Bench test LSx PCM
#1
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Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27
Bench test LSx PCM
I would like to fire up the PCM I have and take a peek with HP Tuners. I have a OBD II connector and a blue PCM connector. Here is what I have so far:
OBD II
Pin Function
2 Serial data
4 GND
5 GND
16 +12V
PCM connector
Pin Wire Col Function
1 BLK PCM GND
2 LT GRN 12V Ref
19 PNK Ign pos voltage
20 ORN Battery pos voltage
40 BLK GND
57 ORN Battery pos voltage
58 DK GRN Class 2 serial data
I'm not sure if I need the 12V ref (pin 2), but if I supply a GND and 12V to the rest, I should be able to communicate to the PCM right?
OBD II
Pin Function
2 Serial data
4 GND
5 GND
16 +12V
PCM connector
Pin Wire Col Function
1 BLK PCM GND
2 LT GRN 12V Ref
19 PNK Ign pos voltage
20 ORN Battery pos voltage
40 BLK GND
57 ORN Battery pos voltage
58 DK GRN Class 2 serial data
I'm not sure if I need the 12V ref (pin 2), but if I supply a GND and 12V to the rest, I should be able to communicate to the PCM right?
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Car: '89 Trans Am GTA
Engine: WAS 350 - now L92 (alum. 378/6.2L)
Transmission: WAS 700R4, now a built T56
Axle/Gears: 3.27 9-bolt
Re: Bench test LSx PCM
THAT'S pretty cool Pocket! (Dare I say FAQ-worthy?)
#5
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Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27
Re: Bench test LSx PCM
Well, It was a success... kinda. When I read the PCM, all I get is garbage. Not sure if this is my box or the PCM.
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#9
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Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27
Re: Bench test LSx PCM
It seems the main difference is my power supply. The other is that my switch to turn the box on, is on the ground side of the circuit... Because of the nifty lit rocker switch I used. I'd be shocked if that was the issue. I wonder if the 12v 3amp power supply I have set up doesn't have enough *****. Ill make an adapter for a the cigarette lighter and a set of alligator clips.
If that doesn't fix it, it can't be the power source.
#10
Re: Bench test LSx PCM
The switch is for IGN power, not to interrupt ground. The battery cable isnt removed each time you shut the car off. I used a $2 switch from advance auto and it is doing fine. The fuse at the start of the circuit keeps everything from being burned up. Uber-**** people can put a relay in, but there relay isnt a need
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Just a WAG, but an 110VAC power supply probably doesn't produce a clean 12VDC.
#12
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Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27
Re: Bench test LSx PCM
My switch position shouldn't matter. When on, everything gets power that is supposed to, which is fed from a fuse.
I just tried the power supply from my Xbox 360. Still a no go, in car with aligator clips is next.
I assume that even if a PCM was locked, I should be able to get further than this.
I just tried the power supply from my Xbox 360. Still a no go, in car with aligator clips is next.
I assume that even if a PCM was locked, I should be able to get further than this.
#13
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Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27
Re: Bench test LSx PCM
*Update*
I posted this on HP Tuners too. It seems I have a blank PCM. This means someone with a Tech 2 or take it to the dealer for a flash.
I posted this on HP Tuners too. It seems I have a blank PCM. This means someone with a Tech 2 or take it to the dealer for a flash.
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