Engine Control System & Component Tests — Cadillac Escalade GMT400 (1998-2000)

MODEL IDENTIFICATION

Vehicle model is identified by fourth character of Vehicle Identification Number (VIN). VIN is stamped on metal pad on top of left end of instrument panel, near windshield. See MODEL IDENTIFICATION table.

Series (1)	Model
"C"	2WD Pickup, Sierra, Silverado, Suburban, Tahoe & Yukon
"G"	Cutaway, Express, RV Cutawy & Savana
"K"	4WD Pickup, Sierra, Silverado, Suburban, Tahoe & Yukon, & AWD Escalade
"L"	AWD Astro & Safari
"M"	2WD Astro & Safari
"P"	Forward Control (P42) & Motorhome (P32)
"S"	2WD Blazer, Envoy, Jimmy, Sonoma & S10 Pickup
"T"	4WD Blazer, Bravada, Envoy, Jimmy, Sonoma & S10 Pickup
"U"	Montana, Silhouette & Venture
(1) Vehicle series is fifth character of VIN.

(1)	Vehicle series is fifth character of VIN.

MODEL IDENTIFICATION

INTRODUCTION

Before testing separate components or systems, perform all procedures listed in appropriate BASIC DIAGNOSTIC PROCEDURES article. Since many computer-controlled and monitored components will set a Diagnostic Trouble Code (DTC) if they malfunction, it is also recommended self-diagnostics be performed. See appropriate SELF-DIAGNOSTICS article.

Note. Testing individual components does not isolate shorts or opens. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.

AIR INDUCTION SYSTEMS

Note. Manufacturer does not provide testing procedures for many individual systems and components. For system and component testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

TURBOCHARGER (6.5L DIESEL)

A malfunction in turbocharger boost system can set a related Diagnostic Trouble Code (DTC). For testing procedures, see appropriate SELF-DIAGNOSTICS article.

PCM OUTPUT DIAGNOSIS (2.2L)

Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
Turn ignition on with engine off. Connect scan tool to Data Link connector (DLC). If a No. 1 is displayed below any of the number output drivers, go to next step. If a No. 1 is not displayed below any of the number output drivers, go to step 4 .
Disconnect electrical connector from component related to malfunctioning circuit. If a No. 1 is still displayed below corresponding output driver, go to step 6 . If a No. 1 is not displayed below any of the number output drivers, go to step 9 .
Using scan tool, command output being checked while watching corresponding position for that circuit. If that circuits position does not change to a No. 1, go to next step. If that circuits position changes to a No. 1, go to step 7 .
If component or function does not operate when commanded, go to step 9 . If component or function operates when commanded, go to step 11 .
Turn ignition off. Check for an open, short to voltage or short to ground in any corresponding circuit that indicated a No. 1 below output driver. Repair component or component circuit as necessary and go to step 11 . If circuits are okay, go to step 10 .
Disconnect electrical connector from component related to malfunctioning circuit. Using scan tool, command output being checked while watching corresponding position for that circuit. If a No. 1 is still displayed below corresponding output driver, go to next step. If a No. 1 is not displayed below any of the number output drivers, go to step 9 .
Turn ignition off. Check for an open, short to voltage or short to ground in any corresponding circuit that indicated a No. 1 below output driver. Repair component or component circuit as necessary and go to step 11 . If circuits are okay, go to step 10 .
Diagnose and repair any component that malfunctioned when commanded with scan tool. After repairs, go to step 11 .
Replace PCM. Program replacement PCM using required equipment. After repairs, go to next step.
Start engine and operate vehicle under condition under which original symptom was noted. If system does not operate properly, go to step 2 . If system operates properly, go to «DIAGNOSTIC AIDS»(/cadillac/escalade/gmt400-1998-2000/remont/testing-diagnostics/#engine-control-system-component-tests__diagnostic-aids) .

Diagnostic Aids

Scan tool has the ability to command certain components and functions ON and OFF. If a component or function does not have this capability, operate vehicle during normal function criteria to check for an open or shorted circuit. An open or short to ground will appear in the open positions of the scan tool only when it is not commanded by the PCM or scan tool. A short to voltage will appear in the short positions on the scan tool only while the component is being commanded by the PCM or scan tool.

PCM POWER & GROUND CHECK

Note. To identify circuits referenced in the following ground and power tests, see appropriate wiring diagram in WIRING DIAGRAMS article.

Ground Circuits

Using an ohmmeter, check for continuity to ground at PCM/VCM ground terminals. See «POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION»(/cadillac/escalade/gmt400-1998-2000/remont/testing-diagnostics/#engine-control-system-component-tests). (Scheme 1)- (Scheme 4). Resistance should be zero ohms. If not, repair open to ground.
Using a voltmeter, connect negative lead of a voltmeter to a good ground. Backprobe positive lead of voltmeter to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If voltmeter reading is more than one volt, check for open, short to voltage, corrosion or loose connection on ground circuit.

Power Circuits

Using a voltmeter, check for battery voltage between PCM/VCM continuous power terminal(s) and ground. See «POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION»(/cadillac/escalade/gmt400-1998-2000/remont/testing-diagnostics/#engine-control-system-component-tests). (Scheme 1)- (Scheme 4). If battery voltage is not present, check for blown fuse or open fusible link. If okay, check for open in wire between PCM/VCM terminal and power source.
Turn ignition switch to RUN position. Using a voltmeter, check for battery voltage between PCM/VCM ignition power terminals and ground. If battery voltage is not present, check IGN fuse. If fuse is okay, check for an open in wire between battery and ignition switch, and between ignition switch and PCM/VCM terminal. If wiring is okay, check for a defective ignition switch.
Connect voltmeter between ground and PCM/VCM starter (crank) signal terminal. On vehicles with manual transmission/transaxle, depress clutch pedal. On vehicles with automatic transmission/transaxle, position gear shift lever in Park. On all vehicles, turn ignition switch to START position. Battery voltage should be present ONLY when ignition switch is in START position.
If voltage is not present, check CRANK fuse or fusible link between ignition switch and PCM/VCM terminal. If fuse or fusible link is okay, check for an open in wire between ignition switch and PCM/VCM terminal, or check for a defective ignition switch.

PCM Harness Resistance

Turn ignition switch to LOCK position. Disconnect PCM and appropriate component harness connectors. Check for open or short circuits between appropriate PCM harness connector terminal and appropriate component harness connector terminal. See POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION. (Scheme 1)- (Scheme 4). See appropriate wiring diagram in WIRING DIAGRAMS article. If harness is open or shorted, repair as necessary.

Scheme 1

Scheme 1: POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION

Scheme 2

Scheme 3

Scheme 4

POWERTRAIN CONTROL MODULE (PCM) - 2.2L

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1-5	—	Not Used
C1 (Blue)	6	ORG/BLK	(2) Ground
C1 (Blue)	7	BRN/WHT	CMP Sensor Signal
C1 (Blue)	8	PPL/WHT	CKP 7x Reference Signal
C1 (Blue)	9	—	Not Used
C1 (Blue)	10	GRY	Fuel Tank Pressure Sensor Reference Voltage
C1 (Blue)	11-17	—	Not Used
C1 (Blue)	180	BLK/WHT	PCM Ground
C1 (Blue)	19	PNK	Ignition Voltage
C1 (Blue)	20	ORN	Battery Voltage
C1 (Blue)	21	DK BLU	TP Sensor Signal
C1 (Blue)	22-24	—	Not Used
C1 (Blue)	25	ORN	Ignition Control B
C1 (Blue)	26	WHT	Ignition Control A
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	RED	Transmission Range C Input
C1 (Blue)	29	BLK/WHT	PRNDL A Input
C1 (Blue)	30-32	—	Not Used
C1 (Blue)	33	DK BLU	KS Signal
C1 (Blue)	34	—	Not Used
C1 (Blue)	35	PPL	TCC Brake Switch Input
C1 (Blue)	36	LT BLU	A/C Request Signal
C1 (Blue)	37-44	—	Not Used
C1 (Blue)	45	DK GRN	Fuel Tank Pressure Sensor Signal
C1 (Blue)	46	YEL/BLK	TFT Sensor Signal
C1 (Blue)	47 & 48	—	Not Used
C1 (Blue)	49	RED/BLK	A/C Refrigerant Pressure Sensor Signal
C1 (Blue)	50 & 51	—	Not Used
C1 (Blue)	52	BLK	A/C Refrigerant Pressure Sensor Ground
C1 (Blue)	53	—	Not Used
C1 (Blue)	54	YEL	ECT Sensor Signal
C1 (Blue)	55	PPL	Fuel Level Sensor Input
C1 (Blue)	56	—	Not Used
C1 (Blue)	57	BLK	TP Sensor Ground
C1 (Blue)	58	YEL	Serial Data (Class II)
C1 (Blue)	59	DK GRN	Serial Data (Class II)
C1 (Blue)	60	BLK/WHT	PCM Ground
C1 (Blue)	61	PNK	IGN 2
C1 (Blue)	62	LT GRN	MAP Sensor Signal
C1 (Blue)	63	PPL/WHT	VSS High
C1 (Blue)	64-66	—	Not Used
C1 (Blue)	67	DK BLU	Transmission Range B Input
C1 (Blue)	68	PNK	Transmission Range A Input
C1 (Blue)	69	YEL	PRNDL B
C1 (Blue)	70	YEL/BLK	High Resolution Vehicle Speed Output
C1 (Blue)	71	—	Not Used
C1 (Blue)	72	GRY	PRNDL C
C1 (Blue)	73	WHT	PRNDL P
C1 (Blue)	74	RED	Generator Terminal L
C1 (Blue)	75	BLK	Fuel Injector No. 1 Control
C1 (Blue)	76	LT GRN/BLK	Fuel Injector No. 2 Control
C1 (Blue)	77-80	—	Not Used
C2 (Red)	1-5	—	Not Used
C2 (Red)	6	RED/BLK	Pressure Control Solenoid High Control
C2 (Red)	7	—	Not Used
C2 (Red)	8	DK GRN/WHT	Fuel Pump Relay Control
C2 (Red)	9	LT BLU/WHT	Pressure Control Solenoid Low Control
C2 (Red)	10	WHT	Tachometer Output
C2 (Red)	11-13	—	Not Used
C2 (Red)	14	BLK/WHT	MAP Sensor Ground
C2 (Red)	15	—	Not Used
C2 (Red)	16	DK GRN/WHT	VSS Output (Cruise)
C2 (Red)	17	DK GRN	VSS Output (Cluster)
C2 (Red)	18 & 19	—	Not Used
C2 (Red)	20	TAN	IAT Sensor Signal
C2 (Red)	21	TAN	HO2S 1 Low
C2 (Red)	22	PPL	HO2S 1 Signal
C2 (Red)	23	TAN/WHT	HO2S 2 Low
C2 (Red)	24	PPL/WHT	HO2S 2 Signal
C2 (Red)	25 & 26	—	Not Used
C2 (Red)	27	BRN	ECT Sensor Ground
C2 (Red)	28	GRY	IAT Sensor Ground
C2 (Red)	29	BLK	TFT Sensor Ground
C2 (Red)	30	—	Not Used
C2 (Red)	31	RED/BLK	ICM Reference Low
C2 (Red)	32	—	Not Used
C2 (Red)	33	GRY	TP Sensor Reference Voltage
C2 (Red)	34	GRY	A/C Refrigerant Pressure Sensor Reference Voltage
C2 (Red)	35	GRY	MAP Sensor Reference Voltage
C2 (Red)	36	RED	CMP Sensor Battery Voltage Supply
C2 (Red)	37-45	—	Not Used
C2 (Red)	46	BRN/WHT	MIL Control
C2 (Red)	47	—	Not Used
C2 (Red)	48	LT BLU/BLK	Cruise Engaged Input
C2 (Red)	49	—	Not Used
C2 (Red)	50	TAN/BLK	TCC Solenoid Control
C2 (Red)	51	YEL/BLK	2-3 Shift Solenoid Control
C2 (Red)	52	WHT	3-2 Shift Solenoid Control
C2 (Red)	53	LT GRN	1-2 Shift Solenoid Control
C2 (Red)	54	—	Not Used
C2 (Red)	55	DK GRN/WHT	A/C Compressor Clutch Relay Control
C2 (Red)	56	DK GRN/WHT	EVAP Canister Purge Valve Control
C2 (Red)	57	BRN	TCC PWM Solenoid Control
C2 (Red)	58	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	59-61	—	Not Used
C2 (Red)	62	LT GRN/BLK	VSS Low
C2 (Red)	63	PNK/BLK	CMP Sensor Ground
C2 (Red)	64	BLK/WHT	PCM Ground
C2 (Red)	65-70	—	Not Used
C2 (Red)	71	LT BLU/WHT	IAC Coil A High
C2 (Red)	72	LT GRN/WHT	IAC Coil B High
C2 (Red)	73	LT GRN/BLK	IAC Coil B Low
C2 (Red)	74	LT BLU/BLK	IAC Coil A Low
C2 (Red)	75	LT BLU/BLK	Fuel Injector No. 4 Control
C2 (Red)	76	PNK/BLK	Fuel Injector No. 3 Control
C2 (Red)	77-80	—	Not Used
(1) (Scheme 1) (2) Fuel tank pressure sensor, fuel level sensor and fuel pump grounds.

(1)	(Scheme 1)

(2)	Fuel tank pressure sensor, fuel level sensor and fuel pump grounds.

POWERTRAIN CONTROL MODULE (PCM) - 2.2L (1)

POWERTRAIN CONTROL MODULE (PCM) - 3.4L

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	ORG	Fuel Level Output
C1 (Blue)	4	LT GRN	Shift Solenoid A Control
C1 (Blue)	5	DK BLU	Cooling Fan High Speed Control
C1 (Blue)	6	DK GRN	Cooling Fan Low Speed Control
C1 (Blue)	7	BLK	Camshaft Position PCM Input
C1 (Blue)	8	PPL/WHT	CKP 3x Reference Signal
C1 (Blue)	9	LT BLU/BLK	CKP 24x Reference Signal
C1 (Blue)	10 & 11	—	Not Used
C1 (Blue)	12	BLK	Engine Coolant Temperature Sensor Ground
C1 (Blue)	13	ORG/BLK	Manifold Absolute Pressure Sensor Ground
C1 (Blue)	14	—	Not Used
C1 (Blue)	15	TAN	Serial Data
C1 (Blue)	16	BLK/WHT	PCM Ground
C1 (Blue)	17	YEL	Intake Air Temperature Sensor Ground
C1 (Blue)	18	—	Not Used
C1 (Blue)	19	PNK	Ignition Voltage
C1 (Blue)	20	ORG	Battery Voltage
C1 (Blue)	21-27	—	Not Used
C1 (Blue)	28	TAN/WHT	HO2S Sensor 2 Signal Low
C1 (Blue)	29	TAN	HO2S Sensor 1 Signal Low
C1 (Blue)	30	PPL	TCC Brake Switch
C1 (Blue)	31	BLK	EGR Valve Ground
C1 (Blue)	32	GRY	EGR Valve Ground
C1 (Blue)	33	DK BLU	Knock Sensor Signal
C1 (Blue)	34 & 35	—	Not Used
C1 (Blue)	36	BRN	Generator Light Signal
C1 (Blue)	37	—	Not Used
C1 (Blue)	38	LT GRN/WHT	Idle Air Control B High
C1 (Blue)	39-42	—	Not Used
C1 (Blue)	43	BLK	Fuel Injector No. 1 Control
C1 (Blue)	44	YEL/BLK	Shift Solenoid B Control
C1 (Blue)	45	—	Not Used
C1 (Blue)	46	PNK/BLK	Fuel Injector No. 3 Control
C1 (Blue)	47	LT GRN/BLK	Fuel Injector No. 2 Control
C1 (Blue)	48	RED/BLK	Reference Low
C1 (Blue)	49-52	—	Not Used
C1 (Blue)	53	TAN/BLK	By-Pass
C1 (Blue)	54	WHT	Ignition Control
C1 (Blue)	55	DK GRN	4k Pulse Per Mile
C1 (Blue)	56	BLK/WHT	PCM Ground
C1 (Blue)	57	BLK/WHT	PCM Ground
C1 (Blue)	58	—	Not Used
C1 (Blue)	59	PPL	Serial Data (Class 2)
C1 (Blue)	60	BLK/WHT	PCM Ground
C1 (Blue)	61	PPL	TP Sensor Ground
C1 (Blue)	62 & 63	—	Not Used
C1 (Blue)	64	YEL	Vehicle Speed Sensor High
C1 (Blue)	65	PPL	Vehicle Speed Sensor Low
C1 (Blue)	66 & 67	—	Not Used
C1 (Blue)	68	YEL	Transaxle Range Switch Input B
C1 (Blue)	69	YEL	Mass Airflow Signal
C1 (Blue)	70	DK BLU	Theft Deterrent Input
C1 (Blue)	71	ORG/BLK	Required Torque
C1 (Blue)	72	DK GRN	Cruise Control Inhibit
C1 (Blue)	73	BLK/WHT	Fuel Injector No. 5 Control
C1 (Blue)	74	—	Not Used
C1 (Blue)	75	DK GRN	Engine Hot Light Control
C1 (Blue)	76	DK GRN/WHT	EVAP Canister Purge Control
C1 (Blue)	77 & 78	—	Not Used
C1 (Blue)	79	YEL/BLK	Fuel Injector No. 6 Control
C1 (Blue)	80	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Valve Control
C2 (Red)	3	DK GRN/WHT	Fuel Pump Relay Control
C2 (Red)	4	RED	EGR Valve Control
C2 (Red)	5	BRN/WHT	MIL Control
C2 (Red)	6	BRN/WHT	Low Oil Level Light Control
C2 (Red)	7	LT BLU/WHT	Intake Air Control A High
C2 (Red)	8	WHT	Tachometer Output
C2 (Red)	9	TAN/BLK	Delivered Torque
C2 (Red)	10	PPL	HO2S Sensor 1 Signal High
C2 (Red)	11	PPL/WHT	HO2S Sensor 2 Signal High
C2 (Red)	12-15	—	Not Used
C2 (Red)	16	WHT	Transaxle Range P
C2 (Red)	17	—	Not Used
C2 (Red)	18	BLK/WHT	Transaxle Range D
C2 (Red)	19-21	—	Not Used
C2 (Red)	22	DK GRN/WHT	A/C Request Signal
C2 (Red)	23 & 24	—	Not Used
C2 (Red)	25	LT GRN	MAP Sensor Signal
C2 (Red)	26	YEL	ECT Sensor Signal
C2 (Red)	27	RED/BLK	A/C Refrigerant Pressure Sensor Signal
C2 (Red)	28	BRN	EGR Pintle Position Signal
C2 (Red)	29-32	—	Not Used
C2 (Red)	33	GRY	Reference Voltage A
C2 (Red)	34	GRY	Reference Voltage B
C2 (Red)	35	ORG	Sensor Ground
C2 (Red)	36-38	—	Not Used
C2 (Red)	39	DK GRN/WHT	A/C Compressor Clutch Relay Control
C2 (Red)	40 & 41	—	Not Used
C2 (Red)	42	LT BLU/BLK	Fuel Injector No. 4 Control
C2 (Red)	43	—	Not Used
C2 (Red)	44	LT BLU/BLK	Intake Air Control Valve A Low
C2 (Red)	45-48	—	Not Used
C2 (Red)	49	LT GRN/BLK	Intake Air Control Valve B Low
C2 (Red)	50	TAN	Intake Air Temperature Sensor Signal
C2 (Red)	51-54	—	Not Used
C2 (Red)	55	DK GRN	Fuel Tank Pressure Sensor Signal
C2 (Red)	56	GRY	Transaxle Range C
C2 (Red)	57	—	Not Used
C2 (Red)	58	BRN	Engine Oil Level Sensor Signal
C2 (Red)	59	WHT	Cruise Status
C2 (Red)	60	—	Not Used
C2 (Red)	61	RED	Generator Control
C2 (Red)	62-65	—	Not Used
C2 (Red)	66	DK BLU	Throttle Position Sensor Signal
C2 (Red)	67	—	Not Used
C2 (Red)	68	YEL/BLK	Transaxle Fluid Temperature Sensor
C2 (Red)	69	PPL	Fuel Level Input
C2 (Red)	70 & 71	—	Not Used
C2 (Red)	72	RED/WHT	CMP Sensor Ignition Voltage
C2 (Red)	73	BLK	CMP Sensor Ground
C2 (Red)	74-77	—	Not Used
C2 (Red)	78	BRN	TCC PWM Solenoid Control
C2 (Red)	79	TAN/BLK	TCC Enable Solenoid
C2 (Red)	80	—	Not Used
(1) (Scheme 2)

(1)	(Scheme 2)

POWERTRAIN CONTROL MODULE (PCM) - 3.4L (1)

POWERTRAIN CONTROL MODULE (PCM) - 4.3L ("G" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4-6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Sensor Ground
C1 (Blue)	9	PPL	Fuel Level Output
C1 (Blue)	10	TAN/BLK	TCC Solenoid Control
C1 (Blue)	11 & 12	—	Not Used
C1 (Blue)	13	WHT	3-2 Shift Solenoid Valve Control
C1 (Blue)	14	—	Not Used
C1 (Blue)	15	YEL/BLK	VSS Output
C1 (Blue)	16-18	—	Not Used
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	—	Not Used
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 1 Sensor 3 High
C1 (Blue)	23 & 24	—	Not Used
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN/WHT	HO2S Bank 1 Sensor 3 Low
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Sensor Ground
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS High
C1 (Blue)	31	YEL	CKP Sensor 3x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Valve Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Valve Control
C2 (Red)	7	BRN	TCC PWM Solenoid Valve Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11 & 12	—	Not Used
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	16	PNK/BLK	Fuel Injector No. 3 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Signal
C2 (Red)	20	—	Not Used
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	DK GRN	Fuel Tank Pressure Sensor Signal
C2 (Red)	26	—	Not Used
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC Coil B Low
C2 (Red)	30	LT BLU/BLK	IAC Coil A Low
C2 (Red)	31	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	32	LT BLU/BLK	Fuel Injector No. 4 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	Sensor Ground
C3 (Clear)	5	—	Not Used
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid Valve High
C3 (Clear)	7 & 8	—	Not Used
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Input
C3 (Clear)	12	GRY	Sensor Reference Voltage
C3 (Clear)	13	PPL	Fuel Level Sensor Signal
C3 (Clear)	14 & 15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Valve Low
C3 (Clear)	17	TAN/WHT	VCM Ground
C3 (Clear)	18	TAN/WHT	VCM Ground
C3 (Clear)	19	BLK	Sensor Ground
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Input
C3 (Clear)	23	PNK	Transmission Range A Input
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	GRN/WHT	A/C Request Signal
C3 (Clear)	26	WHT	PRNDL P
C3 (Clear)	27	GRY	Reference Voltage
C3 (Clear)	28	GRY	PRNDL C
C3 (Clear)	29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Cycling Switch Signal
C3 (Clear)	31	BLK/WHT	PRNDL A
C3 (Clear)	32	YEL	PRNDL B
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2	—	Not Used
C4 (Black)	3	DK GRN/WHT	VSS Output
C4 (Black)	4	DK GRN	VSS Output
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6-9	—	Not Used
C4 (Black)	10	PPL	Brake Switch Input
C4 (Black)	11	PPL	Serial Data (Class II)
C4 (Black)	12	—	Not Used
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14 & 15	—	Not Used
C4 (Black)	16	RED	EGR Valve Control
C4 (Black)	17	—	Not Used
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	—	Not Used
C4 (Black)	20	WHT	EGR Valve Ground
C4 (Black)	21-23	—	Not Used
C4 (Black)	24	LT BLU/BLK	Cruise Engaged Input
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 4.3L ("G" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 4.3L ("L" & "M" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4-6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Sensor Ground
C1 (Blue)	9	PPL	Fuel Level Output
C1 (Blue)	10	TAN/BLK	TCC Solenoid Control
C1 (Blue)	11 & 12	—	Not Used
C1 (Blue)	13	WHT	3-2 Shift Solenoid Valve Control
C1 (Blue)	14	—	Not Used
C1 (Blue)	15	YEL/BLK	VSS Output
C1 (Blue)	16-18	—	Not Used
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	—	Not Used
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 1 Sensor 3 High
C1 (Blue)	23	—	Not Used
C1 (Blue)	24	TAN/WHT	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN/WHT	HO2S Bank 1 Sensor 3 Low
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Sensor Ground
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS High
C1 (Blue)	31	YEL	CKP Sensor 3x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Valve Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Valve Control
C2 (Red)	7	BRN	TCC PWM Solenoid Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11 & 12	—	Not Used
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	16	PNK/BLK	Fuel Injector No. 3 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Signal
C2 (Red)	20	—	Not Used
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	DK GRN	Fuel Tank Pressure Sensor Signal
C2 (Red)	26	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC Coil B Low
C2 (Red)	30	LT BLU/BLK	IAC Coil A Low
C2 (Red)	31	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	32	LT BLU/BLK	Fuel Injector No. 4 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	Sensor Ground
C3 (Clear)	5	—	Not Used
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid High
C3 (Clear)	7 & 8	—	Not Used
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Input
C3 (Clear)	12	GRY	Sensor Reference Voltage
C3 (Clear)	13	PPL/WHT	Fuel Level Sensor Signal
C3 (Clear)	14 & 15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Low
C3 (Clear)	17	BLK/WHT	VCM Ground
C3 (Clear)	18	BLK/WHT	VCM Ground
C3 (Clear)	19	BLK	Sensor Ground
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Input
C3 (Clear)	23	PNK	Transmission Range A Input
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	GRN/WHT	A/C Request Signal
C3 (Clear)	26	WHT	PRNDL P
C3 (Clear)	27	GRY	Reference Voltage
C3 (Clear)	28	GRY	PRNDL C
C3 (Clear)	29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Cycling Switch Signal
C3 (Clear)	31	BLK/WHT	PRNDL A
C3 (Clear)	32	YEL	PRNDL B
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2	—	Not Used
C4 (Black)	3	DK GRN/WHT	VSS Output
C4 (Black)	4	DK GRN	VSS Output
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6-9	—	Not Used
C4 (Black)	10	PPL	Brake Switch Input
C4 (Black)	11	PPL	Serial Data (Class II)
C4 (Black)	12	TAN/WHT	HO2S Bank 1 Sensor 3 Low
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14	YEL	Serial Data (Class II)
C4 (Black)	15	—	Not Used
C4 (Black)	16	RED	EGR Valve Control
C4 (Black)	17	PNK	Ignition Voltage
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	—	Not Used
C4 (Black)	20	WHT	EGR Valve Ground
C4 (Black)	21-23	—	Not Used
C4 (Black)	24	LT BLU/BLK	Cruise Engaged Input
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 4.3L ("L" & "M" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 4.3L ("P" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4	PNK	Ignition Voltage
C1 (Blue)	5 & 6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Sensor Ground
C1 (Blue)	9	PPL	Fuel Level Signal
C1 (Blue)	10-14	—	Not Used
C1 (Blue)	15	YEL/BLK	VSS Output
C1 (Blue)	16-18	—	Not Used
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	—	Not Used
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 1 Sensor 3 High
C1 (Blue)	23 & 24	—	Not Used
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN/WHT	HO2S Bank 1 Sensor 3 Low
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Sensor Ground
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS High
C1 (Blue)	31	YEL	CKP Sensor 4x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Control
C2 (Red)	7	BRN	TCC PWM Solenoid Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11 & 12	—	Not Used
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	16	PNK/BLK	Fuel Injector No. 3 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Signal
C2 (Red)	20	—	Not Used
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	DK GRN	Fuel Tank Pressure Sensor Signal
C2 (Red)	26	—	Not Used
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC Coil B Low
C2 (Red)	30	LT BLU/BLK	IAC Coil A Low
C2 (Red)	31	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	32	LT BLU/BLK	Fuel Injector No. 4 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	ECT/TP Sensor Ground
C3 (Clear)	5	—	Not Used
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid High
C3 (Clear)	7	BLU/WHT	Input Shaft Speed Sensor Low
C3 (Clear)	8	RED/BLK	Input Shaft Speed Sensor High
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Signal
C3 (Clear)	12	GRY	TP Sensor Reference Voltage
C3 (Clear)	13	PPL	Fuel Level Input Signal
C3 (Clear)	14 & 15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Low
C3 (Clear)	17	BLK/WHT	PCM Ground
C3 (Clear)	18	BLK/WHT	PCM Ground
C3 (Clear)	19	BLK	Sensor Ground
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Signal
C3 (Clear)	23	PNK	Transmission Range A Signal
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	DK GRN/WHT	A/C Request Signal
C3 (Clear)	26	—	Not Used
C3 (Clear)	27	GRY	Reference Voltage (EGR/MAP)
C3 (Clear)	28 & 29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Signal
C3 (Clear)	31 & 32	—	Not Used
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2 & 3	—	Not Used
C4 (Black)	4	DK GRN	VSS Output (Speedometer)
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6-9	—	Not Used
C4 (Black)	10	PPL	Brake Signal
C4 (Black)	11	PPL	Serial Data (Class II)
C4 (Black)	12	—	Not Used
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14 & 15	—	Not Used
C4 (Black)	16	RED	EGR Valve Control
C4 (Black)	17	—	Not Used
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	—	Not Used
C4 (Black)	20	WHT	EGR Valve Ground
C4 (Black)	21-24	—	Not Used
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 4.3L ("P" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 4.3L ("S" & "T" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4-6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Sensor Ground
C1 (Blue)	9	—	Not Used
C1 (Blue)	10	TAN/BLK	TCC Solenoid Control
C1 (Blue)	11 & 12	—	Not Used
C1 (Blue)	13	WHT	3-2 Shift Solenoid Control
C1 (Blue)	14	BRN	AIR Pump Relay Control
C1 (Blue)	15	YEL/BLK	VSS Output
C1 (Blue)	16-18	—	Not Used
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	—	Not Used
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 1 Sensor 2 High
C1 (Blue)	23 & 24	—	Not Used
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN/WHT	HO2S Bank 1 Sensor 2 Low
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Sensor Ground
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS High
C1 (Blue)	31	YEL	CKP Sensor 3x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Control
C2 (Red)	7	BRN	TCC PWM Solenoid Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11 & 12	—	Not Used
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	16	PNK/BLK	Fuel Injector No. 3 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Signal
C2 (Red)	20	WHT	Tachometer Output
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	DK GRN	Fuel Tank Pressure Sensor Signal
C2 (Red)	26	—	Not Used
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC Coil B Low
C2 (Red)	30	LT BLU/BLK	IAC Coil A Low
C2 (Red)	31	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	32	LT BLU/BLK	Fuel Injector No. 4 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	Sensor Ground
C3 (Clear)	5	BRN	Generator Terminal L Control/Monitoring
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid High
C3 (Clear)	7 & 8	—	Not Used
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Input
C3 (Clear)	12	GRY	Sensor Reference Voltage
C3 (Clear)	13	PPL	Fuel Level Sensor Signal
C3 (Clear)	14 & 15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Low
C3 (Clear)	17	BLK/WHT	VCM Ground
C3 (Clear)	18	BLK/WHT	VCM Ground
C3 (Clear)	19	BLK	Sensor Ground
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Input
C3 (Clear)	23	PNK	Transmission Range A Input
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	GRN/WHT	A/C Request Signal
C3 (Clear)	26	WHT	PRNDL P
C3 (Clear)	27	GRY	Reference Voltage
C3 (Clear)	28	GRY	PRNDL C
C3 (Clear)	29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Cycling Switch Signal
C3 (Clear)	31	BLK/WHT	PRNDL A
C3 (Clear)	32	YEL	PRNDL B
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2	—	Not Used
C4 (Black)	3	DK GRN/WHT	VSS Output
C4 (Black)	4	DK GRN	VSS Output
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6-9	—	Not Used
C4 (Black)	10	PPL	Brake Switch Input
C4 (Black)	11	DK GRN	Serial Data (Class II)
C4 (Black)	12	—	Not Used
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14	YEL	Serial Data (Class II)
C4 (Black)	15	—	Not Used
C4 (Black)	16	RED	EGR Valve Control
C4 (Black)	17	PNK	Ignition Voltage
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	BLK/WHT	4WD Front Wheel Lock Input
C4 (Black)	20	WHT	EGR Valve Ground
C4 (Black)	21	—	Not Used
C4 (Black)	22	GRY	CPP Switch Signal
C4 (Black)	23	GRY/BLK	4WD Indicator Signal Input
C4 (Black)	24	LT BLU/BLK	Cruise Engaged Input
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 4.3L ("S" & "T" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 4.8L, 5.3L & 6.0L

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1	BLK	PCM Ground
C1 (Blue)	2	LT GRN	CKP Sensor Voltage Supply
C1 (Blue)	3	PNK/BLK	Fuel Injector No. 3 Control
C1 (Blue)	4	LT GRN/BLK	Fuel Injector No. 2 Control
C1 (Blue)	5-10	—	Not Used
C1 (Blue)	11	LT BLU	KS Signal Rear
C1 (Blue)	12	DK BLU/WHT	CKP Sensor Signal
C1 (Blue)	13-16	—	Not Used
C1 (Blue)	17	DK BLU	Transmission Range Signal B
C1 (Blue)	18	RED	Transmission Range Signal C
C1 (Blue)	19	PNK	PCM Ignition Supply
C1 (Blue)	20	ORG	PCM Battery Supply
C1 (Blue)	21	YEL/BLK	CKP Sensor Ground
C1 (Blue)	22	—	Not Used
C1 (Blue)	23	PPL	Sensor Ground
C1 (Blue)	24	—	Not Used
C1 (Blue)	25	TAN	HO2S Bank 2 Sensor 2 Signal Low
C1 (Blue)	26	TAN	HO2S Bank 2 Sensor 1 Signal Low
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	TAN/WHT	HO2S Bank 1 Sensor 2 Signal Low
C1 (Blue)	29	TAN/WHT	HO2S Bank 1 Sensor 1 Signal Low
C1 (Blue)	30	LT GRN	Engine Coolant Level Switch
C1 (Blue)	31	—	Not Used
C1 (Blue)	32	BLK/WHT	PRND A
C1 (Blue)	33	PPL	TCC Brake Switch
C1 (Blue)	34	WHT	PRND P
C1 (Blue)	35	GRY	Clutch Switch Signal
C1 (Blue)	36	BLK	Fuel Injector No. 1 Control
C1 (Blue)	37	YEL/BLK	Fuel Injector No. 6 Control
C1 (Blue)	38 & 39	—	Not Used
C1 (Blue)	40	BLK/WHT	PCM Ground
C1 (Blue)	41	BLK	Sensor Ground
C1 (Blue)	42	—	Not Used
C1 (Blue)	43	RED/BLK	Fuel Injector No. 7 Control
C1 (Blue)	44	LT BLU/BLK	Fuel Injector No. 4 Control
C1 (Blue)	45	GRY	Fuel Tank Pressure Sensor Reference Voltage
C1 (Blue)	46	GRY	TP Sensor Reference Voltage
C1 (Blue)	47	GRY	MAP Sensor Reference Voltage
C1 (Blue)	48	GRY	EGR Pintle Position Sensor Reference Voltage
C1 (Blue)	49 & 50	—	Not Used
C1 (Blue)	51	DK BLU	KS Signal Front
C1 (Blue)	52	—	Not Used
C1 (Blue)	53	BLK	Fuel Tank Pressure Sensor Ground
C1 (Blue)	54	BLK	TP Sensor Ground
C1 (Blue)	55	BRN	EGR Pintle Position Sensor Signal
C1 (Blue)	56	—	Not Used
C1 (Blue)	57	ORG	PCM Battery Supply
C1 (Blue)	58	DK GRN	Serial Data
C1 (Blue)	59	YEL	Serial Data
C1 (Blue)	60	ORG/BLK	MAP Sensor Ground
C1 (Blue)	61	PNK/BLK	CMP Sensor Ground
C1 (Blue)	62	—	Not Used
C1 (Blue)	63	GRY	ECT Sensor Ground
C1 (Blue)	64	—	Not Used
C1 (Blue)	65	PPL	HO2S Bank 2 Sensor 2 Signal High
C1 (Blue)	66	PPL	HO2S Bank 2 Sensor 1 Signal High
C1 (Blue)	67	—	Not Used
C1 (Blue)	68	PPL/WHT	HO2S Bank 1 Sensor 2 Signal High
C1 (Blue)	69	PPL/WHT	HO2S Bank 1 Sensor 1 Signal High
C1 (Blue)	70	BRN	Low Oil Level Switch
C1 (Blue)	71	—	Not Used
C1 (Blue)	72	YEL	PRND B
C1 (Blue)	73	BRN/WHT	CMP Sensor Signal
C1 (Blue)	74	YEL	ECT Sensor Signal
C1 (Blue)	75	PNK	PCM Ignition Supply
C1 (Blue)	76	BLK/WHT	Fuel Injector No. 5 Control
C1 (Blue)	77	DK BLU/WHT	Fuel Injector No. 8 Control
C1 (Blue)	78	—	Not Used
C1 (Blue)	79	WHT	3-2 Shift Solenoid Control
C1 (Blue)	80	ORG/BLK	Fuel Level Sensor Ground
C2 (Red)	1	BLK/WHT	PCM Ground
C2 (Red)	2	BRN	TCC Control Solenoid
C2 (Red)	3-5	—	Not Used
C2 (Red)	6	RED/BLK	Trans Fluid Pressure Control Solenoid High
C2 (Red)	7	RED	EGR Solenoid Supply
C2 (Red)	8	LT BLU/WHT	Trans Fluid Pressure Control Solenoid Low
C2 (Red)	9	DK GRN/WHT	Fuel Pump Relay Control
C2 (Red)	10	WHT	Engine Speed (Tach) Output Signal
C2 (Red)	11	DK BLU	Secondary A/C High Pressure Switch
C2 (Red)	12	—	Not Used
C2 (Red)	13	LT BLU/BLK	Cruise Control Engage Signal
C2 (Red)	14	—	Not Used
C2 (Red)	15	BRN	Generator L Terminal
C2 (Red)	16	GRY/BLK	4WD Switch Signal Low
C2 (Red)	17	DK GRN/WHT	A/C Request Signal
C2 (Red)	18	—	Not Used
C2 (Red)	19	BLK/WHT	4WD Front Axle Switch
C2 (Red)	20	LT GRN/BLK	VSS Reference Low
C2 (Red)	21	PPL/WHT	VSS Signal
C2 (Red)	22	RED/BLK	VSS Signal (6.0L)
C2 (Red)	23	DK BLU/WHT	VSS Reference Low (6.0L)
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	TAN	IAT Sensor Signal
C2 (Red)	26	PPL	Ignition Control No. 1
C2 (Red)	27	RED	Ignition Control No. 7
C2 (Red)	28	LT BLU/WHT	Ignition Control No. 6
C2 (Red)	29	DK GRN/WHT	Ignition Control No. 4
C2 (Red)	30	—	Not Used
C2 (Red)	31	YEL	MAF Sensor Signal
C2 (Red)	32	LT GRN	MAP Sensor Signal
C2 (Red)	33	DK GRN	HVAC Recirculation Door Control
C2 (Red)	34	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C2 (Red)	35	—	Not Used
C2 (Red)	36	BRN	AIR Pump Relay Control
C2 (Red)	37 & 38	—	Not Used
C2 (Red)	39	RED	CMP Sensor Voltage Supply
C2 (Red)	40	BLK/WHT	PCM Ground
C2 (Red)	41	WHT	EGR Solenoid Ground
C2 (Red)	42	TAN/BLK	TCC Enable Circuit
C2 (Red)	43	DK GRN/WHT	A/C Compressor Clutch Relay Control
C2 (Red)	44	—	Not Used
C2 (Red)	45	WHT	EVAP Canister Vent Valve Control
C2 (Red)	46	BRN/WHT	MIL Control
C2 (Red)	47	YEL/BLK	Transmission Shift Solenoid B
C2 (Red)	48	LT GRN	Transmission Shift Solenoid A
C2 (Red)	49	YEL/BLK	Vehicle Speed Output Circuit 128K
C2 (Red)	50	DK GRN/WHT	Vehicle Speed Output Circuit 4K
C2 (Red)	51	YEL/BLK	Transmission Temperature Sensor Signal
C2 (Red)	52 & 53	—	Not Used
C2 (Red)	54	PPL	Fuel Level Sensor Signal
C2 (Red)	55	DK GRN	A/C Compressor Cycling Switch Signal
C2 (Red)	56	—	Not Used
C2 (Red)	57	BLK	IAT Sensor Ground
C2 (Red)	58 & 59	—	Not Used
C2 (Red)	60	BRN	IC Reference Low Bank 1
C2 (Red)	61	BRN/WHT	IC Reference Low Bank 2
C2 (Red)	62	GRY	PRND C
C2 (Red)	63	PNK	Transmission Range Signal A
C2 (Red)	64	DK GRN	Fuel Tank Pressure Sensor Signal
C2 (Red)	65	—	Not Used
C2 (Red)	66	PPL/WHT	Ignition Control No. 8
C2 (Red)	67	RED/WHT	Ignition Control No. 2
C2 (Red)	68	DK GRN	Ignition Control No. 5
C2 (Red)	69	LT BLU	Ignition Control No. 3
C2 (Red)	70-75	—	Not Used
C2 (Red)	76	LT GRN/WHT	IAC Coil B High
C2 (Red)	77	LT GRN/BLK	IAC Coil B Low
C2 (Red)	78	LT BLU/BLK	IAC Coil A Low
C2 (Red)	79	LT BLU/WHT	IAC Coil A High
C2 (Red)	80	—	Not Used
(1) (Scheme 2)

(1)	(Scheme 2)

POWERTRAIN CONTROL MODULE (PCM) - 4.8L, 5.3L & 6.0L (1)

POWERTRAIN CONTROL MODULE (PCM) - 5.0L & 5.7L ("C" & "K" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4-6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Sensor Ground
C1 (Blue)	9	PPL	Fuel Level Output
C1 (Blue)	10	TAN/BLK	TCC Solenoid Control
C1 (Blue)	11 & 12	—	Not Used
C1 (Blue)	13	WHT	3-2 Shift Solenoid Control
C1 (Blue)	14	BRN	AIR Pump Relay Control
C1 (Blue)	15	YEL/BLK	VSS Output
C1 (Blue)	16-18	—	Not Used
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	PPL	HO2S Bank 2 Sensor 2 High (Under 8600 GVW); HO2S Bank 1 Sensor 2 High (Over 8600 GVW)
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 2 Sensor 2 High (Over 8600 GVW); HO2S Bank 1 Sensor 2 High (Under 8600 GVW)
C1 (Blue)	23	—	Not Used
C1 (Blue)	24	TAN	HO2S Bank 2 Sensor 2 Low (Under 8600 GVW); HO2S Bank 1 Sensor 2 Low (Over 8600 GVW)
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN/WHT	HO2S Bank 2 Sensor 2 Low (Over 8600 GVW); HO2S Bank 1 Sensor 2 Low (Under 8600 GVW)
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Sensor Ground
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS High
C1 (Blue)	31	YEL	CKP Sensor 4x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Control
C2 (Red)	7	BRN	TCC PWM Solenoid Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	DK BLU/WHT	Fuel Injector No. 8 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	12	RED/BLK	Fuel Injector No. 7 Control
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	16	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Input
C2 (Red)	20	—	Not Used
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	DK GRN	Fuel Tank Pressure Sensor Signal
C2 (Red)	26	—	Not Used
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC Coil B Low
C2 (Red)	30	LT BLU/BLK	IAC Coil A Low
C2 (Red)	31	LT BLU/BLK	Fuel Injector No. 4 Control
C2 (Red)	32	PNK/BLK	Fuel Injector No. 3 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	Sensor Ground
C3 (Clear)	5	—	Not Used
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid High
C3 (Clear)	7	DK BLU/WHT	Transmission Input Shaft Speed Sensor Low
C3 (Clear)	8	RED/BLK	Transmission Input Shaft Speed Sensor High
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Input
C3 (Clear)	12	GRY	Sensor Reference Voltage
C3 (Clear)	13	PPL/WHT	Fuel Level Sensor Signal
C3 (Clear)	14	DK BLU	A/C Recirculation Signal
C3 (Clear)	15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Low
C3 (Clear)	17	BLK/WHT	PCM Ground
C3 (Clear)	18	BLK/WHT	PCM Ground
C3 (Clear)	19	BLK	Sensor Ground
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Input
C3 (Clear)	23	PNK	Transmission Range A Input
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	DK GRN/WHT	A/C Request Signal
C3 (Clear)	26	—	Not Used
C3 (Clear)	27	GRY	Sensor Reference Voltage
C3 (Clear)	28 & 29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Cycling Switch Signal
C3 (Clear)	31 & 32	—	Not Used
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2	—	Not Used
C4 (Black)	3	DK GRN/WHT	VSS Output
C4 (Black)	4	DK GRN	VSS Output
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6	—	Not Used
C4 (Black)	7	DK GRN	Recirculation Door Motor Control
C4 (Black)	8	—	Not Used
C4 (Black)	9	DK BLU	Auxiliary Fan
C4 (Black)	10	PPL	Brake Switch Input
C4 (Black)	11	PPL	Serial Data (Class II)
C4 (Black)	12	BLK	Dual Fuel Module Return
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14	—	Not Used
C4 (Black)	15	TAN/BLK	Shift Light (M/T)
C4 (Black)	16	RED	EGR Valve Control
C4 (Black)	17	—	Not Used
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	BLK/WHT	4WD Wheel Lock Input
C4 (Black)	20	WHT	EGR Valve Ground
C4 (Black)	21	—	Not Used
C4 (Black)	22	BRN/WHT	Clutch Pedal Position Switch Signal (M/T)
C4 (Black)	23	GRY/BLK	4WD Indicator Signal Input
C4 (Black)	24	LT BLU/BLK	Cruise Engaged Input
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 5.0L & 5.7L ("C" & "K" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 5.0L & 5.7L ("G" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4-6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Sensor Ground
C1 (Blue)	9	PPL	Fuel Level Output
C1 (Blue)	10	TAN/BLK	TCC Solenoid Control
C1 (Blue)	11 & 12	—	Not Used
C1 (Blue)	13	WHT	3-2 Shift Solenoid Control
C1 (Blue)	14	—	Not Used
C1 (Blue)	15	YEL/BLK	VSS Output
C1 (Blue)	16-18	—	Not Used
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	PPL	HO2S Bank 1 Sensor 3 High (5.0L); HO2S Bank 1 Sensor 2 High (5.7L)
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 2 Sensor 2 High (5.7L)
C1 (Blue)	23	—	Not Used
C1 (Blue)	24	TAN	HO2S Bank 1 Sensor 3 Low (5.0L); HO2S Bank 1 Sensor 2 Low (5.7L)
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN/WHT	HO2S Bank 2 Sensor 2 Low (5.7L)
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Sensor Ground
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS High
C1 (Blue)	31	YEL	CKP Sensor 4x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Control
C2 (Red)	7	BRN	TCC PWM Solenoid Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	DK BLU/WHT	Fuel Injector No. 8 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	12	RED/BLK	Fuel Injector No. 7 Control
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	16	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Input
C2 (Red)	20	—	Not Used
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	DK GRN	Fuel Tank Pressure Sensor Signal
C2 (Red)	26	—	Not Used
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC Coil B Low
C2 (Red)	30	LT BLU/BLK	IAC Coil A Low
C2 (Red)	31	LT BLU/BLK	Fuel Injector No. 4 Control
C2 (Red)	32	PNK/BLK	Fuel Injector No. 3 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	Sensor Ground
C3 (Clear)	5	—	Not Used
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid High
C3 (Clear)	7	DK BLU/WHT	Transmission Input Shaft Speed Sensor Low
C3 (Clear)	8	RED/BLK	Transmission Input Shaft Speed Sensor High
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Input
C3 (Clear)	12	GRY	Sensor Reference Voltage
C3 (Clear)	13	PPL/WHT	Fuel Level Sensor Signal
C3 (Clear)	14 & 15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Low
C3 (Clear)	17	BLK/WHT	PCM Ground
C3 (Clear)	18	BLK/WHT	PCM Ground
C3 (Clear)	19	BLK	Sensor Ground
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Input
C3 (Clear)	23	PNK	Transmission Range A Input
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	DK GRN/WHT	A/C Request Signal
C3 (Clear)	26	—	Not Used
C3 (Clear)	27	GRY	Sensor Reference Voltage
C3 (Clear)	28 & 29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Cycling Switch Signal
C3 (Clear)	31 & 32	—	Not Used
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2	—	Not Used
C4 (Black)	3	DK GRN/WHT	VSS Output
C4 (Black)	4	DK GRN	VSS Output
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6-9	—	Not Used
C4 (Black)	10	PPL	Brake Switch Input
C4 (Black)	11	PPL	Serial Data (Class II)
C4 (Black)	12	—	Not Used
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14 & 15	—	Not Used
C4 (Black)	16	RED	EGR Valve Control
C4 (Black)	17	—	Not Used
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	—	Not Used
C4 (Black)	20	WHT	EGR Valve Ground
C4 (Black)	21-23	—	Not Used
C4 (Black)	24	LT BLU/BLK	Cruise Engaged Input
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 5.0L & 5.7L ("G" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 5.7L ("P" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4	PNK	Ignition Voltage
C1 (Blue)	5 & 6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Sensor Ground
C1 (Blue)	9	PPL	Fuel Level Signal Output
C1 (Blue)	10-13	—	Not Used
C1 (Blue)	14	BRN	AIR Relay Control (Calif. Only)
C1 (Blue)	15	YEL/BLK	VSS Output
C1 (Blue)	16-18	—	Not Used
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	PPL	HO2S Bank 1 Sensor 2 High
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 2 Sensor 2 High
C1 (Blue)	23	—	Not Used
C1 (Blue)	24	TAN	HO2S Bank 1 Sensor 2 Low
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN/WHT	HO2S Bank 2 Sensor 2 Low
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Sensor Ground
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS High
C1 (Blue)	31	YEL	CKP Sensor 4x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Control
C2 (Red)	7	BRN	TCC PWM Solenoid Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	DK BLU/WHT	Fuel Injector No. 6 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	12	RED/BLK	Fuel Injector No. 7 Control
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	16	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Signal
C2 (Red)	20	—	Not Used
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	DK GRN	Fuel Tank Vacuum Sensor Signal
C2 (Red)	26	—	Not Used
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC Coil B Low
C2 (Red)	30	LT BLU/BLK	IAC Coil A Low
C2 (Red)	31	LT BLU/BLK	Fuel Injector No. 4 Control
C2 (Red)	32	PNK/BLK	Fuel Injector No. 3 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	ECT/TP Sensor Ground
C3 (Clear)	5	—	Not Used
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid High
C3 (Clear)	7	DK BLU/WHT	Input Shaft Speed Sensor Low
C3 (Clear)	8	RED/WHT	Input Shaft Speed Sensor High
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Input
C3 (Clear)	12	GRY	TP Sensor Reference Voltage
C3 (Clear)	13	PPL	Fuel Level Module (Single Tank)
C3 (Clear)	14 & 15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Low
C3 (Clear)	17	BLK/WHT	VCM Ground
C3 (Clear)	18	BLK/WHT	VCM Ground
C3 (Clear)	19	BLK	Sensor Ground (EGR/IAT/MAP)
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Input
C3 (Clear)	23	PNK	Transmission Range A Input
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	DK GRN/WHT	A/C Request Signal
C3 (Clear)	26	—	Not Used
C3 (Clear)	27	GRY	Reference Voltage (EGR/MAP)
C3 (Clear)	28 & 29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Compressor Cycling Switch Signal
C3 (Clear)	31 & 32	—	Not Used
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2 & 3	—	Not Used
C4 (Black)	4	DK GRN	VSS Output Signal (Speedometer)
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6-9	—	Not Used
C4 (Black)	10	PPL	Brake Signal
C4 (Black)	11	PPL	Serial Data (Class II)
C4 (Black)	12	—	Not Used
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14 & 15	—	Not Used
C4 (Black)	16	RED	EGR Valve Feed
C4 (Black)	17	—	Not Used
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	—	Not Used
C4 (Black)	20	WHT	EGR Valve Control
C4 (Black)	21-24	—	Not Used
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 5.7L ("P" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 6.5L ("C" & "K" SERIES)

Connector	Terminal	Wire Color	Function
C1 (Brown)	C1	—	Not Used
C1 (Brown)	C2	DK GRN/WHT	A/C Request Signal
C1 (Brown)	C3	YEL	Mass Airflow Signal
C1 (Brown)	C4	TAN	Intake Air Temperature Signal
C1 (Brown)	C5	LT BLU	Accelerator Pedal Position 2 Signal
C1 (Brown)	C6	YEL	Glow Plug Relay Control
C1 (Brown)	C7	RED/BLK	Pressure Control Solenoid Valve High
C1 (Brown)	C8	YEL	Fuel Temperature Signal
C1 (Brown)	C9	YEL/BLK	Transmission Fluid Temperature Sensor
C1 (Brown)	C10	—	Not Used
C1 (Brown)	C11	YEL	Engine Coolant Temperature Signal
C1 (Brown)	C12	GRY/BLK	EGR Control Pressure/BARO Signal
C1 (Brown)	C13	RED	Closure Signal
C1 (Brown)	C14	LT GRN	Boost Sensor Signal
C1 (Brown)	C15	LT BLU/WHT	Pressure Control Solenoid Valve Low
C1 (Brown)	C16	—	Not Used
C1 (Brown)	D1	BLU/WHT	Transmission Input Speed Signal Low
C1 (Brown)	D2	GRY/BLK	4WD Front Wheel Lock Signal
C1 (Brown)	D3	YEL/BLK	Accelerator Pedal Position 3 Reference Voltage
C1 (Brown)	D4	DK GRN	Accelerator Pedal Position 3 Signal
C1 (Brown)	D5	GRY	Fuel Lift Pump Signal
C1 (Brown)	D6	GRY	Accelerator Pedal Position 3 Ground
C1 (Brown)	D7	BRN	Glow Plug Signal
C1 (Brown)	D8	DK GRN/WHT	Fuel Lift Pump Control
C1 (Brown)	D9	PNK/BLK	Sensor Ground (Pump CAM, High Res. & Fuel Temp.)
C1 (Brown)	D10	GRY/BLK	Cruise Resume/Accel Signal
C1 (Brown)	D11	RED/BLK	Transmission Input Speed Signal High
C1 (Brown)	D12	WHT/BLK	Accelerator Pedal Position 1 Reference Voltage
C1 (Brown)	D13	GRY	Sensor Reference Voltage (Boost, CKP & EGR)
C1 (Brown)	D14	GRY	Sensor Reference Voltage (Pump CAM & High Res.)
C1 (Brown)	D15 & D16	—	Not Used
C2 (Brown)	A1	BLK	Closure Ground
C2 (Brown)	A2	ORG	High Res. Signal
C2 (Brown)	A3	BRN	Transmission Input Speed Signal
C2 (Brown)	A4	BRN/WHT	Pump CAM Sensor Signal
C2 (Brown)	A5	YEL	CKP Sensor Signal
C2 (Brown)	A6	DK GRN	Vehicle Speed Sensor Signal
C2 (Brown)	A7	RED/BLK	Injection Timing Stepper Motor High Coil 1
C2 (Brown)	A8	TAN/BLK	Injection Timing Stepper Motor Low Coil 1
C2 (Brown)	A9	ORG/BLK	Injection Timing Stepper Motor Low Coil 2
C2 (Brown)	A10	YEL/BLK	Injection Timing Stepper Motor High Coil 2
C2 (Brown)	A11	GRY	Cruise Control On/Off Signal
C2 (Brown)	A12	PPL	Accelerator Pedal Position 2 Ground
C2 (Brown)	B1	BRN	Accelerator Pedal Position 1 Ground
C2 (Brown)	B2	DK BLU	Accelerator Pedal Position 1 Signal
C2 (Brown)	B3	BLK/WHT	4WD Low Indicator Signal
C2 (Brown)	B4	RED	Transmission Range Switch C Input
C2 (Brown)	B5	DK BLU	Transmission Range Switch B Input
C2 (Brown)	B6	PNK	Transmission Range Switch A Input
C2 (Brown)	B7 & B8	—	Not Used
C2 (Brown)	B9	PPL (A/T)	Cruise Control Brake Switch Signal (A/T)
C2 (Brown)	B9	BRN/WHT (M/T)	Brake/Clutch Pedal Position Switch Signal (M/T)
C2 (Brown)	B10	WHT	Brake Switch Signal
C2 (Brown)	B11	DK BLU	Cruise Set/Coast Signal
C2 (Brown)	B12	BLK	Sensor Ground (Boost, EGR, ECT, IAT, Fuel Temp., TFT & CKP)
C3 (Blue)	C1	—	Not Used
C3 (Blue)	C2	TAN	Accelerator Pedal Position 2 Reference Voltage
C3 (Blue)	C3	LT GRN	Fuel Injection Control
C3 (Blue)	C4	LT GRN	1-2 Shift Solenoid Signal
C3 (Blue)	C5	BRN	TCC PWM Solenoid Signal
C3 (Blue)	C6	YEL/BLK	2-3 Shift Solenoid Signal
C3 (Blue)	C7	DK BLU	Wait To Start Light Control
C3 (Blue)	C8	PPL	Class II Communication
C3 (Blue)	C9 & C10	—	Not Used
C3 (Blue)	C11	PNK	Ignition Voltage
C3 (Blue)	C12	PNK	Ignition Voltage
C3 (Blue)	C13	ORG	Battery Voltage
C3 (Blue)	C14	BRN/WHT	MIL Control
C3 (Blue)	C15	DK BLU/WHT	Engine Shutoff Control
C3 (Blue)	C16	GRY	EGR Solenoid Control
C3 (Blue)	D1 & D2	—	Not Used
C3 (Blue)	D3	LT GRN/BLK	Fuel Injection Control
C3 (Blue)	D4	—	Not Used
C3 (Blue)	D5	DK GRN/WHT	A/C Enable Signal
C3 (Blue)	D6	BLK/WHT	PCM Ground
C3 (Blue)	D7	TAN/WHT	PCM Ground
C3 (Blue)	D8-D10	—	Not Used
C3 (Blue)	D11	WHT/BLK	Service Throttle Soon Light Control
C3 (Blue)	D12	WHT	EGR Vent Control
C3 (Blue)	D13	ORG	Battery Voltage
C3 (Blue)	D14	YEL	Wastegate Solenoid Control
C3 (Blue)	D15	DK BLU/WHT	Engine Shutoff Solenoid Control
C3 (Blue)	D16	—	Not Used
(1) (Scheme 4)

(1)	(Scheme 4)

POWERTRAIN CONTROL MODULE (PCM) - 6.5L ("C" & "K" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 6.5L ("G" SERIES)

Connector	Terminal	Wire Color	Function
C1 (Brown)	C1	—	Not Used
C1 (Brown)	C2	DK GRN/WHT	A/C Request Signal
C1 (Brown)	C3	YEL	Mass Airflow Signal
C1 (Brown)	C4	TAN	Intake Air Temperature Signal
C1 (Brown)	C5	LT BLU	Accelerator Pedal Position 2 Signal
C1 (Brown)	C6	YEL	Glow Plug Relay Control
C1 (Brown)	C7	RED/BLK	Pressure Control Solenoid Valve High
C1 (Brown)	C8	YEL	Fuel Temperature Signal
C1 (Brown)	C9	YEL/BLK	Transmission Fluid Temperature Sensor
C1 (Brown)	C10	—	Not Used
C1 (Brown)	C11	YEL	Engine Coolant Temperature Signal
C1 (Brown)	C12	GRY/BLK	EGR Control Pressure/BARO Signal
C1 (Brown)	C13	RED	Closure Signal
C1 (Brown)	C14	LT GRN	Boost Sensor Signal
C1 (Brown)	C15	LT BLU/WHT	Pressure Control Solenoid Valve Low
C1 (Brown)	C16	—	Not Used
C1 (Brown)	D1	BLU/WHT	Transmission Input Speed Signal Low
C1 (Brown)	D2	GRY/BLK	4WD Low Indicator Signal
C1 (Brown)	D3	YEL/BLK	Accelerator Pedal Position 3 Reference Voltage
C1 (Brown)	D4	DK GRN	Accelerator Pedal Position 3 Signal
C1 (Brown)	D5	GRY	Fuel Lift Pump Signal
C1 (Brown)	D6	GRY	Accelerator Pedal Position 3 Ground
C1 (Brown)	D7	LT BLU	Glow Plug Signal
C1 (Brown)	D8	DK GRN/WHT	Fuel Lift Pump Control
C1 (Brown)	D9	PNK/BLK	Sensor Ground (Pump CAM, High Res. & Fuel Temp.)
C1 (Brown)	D10	GRY/BLK	Cruise Resume/Accel Signal
C1 (Brown)	D11	RED/BLK	Transmission Input Speed Signal High
C1 (Brown)	D12	WHT/BLK	Accelerator Pedal Position 1 Reference Voltage
C1 (Brown)	D13	GRY	Sensor Reference Voltage (Boost & CKP)
C1 (Brown)	D14	GRY	Sensor Reference Voltage (Pump CAM & High Res.)
C1 (Brown)	D15 & D16	—	Not Used
C2 (Brown)	A1	BLK	Closure Ground
C2 (Brown)	A2	ORG	High Res. Signal
C2 (Brown)	A3	BRN	Transmission Output Speed Signal
C2 (Brown)	A4	BRN/WHT	Pump CAM Sensor Signal
C2 (Brown)	A5	YEL	CKP Sensor Signal
C2 (Brown)	A6	DK GRN	Vehicle Speed Sensor Signal
C2 (Brown)	A7	RED/BLK	Injection Timing Stepper Motor High
C2 (Brown)	A8	TAN/BLK	Injection Timing Stepper Motor Low
C2 (Brown)	A9	ORG/BLK	Injection Timing Stepper Motor Low
C2 (Brown)	A10	YEL/BLK	Injection Timing Stepper Motor High
C2 (Brown)	A11	GRY	Cruise Control On/Off Signal
C2 (Brown)	A12	PPL	Accelerator Pedal Position 2 Ground
C2 (Brown)	B1	BRN	Accelerator Pedal Position 1 Ground
C2 (Brown)	B2	DK BLU	Accelerator Pedal Position 1 Signal
C2 (Brown)	B3	BLK/WHT	Front Axle Switch Signal
C2 (Brown)	B4	RED	Transmission Range Switch C Input
C2 (Brown)	B5	DK BLU	Transmission Range Switch B Input
C2 (Brown)	B6	PNK	Transmission Range Switch A Input
C2 (Brown)	B7 & B8	—	Not Used
C2 (Brown)	B9	PPL	Brake Switch Signal
C2 (Brown)	B10	WHT	Brake Switch Signal
C2 (Brown)	B11	DK BLU	Cruise Set/Coast Signal
C2 (Brown)	B12	BLK	Sensor Ground (Boost, ECT, IAT & TFT)
C3 (Blue)	C1	—	Not Used
C3 (Blue)	C2	TAN	Accelerator Pedal Position 2 Signal
C3 (Blue)	C3	LT GRN	Fuel Injection Control
C3 (Blue)	C4	LT GRN	1-2 Shift Solenoid Signal
C3 (Blue)	C5	BRN	TCC PWM Solenoid Signal
C3 (Blue)	C6	YEL/BLK	1-2 Shift Solenoid Signal
C3 (Blue)	C7	DK BLU	Wait To Start Light Control
C3 (Blue)	C8	PPL	Class 2 Communication
C3 (Blue)	C9 & C10	—	Not Used
C3 (Blue)	C11	PNK	Ignition Voltage
C3 (Blue)	C12	PNK	Ignition Voltage
C3 (Blue)	C13	ORG	Battery Voltage
C3 (Blue)	C14	BRN/WHT	MIL Control
C3 (Blue)	C15	DK BLU/WHT	Engine Shutoff Control
C3 (Blue)	C16	—	Not Used
C3 (Blue)	D1 & D2	—	Not Used
C3 (Blue)	D3	LT GRN	Fuel Injection Control
C3 (Blue)	D4	—	Not Used
C3 (Blue)	D5	DK GRN/WHT	A/C Enable Signal
C3 (Blue)	D6	BLK/WHT	PCM Ground
C3 (Blue)	D7	TAN/WHT	PCM Ground
C3 (Blue)	D8-D10	—	Not Used
C3 (Blue)	D11	WHT/BLK	Service Throttle Soon Light Control
C3 (Blue)	D12	—	Not Used
C3 (Blue)	D13	ORG	Battery Voltage
C3 (Blue)	D14	YEL	Wastegate Solenoid Control
C3 (Blue)	D15	DK BLU/WHT	Engine Shutoff Solenoid Control
C3 (Blue)	D16	—	Not Used
(1) (Scheme 4)

(1)	(Scheme 4)

POWERTRAIN CONTROL MODULE (PCM) - 6.5L ("G" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 6.5L ("P" SERIES)

Connector	Terminal	Wire Color	Function
C1 (Brown)	C1	PPL	Crankshaft Position Sensor Ground
C1 (Brown)	C2	DK GRN/WHT	A/C Request Signal
C1 (Brown)	C3	—	Not Used
C1 (Brown)	C4	TAN	Intake Air Temperature Signal
C1 (Brown)	C5	LT BLU	Accelerator Pedal Position 2 Signal
C1 (Brown)	C6	YEL	Glow Plug Relay Control
C1 (Brown)	C7	RED/BLK	Pressure Control Solenoid Valve High
C1 (Brown)	C8	YEL	Fuel Temperature Signal
C1 (Brown)	C9	YEL/BLK	Transmission Fluid Temperature Sensor Signal
C1 (Brown)	C10	—	Not Used
C1 (Brown)	C11	YEL	Engine Coolant Temperature Signal
C1 (Brown)	C12	—	Not Used
C1 (Brown)	C13	RED	Closure Signal
C1 (Brown)	C14	LT GRN	Boost Sensor Signal
C1 (Brown)	C15	LT BLU/WHT	Pressure Control Solenoid Valve Low
C1 (Brown)	C16	—	Not Used
C1 (Brown)	D1	BLU/WHT	Transmission Input Speed Signal Low
C1 (Brown)	D2	—	Not Used
C1 (Brown)	D3	YEL/BLK	Accelerator Pedal Position 3 Reference Voltage
C1 (Brown)	D4	DK GRN	Accelerator Pedal Position 3 Signal
C1 (Brown)	D5	GRY	Fuel Lift Pump Signal
C1 (Brown)	D6	GRY	Accelerator Pedal Position 3 Ground
C1 (Brown)	D7	BRN	Glow Plug Signal
C1 (Brown)	D8	DK GRN/WHT	Fuel Pump Relay Control
C1 (Brown)	D9	PNK/BLK	Sensor Ground (Pump CAM, High Res. & Fuel Temp.)
C1 (Brown)	D10	GRY/BLK	Cruise Control Resume/Accel Signal
C1 (Brown)	D11	RED/BLK	Transmission Input Speed Signal High
C1 (Brown)	D12	WHT/BLK	Accelerator Pedal Position 1 Reference Voltage
C1 (Brown)	D13	GRY	Sensor Reference Voltage (Boost & CKP)
C1 (Brown)	D14	GRY	Sensor Reference Voltage (Pump CAM & High Res.)
C1 (Brown)	D15 & D16	—	Not Used
C2 (Brown)	A1	BLK	Closure Ground
C2 (Brown)	A2	ORG	High Res. Signal
C2 (Brown)	A3	BRN	Transmission Output Speed Signal
C2 (Brown)	A4	BRN/WHT	Pump CAM Sensor Signal
C2 (Brown)	A5	YEL	CKP Sensor Signal
C2 (Brown)	A6	DK GRN/WHT	Vehicle Speed Sensor Signal
C2 (Brown)	A7	RED/BLK	Injection Timing Stepper Motor High Coil 1
C2 (Brown)	A8	TAN/BLK	Injection Timing Stepper Motor Low Coil 1
C2 (Brown)	A9	ORG/BLK	Injection Timing Stepper Motor Low Coil 2
C2 (Brown)	A10	YEL/BLK	Injection Timing Stepper Motor High Coil 2
C2 (Brown)	A11	GRY	Cruise Control On/Off Signal
C2 (Brown)	A12	PPL	Accelerator Pedal Position 2 Ground
C2 (Brown)	B1	BRN	Accelerator Pedal Position 1 Ground
C2 (Brown)	B2	DK BLU	Accelerator Pedal Position 1 Signal
C2 (Brown)	B3	—	Not Used
C2 (Brown)	B4	RED	Transmission Range Switch C Input
C2 (Brown)	B5	DK BLU	Transmission Range Switch B Input
C2 (Brown)	B6	PNK	Transmission Range Switch A Input
C2 (Brown)	B7 & B8	—	Not Used
C2 (Brown)	B9	PPL	TCC/ABS Brake Switch Signal
C2 (Brown)	B10	LT BLU	Brakelight Switch Signal
C2 (Brown)	B11	DK BLU	Cruise Set/Coast Signal
C2 (Brown)	B12	BLK	Sensor Ground (Boost, ECT, IAT & TFT)
C3 (Blue)	C1	—	Not Used
C3 (Blue)	C2	TAN	Accelerator Pedal Position 2 Reference Voltage
C3 (Blue)	C3	LT GRN	Fuel Injection Control
C3 (Blue)	C4	LT GRN	1-2 Shift Solenoid Signal
C3 (Blue)	C5	BRN	TCC PWM Solenoid
C3 (Blue)	C6	YEL/BLK	2-3 Shift Solenoid Signal
C3 (Blue)	C7	DK BLU	Wait To Start Light Control
C3 (Blue)	C8	PPL	Class II Communication
C3 (Blue)	C9 & C10	—	Not Used
C3 (Blue)	C11	PNK	Ignition Voltage
C3 (Blue)	C12	PNK	Ignition Voltage
C3 (Blue)	C13	ORG	Battery Voltage
C3 (Blue)	C14	BRN/WHT	MIL Control
C3 (Blue)	C15	DK BLU/WHT	Engine Shutoff Control
C3 (Blue)	C16	—	Not Used
C3 (Blue)	D1-D4	—	Not Used
C3 (Blue)	D5	DK GRN/WHT	A/C Enable Signal
C3 (Blue)	D6	BLK/WHT	PCM Ground
C3 (Blue)	D7	BLK/WHT	PCM Ground
C3 (Blue)	D8-D10	—	Not Used
C3 (Blue)	D11	WHT/BLK	Service Throttle Soon Light Control
C3 (Blue)	D12	—	Not Used
C3 (Blue)	D13	ORG	Battery Voltage
C3 (Blue)	D14	YEL	Wastegate Solenoid Control
C3 (Blue)	D15 & D16	—	Not Used
(1) (Scheme 4)

(1)	(Scheme 4)

POWERTRAIN CONTROL MODULE (PCM) - 6.5L ("P" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 7.4L ("C" & "K" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4-6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Low
C1 (Blue)	9	PPL	Fuel Gauge
C1 (Blue)	10-13	—	Not Used
C1 (Blue)	14	BRN	AIR Relay Control (Calif. Only)
C1 (Blue)	15	YEL/BLK	VSS Signal
C1 (Blue)	16 & 17	—	Not Used
C1 (Blue)	18	PPL/WHT	Dual Tank Fuel Module
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	PPL	HO2S Bank 1 Sensor 2 High
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 2 Sensor 2 High
C1 (Blue)	23	—	Not Used
C1 (Blue)	24	TAN	HO2S Bank 1 Sensor 2 Low
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN/WHT	HO2S Bank 2 Sensor 2 Low
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Low
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS Signal
C1 (Blue)	31	YEL	CKP Sensor 4x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Control
C2 (Red)	7	BRN	TCC PWM Solenoid Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	DK BLU/WHT	Fuel Injector No. 8 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	12	RED/BLK	Fuel Injector No. 7 Control
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	16	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Signal
C2 (Red)	20	—	Not Used
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	DK GRN	Fuel Tank Vacuum Sensor Signal
C2 (Red)	26	—	Not Used
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC High
C2 (Red)	30	LT BLU/BLK	IAC Low
C2 (Red)	31	LT BLU/BLK	Fuel Injector No. 4 Control
C2 (Red)	32	PNK/BLK	Fuel Injector No. 3 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	ECT/TP Sensor Ground
C3 (Clear)	5	—	Not Used
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid High
C3 (Clear)	7	DK BLU/WHT	Input Shaft Speed Sensor Low
C3 (Clear)	8	RED/BLK	Input Shaft Speed Sensor High
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Input
C3 (Clear)	12	GRY	TP Sensor Reference Voltage
C3 (Clear)	13	PPL/WHT	Fuel Level Signal
C3 (Clear)	14	DK BLU	A/C Recirculation
C3 (Clear)	15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Low
C3 (Clear)	17	BLK/WHT	PCM Ground
C3 (Clear)	18	BLK/WHT	PCM Ground
C3 (Clear)	19	BLK	Sensor Ground (IAT/MAP/EGR)
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Input
C3 (Clear)	23	PNK	Transmission Range A Input
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	DK GRN/WHT	A/C Request Signal
C3 (Clear)	26	—	Not Used
C3 (Clear)	27	GRY	Reference Voltage (EGR/MAP)
C3 (Clear)	28 & 29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Compressor Cycling Switch Signal
C3 (Clear)	31 & 32	—	Not Used
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2	—	Not Used
C4 (Black)	3	DK GRN/WHT	VSS Output Signal (TCC/Radio/Cruise Control)
C4 (Black)	4	DK GRN	VSS Output Signal (Speedometer)
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6-9	—	Not Used
C4 (Black)	10	PPL	Brake Signal
C4 (Black)	11	PPL	Serial Data (Class II)
C4 (Black)	12	BLK	Dual Fuel Module Return
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14 & 15	—	Not Used
C4 (Black)	16	RED	EGR Valve Feed
C4 (Black)	17	—	Not Used
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	—	Not Used
C4 (Black)	20	WHT	EGR Valve Control
C4 (Black)	21 & 23	—	Not Used
C4 (Black)	24	LT BLU/BLK	Cruise Engaged Signal
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 7.4L ("C" & "K" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 7.4L ("G" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4-6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Low
C1 (Blue)	9	PPL	Fuel Gauge
C1 (Blue)	10-13	—	Not Used
C1 (Blue)	14	BRN	AIR Relay Control (Calif. Only)
C1 (Blue)	15	YEL/BLK	VSS Signal
C1 (Blue)	16 & 17	—	Not Used
C1 (Blue)	18	PPL/WHT	Dual Tank Fuel Module
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	PPL/WHT	HO2S Bank 2 Sensor 2 High
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 1 Sensor 2 High
C1 (Blue)	23	—	Not Used
C1 (Blue)	24	TAN/WHT	HO2S Bank 2 Sensor 2 Low
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN	HO2S Bank 1 Sensor 2 Low
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Low
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS Signal
C1 (Blue)	31	YEL	CKP Sensor 4x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1	—	Not Used
C2 (Red)	2	WHT	EVAP Canister Vent Solenoid Control
C2 (Red)	3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Control
C2 (Red)	7	BRN	TCC PWM Solenoid Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	DK BLU/WHT	Fuel Injector No. 8 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	12	RED/BLK	Fuel Injector No. 7 Control
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	16	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Signal
C2 (Red)	20	—	Not Used
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25	DK GRN	Fuel Tank Vacuum Sensor Signal
C2 (Red)	26	—	Not Used
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC High
C2 (Red)	30	LT BLU/BLK	IAC Low
C2 (Red)	31	LT BLU/BLK	Fuel Injector No. 4 Control
C2 (Red)	32	PNK/BLK	Fuel Injector No. 3 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	ECT/TP Sensor Ground
C3 (Clear)	5	—	Not Used
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid High
C3 (Clear)	7	DK BLU/WHT	Input Shaft Speed Sensor Low
C3 (Clear)	8	RED/BLK	Input Shaft Speed Sensor High
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Input
C3 (Clear)	12	GRY	TP Sensor Reference Voltage
C3 (Clear)	13	PPL/WHT	Fuel Level Module (Single Tank)
C3 (Clear)	14	DK BLU	A/C Recirculation
C3 (Clear)	15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Low
C3 (Clear)	17	BLK/WHT	PCM Ground
C3 (Clear)	18	BLK/WHT	PCM Ground
C3 (Clear)	19	BLK	Sensor Ground (IAT/MAP/EGR)
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Input
C3 (Clear)	23	PNK	Transmission Range A Input
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	DK GRN/WHT	A/C Request Signal
C3 (Clear)	26	—	Not Used
C3 (Clear)	27	GRY	Reference Voltage (EGR/MAP)
C3 (Clear)	28 & 29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Compressor Cycling Switch Signal
C3 (Clear)	31 & 32	—	Not Used
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2	—	Not Used
C4 (Black)	3	DK GRN/WHT	VSS Output Signal (TCC/Radio/Cruise Control)
C4 (Black)	4	DK GRN	VSS Output Signal (Speedometer)
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6	—	Not Used
C4 (Black)	7	DL GRN	Inlet Air Actuator
C4 (Black)	8	—	Not Used
C4 (Black)	9	DL BLU	Auxiliary Electric Cooling Fan
C4 (Black)	10	PPL	Brake Signal
C4 (Black)	11	PPL	Serial Data (Class II)
C4 (Black)	12	BLK	Dual Fuel Module Return
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14 & 15	—	Not Used
C4 (Black)	16	RED	EGR Valve Feed
C4 (Black)	17	—	Not Used
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	BLK/WHT	4WD Engaged Signal
C4 (Black)	20	WHT	EGR Valve Control
C4 (Black)	21 & 22	—	Not Used
C4 (Black)	23	GRY/BLK	Transfer Case High Low Switch
C4 (Black)	24	LT BLU/BLK	Cruise Engaged Signal
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 7.4L ("G" SERIES) (1)

POWERTRAIN CONTROL MODULE (PCM) - 7.4L ("P" SERIES)

Connector	Terminal No.	Wire Color	Function
C1 (Blue)	1 & 2	—	Not Used
C1 (Blue)	3	BRN/WHT	CMP Sensor 1x Signal
C1 (Blue)	4-6	—	Not Used
C1 (Blue)	7	TAN	HO2S Bank 2 Sensor 1 Low
C1 (Blue)	8	PNK/BLK	CMP Low
C1 (Blue)	9	PPL	Fuel Gauge
C1 (Blue)	10-13	—	Not Used
C1 (Blue)	14	BRN	AIR Relay Control (Calif. Only)
C1 (Blue)	15	YEL/BLK	VSS Signal
C1 (Blue)	16 & 17	—	Not Used
C1 (Blue)	18	PPL/WHT	Dual Tank Fuel Module
C1 (Blue)	19	PPL/WHT	HO2S Bank 1 Sensor 1 High
C1 (Blue)	20	PPL	HO2S Bank 1 Sensor 2 High
C1 (Blue)	21	PPL	HO2S Bank 2 Sensor 1 High
C1 (Blue)	22	PPL/WHT	HO2S Bank 2 Sensor 2 High
C1 (Blue)	23	—	Not Used
C1 (Blue)	24	TAN	HO2S Bank 1 Sensor 2 Low
C1 (Blue)	25	TAN/WHT	HO2S Bank 1 Sensor 1 Low
C1 (Blue)	26	TAN/WHT	HO2S Bank 2 Sensor 2 Low
C1 (Blue)	27	—	Not Used
C1 (Blue)	28	PPL	CKP Low
C1 (Blue)	29	LT GRN/BLK	VSS Low
C1 (Blue)	30	PPL/WHT	VSS Signal
C1 (Blue)	31	YEL	CKP Sensor 4x Signal
C1 (Blue)	32	—	Not Used
C2 (Red)	1-3	—	Not Used
C2 (Red)	4	YEL/BLK	2-3 Shift Solenoid Control
C2 (Red)	5	—	Not Used
C2 (Red)	6	LT GRN	1-2 Shift Solenoid Control
C2 (Red)	7	BRN	TCC PWM Solenoid Control
C2 (Red)	8	BLK	Fuel Injector No. 1 Control
C2 (Red)	9	DK BLU/WHT	Fuel Injector No. 8 Control
C2 (Red)	10	BRN	EGR Pintle Position Signal
C2 (Red)	11	LT GRN/BLK	Fuel Injector No. 2 Control
C2 (Red)	12	RED/BLK	Fuel Injector No. 7 Control
C2 (Red)	13	LT GRN/WHT	IAC Coil B High
C2 (Red)	14	LT BLU/WHT	IAC Coil A High
C2 (Red)	15	BLK/WHT	Fuel Injector No. 5 Control
C2 (Red)	16	YEL/BLK	Fuel Injector No. 6 Control
C2 (Red)	17 & 18	—	Not Used
C2 (Red)	19	DK BLU	KS Signal
C2 (Red)	20	—	Not Used
C2 (Red)	21	LT GRN	MAP Sensor Signal
C2 (Red)	22	TAN	IAT Sensor Signal
C2 (Red)	23	YEL	ECT Sensor Signal
C2 (Red)	24	DK BLU	TP Sensor Signal
C2 (Red)	25 & 26	—	Not Used
C2 (Red)	27	YEL/BLK	TFT Sensor Signal
C2 (Red)	28	YEL	MAF Sensor Signal
C2 (Red)	29	LT GRN/BLK	IAC High
C2 (Red)	30	LT BLU/BLK	IAC Low
C2 (Red)	31	LT BLU/BLK	Fuel Injector No. 4 Control
C2 (Red)	32	PNK/BLK	Fuel Injector No. 3 Control
C3 (Clear)	1	DK GRN/WHT	A/C Compressor Clutch Relay Control
C3 (Clear)	2	DK GRN/WHT	EVAP Canister Purge Solenoid Control
C3 (Clear)	3	—	Not Used
C3 (Clear)	4	BLK	ECT/TP Sensor Ground
C3 (Clear)	5	—	Not Used
C3 (Clear)	6	RED/BLK	Pressure Control Solenoid High
C3 (Clear)	7	DK BLU/WHT	Input Shaft Speed Sensor Low
C3 (Clear)	8	RED/BLK	Input Shaft Speed Sensor High
C3 (Clear)	9	WHT	IC Control
C3 (Clear)	10	—	Not Used
C3 (Clear)	11	RED	Transmission Range C Input
C3 (Clear)	12	GRY	TP Sensor Reference Voltage
C3 (Clear)	13	PPL/WHT	Fuel Level Module (Single Tank)
C3 (Clear)	14	DK BLU	A/C Recirculation
C3 (Clear)	15	—	Not Used
C3 (Clear)	16	LT BLU/WHT	Pressure Control Solenoid Low
C3 (Clear)	17	BLK/WHT	PCM Ground
C3 (Clear)	18	BLK/WHT	PCM Ground
C3 (Clear)	19	BLK	Sensor Ground (EGR/IAT/MAP)
C3 (Clear)	20	—	Not Used
C3 (Clear)	21	ORG	Battery Voltage
C3 (Clear)	22	DK BLU	Transmission Range B Input
C3 (Clear)	23	PNK	Transmission Range A Input
C3 (Clear)	24	—	Not Used
C3 (Clear)	25	DK GRN/WHT	A/C Request Signal
C3 (Clear)	26	—	Not Used
C3 (Clear)	27	GRY	EGR/MAP Reference Voltage
C3 (Clear)	28 & 29	—	Not Used
C3 (Clear)	30	DK GRN	A/C Compressor Cycling Switch Signal
C3 (Clear)	31 & 32	—	Not Used
C4 (Black)	1	DK GRN/WHT	Fuel Pump Relay Control
C4 (Black)	2	—	Not Used
C4 (Black)	3	DK GRN/WHT	VSS Output Signal (TCC/Radio/Cruise Control)
C4 (Black)	4	DK GRN	VSS Output Signal (Speedometer)
C4 (Black)	5	BRN/WHT	MIL Control
C4 (Black)	6-8	—	Not Used
C4 (Black)	9	DK BLU	Auxiliary Elactric Cooling Fan
C4 (Black)	10	PPL	Brake Signal
C4 (Black)	11	PPL	Serial Data (Class II)
C4 (Black)	12	—	Not Used
C4 (Black)	13	BRN	Ignition Voltage
C4 (Black)	14 & 15	—	Not Used
C4 (Black)	16	RED	EGR Valve Feed
C4 (Black)	17	—	Not Used
C4 (Black)	18	PNK	Ignition Voltage
C4 (Black)	19	—	Not Used
C4 (Black)	20	WHT	EGR Valve Control
C4 (Black)	21-23	—	Not Used
C4 (Black)	24	LT BLU/BLK	Cruise Engaged Signal
(1) (Scheme 3)

(1)	(Scheme 3)

POWERTRAIN CONTROL MODULE (PCM) - 7.4L ("P" SERIES) (1)

ENGINE SENSORS & SWITCHES

Note. For additional sensor testing specifications, see appropriate SENSOR OPERATING RANGE CHARTS article.

Manufacturer does not provide testing procedures for many individual systems and components. For sensor and switch testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

Engine Coolant Temperature (ECT) Sensor A malfunction in ECT sensor circuit can set a related Diagnostic Trouble Code (DTC). For testing procedure, see appropriate SELF-DIAGNOSTICS article. An out-of-calibration ECT sensor may not set a DTC. Use the following procedure to test sensor calibration. Disconnect ECT sensor harness connector. Using an ohmmeter, measure resistance of ECT sensor at specified temperatures. See «ECT SENSOR RESISTANCE VALUES»(/cadillac/escalade/gmt400-1998-2000/remont/testing-diagnostics/#engine-control-system-component-tests) table. Resistance should be high when engine is cold and drop as engine warms. With vehicle sitting overnight, IAT sensor and ECT sensor should have close to the same resistance reading. If resistance is not within specification, replace ECT sensor. ECT SENSOR RESISTANCE VALUES Temperature °F (°C) Ohms 212 (100) 177 158 (70) 467 104 (40) 1459 68 (20) 3520 32 (0) 9420 5 (-15) 21,450 -40 (-40) 100,700
Intake Air Temperature (IAT) Sensor A malfunction in IAT sensor circuit can set a related Diagnostic Trouble Code (DTC). For testing procedure, see appropriate SELF-DIAGNOSTICS article. An out-of-calibration IAT sensor may not set a DTC. Use the following procedure to test sensor calibration. Disconnect IAT sensor harness connector. Using an ohmmeter, measure resistance of IAT sensor at specified temperatures. See «IAT SENSOR RESISTANCE VALUES»(/cadillac/escalade/gmt400-1998-2000/remont/testing-diagnostics/#engine-control-system-component-tests) table. Resistance should be high when air temperature is cold and drop as air temperature warms. With vehicle sitting overnight, ECT sensor and IAT sensor should have close to the same resistance reading. If resistance is not within specification, replace IAT sensor. IAT SENSOR RESISTANCE VALUES Temperature °F (°C) Ohms 212 (100) 177 158 (70) 467 104 (40) 1459 68 (20) 3520 32 (0) 9420 5 (-15) 21,450 -40 (-40) 100,700

Note. MAP sensor circuit diagnosis is only available from manufacturer for 2.2L and 3.4L engines.

MAP Sensor Circuit Diagnosis (2.2L) If On-Board Diagnostic (OBD) system check has been performed, go to next step. If On-Board Diagnostic (OBD) system check has not been performed, perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
Install scan tool and retrieve DTCs. If no MAP sensor related DTCs are set, go to next step. If any MAP sensor related DTCs are set, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
Turn ignition on with engine off. Compare MAP sensor reading with that of a known-good vehicle. If voltage readings are within 0.4 volt of each other, go to next step. If voltage readings are not within 0.4 volt of each other, go to step 5 .
Disconnect and plug vacuum source to MAP sensor. Connect a hand-held vacuum pump to vacuum source port on MAP sensor. Apply 10 in. Hg of vacuum to MAP sensor while observing MAP sensor reading on scan tool. Subtract this reading from the reading obtained in step 3) . If difference is greater than 1.5 volts, go to step 6 . If difference is not greater than 1.5 volts, go to step 7 .
Replace MAP sensor. After repairs, go to step 9 .
Check MAP sensor vacuum source for leakage or restriction, and that vacuum source only supplies MAP sensor. If problem exists, go to step 8 . If problem does not exist, go to step 9 .
Check for poor connection at MAP sensor. If poor connection does not exist, go to step 5 . If poor connection exists, repair as necessary and go to step 9 .
Repair leak or restriction in MAP sensor vacuum source as necessary. After repairs, go to next step.
Operate vehicle under conditions which original symptom was noted. If system operates properly, system is okay at this time. If system does not operate properly, go to step 2 .

MAP Sensor Circuit Diagnosis (3.4L) If On-Board Diagnostic (OBD) system check has been performed, go to next step. If On-Board Diagnostic (OBD) system check has not been performed, perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
Check for the following: Missing or damaged MAP sensor seal. Damage, disconnected or misrouted vacuum hoses. Intake manifold vacuum leaks. Vacuum leaks at throttle body. Vacuum leaks in EGR system. Faulty, missing or incorrectly installed PCV valve. If a problem does not exist, go to next step. If a problem exists, repair as necessary and go to step 14 .
Disconnect MAP sensor harness connector. Using scan tool, observe MAP sensor parameter. If zero volts is displayed, go to next step. If zero volts is not displayed, go to step 12 .
Using a test light connected to battery voltage, probe MAP sensor signal circuit (Light Green wire) at MAP sensor harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Observe MAP sensor parameter on scan tool. If 4.95 volts is displayed, go to next step. If 4.95 volts is not displayed, go to step 8 .
Using a fused jumper wire, connect MAP sensor signal circuit (Light Green wire) and MAP sensor reference voltage circuit (Gray wire) at MAP sensor harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Observe MAP sensor parameter on scan tool. If scan tool displays 4.95 volts, go to next step. If scan tool does not display 4.95 volts, go to step 7 .
Turn ignition off. Disconnect PCM harness connectors. Check MAP sensor ground circuit (Orange/Black wire) for open, high resistance or poor connection at PCMs. If problem does not exist, go to step 10 . If problem exists, repair as necessary and go to step 14 .
Check MAP sensor reference voltage circuit (Gray wire) for open, high resistance or poor connection at PCM. If problem does not exist, go to step 9 . If problem exists, repair as necessary and go to step 14 .
Turn ignition off. Disconnect PCM harness connectors. Check MAP sensor signal circuit (Light Green wire) for open, high resistance, short to ground or short to sensor. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step 14 .
Check MAP sensor signal circuit (Light Green wire) for poor connection at PCM. If problem does not exist, go to step 13 . If problem exists, repair as necessary and go to step 14 .
Check for poor connection at MAP sensor. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step 14 .
Replace MAP sensor. After repairs, go to step 14 .
Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Check MAP sensor signal circuit (Light Green) for a short to voltage or short to MAP sensor reference voltage circuit (Gray wire). If problem does not exist, go to next step. If problem exists, repair as necessary and go to step 14 .
Replace PCM. Program PCM. Perform VTD password relearn procedure and crankshaft variation learn procedure. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. After repairs, go to next step.
Start engine and let idle. While observing MAP sensor parameter on scan tool, increase engine RPM. If MAP sensor value changes, system is okay. If MAP sensor value does not change, go to step 2 .

Engine Oil Level Switch Diagnosis If On-Board Diagnostic (OBD) system check has been performed, go to next step. If On-Board Diagnostic (OBD) system check has not been performed, perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
Using scan tool, observe engine oil level display. If scan tool does not display OK, go to next step. If scan tool displays OK, check for poor connections at engine oil level switch and PCM. If poor connection exists, repair as necessary. If poor connection does not exist, perform warning light diagnosis. See «PCM CONTROLLED WARNING LIGHTS & GAUGES»(/cadillac/escalade/gmt400-1998-2000/remont/testing-diagnostics/#engine-control-system-component-tests) under MISCELLANEOUS CONTROLS.
Turn ignition off. Disconnect PCM harness connectors. Using a test light connected to battery voltage, probe engine oil level switch signal circuit (Brown wire) at PCM harness connector. If test light does not illuminate, go to next step. If test light illuminates, go to step 7 .
Ensure ignition is off. Reconnect PCM harness connectors. Turn ignition on. Raise and support vehicle. Disconnect engine oil level switch harness connector. Using DVOM, measure voltage between engine oil level switch harness connector terminals. If battery voltage does not exist, go to next step. If battery voltage exists, go to step 8 .
Using DVOM, measure voltage between chassis ground and engine oil level switch signal circuit (Brown wire) at engine oil level switch harness connector. If battery voltage does not exist, go to next step. If battery voltage exists, go to step 9 .
Check for open in engine oil level switch signal circuit (Brown wire) between engine oil level switch and PCM. If open exists, repair as necessary and go to step 12 . If open does not exist, check for poor connections at engine oil level switch and PCM. If poor connection exists, repair as necessary. If poor connection does not exist, perform warning light diagnosis. See «PCM CONTROLLED WARNING LIGHTS & GAUGES»(/cadillac/escalade/gmt400-1998-2000/remont/testing-diagnostics/#engine-control-system-component-tests) under MISCELLANEOUS CONTROLS.
Check for poor connections at PCM. If poor connection exists, repair as necessary and go to step 12 . If poor connection does not exist, go to step 11 .
Check for poor connections at engine oil level switch. If poor connection exists, repair as necessary and go to step 12 . If poor connection does not exist, go to step 10 .
Locate and repair open in engine oil level switch ground circuit (Black/White wire). After repairs, go to step 12 .
Replace engine oil level switch. After repairs, go to step 12 .
Replace PCM. Program PCM. Perform VTD password relearn procedure and crankshaft variation learn procedure. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. After repairs, go to next step.
Start engine and allow to warm to normal operating temperature. Turn ignition off. Allow engine to cool for 15 minutes. Turn ignition on. Using scan tool, observe engine oil level display. If scan tool displays OK, system is okay. If scan tool does not display OK, go to step 3 .

MODULES, MOTORS, RELAYS & SOLENOIDS

Note. Manufacturer does not provide testing procedures for many individual systems and components. For module, motor, relay and solenoid testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

A/C Compressor Clutch Relay

See appropriate MANUAL A/C-HEATER SYSTEMS or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

Fuel Pump Relay

Fuel pump relay is located in underhood fuse/relay block. To test fuel pump relay, see FUEL SYSTEM ELECTRICAL CIRCUIT under appropriate NO START - ENGINE CRANKS OKAY in appropriate BASIC DIAGNOSTIC PROCEDURES article.

EVAP Canister Purge Solenoid

See FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS (GASOLINE).

Idle Air Control (IAC) Valve

See IDLE AIR CONTROL (IAC) SYSTEM DIAGNOSIS under IDLE CONTROL SYSTEM.

Torque Converter Clutch (TCC) Solenoid

See TRANSMISSION under MISCELLANEOUS CONTROLS.

FUEL SYSTEM (GASOLINE)

Note. For fuel system pressure testing, see appropriate BASIC DIAGNOSTIC PROCEDURES article.

Manufacturer does not provide testing procedures for many individual systems and component. For fuel system testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

Fuel Pressure Regulator (CSI)

Fuel pressure regulator is a vacuum-controlled diaphragm type, which uses manifold vacuum to modify fuel pressure to compensate for engine load fuel requirements. Connect fuel pressure gauge to fuel pressure service port. Start engine and note fuel pressure. Disconnect vacuum hose from fuel pressure regulator. Fuel pressure should increase 4-10 psi (.28-.70 kg/cm 2 ). If pressure does not increase 4-10 psi (.28-.70 kg/cm 2 ), check for presence of manifold vacuum at signal line. If vacuum is not present, check for kinked, cut or split vacuum hose or plugged throttle body vacuum port. If vacuum is present and no pressure change occurs, replace fuel pressure regulator.

Fuel Pressure Regulator (SFI)

Fuel pressure regulator is mechanically controlled by internal spring pressure. Regulator is adjusted at factory and is not serviceable. If fuel pressure is too low, check for restricted delivery line. Also, check fuel pump pressure and volume. If fuel pressure is too high, check for restricted fuel tank return line or fuel filter. If no faults are found and pressure is too high or too low, replace fuel pressure regulator.

Fuel Pump Oil Pressure Switch (Back-Up Circuit)

To test fuel pump oil pressure switch (fuel pump back-up circuit), start engine. With engine running, disconnect fuel pump relay. If engine stalls, fuel pump oil pressure switch is faulty. If vehicle continues to run, switch is okay.

FUEL CONTROL

Note. Retrieve DTCs and perform appropriate DTC test before performing FUEL INJECTOR CIRCUIT DIAGNOSIS. See appropriate SELF-DIAGNOSTICS article. Also, ensure all mechanical and ignition coil/module circuit malfunctions are repaired before performing fuel injector circuit diagnosis.

Fuel Injector Circuit Diagnosis (Except 2.2L & 3.4L)

Note. Fuel injector circuit diagnosis test information for 2.2L and 3.4L engines is not available from manufacturer.

If On-Board Diagnostic (OBD) system check has been performed, go to next step. If On-Board Diagnostic (OBD) system check has not been performed, perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
Disconnect fuel injector harness connectors at intake manifold. Using a test light connected to ground, probe appropriate injector ignition feed circuits at fuel injector harness connector. Turn ignition on with engine off. If test light illuminates on both circuits, go to step 6 . If test light does not illuminate on both circuits, go to next step.
If test light illuminates on only one injector ignition feed circuit, go to step 5 . If test light does not illuminate on only one injector ignition feed circuit, go to next step.
Check injector fuse. If fuse is blown, go to step 10 . If fuse is okay, go to step 11 .
Check for an open in appropriate injector feed circuit between PCM/VCM and injector harness connector. If open exists, go to step 12 .
Connect Fuel Injector Test Light (J-34730-380) to fuel injector harness connectors (PCM/VCM side) one at a time. Crank engine while observing test light. If test light does not flash at each injector, go to next step. If test light flashes at each injector, perform injector coil test. See «INJECTOR COIL TEST (EXCEPT 2.2L & 3.4L)»(/cadillac/escalade/gmt400-1998-2000/remont/testing-diagnostics/#engine-control-system-component-tests__injector-coil-test-except-22l) .
If fuel injector test light illuminates constantly while engine is being cranked, go to next step. If fuel injector test light does not illuminate constantly while engine is being cranked, go to step 9 .
Install fuel injector test light on affected circuit. Turn ignition off. Disconnect PCM/VCM harness connectors. Turn ignition on with engine off. If test light illuminates, go to step 13 . If test light does not illuminate, go to step 16 .
Check for an open in injector control circuit between PCM/VCM and injector harness connectors. If open exists, go to step 12 . If an open does not exist, go to step 14 .
Check for a short to ground in injector ignition feed circuit between PCM/VCM and injector harness connectors. If a short to ground exists, go to step 12 .
Repair open or short to ground on both injector ignition feed circuits. After repairs, go to step 17 .
Repair circuit as necessary. After repairs, go to step 17 .
Repair short to ground in injector control circuit between PCM/VCM and injector harness connectors. After repairs, go to step 17 .
Check PCM/VCM harness connectors for poor connections. If poor connection exists, go to next step. If poor connection does not exist, go to step 16 .
Repair terminal contact as necessary. After repairs, go to step 17 .
Replace PCM/VCM. Program PCM/VCM. Perform VTD password relearn procedure and crankshaft variation learn procedure. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. After repairs, go to step 17 .
Using scan tool, clear DTCs. Attempt to start engine. If engine starts and continues to run, go to next step. If engine does not start and continue to run, go to step 2 .
Let engine idle until normal operating temperature is reached. Retrieve DTCs. If no DTCs are set, system is okay. If any DTCs are set, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.

Injector Balance Test (Except 2.2L & 3.4L)

Note. Allow engine to cool down to avoid irregular reading due to "hot soak" fuel boiling. To prevent flooding, the fuel injector balance test should not be performed more than once without starting and running engine.

Note. If injectors are dirty, they should be cleaned using approved injector cleaning procedure before performing fuel injector balance test.

If On-Board Diagnostic (OBD) system check has been performed, go to next step. If On-Board Diagnostic (OBD) system check has not been performed, perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
If engine coolant temperature is greater than 201°F (94°C), go to next step. If engine coolant temperature is less than 201°F (94°C), go to step 4 .
Allow engine to cool to less than 201°F (94°C). After engine cools to less than 201°F (94°C), go to next step.
Turn ignition off. Relieve fuel pressure. Install fuel pressure gauge. Turn ignition on with engine off. Install scan tool. Using scan tool, energize fuel pump. Place fuel pressure gauge bleed hose into container. Bleed air out of fuel pressure gauge. Using scan tool, energize fuel pump again. Wait for fuel pressure to build. Observe fuel pressure while fuel pump is running. If fuel pressure reading is 60-66 psi (4.2-4.6 kg/cm 2 ) on 4.3L, 5.0L and 5.7L, or 55-62 psi (4.0-4.4 kg/cm 2 ) on 4.8L, 5.3L, 6.0L and 7.4L, go to next step. If fuel pressure reading is not within specification, perform fuel system diagnosis. See appropriate BASIC DIAGNOSTIC PROCEDURES article.
After fuel pump stops, fuel pressure should slightly decrease. If fuel pressure remains constant within 55-60 psi (4.0-4.2 kg/cm 2 ) on 4.3L, 5.0L and 5.7L, or 48-52 psi (3.4-3.7 kg/cm 2 ) on 4.8L, 5.3L, 6.0L and 7.4L, go to next step. If fuel pressure reading is not within specification, perform fuel system diagnosis. See appropriate BASIC DIAGNOSTIC PROCEDURES article.
Turn ignition off. Turn ignition on with engine off. Using scan tool, select SPECIAL FUNCTIONS. Select FUEL SYSTEMS, and then INJECTOR BALANCE TEST. Select injector to be tested. Press enter, this will prime fuel pump. After fuel pressure stabilizes, record fuel pressure reading on fuel pressure gauge (first reading). Energize injector by depressing PULSE INJECTOR button on scan tool. Injector will be energized and fuel pressure will decrease. Record fuel pressure reading after fuel pressure stabilizes (second reading). Press enter on scan tool to return to SELECT INJECTOR. Repeat procedure for each injector. Subtract first reading from second reading for each injector (this result is pressure drop value). Add pressure drop value for each injector together and divide total by total number of injectors. If any injector's drop value is greater or less than average drop value by 1.5 psi, replace faulty injector(s) as necessary. If no injector's drop value is greater or less than average drop value by 1.5 psi, perform injector coil test. See «INJECTOR COIL TEST (EXCEPT 2.2L & 3.4L)»(/cadillac/escalade/gmt400-1998-2000/remont/testing-diagnostics/#engine-control-system-component-tests__injector-coil-test-except-22l) .

Injector Balance Test (2.2L & 3.4L)

Note. If injectors are dirty, they should be cleaned using approved injector cleaning procedure before performing fuel injector balance test.

If On-Board Diagnostic (OBD) system check has been performed, go to next step. If On-Board Diagnostic (OBD) system check has not been performed, perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
If injector coil test has been performed, go to next step. If injector coil test has not been performed, go to appropriate INJECTOR COIL TEST - ECT BETWEEN 50-95°F.
If engine coolant temperature is greater than 201°F (94°C), go to next step. If engine coolant temperature is less than 201°F (94°C), go to step 5 .
Allow engine to cool to less than 201°F (94°C). After engine cools to less than 201°F (94°C), go to next step.
Install fuel pressure gauge. Using scan tool, energize fuel pump. Place fuel pressure gauge bleed hose into container. Bleed air out of fuel pressure gauge. Using scan tool, energize fuel pump again. Wait for fuel pressure to build. Observe fuel pressure. If fuel pressure reading is 41-47 psi (2.9-3.3 kg/cm 2 ), go to next step. If fuel pressure reading is not within specification, perform fuel system diagnosis. See appropriate BASIC DIAGNOSTIC PROCEDURES article.
Turn fuel pump off. Observe fuel pressure gauge. If fuel pressure remains constant, go to next step. If fuel system does not remain constant, perform fuel system diagnosis. See appropriate BASIC DIAGNOSTIC PROCEDURES article.
Disconnect fuel injectors harness connector. Using appropriate fuel injector adapter, connect Fuel Injector Tester (J-39021) to fuel injector. Connect fuel injector tester power leads to appropriate battery terminals. Set amperage supply selector switch on fuel injector tester to Balance Test 0.5-2.5-amp position. Turn ignition on, and then off to pressurize system. Record fuel pressure reading after fuel pressure stabilizes (first reading). Energize injector by depressing PUSH TO START TEST button on injector tester and hold until fuel pressure gauge stabilizes. Record fuel pressure reading (second reading). Subtract first reading from second reading (this result is pressure drop value). Repeat procedure for each injector. Add pressure drop value for each injector together and divide total by total number of injectors. If any injector's drop value is greater or less than average drop value by 1.5 psi, replace faulty injector(s) as necessary. If no injector's drop value is greater or less than average drop value by 1.5 psi, repair by symptom. See appropriate TROUBLE SHOOTING - NO CODES article.