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HOME PCM PROGRAMMING WIRE HARNESS INFO Active Fuel Management DELETE

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The following PCM Pinouts will cover all LT1, 1994 to 1997. There are notes in the Functions column that may say this was only in a F-Body, or B-Body, etc. Also all 1996+ OBD2 pins are listed, of course, if you have a 1994 or 1995 those pins will be empty. If you get to a pin that my chart shows a wire, and you don't have one in your harness, its very likely you don't need it for stand alone conversion. Also keep in mind that this is for the basic engine/trans. This will remove air conditioning controls, emission controls, etc.

Wires to keep for EXTERNAL CONNECTIONS are BLUE

Wires to remove are YELLOW

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

PCM Connector C1 (RED)
Pin Wire Color Circuit No Function
1YEL573CKP Signal
2BLK/WHT451PCM Ground
3BLK1744Inj #1 Control
4LT BLU/BLK844Inj #4 Control
5YEL/BLK846Inj #6 Control
6RED/BLK877Inj #7 Control
7DK GRN/WHT465FP Relay Control (PCM Supplies 12v+)
8not used
9GRY435EGR Solenoid Control
10DK BLU473Cooling Fan #2 & #3 Relay Control (PCM Supplies GROUND)
11DK GRN335Cooling Fan #1 Relay Control (PCM Supplies GROUND)
12TAN/BLK464EBTCM TP Sensor Signal
13WHT121Engine Speed Output Signal (TACH)
14BRN436AIR Pump Relay Control
15DK/BLU1493Transmission Mode Lamp Control (F-Body ONLY)
16not used
17not used
18TAN/WHT551PCM Ground
19LT GRN/BLK1745Inj #2 Control
20BLK/WHT845Inj #5 Control
21PNK/BLK1746Inj #3 Control
22DK BLU/WHT878Inj #8 Control
23ORN/BLK463Traction Control Spark Retard Request
24not used
25BLU229Fuel Enable Signal
26not used
27not used
28not used
29not used
30not used
31PPL401VSS Signal Low
32YEL400VSS Signal High
PCM Connector C2 (BLACK)
Pin Wire Color Circuit No Function
1DK GRN/WHT F-Body (BLUE B-Body)762A/C Request Signal
2RED/BLK453Low Resolution Signal
3PNK/BLK632Distributor Reference Low Signal
4not used
5WHT423Ignition Control
6BLK470Sensor Ground
7LT GRN1222Transmission 1-2 Shift Sol Control
8DK GRN/WHT817VSS Output (4000 Pulse/Mile)
9not used
10not used
11BRN/WHT1173Low Oil Lamp Control (B-Body ONLY)
12YEL/BLK1223Transmission 2-3 Shift Sol Control
13WHT or GRY687 or 587Transmisison 3-2 Shift Sol Control AUTO or Skip Shift Sol Control MANUAL
14RED631Distributor Ignition Feed
15ORN340PCM Battery Positive Voltage
16BLK452Sensor Ground
17not used
18PNK/BLK1994 B-Body ONLY - NOT NEEDED
19YEL492MAF Sensor Signal
20PPL/WHT430High Resolution Signal
21DK GRN59A/C Clutch Status
22TAN/WHT585TCC Fluid Temp Switch Signal (5.7L B-Body ONLY)
23PPL1986EVAP Vacuum Switch Signal (OBD2 ONLY)
24not used
25not used
26ORN/BLK495Power Steering Pressure Switch Signal (B-Body ONLY)
27BRN1174Engine Oil Level Sensor Signal (B-Body ONLY)
28GRY4745 Volt Reference
29GRY4165 Volt Reference
30PNK439PCM Ignition Positive Voltage
31ORN340PCM Battery Positive Voltage
32not used
PCM Connector C3 (CLEAR)
Pin Wire Color Circuit No Function
1LT BLU/WHT1747IAC Coil A High
2LT BLUE/BLK1748IAC Coil A Low
3TAN1671HO2S B2S2 Low 1996+
4PPL1670HO2S B2S2 High 1996+
5LT GRN/BLK444IAC Coil B Low
6LT GRN/WHT1749IAC Coil B High
7TAN1667HO2S B2S1 Low
8PPL1666HO2S B2S1 High
9not used
10not used
11LT BLU832Traction Control System Active Signal (F-Body ONLY)
12not used
13LT BLU553Performance Mode Switch Signal (F-Body ONLY)
14LT BLU/BLK or PPL583 or 420Brake Switch Signal (F-Body) or (B-Body) (12v+ When brakes are NOT pressed. Switch opens circuit, so no voltage to this pin when brakes ARE pressed.
15ORN/BLK434PNP Switch
16RED/BLK1228Transmission Pressure Control Sol
17TAN/WHT1669HO2S B1S2 Low 1996+
18PPL/WHT1668HO2S B1S2 High 1996+
19TAN/WHT1653HO2S B1S1 Low
20PPL/WHT1665HO2S B1S1 High
21TAN472IAT Sensor Signal
22DK BLU417TP Sensor Signal
23LT GRN432MAP Sensor Signal
24not used
25YEL410ECT Sensor Signal
26not used
27not used
28PNK1224Transmission Fluid Pressure Switch Signal A
29DK BLU1225Transmission Fluid Pressure Switch Signal B
30RED1226Transmission Fluid Pressure Switch Signal C
31not used
32BLK/WHT451PCM Ground
PCM Connector C4 (BLUE)
Pin Wire Color Circuit No Function
1TAN/WHT551PCM Ground
2LT BLU/WHT1229Transmission Pressure Control Sol Low
3PNK439PCM Ignition Postive Voltage
4not used
5not used
6BRN or LT GRN418 or 1652Transmission TCC PWM Sol Control (AUTO 1995+) or Reverse Inhibit Sol Control (Manual)
7PPL1807Serial Data (Class 2) 1996+ (OBD2 Port Pin 2)
8DK GRN/WHT459A/C Clutch Relay Control
9BRN/WHT419MIL Control (PCM Supplies GROUND for light)
10DK GRN/WHT428EVAP Canister Purge Sol Control
11TAN/BLK422Transmission TCC Sol Control
12RED/BLK380A/C Refrigerant Pressure Sensor Signal
13not used
14not used
15WHT375Skip Shift Lamp Control (Manual)
16PNK1439Change Oil Lamp Control (B-Body ONLY)
17not used
18not used
19not used
20WHT/BLK448Output/Field Service Enable (Diag Port)
21LT BLU1876Knock Sensor Signal Left (1996+ B-Body ONLY)
22DK BLU496Knock Sensor Signal F-Body, 1994-95 B-Body (1996+ Right B-Body)
23not used
24DK BLU732A/C Evaporator Temp Sensor Signal (F-Body ONLY)
25not used
26DK GRN/WHT357Engine Oil Temp Sensor Signal (Corvette)
27not used
28YEL/BLK1227Transmission Fluid Temp Sensor Signal
29TAN800Serial Data (UART) (Some B-Body) (Diag Port)
30TAN800Serial Data (UART) (Most F-Body & B-Body) (Diag Port)
31not used
32not used