GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Yukon - 4WD 🢒 Engine 🢒 Engine Electrical 🢒 Engine Controls Component Views
Figure 1:

Underhood Fuse/Relay Center
Object Number: 209017 Size: LF
(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)
Object Number: 542437 Size: MF
(1)Data Link Connector (DLC)
Figure 3:

VCM, EBCM and Underhood fuse/relay center
Object Number: 209606 Size: MF
(1)Underhood fuse/relay center
(2)Vehicle Control Module (VCM)
(3)Electronic Brake Control Module (EBCM)
Figure 4:

Vehicle Speed Sensor (4WD)
Object Number: 209620 Size: SF
(1)Vehicle Speed Sensor (VSS)
(2)Transfer case
Figure 5:

Vehicle Speed Sensor (2WD)
Object Number: 209622 Size: SF
(1)Vehicle Speed Sensor (VSS)
Figure 6:

Heated Oxygen Sensors (HO2S) 5.7L Heavy Duty
Object Number: 404297 Size: SF
(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 7:

HO2S 5.7L Light Duty
Object Number: 421443 Size: SF
(1)HO2S Bank 2 Sensor 2
(2)HO2S Bank 1 Sensor 1
(3)HO2S Bank 2 Sensor 1
(4)HO2S Bank 1 Sensor 2
Figure 8:

Heated Oxygen Sensors (HO2S) 5.0/5.7L Light Duty
Object Number: 430019 Size: MF
(1)HO2S Bank 1 Sensor 3
(2)HO2S Bank 1 Sensor 1
(3)HO2S Bank 2 Sensor 1
Figure 9:

Fuel Filter
Object Number: 542484 Size: MF
(1)Fuel Filter
Figure 10:

Fuel Balance Module and Fuel Balance Pump (dual tanks only)
Object Number: 209617 Size: SF
(1)Fuel balance pump
(2)Fuel balance pump module
Figure 11:

Fuel Tank Pressure Sensor and Fuel Tank Sender Assembly (Utility side tank)
Object Number: 209633 Size: MF
(1)Fuel Tank Pressure Sensor
(2)Fuel Tank Sender Assembly
Figure 12:

Fuel Tank Pressure Sensor and Fuel Tank Sender Assembly (Pick-up side tank)
Object Number: 404292 Size: LF
(1)Fuel Tank Pressure Sensor
Figure 13:

Fuel Tank Pressure Sensor and Fuel Tank Sender Assembly (rear tank)
Object Number: 209630 Size: MF
(1)Fuel Tank Sender Assembly
(2)Fuel Tank Pressure Sensor
Figure 14:

Purge Solenoid, Ignition Coil, Oil Pressure/Fuel Pump Switch and CMP
Object Number: 209635 Size: MF
(1)EVAP Canister Purge Solenoid
(2)Ignition Control Module
(3)Ignition Coil
(4)Oil Pressure Switch
(5)Camshaft Position Sensor (CMP)
Figure 15:

Knock Sensor and CKP
Object Number: 209638 Size: SF
(1)Knock Sensor (KS)
(2)Crankshaft Position (CKP) Sensor
Figure 16:

TP, IAC and PCV
Object Number: 209640 Size: SF
(1)Idle Air Control (IAC) Valve
(2)Positive Crankcase Ventilation (PCV) Valve
(3)Throttle Position (TP) Sensor
Figure 17:

MAP, EGR, Purge Solenoid, and Throttle Body
Object Number: 209643 Size: SF
(1)Throttle Body
(2)Exhaust Gas Recirculation (EGR) Valve
(3)Generator
(4)Evaporative Emission (EVAP) Canister Purge Valve
(5)Manifold Absolute Pressure (MAP) Sensor
Figure 18:

ECT and EGR
Object Number: 217936 Size: SF
(1)Exhaust Gas Recirculation (EGR) Valve
(2)Engine Coolant Temperature (ECT) Sensor
Figure 19:

MAF, IAT, Air Cleaner Assembly
Object Number: 209645 Size: SF
(1)Air Cleaner Assembly
(2)Intake Air Temperature (IAT)
(3)Mass Air Flow (MAF) Sensor
(4)Air Cleaner Restriction Indicator
Figure 20:

Enhanced EVAP and PCV
Object Number: 209647 Size: MF
(1)Positive Crankcase Ventilation (PCV) Valve
(2)EVAP Service Port
(3)EVAP Canister
(4)EVAP Canister Purge Solenoid
Figure 21:

AIR and EVAP
Object Number: 209648 Size: MF
(1)Electric AIR Pump
(2)AIR Valve
(3)Evaporative Emission (EVAP) Canister
(4)EVAP Canister Vent Valve