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Old 12-21-2007, 02:05 PM   #1
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Default Ground Pins on DB37 (pcb V3.0)

I don't have my MS V3.0 with me, but I did notice an awful lot of ground pins.

I see a lot more inputs on the MS-II, and want to use those! Can I cut the little ground traces to the pins on the DB-37 (i.e. it's connected on the outer plane only) or are those pins hooked up on an inner layer of the board?

It'd be much more slick to use the original connector instead of cutting a hole for another DB-9 or something. I really want to be able to log EGT's and I'm out of pins.

Thanks!!
-Abe.
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Old 12-21-2007, 02:34 PM   #2
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Even with using all of the SPR outputs you're running out?
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Old 12-21-2007, 03:06 PM   #3
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I've seen some harnesses where people only use 3-4 of the 20000 ground pins.

you filled all the spare and iac outputs?
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Old 12-21-2007, 04:08 PM   #4
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Er, well.... I'd forgotten I hadn't used SPR1 and SPR2, but I have used everything else.

Spare 1/2 are CANH and CANL, and if I'm already tight on inputs before even running the car, I have a feeling I'll be in the reals of a GPIO board soon - and I don't want to tie up those lines just yet.

Then again, if I WERE to run another connector, doing it for GPIO would be how I want to do it.

Then again - it just seems dumb to have 14 pins of a 37 pin connector wasted. If 30 seconds with a razor blade gives the V3.0 board as many i/o pins on the connector as there are on the CPU (dumb not to), I'm in.
-Abe.
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Old 12-21-2007, 04:20 PM   #5
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i mean, i only use 2-7-8-9-17-18-19 as grounds...the rest ARE wasted, however, i don't need them....you only get to the point where the cover to your db37 connector is hard to screw shut because of so many darned wires
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Old 12-21-2007, 04:35 PM   #6
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I don't have a cover on my DB37....

-Mike
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Old 12-21-2007, 04:40 PM   #7
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Quote:
Originally Posted by Braineack View Post
I've seen some harnesses where people only use 3-4 of the 20000 ground pins.

you filled all the spare and iac outputs?
that'll be me :(

which pins are grounds on the DB37*. my job over Xmas is to sort some grounds out.......

*Yes I'm being lazy and not searching
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Old 12-21-2007, 05:57 PM   #8
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1-2 7-8-9-10-12-13-14-15-16-17-18-19
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Old 12-21-2007, 06:28 PM   #9
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Quote:
Originally Posted by Braineack View Post
1-2 7-8-9-10-12-13-14-15-16-17-18-19
fooking hell how many!

cheers Braineack
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Old 12-21-2007, 07:05 PM   #10
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1 GND
2 GND
3 SPR1
4 SPR2
5 SPR3
6 SPR4
7 GND
8 GND
9 GND
10 GND
11 GND
12 GND
13 GND
14 GND
15 GND
16 GND
17 GND
18 GND
19 GND
20 MAT
21 CLT
22 TPS
23 O2
24 TachIn
25 IAC1A
26 Vref
27 IAC1B
28 12 RAW
29 IAC2A
30 IDL
31 IAC2B
32 INJ-1
33 INJ-1
34 INJ-2
35 INJ-2
36 IGN
37 FP1


For that matter:
1 GND GND GND Both
2 GND GND GND Both
3 SPR1 Spare 1 CANbus High (unused)
4 SPR2 Spare 2 CanBus Low (unused)
5 SPR3 Spare 3 KnockSenseMS In
6 SPR4 Spare 4 Boost Control Solenoid PMW Out
7 GND GND GND Both
8 GND GND GND Both
9 GND GND GND Both
10 GND GND GND Both
11 GND GND GND Both
12 GND GND GND Both
13 GND GND GND Both
14 GND GND GND Both
15 GND GND GND Both
16 GND GND GND Both
17 GND GND GND Both
18 GND GND GND Both
19 GND GND GND Both
20 MAT Manifold Absolute Temperature GM AIT MS
21 CLT Coolant Temp Sensor OEM CLT ?
22 TPS Throttle Position Sensor OEM TPS ?
23 O2 WideBand O2 Sensors LC-1 MS
24 TachIn Timing Signal In Crank Position Trigger In ?
25 IAC1A Idle Air Control Coil 1 A Camshaft Position Trigger In
26 Vref Sensor Voltage Reference Output V_ref for TPS, ??? MS, AIT?
27 IAC1B Idle Air Control Coil 1 B VICS Out
28 12 RAW Switched Power, 12V Switched Power, 12V In
29 IAC2A Idle Air Control Coil 2 A Fan Control Out
30 IDL Fast Idle/PWM valve PWM idle Valve (add diode!) Out
31 IAC2B Idle Air Control Coil 2 B Ignition 2 & 3 Out
32 INJ-1 Fuel Injector Channel 1 Out Injector 1 & 4 Out
33 INJ-1 Fuel Injector Channel 1 Out Injector 1 & 4 Out
34 INJ-2 Fuel Injector Channel 2 Out Injector 2 & 3 Out
35 INJ-2 Fuel Injector Channel 2 Out Injector 2 & 3 Out
36 IGN Ignition A Out Ignition 1 & 4 Out
37 FP1 Fuel Pump Relay Out Fuel Pump Relay


I'm going to post an excel version soon. Not done yet. I'm still deciding what to let the OEM ECU see. Right now I think it's alternator and AIT.

Really, you can buy an alt controller for $12. So I might do that. SOON the evil mazdaness will leave my car.
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