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Visit my Facebook page for a lot of New Pictures & Harness Guides  - E-Mail: brendan@lt1swap.com

For detailed information on modifying your F-Body LT1 wiring harness, please see this page on my Facebook page.

1994 LT1 F-Body Harness Rework Detailed Instructions - Facebook photo album containing step by step pictures with details.

 

These schematics are specifically for 1994 Camaro, Firebird 5.7L LT1.  however, will be very similar to 1995.

shell over wires opens, allowing access to pin cavity.

label wires needed for external connection. Here two 12v+ key power feeds are labeled.

I relocate passanger side o2, knock, and eng ground wires to allow more length to locate pcm.

this requires adding length to the tan/purple o2 sensor wires, as well as knock sensor, and I move engine ground to back of head, does not need longer

sort wires for fuse block, and for other connections, diag port, check engine light, brake sw, etc.

fuse block added to harness.

 

 

 

 

PCM Connector Pinouts are specifically for 1997 LT1 5.7L Camaro/Firebird, however, 94-97 all share almost the same pinout. 96-97 will have additional wiring for OBD2 stuff, like rear oxygen sensors, crank shaft position sensor, evap vacuum switch.

Engine Controls Connector End Views

Connector C1 32 Pin Connector (Red) (1) Open Circuit (2) Grounded Circuit (3) Open/Grounded Circuit (4) Shorted to Voltage (*) Refer to Electrical Diagnosis
Pin Wire Color Circuit No. Function Component Connector Cavity DTC(s) Affected Possible Symptoms From a Faulty Circuit
1 Lt Blu/Blk 647 Crankshaft Position Sensor Signal CKP C P0335, P0336 Misfire diagnostic inoperative
2 Blk/Wht 451 PCM Ground Engine Ground *   Engine cranks but will not start.
3 Blk 1744 Injector #1 Control Injector #1 A P0200 (3) P1222 Rough idle, Engine miss
4 Lt Blu/Blk 844 Injector #4 Control Injector #4 A P0200 (3) P1222 Rough idle, Engine miss
5 Yel/Blk 846 Injector #6 Control Injector #6 A P0200 (3) P1222 Rough idle, Engine miss
6 Red/Blk 877 Injector #7 Control Injector #7 A P0200 (3) P1222 Rough idle, Engine miss
7 Dk Grn/Wht 465 FP Relay Control FP Relay B2   Long Crank Time Before Engine Starts
8           Not Used
9 Lt Blu 697 EGR Vacuum Control signal solenoid valve EGR Solenoid B P0400 P0403 (3) Detonation, Stall, Rough Idle, And Poor Performance
10 Dk Blu 473 Cooling fan relay #2 and #3 control Fan Relays 86 P1642 (3) Inoperative Cooling Fan Or Fan ON At All Times
11 Dk Grn 335 Cooling Fan relay #1 Control Fan Relay 86 P1641 (3) Inoperative Cooling Fan Or Fan ON At All Times
12           Not Used
13 Wht 121 Engine Speed Output Signal * P1643 (3) Tach inoperative
14 Brn 436 AIR Pump Relay Control AIR Pump Relay 86 P0412 (3) AIR Pump Inoperative or ON at All Times.
15-17           Not Used
18 Blk/Wht 451 PCM Ground Engine Ground

*

  Engine cranks but will not start.
19 Lt Grn /Blk 1745 Injector #2 Control Injector #2 A P0200 (3) P1222 Rough idle, Engine miss
20 Blk/Wht 845 Injector #5 Control Injector #5 A P0200 (3) P1222 Rough idle, Engine miss
21 Pnk/Blk 1746 Injector #3 Control Injector #3 A P0200 (3) P1222 Rough idle, Engine miss
22 Dk Blu/Wht 878 Injector #8 Control Injector #8 A P0200 (3) P1222 Rough idle, Engine miss
23-30           Not Used
31 Ppl 401 VSS Signal Low VSS A P0500 P0502 P0503 P1652 (1) Inoperative Speedometer, Inoperative Cruise Control, Radio Volume will not increase with vehicle Speed, Transmission Restricted to second Gear.
32 Yel 400 VSS Signal High VSS B P0500 P0502 P0503 P1652 (1) Inoperative Speedometer, Inoperative Cruise Control, Radio Volume will not increase with vehicle Speed, Transmission Restricted to second Gear.

 

 

PCM Connector C2 (Black) (1) Open Circuit (2) Grounded Circuit (3) Open/Grounded Circuit (4) Shorted To Voltage * Refer To Electrical Diagnosis
Pin Wire Color Circuit No. Function Component Connector Cavity DTC(s) Affected Possible Symptoms From a Faulty Circuit
1 Dk Grn/Wht 762 A/C Request Signal A/C Pressure cycling switch B   A/C Inoperative (1)

A/C ON at all times

2 Red/Blk 453 Low Resolution Signal Test Connector A Distributor A P1371 (3) Engine Cranks But Will Not Start (1)
3 Pnk/Blk 632 Distributor Reference Low Signal Test Connector D Distributor D   Engine Cranks But Will Not Start (1)
4           Not Used
5 Wht 423 Ignition Control Ignition Coil Module B P1351 (1,4) P1361 (2) Engine Cranks But Will Not Start (1)
6 Blk 470 Sensor Ground ECT A, TP B, EOT A Trans M, EBTCM P0118 (1) P0122 (1) P1118 (1) P0713 (1) P1188 Lack of Power, Rough Idle, High Idle and TCC May Not Apply Properly
7 Lt Grn 1222 Transmission 1-2 Shift Solenoid control Trans A P0753 (3,4) Second and Third Gear, or Forth Gear Only
8 Dk Grn/Wht 817 VSS Output Cruise module, CCM, Radio P1652 (3,4) Speedometer Inoperative

Cruise Inoperative

9-11           Not Used
12 Yel/Blk 1223 Transmission 2-3 Shift Solenoid control (LT1 Only) Trans B P0758 (3,4) Second or Third Gear Only, No TCC Apply
13 Brn or Gry 897 or 324 Transmission 3-2 Shift Solenoid control (LT1 Only) or 2nd and 3rd Gear Blockout Relay Control (LT4 Only) Trans S or 2nd and 3rd gear blockout relay 30 P0785 (3,4) or P1657 Harsh 3-2 Downshift, Third Gear Only

Or Will Not Blockout 2nd and 3rd Gear or 1st to 4th Gear Only

14 Red 631 Distributor Ignition Feed Test Connector C Distributor C   Engine Cranks But Will Not Start
15 Red 142 PCM Battery Feed * * Engine Cranks But Will Not Start
16 Blk 452 Sensor Ground MAP A IAT A, A/C refrigerant pressure sensor A P0113 (1) P0108 (1) P0530 (1) Poor Performance, A/C Inoperative
17-18           Not Used
19 Yel 492 MAF Sensor Signal MAF A P0100 P0101 P0102 (2) P0103 Engine Stall, Hesitation When Malfunction Occurs
20 Ppl/Wht 430 High Resolution Signal Test Connector B Distributor B P1372 (3,4) Engine Surge, Lack of Power
21 Dk Grn 59 A/C Clutch Status A/C clutch relay 30 A/C clutch A P1539 (4) P1546 (1) A/C Inoperative
22 Lt Blu/Blk 396 Cruise Active signal Cruise Control Module   modified Transmission Shift Patterns
23 Lt Blu 997 EVAP Vacuum Switch EVAP Vacuum Switch B P0441

P1441

 
24-27           Not Used
28 Gry 474 5 Volt reference TP A, EBTCM P0123 (3) High Idle, Lack of Performance
29 Gry 416 5 Volt reference MAP C, A/C Refrigerant Pressure Sensor B P0107 (3) P0530 (3) A/C Inoperative
30 Pnk 239 PCM Ignition Feed *   Engine Cranks But Will Not Start
31 Red 142 PCM Battery Feed *    
32           Not Used

 

PCM Connector C3 (Clear or Gray) (1) Open Circuit (2) Grounded Circuit (3) Open/Grounded Circuit (4) Shorted to Voltage (*) Refer to Electrical Diagnosis
Pin Wire Color Circuit No. Function Component Connector Cavity DTC(s) Affected Possible Symptoms From a Faulty Circuit
1 Lt Blu/Wht 1747 IAC Coil A High IAC D P0506

P0507

P1508

P1509

Incorrect Idle, Surge, Stall
2 Lt Blu/Blk 1748 IAC Coil A Low IAC C P0506

P0507

P1508

P1509

Incorrect Idle, Surge, Stall
3 Tan 1671 Bank 2 (Right Rear) HO2S #2 Low HO2S A    
4 Ppl 1670 Bank 2 (Right Rear) HO2S #2 High HO2S B    
5 Lt Grn/Blk 444 IAC Coil B Low IAC A P0506

P0507

P1508

P1509

Incorrect Idle, Surge, Stall
6 Lt Grn/Wht 1749 IAC Coil B High IAC B P0506

P0507

P1508

P1509

Incorrect Idle, Surge, Stall
7 Tan 1667 Bank 2 (Right Front) HO2S #2 Low HO2S A P0154 (1) Rough Idle, Lean Exhaust, Poor Performance and Poor Fuel Economy
8 Ppl 1666 Bank 2 (Right Front) HO2S #2 High HO2S B P0151 (2)

P0152 (4)

 
9-10           Not Used
11 Lt Grn 981 ASR Active Signal * P1572  
12 Gry/Blk 1687 ASR Spark Retard Signal *   Poor Performance, ABS/TCS DTC 73
13           Not Used
14 Ppl 420 Brake Switch Signal Brake Switch A P0703 (3,4) No TCC
15 Orn/Blk 434 PNP Switch PNP Switch B   Poor Fuel Economy, Stall, Incorrect Idle
16 Red/Blk 1228 Transmission Pressure Control Solenoid Transmission C P0748 (3) Harsh Transmission Shift
17 Tan/Wht 1669 Bank 1 (Left Rear) HO2S #2 Low HO2S A P0140 (1)  
18 Ppl/Wht 1668 Bank 1 (Left Rear) HO2S #2 High HO2S B P0137

P0138

P0140

 
19 Tan/Wht 1653 Bank 1 (Left Front) HO2S #1 Low HO2S B P0134 (1) Rough Idle, Lean Exhaust, Poor Performance and Poor Fuel Economy
20 Ppl/Wht 1665 Bank 1 (Left Front) HO2S #1 High HO2S B P0131 (2)

P0132 (4)

P0134 (1)

Rough Idle, Lean Exhaust, Poor Performance and Poor Fuel Economy
21 Tan 472 IAT Sensor Signal IAT B P0113 (1)

P0122 (2)

P1111 (2)

P1112 (1)

Poor Fuel Economy
22 Dk Blu 417 TP Sensor Signal TP Sensor C P0121

P0122 (4)

P0123 (3)

P1121 (3)

P1122 (4)

High Idle, Lack of Power, Harsh Transmission Shifts
23 Lt Grn 432 MAP Sensor Signal MAP B P0106

P0107 (3)

P0108 (4)

P1106 (4)

P1107 (3)

Modified Shift Patterns
24           Not Used
25 Yel 410 ECT Sensor Signal ECT B P0117 (2)

P0118 (1)

P0125

P1114 (2)

P1114 (1)

Exhaust Odor, Rough Idle, Poor Fuel Economy, TCC Apply Cold
26-27           Not Used
28 Pnk 1224 Transmission Range Signal A Transmission N P1810 (3) No TCC, Harsh Shift
29 Dk Blu 1225 Transmission Range Signal B Transmission R P1810 (3) No TCC, Harsh Shift
30 Red 1226 Transmission Range C Transmission P P1810 (3) No TCC, Harsh Shift
31           Not Used
32 Blk/Whit 451 PCM Ground Engine Block   Engine Cranks But Will Not Run

 

PCM Connector C4 (Blue) (1) Open Circuit (2) Grounded Circuit (3) Open/Grounded Circuit (4) Shorted to Voltage (*) Refer to Electrical Diagnosis
Pin Wire Color Circuit No. Function Component Connector Cavity DTC(s) Affected Possible Symptoms From a Faulty Circuit
1 Blk/Wht 451 PCM Ground Engine Block   Engine Cranks But Will Not Run
2 Lt Blu/Wht 1229 Transmission Pressure Control Solenoid Low Transmission D P0748 (3) Harsh Transmission Shifts
3 Pnk 239 PCM Ignition Feed *   Engine Cranks But Will Not Run
4-5           Not Used
6 Brn 418 Transmission TCC PWM Solenoid Transmission U   TCC Inoperative
7 Ppl 1807 Serial Data (Class 2) DLC 2   No Scan Tool Communications
8 Dk Grn/Wht 459 A/C Cutch Control A/C Clutch Relay 86 P1545

P1539

A/C Clutch Inoperative, A/C on At All Times
9 Brn/Wht 419 MIL Control * P1661 MIL On All Times or MIL Inoperative
10 Dk Grn/Wht 428 EVAP Canister Purge Solenoid Valve Control EVAP Canister Purge Solenoid Valve B P0443

P0441

Purge Inoperative or Purge On All The Time
11 Tan/Blk 422 Transmission TCC Solenoid Transmission T   TCC Inoperative or On All The Time
12 Red/Blk 380 A/C Refrigerant Pressure Sensor Signal A/C Refrigerant Pressure Sensor C P0530 A/C Inoperative
13-14           Not Used
15 Wht 375 1-4 Upshift Lamp Control 1 to 4 Upshift Lamp P1664 A/C Inoperative
16-19           Not Used
20 Wht/Blk 448 Output/Field Service Enable DLC 6 Low Pressure Tire Module    
21 Lt Blu 1876 Bank 1 (Left) Knock Sensor (KS) Signal Left Knock Sensor P0327 (3) Lack of Performance or Detonation
22 Dk Blu 496 Bank 2 (Right) Knock Sensor (KS) Signal Right Knock Sensor P0332 (3) Lack of Performance or Detonation
23-25           Not Used
26 Dk Grn/Wht 357 Engine Oil Temperature Sensor Signal EOT B P1187

P1188

 
27           Not Used
28 Yel/Blk 1227 Transmission Fluid Temperature Sensor Signal Transmission L P0712

P1188

Early or Delayed Transmission Shifts
29 Tan 800 Serial Data (UART) *    
30 Tan 800 Serial Data (UART) *    
31-32           Not Used