Month: June 2018

Ohm’s Law | LS Wiring — Move @ The Speed of Light 💡

Ohm’s Law – Everything In Life Relates To Pressure.

  • P=Watts – The rate of energy conversion
  • R=Ohms – The electrical resistance
  • I=Amps – The amount of electricity passing through a / any point
  • E=Volts – The potential electrical difference between point (A) and point (B)
I also found this humorous but very good visual explanation of Ohms law here
simple-ohms-law.jpg

Resistance Tables.

American Wire Gages (AWG) Sizes and Resistances

 

AWG wire
size (solid)

Area
CM*

Resistance per
1000 ft (ohms) @ 20 C

Diameter
(inches)

Maximum current**
(amperes)

0000

211600

0.049

0.46

380

000

167810

0.0618

0.40965

328

00

133080

0.078

0.3648

283

0

105530

0.0983

0.32485

245

1

83694

0.124

0.2893

211

2

66373

0.1563

0.25763

181

3

52634

0.197

0.22942

158

4

41742

0.2485

0.20431

135

5

33102

0.3133

0.18194

118

6

26250

0.3951

0.16202

101

7

20816

0.4982

0.14428

89

8

16509

0.6282

0.12849

73

9

13094

0.7921

0.11443

64

10

10381

0.9989

0.10189

55

11

8234

1.26

0.09074

47

12

6529

1.588

0.0808

41

13

5178.4

2.003

0.07196

35

14

4106.8

2.525

0.06408

32

15

3256.7

3.184

0.05707

28

16

2582.9

4.016

0.05082

22

17

2048.2

5.064

0.04526

19

18

1624.3

6.385

0.0403

16

19

1288.1

8.051

0.03589

14

20

1021.5

10.15

0.03196

11

21

810.1

12.8

0.02846

9

22

642.4

16.14

0.02535

7

23

509.45

20.36

0.02257

4.7

24

404.01

25.67

0.0201

3.5

25

320.4

32.37

0.0179

2.7

26

254.1

40.81

0.01594

2.2

27

201.5

51.47

0.0142

1.7

28

159.79

64.9

0.01264

1.4

29

126.72

81.83

0.01126

1.2

30

100.5

103.2

0.01002

0.86

31

79.7

130.1

0.00893

0.7

32

63.21

164.1

0.00795

0.53

33

50.13

206.9

0.00708

0.43

34

39.75

260.9

0.0063

0.33

35

31.52

329

0.00561

0.27

36

25

414.8

0.005

0.21

37

19.83

523.1

0.00445

0.17

38

15.72

659.6

0.00396

0.13

39

12.47

831.8

0.00353

0.11

40

9.89

1049

0.00314

0.09

 

The U.S. wire gauges (called AWG gauges) refer to sizes of copper wire. This table corresponds to a resistivity of

for copper at 20 C

*The AWG system states areas of round copper wires in “circular mils”, which is the square of the diameter in mils. 1 mil =.001 inch.

This data from Floyd, Electric Circuit Fundamentals, 2nd Ed.

**Maximum current for chassis wiring. Data from Handbook of Electronic Tables and Formulas for American Wire Gauge. The maximum current for power transmission is less.

 

Index Tables

Reference Floyd

 

TPI Speed Density GM ECM

The TPI Speed Density 5.0L | 5.7L

The essentials to run a 7730 speed density tuned port injection system starting with the (A) cavity. A4 is a gray 5v reference for Manifold Absolute Pressure (MAP), A5 is 5-volt reference for TPS sensor, A6 is ignition power, A8 is serial data to the DLC connector. A11 dark green white to fuel pump drive. A12 goes to chassis ground / side of block or frame.

(B) cavity starting with b one is battery power, B5 and B6 are TPS and CTS sensor ground cavities – through B11 should be used accordingly depending on your install.

(C) cavity starting with C7 is the town black bypass going to distributor, EST white wire C9 A\C request, C11 and C12 are injector drivers, C16 is battery power.

(D) cavity starting with d 1 to ground, D6 and D7 also go to ground, D8 and D9 go to the distributor. D12 to Fan request, D14 – 4th gear switch and the 16 park / neutral. Cavity (E) is typically the green connector.

(E) The cavities E3 through E6 are for idle air control valve also known as IACV. E7 goes to check engine light ground, E12 is diagnostic test going to diagnostic link connector (DLC). E-13 fuel pump signal Grey, e14 oxygen sensor signal purple, E15 ground for oxygen sensor at computer. And E16 CTS sensor signal for the coolant temperature sensor.

The (F) cavity terminal F6 TCC control for 700 R4 transmission, F9 goes to ESC knock sensor signal / dark blue, F 13 is TPS signal, dark blue / throttle position sensor (TPS), S15 light green / manifold absolute pressure sensor (MAP) , F16 manifold air temperature also known as MAT.

 

TBI Wire Harness | ECM Pin-out Schematic

GM Schematics All Rights Reserved

The essentials to run a 01227747 ECM will be listed below. Starting at the A Cavity of the GM TBI ECM: A1 is the fuel pump relay and the battery voltage trigger that activates a relay. A5 will be used to control your Service Engine Soon light (SES/ MIL). A6 is ignition power and needs to be placed to the ignition switch, A8 goes to serial data. Along with A9 – which is diagnostic test which will be accompanied on the diagnostic link connector. A11 is the “sensor” ground wire, that is shared with the Coolant Temperature Sensor (CTS) and the Throttle Position Sensor (TPS). A12 goes to ground AKA the engine block or cold hard steel.

CTS Sensor

TPS SENSOR GM TBI | THROTTLE BODY INJECTION

TPS Sensor O.S.

Moving to the B connector 12 cavities and total. B1 goes to battery voltage, B2 goes to fuel pump signal B3 goes to EST reference – which is right on the distributor, B5 EST reference High – purple white in color, also goes to the distributor. B7 is ESC signal black, B10 is a park neutral switch wire, which can be grounded.

EST / HEI Distributor Small

Moving to the C and D connector 16 cavities on top, 16 cavities on bottom 32 cavities total. C3 through C6 go to the idle air control valve, C9 requires crank voltage from starter, C10 is the coolant temperature sensor signal yellow, C11 is Manifold Absolute Pressure Sensor or just (MAP) signal C13 is Throttle Position Sensor signal dark blue in color and C16 is 12 volts battery power.

MAP Sensor GM TBI | Speed Scene Wiring

MAP Sensor

Moving on to the (D) section of this connector. D1 is ground to motor, D2 is MAP sensor ground – purple in color, D4 is EST control light going to distributor, EST bypass is D5 and that is tan/black and color, oxygen sensor ground, which is the same as chassis ground. D7 is the oxygen sensor signal – going directly to the sensor, D14 is injector driver green, D16 injector driver dark – blue and color.

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