Engine Controls Component Views. GMC Truck GMC Suburban

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC Suburban - 4WD 🢒 Engine 🢒 Engine Controls - 7.4L 🢒 Engine Controls Component Views

Figure 1:

Underhood Fuse/Relay Center


(1)	AUX B
(2)	AUX A
(3)	AUX B (30 amp)
(4)	Lighting (50 amp)
(5)	AUX A (30 amp)
(6)	Battery (50 amp)
(7)	Spare (10 amp)
(8)	Fuse Puller
(9)	Spare (20 amp)
(10)	Spare (30 amp)
(11)	Ignition A (40 amp)
(12)	ECM B (20 amp)
(13)	Horn (20 amp)
(14)	Air conditioning (10 amp)
(15)	Ignition B (50 amp)
(16)	Rear defog (30 amp)
(17)	Aux fan (30 amp)
(18)	ABS (60 amp)
(19)	Ignition E (20 amp)
(20)	ECM 1 (20 amp)
(21)	Engine 1 (20 amp)
(22)	Blower (50 amp)
(23)	Spare (10 amp)
(24)	Stop/Hazard (30 amp)
(25)	Spare (10 amp)
(26)	Diode 1
(27)	Diode 2
(28)	Horn relay
(29)	Fuel pump relay
(30)	A/C relay
(31)	A.I.R. relay
(32)	Spare
(33)	Brake lamp relay

Figure 2:

Data Link Connector (DLC)


(1)	Data Link Connector (DLC)

Figure 3:

Vehicle Speed Sensor (4WD)


(1)	Vehicle Speed Sensor (VSS)
(2)	Transfer case

Figure 4:

Vehicle Speed Sensor (4L80E)


(1)	Vehicle Speed Sensor (VSS)

Figure 5:

Fuel Filter


(1)	Fuel Filter

Figure 6:

Auxliary Fuel Tank (Dual Tank)


(1)	Tail Lamp, LH
(2)	Rear Lamp Extension Harness
(3)	Balance Pump
(4)	Fuel Sender
(5)	Fuel Sender connector
(6)	Fuel Tank, Rear

Figure 7:

Fuel Tank Pressure Sensor and Fuel Tank Sender Assembly (Utility side tank)


(1)	Fuel Tank Pressure Sensor
(2)	Fuel Tank Sender Assembly

Figure 8:

Fuel Tank Pressure Sensor and Fuel Tank Sender Assembly (Pick-up side tank)


(1)	Fuel Tank Pressure Sensor

Figure 9:

Fuel Tank Pressure Sensor and Fuel Tank Sender Assembly (rear tank)


(1)	Fuel Tank Sender Assembly
(2)	Fuel Tank Pressure Sensor

Figure 10:

Idle Air Control (IAC) and Throttle Position (TP) Sensor


(1)	Idle Air Control (IAC) Valve
(2)	Throttle Position (TP) Sensor
(3)	Engine Coolant Temperature (ECT) Sensor
(4)	Manifold Absolute Pressure (MAP) Sensor
(5)	Accelerator Control Cable

Figure 11:

Idle Air Control, Manifold Absolute Pressure, Engine Coolant Temperature, Throttle Position Sensors


(1)	Idle Air Control (IAC) Valve Motor
(2)	Engine Coolant Temperature (ECT) Sensor
(3)	Manifold Absolute Pressure (MAP) Sensor
(4)	Crankshaft Position (CKP) Sensor
(5)	Throttle Position (TP) Sensor

Figure 12:

Knock Sensors


(1)	Knock Sensor (left side)
(2)	Knock Sensor (right side)

Figure 13:

Ignition Control Module,Camshaft Position Sensor,Knock Sensor


(1)	Ignition Control Module
(2)	Camshaft Position Sensor
(3)	Engine Oil Pressure Switch

Figure 14:

Intake Air Temperature, Mass Air Flow Sensors


(1)	Intake Air Temperature (IAT) Sensor
(2)	Mass Air Flow (MAF) Sensor

Figure 15:

Canister Purge, Linear EGR, Knock Sensor


(1)	Linear Exhaust Gas Recirculation (EGR) Valve
(2)	Canister Purge Valve Solenoid

Figure 16:

EVAP Canister, EVAP Vent Valve


(1)	Evap Canister Vent Valve
(2)	Evap Canister

Figure 17:

VCM, Auxiliary Electric Cooling Fan, Underhood Electrical Center


(1)	Auxiliary Electric Cooling Fan Relay
(2)	Underhood Electrical Center
(3)	Vehicle Control Module (VCM)

Figure 18:

Heated Oxygen Sensors


(1)	HO2S Bank 2 Sensor 2
(2)	HO2S Bank 1 Sensor 2
(3)	HO2S Bank 1 Sensor 1
(4)	HO2S Bank 2 Sensor 1

Figure 19:

Air Injection Reaction (AIR) Pump


(1)	Air Injection Reaction (AIR) Pump

Figure 20:

Auxillary Cooling Fan


(1)	Auxillary Cooling Fan