GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2004 🢒 Isuzu MD F-Series 🢒 Engine 🢒 Engine Controls - 7.8L 🢒 Engine Controls Component Views
Figure 1:

Accelerator Pedal Position (APP) Sensor
Object Number: 397650 Size: LF
(1)Accelerator Pedal Position (APP) Sensor
Figure 2:

Behind the Left Side of the I/P
Object Number: 1551566 Size: LF
(1)Lower I/P Harness
(2)S305 (CTF)
(3)Controller Area Network (CAN) Connector
(4)Forward Bulkhead
(5)C209 (6 cavities - Upfitter Connector - CTF /PTO)
(6)Glow Plug Relay
(7)Glow Plug Relay C2
(8)Glow Plug Relay C1
(9)Driver Grab-handle
(10)Door Harness - Left
Figure 3:

Instrument Panel Switches, Center Forward View
Object Number: 1400889 Size: LF
(1)Outside Heated Mirror Switch (DNN)
(2)High Idle Switch (UF3) or Power Take-Off (PTO) Switch
(3)Exhaust Brake Switch (K40)
(4)Rear Axle Driver Control Switch - Two Speed (HPZ and Automatic Transmission)
(5)Traction Control Switch (NW9)
(6)Overdrive (OD) Defeat Switch (Allison® LCT)
(7)Marker Lamp Switch (JE4, RQ2 and U86, or JE4 and RQ3)
Figure 4:

Right Side of the Engine (LG4)
Object Number: 228805 Size: LF
(1)Engine Harness
(2)Generator Fuse
(3)Generator
(4)A/C Compressor Clutch (C60)
(5)A/C Compressor (C60)
(6)Engine Oil Pressure (EOP) Sensor
Figure 5:

Outboard Right Frame Rail, Forward of the Batteries
Object Number: 1498773 Size: LF
(1)Right Frame Rail
(2)Air Intake Elbow
(3)Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor
(4)Engine Harness
(5)Air Cleaner
Figure 6:

Top Center of Flywheel Housing
Object Number: 397634 Size: MF
(1)Crankshaft Position (CKP) Sensor (Allison® LCT)
Figure 7:

Fuel Senders, G400, Low Air Alarms, Splice Pack SP400 (Ground Block) - LG4/LG5


Object Number: 953488 Size: LF
(1)Fuel Sender - Primary
(2)Fuel Tank
(3)Low Air Pressure Switch - Primary
(4)Low Air Pressure Switch - Secondary
(5)Splice Pack SP400 (Ground Block - 6 cavities)
(6)Fuel Sender - Secondary Connector
(7)Ground G400
(8)Fuel Sender - Secondary
(9)Fuel Tank - Secondary
Figure 8:

Fuel Tank Harness, Left Side
Object Number: 628248 Size: LF
(1)Fuel Sending Unit Connector
(2)Fuel Tank Sender
(3)Fuel Transfer Pump Connector
(4)Fuel Transfer Pump
(5)Back of Cab Crossmember
(6)Fuel Tank Harness
(7)C411
(8)Rear Chassis Harness
Figure 9:

Top of Engine, Front, Under Valve Cover
Object Number: 1507904 Size: LF
(1)Fuel Injector 1
(2)Fuel Injector 2
(3)C122 (8 cavities)
(4)Fuel Injector 3
(5)Glow Plug 3
(6)Glow Plug Bus 2
(7)Fuel Injector Harness Connector Adapter 1 (C122)
(8)Glow Plug 2
(9)Glow Plug Bus 1
(10)Glow Plug 1
Figure 10:

Top of Engine, Rear, Under Valve Cover
Object Number: 1507905 Size: LF
(1)Fuel Injector 4
(2)C123 (8 cavities)
(3)Fuel Injector 5
(4)Fuel Injector 6
(5)Glow Plug 6
(6)Glow Plug Bus 2
(7)Glow Plug 5
(8)Fuel Injector Harness Connector Adapter 2 (C123)
(9)Glow Plug 4
(10)Glow Plug Bus 1
Figure 11:

Left Rear Engine View
Object Number: 397647 Size: LF
(1)Fuel Injector Connector C123 - to the fuel injector harness connector adapter 2
(2)Glow Plug 5
(3)Fuel Temperature Sensor
(4)Glow Plug 6
Figure 12:

Left Side Engine View
Object Number: 397631 Size: MF
(1)Engine Coolant Temperature Gage Sensor
(2)Fuel Pressure Sensor
(3)Pressure Control Valve 1
(4)Pressure Control Valve 2
(5)Injection Pump Speed Sensor