08-02-2010, 02:55 PM
#32
Boost Czar
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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.
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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08-02-2010, 03:32 PM
#33
Boost Pope
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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.
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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08-02-2010, 03:55 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.
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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08-02-2010, 04:16 PM
#37
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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.
LAMENT TERMS: When the MS tries to ground the fuel pump relay, you acutally ground the fuel pump relay.
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