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These are the RED & BLUE PCM connector pinouts that will cover 1999 to 2002 4.8/5.3/6.0. Your harness MAY NOT have a pin in a location I have listed having a wire.  I have tried to list all possible wires that will show up 99-02.  If I show a wire, and your harness does not have it, you probably don't need it anyway. SOME LOCATIONS HAVE MULTIPLE POSSIBILITIES DEPENDING ON WHERE VEHICLE WAS BUILT, MOSTLY DEALING WITH O2 SENSORS.  EACH POSSIBILITY WILL HAVE ITS OWN LINE. For more info about the o2 sensor differences click here. 

BLOCKS HIGHLIGHTED LIKE THIS, ARE WIRES THAT ARE NEEDED, AND GO TO EXTERNAL CONNECTION FOR STAND ALONE

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.

I have been asked to identify the wires for electronic auto trans controls that can be removed if you are not going to use electronic automatic transmission.  Here they are, the Pin# will be highlighted in RED. If removing trans, pay attention to BLUE connector pin 41.  Some harnesses are different based on type of o2 sensors you have.  Some this pin goes to trans only, some harnesses, there is a splice, and this pin goes to coolant temp sensor AND transmission.  Simply cut the wire to the trans AT THE splice if this is the case.

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

 

Truck 1999 5.3L Connector C1 BLUE
Pin Wire Color Circuit No. Function
1 BLK/WHT 451 PCM Ground
2 LT GRN 1867 Crankshaft Position Sensor B+ Supply
3 PNK/BLK 1746 Injector 3 Control
4 LT GRN/BLK 1745 Injector 2 Control
5 -- -- Not Used
6 -- -- Not Used
7 -- -- Not Used
8 -- -- Not Used
9 -- -- Not Used
10 -- -- Not Used
11 LT BLU 1876 Knock Sensor Signal Rear
12 DK BLU/WHT 1869 Crankshaft Position Sensor Signal
13 ORN/BLK 463 Requested Torque Signal (NW7)
14 ORN/BLK 1061 UART Serial Data (drive by wire only)
15 DK BLU/WHT 774 UART Serial Data (drive by wire only)
16 -- -- Not Used
17 DK BLU 1225 Transmission Fluid Pressure Switch B
18 RED 1226 Transmission Fluid Pressure Switch C
19 PNK 439 PCM Ignition Supply
20 ORN 440 PCM Battery Supply
21 YEL/BLK 1868 Crankshaft Position Sensor Ground
22 -- -- Not Used
23 PPL 719 Sensor Ground EGR
24 -- -- Not Used
25 TAN 1671 HO2S Signal Low B2S2 (w/Case Ground O2 Sensors)
25 TAN 413 HO2S Signal Low B2S2 (w/Isolated Ground O2 Sensors)
26 TAN 1667 HO2S Signal Low B2S1 (w/Case Ground O2 Sensors)
26 TAN 413 HO2S Signal Low B2S1 (w/Isolated Ground O2 Sensors)
27 -- -- Not Used
28 TAN/WHT 1669 HO2S Signal Low B1S2 (w/Case Ground O2 Sensors)
28 TAN 413 HO2S Signal Low B1S2 (w/Isolated Ground O2 Sensors)
29 TAN/WHT 1653 HO2S Signal Low B1S1 (w/Case Ground O2 Sensors)
29 TAN 413 HO2S Signal Low B1S1 (w/Isolated Ground O2 Sensors)
30 LT GRN 1478 Engine Coolant Level Switch
31 -- -- Not Used
32 BLK/WHT 771 PRND A Input
33 PPL 420 TCC Brake Switch
34 WHT 776 PRND P Input - PCM can be programmed to accept a SINGLE WIRE park/neutral signal on this PIN, if no trans mounted range sensor is present
35 GRA 48 Clutch Switch Signal (manual trans)
36 BLK 1744 Injector 1 Control
37 YEL/BLK 846 Injector 6 Control
38 PNK/WHT 1101 Damping Lift/Drive Signal
39 -- -- Not Used
40 BLK/WHT 451 PCM Ground
41 BLK 407 Sensor Ground (Trans) w/Case grounded o2 Sensors
41 GRY 720 Sensor Ground (Trans, ETC) w/Isolated Ground O2 Sensors
42 -- -- Not Used - ADD PIN HERE FOR FAN 1 RELAY CONTROL
43 RED/BLK 877 Injector 7 Control
44 LT BLU/BLK 844 Injector 4 Control
45 GRA 474 Fuel Tank Pressure Sensor 5V Reference
46 GRA 416 TP Sensor 5V Reference
47 GRA 597 MAP Sensor 5V Reference
48 GRA 596 EGR Pintle Position Sensor 5V Reference
49-50 -- -- Not Used
51 DK BLU 496 Knock Sensor Signal Front
52 -- -- Not Used
53 BLK 470 Fuel Tank Pressure Sensor Ground
54 BLK 452 TP Sensor Ground
55 BRN 1456 EGR Pintle Position Sensor Signal
56 -- -- Not Used
57 ORN 440 PCM Battery Supply
58 DK GRN 1049 Serial Data to OBD2 Port
59 YEL 710 Serial Data to BCM
60 ORN/BLK 469 MAP Sensor Ground
61 PNK/BLK 632 CMP Sensor Ground
62 -- -- Not Used
63 GRY 720 Sensor Ground (ETC) w/case grounded o2 sensors
63 TAN 413 Sensor Ground (HO2S Low Signal) w/isolated grounded o2 sensors
64 -- -- Not Used
65 PPL 1670 HO2S Signal High Bank 2 Sensor 2
66 PPL 1666 HO2S Signal High Bank 2 Sensor 1
67 -- -- Not Used
68 PPL/WHT 1668 HO2S Signal High Bank 1 Sensor 2
69 PPL/WHT 1665 HO2S Signal High Bank 1 Sensor 1
70 BRN 1174 Low Oil Level Switch
71 -- -- Not Used - ADD PIN HERE FOR TOW/HAUL MODE SWITCH INPUT (programming required to make function)
72 YEL 772 PRND B Input
73 BRN/WHT 633 Camshaft Position (CMP) Sensor Signal
74 YEL 410 Engine Coolant Temperature (ECT) Sensor Signal
75 PNK 1020 PCM Ignition Supply
76 BLK/WHT 845 Injector 5 Control
77 DK BLU/WHT 878 Injector 8 Control
78 -- -- Not Used
79 WHT 687 3-2 Shift Solenoid Control
80 ORN/BLK 510 Fuel Level Sensor Ground
       
Truck 1999 5.3L Connector C2 RED
Pin Wire Color Circuit No. Function
1 BLK/WHT 451 PCM Ground
2 BRN 418 TCC Control Solenoid
3 TAN 1465 Fuel Pump Relay Control - Secondary
4 -- -- Not Used
5 TAN/BLK 464 Deliverd Torque Signal
6 RED/BLK 1228 Transmission Fluid Pressure Control Solenoid High
7 RED 1676 EGR Solenoid Supply
8 LT BLU/WHT 1229 Transmission Fluid Pressure Control Solenoid Low
9 DK GRN/WHT 465 Fuel Pump Relay Control
10 WHT 121 Engine Speed (Tach) Output Signal
11 DK BLU 604 A/C High Pressure Recirculation Switch
12 -- -- Not Used
13 LT BLU/BLK 396 Cruise Control Engage Signal
14 -- -- Not Used
15 BRN 25 Generator L Terminal (Alternator turn on signal)
16 GRA/BLK 1694 4 Wheel Drive Switch Signal Low (KEEP IF USING STOCK TRANSFER CASE IN A 4WD APPLACTION, WITH VSS ON OUTPUT OF TRANSFER CASE.
17 DK GRN/WHT 762 A/C Request Signal
18 -- -- Not Used
19 BLK/WHT 1695 4 Wheel Drive Front Axle Switch
20 LT GRN/BLK 822 Vehicle Speed Sensor (VSS) Reference Low
21 PPL/WHT 821 Vehicle Speed Sensor (VSS) Signal
22 RED/BLK 1230 Vehicle Speed Sensor (VSS) Signal (4L80E Only)
23 DK BLU/WHT 1231 Vehicle Speed Sensor (VSS) Reference Low (4L80E Only)
24 DK BLU 417 TP Sensor Signal
25 TAN 472 IAT Sensor Signal
26 PPL 2121 Ignition Control 1
27 RED 2127 Ignition Control 7
28 LT BLU/WHT 2126 Ignition Control 6
29 DK GRN/WHT 2124 Ignition Control 4
30 -- -- Not Used
31 YEL 492 MAF Sensor Signal
32 LT GRN 432 MAP Sensor Signal
33 DK GRN 1614 HVAC Recirculation Door Control (KEEP PIN HERE FOR FAN 2 RELAY CONTROL)
34 DK GRN/WHT 428 EVAP Canister Purge Solenoid Control
35 -- -- Not Used
36 BRN 436 AIR Pump Relay Control (w/NC1)
37 -- -- Not Used
38 -- -- Not Used - ADD PIN FOR PWM FUEL GAUGE SIGNAL OUTPUT (used to run factory fuel level gauge in 96-99 trucks)
39 RED 631 CMP Sensor B+ Supply
40 BLK/WHT 451 PCM Ground
41 WHT 257 EGR Solenoid Ground
42 TAN/BLK 422 TCC Enable Circuit (4L60-E only)
43 DK GRN/WHT 459 A/C Clutch Relay Control
44 -- -- Not Used
45 WHT 1310 EVAP Canister Vent Valve Control
46 BRN/WHT 419 Malfunction Indicator Lamp (MIL) Control
47 YEL/BLK 1223 Transmission Shift Solenoid B
48 LT GRN 1222 Transmission Shift Solenoid A
49 YEL/BLK 1827 Vehicle Speed Output Circuit 128K
50 DK GRN/WHT 817 Vehicle Speed Output Circuit 4K
51 YEL/BLK 1227 Transmission Temperature Sensor Signal
52 GRY 23 Generator Field Duty Cycle Signal
53 -- -- Not Used
54 PPL 1589 Fuel Level Sensor Signal
55 DK GRN 603 A/C Low Pressure  Switch Signal
56 -- -- Not Used
57 BLK 552 IAT Sensor Ground
58 -- -- Not Used
59 -- -- Not Used
60 BRN 2129 Ignition Control Reference Low Bank 1
61 BRN/WHT 2130 Ignition Control Reference Low Bank 2
62 GRA 773 PRND C
63 PNK 1224 Transmission Fluid Pressure Switch A
64 DK GRN 890 Fuel Tank Pressure Sensor Signal
65 -- -- Not Used
66 PPL/WHT 2128 Ignition Control 8
67 RED/WHT 2122 Ignition Control 2
68 DK GRN 2125 Ignition Control 5
69 LT BLU 2123 Ignition Control 3
70 -- -- Not Used
71 -- -- Not Used -
72 -- -- Not Used
73 DK BLU 1936 Fuel Level Sensor Signal - Secondary
74 LT GRN/WHT 3213 HO2S Heater Control (w/isolated grounded sensors) (2001-02 6.0L Only)
75 -- -- Not Used
76 LT GRN/WHT 1749 IAC Coil B High
77 LT GRN/BLK 444 IAC Coil B Low
78 LT BLU/BLK 1748 IAC Coil A Low
79 LT BLU/WHT 1747 IAC Coil A High
80 LT GRN 3212 HO2S Heater Low Reference (w/isolated grounded sensors (2001-02 6.0L Only)