Im looking to match my EIO to LC1 grounds to resovle some issues. Anyone know where the OBD II ground is at?
Thanks
Dave

 

Are you talking about the diagnostic port? If so, it's pin #4.

 

Signal ground (OBD pin 5) is one of the wires connected to the back of the driver’s side cylinder head. Chassis ground (OBD pin 4) is connected to an IP mounting stud behind the kick panel near the left A-pillar.

 

thanks, im trying to track down an issue w/ mY LC1 and what seems to be a groud offset issue but I dont see how

Dave

 

Use the ground on the EIO connector. The EIO is connected to the ODBII ground.

 

Dave, is your wideband reading a certain value but the AFR being logged into your laptop is .3 or .4afr +/-. I have this issue with my LM-1 and never resolved it.

 

well it jumps quite a bit. I flatlined various voltages and the only voltage that wasnt jumping all over was 5V. When i input a AA battery into the EIO i get a steady 1.601V and the ouput of the LC1 is a steady .49 when i program it to flatline .499V. Im baffled really. Here is a log at .5V and 2.5V

Raw Voltage V
0.615
0.581
0.596
0.518
0.605
0.562
0.547
0.547
0.601
0.537
0.508
0.571
0.532
0.649
0.527
0.527
0.547
0.571
0.586
0.557
0.552
0.566
0.557
0.581
0.542
0.532
0.576
0.552
0.537
0.537
0.557
0.596
0.576
0.513
0.557
0.615
0.552
0.571
0.571
0.576
0.601
0.537
0.527
0.571
0.62
0.557
0.596
0.474
0.581
0.605
0.596
0.522
0.522
0.581
0.576
0.586
0.488
0.596
0.537
0.571
0.552
0.527
0.518
0.532
0.586
0.566
0.552
0.576
0.527
0.61
0.498
0.576
0.581
0.513
0.562
0.571
0.513
0.532
0.542
0.547
0.581
0.591
0.586
0.581
0.586
0.586
0.542
0.527
0.581
0.605
0.591
0.566
0.532
0.571
0.552
0.566
0.518
0.552
0.581
0.581
0.552
0.542
0.542
0.576
0.552
0.547
0.498
0.557
0.508
0.527
0.513
0.557
0.542
0.493
0.483
0.562
0.61
0.562
0.591
0.547
0.552
0.581
0.527
0.605
0.542
0.522
0.513
0.522
0.552
0.532
0.498
0.488
0.571
0.576
0.596
0.522
0.547
0.537
0.522
0.562
0.557
0.537
0.527
0.522
0.552
0.596
0.537
0.566
0.498
0.581
0.566
0.581
0.547
0.537
0.562
0.537
0.566
0.557
0.635
0.591
0.537
0.518
0.601
0.522
0.522
0.527
0.586
0.566
0.552

And here is 2.5V:







Raw Voltage V
2.607
2.627
2.651
2.588
2.661
2.632
2.637
2.607
2.622
2.593
2.598
2.617
2.646
2.607
2.554
2.627
2.568
2.632
2.549
2.578
2.612
2.603
2.598
2.632
2.578
2.578
2.603
2.588
2.583
2.607
2.612
2.651
2.573
2.612
2.617
2.603
2.588
2.603
2.529
2.578
2.622
2.603
2.598
2.598
2.568
2.622
2.603
2.588
2.627
2.607
2.578
2.578
2.607
2.583
2.593
2.632
2.598
2.583
2.617
2.642
2.563
2.593
2.568
2.603
2.607
2.603
2.573
2.573
2.637
2.627
2.598
2.593
2.617
2.559
2.559
2.632
2.534
2.622
2.549
2.559
2.603
2.622
2.573
2.612
2.559
2.607
2.598
2.583
2.603
2.578
2.554
2.563
2.642
2.588
2.603
2.549
2.534
2.617
2.661
2.583
2.568
2.534
2.573
2.642
2.588
2.554
2.563
2.573
2.612
2.612
2.578
2.563
2.588
2.588
2.632
2.549
2.573
2.627
2.588
2.598
2.607
2.578
2.588
2.568
2.593
2.578
2.598
2.568
2.646
2.612
2.627
2.612
2.603
2.593
2.607
2.549
2.559
2.588
2.524
2.603
2.583
2.656
2.627
2.554
2.632
2.588
2.578
2.578
2.578
2.563
2.637
2.568
2.617
2.554
2.603
2.598
2.598
2.539
2.617
2.588
2.554
2.637
2.607
2.637
2.588
2.617
2.573
2.622
2.563
2.554
2.568
2.563
2.563
2.627
2.593
2.593
2.588
2.578
2.578
2.612
2.568
2.622
2.627
2.583
2.646
2.603
2.622
2.563
2.593
2.622
2.573
2.568
2.651
2.573
2.607
2.578
2.534
2.603
2.632
2.598
2.568
2.612
2.578
2.529
2.578
2.603
2.583
2.588
2.568
2.568
2.593
2.593
2.603
2.617
2.598
2.588
2.539
2.607
2.612
2.637
2.563

 

and as far as wiring, i have the green going to EIO ground, blue to battery and the white to a chassis ground per the HPT help manual.

Dave

 

my obd2 scanner doesnt scan my car, but will scan the family focus...
are the serial and chassis grounds both standard grounds or do they serve a function towards an obd2 scanner??? also where does the j1850 wire in the number 2 pin go?