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These schematics are specifically for 96 5.7 L truck, however notice that there is sometimes a ( ) with a number inside.  This means there is a note about this wire, scroll down to bottom of that connector to see the note.  Example, Pin 5 of BLUE connector has (1) and (2) on the Function line.  This means this pin serves different function depending on what the note says.  In this case, (1) means 4.3L engines ONLY, (2) means all EXCEPT 4.3L engine.

1996-97 Vortec 5.7L under 8600 GVW

Engine Controls Connector End Views - PCM C1, C2, C3, C4

 
Connector Part Information
bullet12129025
bulletBlue C1 32 Pin Connector
Pin Wire Color Circuit No. Function Component Connector Cavity DTC(s) Affected Possible Symptoms From a Faulty Circuit
1 -- -- Not Used -- -- --
2 -- -- Not Used -- -- --
3 BRN/WHT 633 1X CMP Signal -- -- --
4 PNK 539 Ignition Feed -- -- No Change
5 YEL/BLK DK BLU/WHT 846 878 Injector # 6 Control (1) Injector #8 Control (2) -- -- Rough Idle
6 -- -- Not Used -- -- --
7 TAN 1667 H02S Low Bank 2 Sensor 1 -- -- Fixed H02S Reading
8 PNK/BLK 632 CMP Low -- -- --
9 -- -- Not Used -- -- --
10 TAN/BLK 422 TCC Solenoid Control (7) -- -- No TCC
11 -- -- Not Used -- -- --
12 DK GRN/ WHT 428 EVAP Purge Solenoid Control -- -- Purge Inop.
13 WHT 687 3-2 Control Solenoid (5) -- -- Incorrect Gear State
14 BRN 436 AIR Relay Control (3) -- -- --
15 WHT 696 VSS Output Signal (Antilock) -- -- --
16 -- -- Not Used -- -- --
17 -- -- Not Used -- -- --
18 GRY 435 EGR Control -- -- EGR Inop.
19 PPL/WHT 1665 H02S High Bank 1 Sensor 1 -- -- --
20 PPL 1670 H02S High Bank 1 Sensor 2 -- -- --
21 PPL 1666 H02S High Bank 2 Sensor 1 -- -- --
22 PPL/WHT 1668 H02S Bank 1 Sensor 3 (4) H02S High Bank 2 Sensor 2 (9) -- -- Poor Performance
23 -- -- Not Used -- -- --
24 TAN 1671 H02S Low Bank 1 Sensor 2 -- -- Fixed H02S Reading
25 TAN/WHT 1653 H02S Low Bank 2 Sensor 2 (9) H02S Low Bank 1 Sensor 1     Fixed H02S Reading
26 TAN/WHT 1669 H02S Low Bank 1 Sensor 3 (4) H02S Low Bank 2 Sensor 2 (9) -- -- Fixed H02S Reading
27 -- -- Not Used -- -- --
28 PPL 574 CKP Low -- -- No Start
29 LT.GRN/BLK 822 VSS Low -- -- --
30 PPL/WHT 821 VSS Signal -- -- --
31 YEL 573 3X CKP Signal (1) 4X CKP Signal (2) -- -- No Start
32 -- -- Not Used -- -- --
(1) 4.3L Only

(2) Except 4.3L

(3) 7.4L California Emissions Only

(4) 4.3L and 5.0L Only

(5) Automatic Transmissions Only

(6) Manual Transmissions Only

(7) 4L60E Automatic Transmissions Only

(8) 4L80E Automatic Transmissions Only

(9) 5.7L and 7.4L Only

 
Connector Part Information
bullet12129025
bulletRed C2 32 Pin Connector
Pin Wire Color Circuit No. Function Component Connector Cavity DTC(s) Affected Possible Symptoms From a Faulty Circuit
1 -- -- Not Used -- -- --
2 -- -- Not Used -- -- --
3 BLK 1744 Injector # 1 Control -- -- Rough Idle
4 YEL/BLK 1223 2-3 Shift Solenoid Control (5) -- -- Incorrect Gear State
5 -- -- Not Used -- -- --
6 LT/GRN 1222 1-2 Shift Solenoid Control (5) -- -- Incorrect Gear State
7 BRN 418 PWM TCC Solenoid Control (6) -- -- TCC Inop.
8 -- -- Not Used -- -- --
9 DK GRN/WHT 459 A/C Relay Enable Relay Control -- -- A/C Inop.
10 BRN 1456 EGR Pintle Position -- -- EGR Inop.
11 LT GRN/BLK 1745 Injector #2 Control (2) -- -- Rough Idle
12 RED/BLK 877 Injector #7 Control -- -- Rough Idle
13 LT GRN/WHT 1749 IAC B High -- -- --
14 LT BLU/WHT 1747 IAC A High -- -- --
15 LT GRN/BLK

BLK/WHT

1745

845

Injector #2 Control (1)

Injector # 5 Control (2)

-- -- Rough Idle
16 PNK/BLK

YEL/BLK

1746

846

Injector #3 Control (1)

Injector #6 Control (2)

-- -- Rough Idle
17 -- -- Not Used -- -- --
18 -- -- Not Used -- -- --
19 DK/BLU 496 KS Signal -- -- Knock Retard
20 -- -- Not Used -- -- --
21 LT/GRN 432 MAP Signal -- -- Poor Performance
22 TAN 472 IAT Signal -- -- Poor Performance
23 YEL 410 ECT Signal -- -- Poor Performance
24 DK/BLU 417 TP Signal -- -- Poor Performance/ Harsh Shifts
25 -- -- Not Used -- -- --
26 -- -- Not Used -- -- --
27 YEL/BLK 1227 TFT Signal (5) -- -- Early TCC
28 YEL 492 MAF Signal -- -- --
30 LT BLU/BLK 1748 IAC A Low -- --
31 BLK/WHT

LT BLU/BLK

845

844

Injector #5 Control

Injector #4 Control (2)

-- -- Rough Idle
32 LT BLU/BLK

PNK/BLK

844

1846

Injector #5 Control (1)

Injector #3 Control (2)

-- -- Rough Idle
(1) 4.3L Only

(2) Except 4.3L

(3) 7.4L California Emissions Only

(4) 4.3L and 5.0L Only

(5) Automatic Transmission Only

(6) Manual Transmissions Only

(7) 4L60E Automatic Transmissions Only

(8) 4L80E Automatic Transmissions Only

(9) 5.7L and 7.4L Only

 
Connector Part Information
bullet12129025
bulletGray C3 32 Pin Connector
Pin Wire Color Circuit No. Function Component Connector Cavity DTC(s) Affected Possible Symptoms From a Faulty Circuit
1 -- -- Not Used -- -- --
2 -- -- Not Used -- -- --
3 -- -- Not Used -- -- --
4 BLK 452 ECT/TP Sensor Ground -- -- High Idle
5 -- -- Not Used -- -- --
6 RED/BLK 1228 PCS High -- -- Poor Shift Quality
7 DK BLU/WHT 1231 Input Speed Sensor Low (8) -- -- --
8 RED/BLK 1230 Input Speed Sensor High -- -- --
9 WHT 423 IC Control -- -- No Start
10 -- -- Not Used -- -- --
11 RED 1226 Range Signal C (5) -- -- Erratic Manual Downshifts
12 GRY 416 TP Sensor 5V Reference -- -- Lack Of Power, Harsh Shifts
13 BRN/WHT 379 Clutch Signal (6) -- -- AIR Pump Inop.
14 -- -- Not Used -- -- --
15 BRN 1982 EVAP Canister Purge Diagnostic Vacuum Switch Signal -- -- Purge Inop.
16 LT BLU/WHT 1229 PCS Low (5) -- -- Poor Shift Quality
17 BLK/WHT 451 System Ground -- -- --
18 BLK/WHT BLK/WHT Ground -- -- --
19 BLK 470 IAT/MAP/EGR Sensor Ground -- -- Idle Surge, Exhaust Odor
20 -- -- Not Used -- -- --
21 ORN 440 Battery Feed -- -- --
22 DK/BLU 1225 Range Signal B -- -- Erratic Manual Downshifts
23 PNK 1224 Range Signal A -- -- Erratic Manual Downshifts
24 -- -- Not Used -- -- --
25 DK GRN/WHT 762 A/C Request Signal -- -- --
26 -- -- Not Used -- -- --
27 GRY 474 EGR/MAP 5V Reference -- -- --
28 -- -- -- -- -- --
29 -- -- -- -- -- --
30 -- -- -- -- -- --
31 -- -- -- -- -- --
32 -- -- -- -- -- --
(1) 4.3L Only

(2) Except 4.3L

(3) 7.4L California Emissions Only

(4) 4.3L and 5.0L Only

(5) Automatic Transmissions Only

(6) Manual Transmissions Only

(7) 4L60E Automatic Transmissions Only

(8) 4L80E Automatic Transmissions Only

(9) 5.7L and 7.4L Only

 
Connector Part Information
bullet12129225
bulletBlack C4 24-pin Connector
Pin Wire Color Circuit No. Function Component Connector Cavity DTC(s) Affected Possible Symptoms From a Faulty Circuit
1 DK GRN/WHT 465 Fuel Pump Relay Control -- -- Extended Crank When Cold
2 -- -- Not Used -- -- --
3 DK GRN/WHT 817 VSS Output Signal (TCCM, Radio, Cruise) -- -- --
4 DK GRN 389 VSS Output Signal (speedo) -- -- Speedometer Inop.
5 BRN/WHT 419 MIL Control -- -- MIL Inop. or Remains ON
6 -- -- ADD PIN FOR FAN RELAY CONTROL (1997 ONLY) -- -- --
7 -- -- Not Used -- -- --
8 -- -- Not Used -- -- --
9 -- -- Not Used -- -- --
10 PPL 420 Brake Signal -- -- No TCC
11 PPL 1807 Serial Data -- -- No Serial Data
12 -- -- Not Used -- -- --
13 BRN 441 Ignition Feed -- -- --
14 -- -- Not Used -- -- --
15 TAN/BLK 456 Shift Control Lamp -- -- Shift Lamp Inop.
16 -- -- Not Used -- -- --
17 -- -- Not Used -- -- --
18 PNK 439 Ignition Feed -- -- No Start
19 BLK/WHT 1695 4WD Engaged Signal (5) -- -- --
20 -- -- Not Used -- -- --
21 -- -- Not Used -- -- --
22 -- -- Not Used -- -- --
23 GR/BLK 1694 Transfer Case Hi Low Switch -- -- --
24 LT BLU/BLK 396 Cruise Engaged Signal -- -- No Change
(5) Automatic Transmissions Only

 

 

!!!!!!!!!!!!!!!!!!!THESE SCHEMATICS ARE V8 ONLY!!!!!!!!!!!!!!!

A/C

CLUSTER, IP, DLC

CMP, CKP, ICM, COIL

INJECTORS

FUEL PUMP

HO2S

IAC

MAF, EVAP, EGR

MAP, IAT, TP, ECT

PC SOL, TFP

VSS