These are the BLUE & RED PCM connector pinouts that will cover 1999‐2002 F‐Body ONLY . 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. You can use this info for a Corvette harness, should be very close, pay attention to location of 5v references and ground references. Corvette will also have some extra wires for drive by wire stuff, and won't have throttle position sensor.
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, and EGR, then you will not want to remove those components. Any wire NOT highlighted does not get touched, its required for proper engine/transmission control.
When you are removing wires from the harness, for instance pin 70 of blue connector, oil level switch. This brown wire will lead you to a connector that will have another wire on it. This other wire can be removed as well. In this instance, it will be a black wire, that will go to a ground splice. Simply snip this black wire from the ground splice, and you can remove the connector with its two wires together. Same rules apply to other connectors you will get to that may have other wires once you get to it, rear oxygen sensors when you remove the two wires from the PCM, you will have a PINK and BLACK remaining, those two are again, traced back to their origin, and removed.
F Body 99‐02 LS1 Connector C1 BLUE
F Body 99‐02 LS1 Connector C1 BLUE
Pin Wire Color
Circuit No.
Function
Pin
Wire Color
Circuit No.
Function
1
BLK
451
PCM Ground
41
‐‐
‐‐
Not Used
2
LT GRN
1867
12 Volt Reference
42
DK GRN
335
Low Speed Cooling Fan Relay Control
3
PNK/BLK
1746
Fuel Injector 3 Control
43
RED/BLK
877
Fuel Injector 7 Control
4
LT GRN/BLK
1745
Fuel Injector 2 Control
44
LT BLU/BLK
844
Fuel Injector 4 Control
5
‐‐
‐‐
Not Used
45
GRA
474
5 Volt Reference (A/C Refrigerant Pressure Sensor)
6
‐‐
‐‐
Not Used
46
GRA
474
5 Volt Reference (Fuel Tank Pressure Sensor)
7
‐‐
‐‐
Not Used
47
GRA
‐‐
5 Volt Reference (EGR) 99‐00
8
GRA
596
5 Volt Reference (TPS)
48
GRA
416
5 Volt Reference (MAP Sensor)
9
‐‐
‐‐
Not Used
49
‐‐
‐‐
Not Used
10
‐‐
‐‐
Not Used
50
‐‐
‐‐
Not Used
11
LT BLU
1876
KS [2] Signal
51
DK BLU
496
KS [1] Signal
12 DK BLU/WHT
1869
CKP Sensor Signal
52
‐‐
‐‐
Not Used
13
‐‐
‐‐
Not Used
53
BLK
407
Low Referecne (Transmission Temperature Sensor)
14
‐‐
‐‐
Not Used
54
BLK
407
Low Reference (MAP Sensor Ground)
15
‐‐
‐‐
Not Used
55
BRN
1456
EGR Pintle Position Sensor Signal
16
‐‐
‐‐
Not Used
56
‐‐
‐‐
Not Used
17
DK BLU
1225
Transmission Fluid Pressure Switch Signal B
57
ORN
340
Battery Positive Voltage
18
RED
1226
Transmission Fluid Pressure Switch Signal C
58
DK GRN
1049
ECM/PCM/VCM Class 2 Serial Data
19
PNK
439
Ignition 1 Voltage
59
‐‐
‐‐
Not Used
20
ORN
340
Battery Positive Voltage
60
BLK
452
Low Reference TPS
21
YEL/BLK
1868
Low Reference CKP
61
PNK/BLK
632
Low Reference (Camshaft Position Sensor)
22
‐‐
‐‐
Not Used
62
‐‐
‐‐
Not Used
23
GRA
720
Low Reference not needed (C2xx Plug)
63
‐‐
‐‐
Not Used
24
‐‐
‐‐
Not Used
64
‐‐
‐‐
Not Used
25
TAN
1671
HO2S Low Signal [Bank 2 Sensor 2]
65
PPL
1670
HO2S High Signal [Bank 2 Sensor 2]
26
TAN
1667
HO2S Low Signal [Bank 2 Sensor 1]
66
PPL
1666
HO2S High Signal [Bank 2 Sensor 1]
27
‐‐
‐‐
Not Used
67
‐‐
‐‐
Not Used
28
TAN/WHT
1669
HO2S Low Signal [Bank 1 Sensor 2]
68
PPL/WHT
1668
HO2S High Signal [Bank 1 Sensor 2]
29
TAN/WHT
1653
HO2S Low Signal [Bank 1 Sensor 1]
69
PPL/WHT
1665
HO2S High Signal [Bank 1 Sensor 1]
30
‐‐
‐‐
Not Used
70
BRN
1174
Oil Level Switch Signal
31
‐‐
‐‐
Not Used
71
‐‐
‐‐
Not Used
32
GRY
48
CPP Switch Signal (clutch switch)
72
‐‐
‐‐
Not Used
33
PPL
420
TCC Brake Switch Signal
73
BRN/WHT
633
CMP Sensor Signal
34
ORN/BLK
434
Neutral Safety Switch Signal
74
YEL
410
ECT Sensor Signal
35
‐‐
‐‐
Not Used
75
‐‐
‐‐
Not Used
36
BLK
1744
Fuel Injector 1 Control
76
BLK/WHT
845
Fuel Injector 5 Control
37
YEL/BLK
846
Fuel Injector 6 Control
77
DK BLU/WHT
878
Fuel Injector 8 Control
39
‐‐
‐‐
Not Used
78
‐‐
‐‐
Not Used
39
‐‐
‐‐
Not Used
79
GRA or WHT
587 or 687 Skip Shift Solenoid Control (M/T) or 3‐2 Shift Solenoid Control (A/T)
40
BLK
451
Ground
80
BLK
407
Low Reference ECT
Tip: If you plan to run headers, you will need your oxygen sensor wires more rearward then stock harness has them. The FRONT and REAR sensors are the same plug, so, what you can do, is REMOVE the FRONT connectors, and then MOVE the pins for the REAR Sensor back into the location for the FRONTS at the PCM. You now have enough wire to reach any location for the oxygen sensors. You will remove the Tan & Purple for Bank 1 Sensor 1 completely. Then MOVE the Tan & Purple for Bank 1 Sensor 2, into the location you just removed B1S1's pins. Do the same for Bank 2. The picture of the wiring harness above on the right shows this done in finished form. The modified LS1 harness has the rear oxygen sensors re‐pinned for the front sensors, the front O2's connectors were removed. You can also leave these in stock location, if using stock manifolds.
F Body 99‐02 LS1 Connector C2 RED
Pin Wire Color
Circuit No.
Function
1
BLK
451
Ground
2
BRN
418
TCC Solenoid ‐ Output ‐ PWM
3
‐‐
‐‐
Not Used
4
PNK/BLK
429
Air Injection Reaction Solenoid Relay ‐ Coil ‐ Control
5
‐‐
‐‐
Not Used
6
RED/BLK
1228
PC Solenoid Valve High Control (Sol.A)
7
‐‐
‐‐
Not Used
8 LT BLU/WHT
1229
PC Solenoid Valve Low Control (Sol.A)
9 DK GRN/WHT
465
Fuel Pump Relay Control [Primary]
10
WHT
121
Engine Speed Signal
11
‐‐
‐‐
Not Used
12
‐‐
‐‐
Not Used
13
WHT
85
Cruise Control Engage Signal
14
RED/BLK
380
A/C Refrigerant Pressure Sensor Signal
15
RED
225
Generator Turn ON Signal
16
‐‐
‐‐
Not Used
17 DK GRN/WHT
762
A/C Request Signal
18
DK GRN
59
A/C Compressor Clutch Supply Voltage
19
‐‐
‐‐
Not Used
20 LT GRN/BLK
822
VSS Low Signal
21
PPL/WHT
821
VSS High Signal
22
‐‐
‐‐
Not Used
23
‐‐
‐‐
Not Used
24
DK BLU
417
TP Sensor Signal
25
TAN
472
IAT Sensor Signal
26
PPL
2121
IC 1 Control
27
RED
2127
IC 7 Control
28 LT BLU/WHT
2126
IC 6 Control
29 DK GRN/WHT
2124
IC 4 Control
30
DK BLU
229
Fuel Enable Control
31
YEL
492
MAF Sensor Signal
32
LT GRN
432
MAP Sensor Signal
33
DK BLU
473
High Speed Cooling Fan Relay Control
34 DK GRN/WHT
428
EVAP Canister Purge Solenoid Control
35
‐‐
‐‐
Not Used
36
BRN
436
AIR Pump Relay Control
37
DK GRN
83
Cruise Control Inhibit Signal
38
‐‐
‐‐
Not Used
39
RED
631
12 Volt Reference CMP
40
BLK
451
Ground
F Body 99‐02 LS1 Connector C2 RED
Pin
Wire Color
Circuit No.
41
GRY
‐‐
42
TAN/BLK
422
43
DK GRN/WHT
459
44
WHT
1652
45
WHT
1310
46
BRN/WHT
419
47
YEL/BLK
1223
48
LT GRN
1222
49
‐‐
‐‐
50
DK GRN/WHT
817
51
YEL/BLK
1227
52
‐‐
‐‐
53
GRA/BLK
1687
54
PPL
1589
55
‐‐
‐‐
56
‐‐
‐‐
57
PPL
719
58
‐‐
‐‐
59
‐‐
‐‐
60
BRN
2129
61
BRN/WHT
2130
62
‐‐
‐‐
63
PNK
1224
64
DK GRN
890
65
‐‐
‐‐
66
PPL/WHT
2128
67
RED/WHT
2122
68
DK GRN
2125
69
LT BLU
2123
70
‐‐
‐‐
71
‐‐
‐‐
72
‐‐
‐‐
73
‐‐
‐‐
74
‐‐
‐‐
75
‐‐
‐‐
76
LT GRN/WHT
1749
77
LT GRN/BLK
444
78
LT BLU/BLK
1748
79
LT BLU/WHT
1747
80
‐‐
‐‐
Function
EGR Solenoid Ground 99‐00
TCC Solenoid Valve Control
A/C Clutch Relay Control
Reverse Lock Out Solenoid Control (MANUAL TRANS T56 ONLY)
EVAP Canister Vent Solenoid Control
MIL Control (CHECK ENGINE LIGHT)
2 ‐ 3 Shift Solenoid Valve Control
1 ‐ 2 Shift Solenoid Valve Control
Not Used
VSS Signal
TFT Sensor Signal
Not Used
Ignition Retard Signal
Fuel Level Sensor Signal
Not Used
Not Used
Low Reference IAT
Not Used
Not Used
Ignition Control Low Reference
Ignition Control Low Reference
Not Used
Transmission Fluid Pressure Switch Signal A
Fuel Tank Pressure Sensor Signal
Not Used
IC 8 Control
IC 2 Control
IC 5 Control
IC 3 Control
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
IAC Coil B High Control
IAC Coil B Low Control
IAC Coil A Low Control
IAC Coil A High Control
Not Used
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