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Below are the ECM Connectors for 2008 vortec 5.3L harness.  Should be similar for 4.8L 6.2L applications. 

BLOCKS HIGHLIGHTED LIKE THIS, ARE WIRES THAT ARE NEEDED, AND GO TO EXTERNAL CONNECTION FOR STAND ALONE I have also highlighted the 6 wires used to connect to the gas pedal.  PAY ATTENTION, for whatever reason, TRUCK and CAMARO have two pins swapped on gas pedal, D and F

BLOCKS HIGHLIGHTED LIKE THIS, ARE WIRES THAT CAN BE REMOVED FROM PCM CONNECTORS, NOT NEEDED. Note: Removing all of these will result in a non-emissions friendly harness.  If requirements are for 4 oxygen sensors, EVAP system, then you will not want to remove those components.

WIRES THAT ARE NOT HIGHLIGHTED REMAIN UN TOUCHED.  THEY WILL GO DIRECTLY FROM ECM TO A PLUG, (SENSOR, SWITCH, DEVICE ETC.)

OEM#:13580788 73-Way Female MX123 34566 Series, Color Black  
         
ECM%20x1%20all%20GAS%20except%20LY6
 
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
These Pinouts are for GAS engines (EXCEPT LY6)  
       
J1 Connector or X1  
       
Pin Wire Circuit Function  
1 0.35 OG/BK 1786 Park/Neutral Signal goes to transmission range switch ground signal
2 0.5 GY/BK 1694 4WD Low Signal (NQG/NP2) some harnesses has a pin plug in ecm connector
3 0.5 TN/WH 1695 Axle Switch Signal (NQG/NP2) some harnesses has a pin plug in ecm connector
4 -- -- Not Used  
5 -- -- Not Used  
6 -- -- Not Used  
7 -- -- Not Used  
8 -- -- Not Used  
9 0.5 L-BU/WH 6311 Brake Switch Signal to underhood fuse block P3, wire also goes to TCM, both hook to tcc brake switch at brake pedal, 12v+ key hot, hot with brakes NOT applied
10 0.5 PU/WH 1668 HO2S High Signal Bank 1 Sensor 2  
11 0.5 TN/WH 1669 HO2S Low Signal Bank 1 Sensor 2  
12 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal (CJ2/C67)  
13 0.35 TN 5514 Low Reference (4.8L/5.3L6.0L/6.2L with CJ2/C67) - A/C Refrigerant Pressure Sensor Pin 1  
14 -- -- Not Used  
15 -- -- Not Used  
16 0.35 PU 1589 Fuel Level Sensor Signal - Primary  
17 D-BU/WT -- High Speed Cooling Fan Relay Control UNDERHOOD B5
18 0.5 D-BU 5985 Accessory Wakeup Serial Data  
19 0.5 PK 439 Ignition 1 Voltage ECM 12v+ KEY HOT UNDERHOOD P5
20 0.5 RD/WH 440 Battery Positive Voltage ECM 12v+ BATT HOT UNDERHOOD D3
21 -- -- Not Used  
22 -- -- Not Used  
23 0.35 PU 1272 Low Reference - APP Sensor Pin A X109 C1
24 0.35 D-GN 890 Fuel Tank Pressure Sensor Signal  
25 -- -- Not Used  
26 -- -- Not Used  
27 0.5 TN/BK 2501 High Speed GMLAN Serial Data Bus (-) GOES TO TCM
28 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus (+) GOES TO TCM
29 0.35 D-BU 1161 APP Sensor 1 Signal - APP Sensor Pin E X109 C4
30 0.35 BN 1271 Low Reference - APP Sensor Pin F X109 C6
31 0.35 TN/BK 6049 Low Reference - Fuel Tank Pressure Sensor Pin A, Fuel Pump Sender Assembly Pin B  
32 0.35 L-BU 1162 APP Sensor 2 Signal - APP Sensor Pin B X109 C2
33 0.35 GY 2709 5-Volt Reference 1 - Fuel Tank Pressure Sensor Pin C  
34 0.35 GY/WH 2700 5-Volt Reference 1 - A/C Refrigerant Pressure Sensor Pin 2  
35 -- -- Not Used  
36 0.35 TN 1274 5-Volt Reference 1 - APP Sensor Pin C X109 C3
37 0.5 TN/BK 472 IAT Sensor Signal - MAF Pin D  
38 0.5 TN 2760 Low Reference - MAF Pin E (for IAT)  
39 -- -- Not Used  
40 -- -- Not Used  
41 0.5 YE 492 MAF Sensor Signal - MAF Pin A  
42 -- -- Not Used  
43 -- -- Not Used  
44 -- -- Not Used  
45 -- -- Not Used  
46 -- -- Not Used  
47 0.5 PK/BK 1339 Ignition 1 Voltage ECM 12v+ KEY HOT UNDERHOOD N1
48 -- -- ADD PIN HERE FOR TACH SIGNAL OUTPUT  
49 0.5 TN 1671 HO2S Low Signal Bank 2 Sensor 2  
50 0.35 D-GN/WH 465 Fuel Pump Relay Control - Primary UNDERHOOD P4
51 0.35 TN 1465 Fuel Pump Relay Control - Secondary empty on 5.3 no pin plug
52 0.5 YE/BK 625 Starter Enable Relay Control UNDERHOOD C5
53 -- -- Not Used  
54 -- -- Not Used  
55 -- -- Not Used  
56 0.35 WH/BK 1164 5-Volt Reference 2 - APP Sensor Pin D X109 C5
57 0.35 YE/BK 1827 VSS Output to ABS System 128k ??? wire goes to plug at end of transmission harness leg, next to rear o2
58 0.5 D-GN 335 Low Speed Cooling Fan Relay Control UNDERHOOD A1
59 0.35 YE 5991 Powertrain Relay Coil Control UNDERHOOD P2 this wire USUALLY power a relay, that inturn powers up all the PNK/BLK wires at the underhood fuse block connector, I just wire all PINK and PNK/BLK wires together to a KEY HOT source
60 -- -- Not Used  
61 0.5 WH 1310 EVAP Canister Vent Solenoid Control  
62 -- -- Not Used  
63 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control (CJ2/C67) UNDERHOOD C3
64 0.5 OG/WH 3223 HO2S Heater Low Control Bank 2 Sensor 2  
65 0.5 GY/WH 3122 HO2S Heater Low Control Bank 1 Sensor 2  
66 -- -- Not Used  
67 -- -- Not Used  
68 0.35 BN/WH 419 MIL Control - "Service Engine Soon" Computer supplies GROUND to turn on light X109 A7
69 0.5 PU 1970 HO2S High Signal Bank 2 Sensor 2  
70 0.35 L-BU 1937 Secondary Fuel Level Sensor Signal  
71 0.35 OG/BK 6399 Replicated TOS Signal (without 31 Series without NQF/NQG/NP2) GOES TO TCM
0.5 PU/WH 821 VSS High Signal - TO SPEED SENSOR ON MANUAL TRANS  
72 0.5 L-GN/BK 822 VSS Low Signal - TO SPEED SENSOR ON MANUAL TRANS  
73 3 BK/WH 451 Ground  
       
         
       
OEM#:13511426 80-Way Female Receptacle 0.64 2.8 Sealed, Color Gray  
ECM%20x2%20except%20LY6,%204
 
       
         
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
These pinouts are for GAS engines (EXCEPT 4.3L v6 and LY6)  
       
J2 Connectoror X2  
       
Pin Wire Circuit Function  
1 -- -- Not Used  
2 0.35 PU/WH 6270 5-Volt Reference 2 - Crankshaft Position Sensor Pin C  
3 0.35 GY 2701 5-Volt Reference 2 - Throttle Body Pin E  
4 -- -- Not Used  
5 0.5 BN 582 TAC Motor Control - 2 - Throttle Body Pin A  
6 0.5 YE 581 TAC Motor Control - 1 - Throttle Body Pin B  
7 -- -- Not Used  
8 0.5 D-GN/WH 428 EVAP Canister Purge Solenoid Control  
9 0.5 GY 5493 Cylinder Shutoff Solenoid Control (3) (except 4.8L)  
10 0.5 D-BU 5491 Cylinder Shutoff Solenoid Control (1) (except 4.8L)  
11 0.5 OG 5494 Cylinder Shutoff Solenoid Control (4) (except 4.8L)  
12 0.5 GY/WH 3113 HO2S Heater Low Control - Bank 1 Sensor 1  
13 0.5 L-GN 3212 HO2S Heater Low Control - Bank 2 Sensor 1  
14 0.5 L-GN/BK 5492 Cylinder Shutoff Solenoid Control (2) (except 4.8L)  
15 -- -- Not Used  
16 0.35 PU 5284 Camshaft Actuator Solenoid Control (6.0L/6.2L) Pin 2  
17 0.5 D-BU/WH 878 Fuel Injector 8 Control  
18 0.5 TN/WH 845 Fuel Injector 5 Control  
19 0.5 YE/BK 846 Fuel Injector 6 Control  
20 0.5 TN 1744 Fuel Injector 1 Control  
21 0.5 YE 410 ECT Sensor Signal - ECT Pin B  
22 0.5 TN 2761 Low Reference - ECT Pin A  
23 -- -- Not Used  
24 -- -- Not Used  
25 -- -- Not Used  
26 0.8 D-BU 496 KS 1 Signal - KS1 Pin A  
27 0.8 GY 1716 KS 1 Signal - KS1 Pin B  
28 -- -- Not Used  
29 0.8 L-BU 1876 KS 2 Signal - KS2 Pin A  
30 0.8 GY 2303 KS 2 Signal - KS2 Pin B  
31 -- -- Not Used  
32 0.5 GY 23 Generator Field Duty Cycle Signal  
33 0.5 BN 1174 Oil Level Switch Signal (Early Production)  
34 0.35 BK 2755 Low Reference - Engine Oil Pressure Sensor Pin 1  
35 0.35 TN 2752 Low Reference - Throttle Body Pin C  
36 -- -- Not Used  
37 0.5 L-GN/BK 1745 Fuel Injector 2 Control  
38 0.5 PK/BK 1746 Fuel Injector 3 Control  
39 0.5 L-BU/BK 844 Fuel Injector 4 Control  
40 0.5 OG/BK 877 Fuel Injector 7 Control  
41 0.35 GY/WH or GY ??? 2705 5-Volt Reference 1 - Engine Oil Pressure Sensor Pin 2  
42 -- -- Not Used  
43 0.35 GY 2704 5-Volt Reference 1 - MAP Sensor Pin C  
44 0.35 D-BU 6259 5-Volt Reference 1 - Camshaft Position Sensor Pin A  
45 -- -- Not Used  
46 -- -- Not Used  
47 -- -- Not Used  
48 -- -- Not Used  
49 -- -- Not Used  
50 0.35 TN/WH 331 Oil Pressure Sensor Signal  
51 -- -- Not Used  
52 0.35 TN 2199 Low Reference (6.0L/6.2L) - Camshaft Position Actuator Sol Valve Pin 1  
53 0.35 OG/BK 469 Low Reference - MAP Sensor Pin A  
54 -- -- Not Used  
55 -- -- Not Used  
56 0.5 TN 1664 HO2S Low Signal - Bank 1 Sensor 1  
57 0.5 PU/WH 1665 HO2S High Signal - Bank 1 Sensor 1  
58 0.35 L-GN 432 MAP Sensor Signal - MAP Sensor Pin B  
59 0.5 PU 1666 HO2S High Signal - Bank 2 Sensor 1  
60 0.5 TN 1667 H02S Low Signal - Bank 2 Sensor 1  
61 0.5 BN 25 Charge Indicator Signal  
62 -- -- Not Used  
63 0.35 PU 486 TP Sensor 2 Signal - Throttle Body Pin F  
64 0.35 D-BU/WH 6265 CMP Sensor Signal - Camshaft Position Sensor Pin C  
65 0.35 D-GN 485 TP Sensor 1 Signal - Throttle Body Pin D  
66 0.35 BN 6266 Low Reference - Camshaft Position Sensor Pin B  
67 -- -- Not Used  
68 0.35 WH/BK 6271 CKP Sensor Signal - Crankshaft Position Sensor Pin A  
69 0.35 GY/BK 6272 Low Reference - Crankshaft Position Sensor Pin B  
70 0.5 PU 2121 IC 1 Control  
71 0.5 PU/WH 2128 IC 8 Control  
72 0.5 OG 2127 IC 7 Control  
73 0.5 OG/WH 2122 IC 2 Control  
74 0.5 L-BU/WH 2126 IC 6 Control  
75 0.5 D-GN 2125 IC 5 Control  
76 0.5 D-GN/WH 2124 IC 4 Control  
77 0.5 L-BU 2123 IC 3 Control  
78 0.5 BN 2129 Low Reference - Coil Connector Pin E Odd Bank  
79 0.5 BN/WH 2130 Low Reference - Coil Connector Pin E Even Bank  
80 -- -- Not Used