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Each connector can be identified as:

  1. C1 Blue (32 Pin Connector).
  2. C2 Red (32 Pin Connector).
  3. C3 Clear -or Grey- (32 Pin Connector).
  4. C4 Black (24 Pin Connector).

The symbol: <-> means that the Connector Pin # will have one of two different wires DEPENDING on the actual year of your vehicle or whether your it's equipped with a 4.3L, 5.0L, 5.7L, etc.

C1 (Blue) PCM 32 Pin Connector
Pin Wire Color Description
1 --- Empty
2 --- Empty
3 Brown w/ White stripe 1X Cam (CMP) Sensor Signal
4 --- Empty
5 --- Empty
6 --- Empty
7 Tan HO2S Low Bank 2 Sensor 1
8 Pink w/ Black stripe Cam (CMP) Sensor Ground (Low)
9 Purple Fuel Gauge (Fuel Level Output)
10 <-> --- Empty (1998 Only)
10 <-> Tan w/ Black stripe TCC Control Solenoid (1999 Only)
11 --- Empty
12 --- Empty
13 --- Empty
14 Brown AIR Relay Control (California Only)
15 Yellow w/ Black stripe Vehicle Speed Sensor (VSS)
16 --- Empty
17 --- Empty
18 <-> Purple w/ White stripe Dual Tank Fuel Module (1998 Only)
18 <-> --- Empty (1999 Only)
19 Purple w/ White stripe HO2S High Bank 1 Sensor 1
20 <-> Purple HO2S High Bank 1 Sensor 2 (1998 Only)
20 <-> Purple HO2S High Bank 2 Sensor 2 w/out C6P -under 8600 GVW (1999 Only)
20 <-> Purple HO2S High Bank 1 Sensor 2 w C6P -over 8600 GVW (1999 Only)
21 Purple HO2S High Bank 2 Sensor 1
22 <-> Purple w/ White stripe HO2S High Bank 2 Sensor 2 (1998 Only)
22 <-> Purple w/ White stripe HO2S High Bank 2 Sensor 2 w/ C6P -over 8600 GVW (1999 Only)
22 <-> Purple w/ White stripe HO2S High Bank 1 Sensor 2 w C6P -under 8600 GVW (1999 Only)
23 --- Empty
24 <-> Tan HO2S Low Bank 1 Sensor 2 (1998 Only)
24 <-> Tan HO2S Low Bank 2 Sensor 2 w/out C6P -under 8600 GVW (1999 Only)
24 <-> Tan HO2S Low Bank 1 Sensor 2 w/ C6P -over 8600 GVW (1999 Only)
25 Tan w/ White stripe HO2S Low Bank 1 Sensor 1
26 <-> Tan w/ White stripe HO2S Low Bank 2 Sensor 2 (1998 Only)
26 <-> Tan w/ White stripe HO2S Low Bank 2 Sensor 2 w/ C6P -over 8600 GVW (1999 Only)
26 <-> Tan w/ White stripe HO2S Low Bank 1 Sensor 2 w/out C6P -under 8600 GVW (1999 Only)
27 --- Empty
28 Purple Crank (CKP) Sensor Ground (Low)
29 Light Green w/ Black Vehicle Speed Sensor (VSS) Low
30 Purple w/ White stripe Vehicle Speed Sensor (VSS) Signal
31 Yellow 4X Crank (CKP) Sensor Signal
32 --- Empty

C2 (Red) PCM 32 Pin Connector
Pin Wire Color Description
1 --- Empty
2 White Canister Vent Solenoid Control
3 --- Empty
4 Yellow w/ Black stripe 2-3 Shift Solenoid Control
5 --- Empty
6 Light Green 1-2 Shift Solenoid Control
7 Brown PWM TCC Solenoid Control
8 Black Injector #1 Control
9 Dark Blue w/ White stripe Injector #8 Control
10 Brown EGR Pintle Position
11 Light Green w/ Black stripe Injector #2 Control
12 Red w/ Black wire Injector #7 Control
13 Light Green w/ White stripe Idle Air Control (IAC) B High
14 Light Blue w/ White stripe Idle Air Control (IAC) A High
15 Black w/ White stripe Injector #5 Control
16 Yellow w/ Black stripe Injector #6 Control
17 --- Empty
18 --- Empty
19 Dark Blue Knock Sensor Signal
20 --- Empty
21 Light Green Manifold Absolute Pressure (MAP) Signal
22 Tan Intake Air Temp (IAT) Signal
23 Yellow Engine Coolant Temp (ECT) Signal
24 Dark Blue Throttle Position Sensor (TPS) Signal
25 Dark Green Fuel Tank Vacuum Sensor Signal
26 --- Empty
27 Yellow w/ Black stripe TFT Signal (Automatic Transmission Only)
28 Yellow Mass Air Flow (MAF) Sensor Signal
29 Light Green w/ Black stripe Idle Air Control (IAC) B Low
30 Light Blue w/ Black stripe Idle Air Control (IAC) A Low
31 Light Blue w/ Black stripe Injector #4 Control
32 Pink w/ Black stripe Injector #3 Control

C3 (Grey -Clear-) PCM 32 Pin Connector
Pin Wire Color Description
1 Dark Green w/ White stripe A/C Compressor Clutch Relay Control
2 Dark Green w/ White stripe Purge Canister Solenoid
3 --- Empty
4 Black Engine Coolant Temp (ECT) and Throttle Position Sensor (TPS) Ground
5 --- Empty
6 Red w/ Black stripe PC Solenoid Valve High
7 Dark Blue w/ White stripe Input Speed Sensor Low
8 Red w/ Black stripe Input Speed Sensor High
9 White Ignition Control Module (ICM) Control
10 --- Empty
11 Red Transmission Range Signal C
12 Gray 5 Volt Reference
13 Purple w/ White stripe Fuel Level Module (Single Tank)
14 Dark Blue A/C Recirculation Signal
15 --- Empty
16 Light Blue w/ White stripe PC Solenoid Low (Automatic Transmission Only)
17 Black w/ White stripe System Ground
18 Black w/ White stripe System Ground
19 Black Sensor Ground (IAT/MAP/EGR, etc.)
20 --- Empty
21 Orange 12 Volt Battery Feed
22 Dark Blue Transmission Range Signal B
23 Pink Transmission Range Signal A
24 --- Not Used
25 Dark Green w/ White stripe A/C Request Signal
26 --- Empty
27 Grey EGR, MAP 5 Volt Reference
28 --- Empty
29 --- Empty
30 Dark Green A/C Compressor Cycling Switch Signal
31 --- Empty
32 --- Empty

C4 (Black) PCM 24 Pin Connector
Pin Wire Color Description
1 Dark Green w/ White stripe Fuel Pump Relay Control
2 --- Empty
3 Dark Green w/ White stripe Vehicle Speed Sensor (VSS) Output Signal (TCCM, Radio, Cruise)
4 Dark Green Vehicle Speed Sensor (VSS) Output Signal (Speedometer)
5 Brown w/ White stripe Malfunction Indicator Light (MIL) ...Check Engine Light
6 --- Empty
7 Dark Green Inlet Air Actuator (Recirculation Door Motor) Control
8 --- Empty
9 Dark Blue Auxiliary Electric Cooling Fan
10 Purple Brake Switch Signal
11 Purple Serial Data (Class 2)
12 Black Dual Fuel Module Return
13 Brown 12 Volt Ignition Feed
14 --- Empty
15 <-> --- Empty (1998 Only)
15 <-> Tan w/ Black Shift Light (Manual Transmission -1999 Only)
16 Red EGR Valve Solenoid Control
17 --- Empty
18 Pink 12 Volt Ignition Feed
19 Black w/ White stripe 4WD Engaged Signal (Wheel Lock Input)
20 White EGR Valve Solenoid Control
21 --- Empty
22 <-> --- Empty (1998 Only)
22 <-> Brown w/ White stripe CPP Switch Signal (Manual Transmission -1999 Only)
23 Gray w/ Black stripe Transfer Case High Low Switch
24 Light Blue w/ Black stripe Cruise Engaged Signal

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