1998-99 PCM Connector Pin Out Charts (GM 4.3L, 5.0L, 5.7L)

: Hits: 196

Each connector can be identified as:

C1 Blue (32 Pin Connector).
C2 Red (32 Pin Connector).
C3 Clear -or Grey- (32 Pin Connector).
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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