GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC P42 Commercial Chassis 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Engine Controls Component Views
Figure 1:

Overhead Engine View
Object Number: 234977 Size: MF
(1)Fuel Injection Pump
(2)Boost/BARO Sensor
(3)Intake Manifold
(4)Fuel Feed Inlet Hose
(5)Fuel Manager/Filter
Figure 2:

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 3:

Glow Plugs
Object Number: 192951 Size: MF
(1)Glow Plugs
(2)Cylinder Head
Figure 4:

Injection Nozzles
Object Number: 192965 Size: MF
(1)Cylinder Head
(2)Injection Nozzles
(3)Seal
Figure 5:

Oil Pressure Switch (OPS)
Object Number: 192947 Size: LF
(1)Oil Pressure Switch (OPS)
(2)Engine Block
Figure 6:

Fuel Injection Pump and Lines
Object Number: 192955 Size: MF
(1)Optical/Fuel Temperature Sensor
(2)Fuel Injection Pump
(3)Fuel Solenoid
(4)Injection Lines
(5)Fuel Solenoid Driver
(6)Engine Shut Off (ESO) Solenoid
Figure 7:

ECT Sensor, ITS Motor, and Optical/Fuel Temperature Sensor
Object Number: 192956 Size: LF
(1)ECT Sensor
(2)Fuel Injection Pump
(3)Ignition Timing Stepper (ITS) Motor
(4)Fuel Solenoid
(5)Optical/Fuel Temperature Sensor
Figure 8:

Crankshaft Position (CKP) Sensor
Object Number: 192948 Size: SF
(1)Front Engine Cover
(2)Crankshaft Position (CKP) Sensor
(3)Mounting Bolt
Figure 9:

IAT Sensor
Object Number: 192959 Size: MF
(1)Intake Air Temperature (IAT) Sensor
(2)Intake Manifold
Figure 10:

Glow Plug Relay and Wastegate Solenoid
Object Number: 234987 Size: SF
(1)Wastegate Solenoid
(2)Intake Manifold
(3)Glow Plug Relay
Figure 11:

Fuel Filter/Manager and Fuel Injection Pump
Object Number: 192944 Size: MF
(1)Fuel Injection Pump
(2)Intake Manifold
(3)Water in Fuel Sensor
(4)Fuel Heater
(5)Fuel Filter/Manager (Filter Inside)
Figure 12:

Air Cleaner
Object Number: 234978 Size: LF
(1)Turbocharger to Elbow Duct
(2)Elbow Connector
(3)Air Cleaner (Element Inside)
(4)Air Cleaner Connector Duct
(5)Turbocharger
Figure 13:

PCM
Object Number: 234982 Size: MF
(1)Directional Signal Switch Connector
(2)Steering Column
(3)Parking Brake Support Brace
(4)Dimmer Switch
(5)ALDL Connector
(6)PCM
Figure 14:

APP Module
Object Number: 192941 Size: SF
(1)APP Module
(2)Accelerator Pedal
(3)Brake Pedal
Figure 15:

Fuel Lift Pump
Object Number: 235899 Size: SF
(1)Fuel Line
(2)Crossmember
(3)Fuel Lift Punp
(4)Right Frame Rail
Figure 16:

Fuel Tank and Sender
Object Number: 192975 Size: MF
(1)Frame Rail
(2)Fuel Lines
(3)Ground
(4)Fuel Tank (Typical)
(5)Fuel Sender