TM 5-3805-294-23-1
FIELD MAINTENANCE
GLOW PLUG CHECK
INITIAL SETUP:
References (cont.)
Tools and Special Tools
Tool Kit, General Mechanic's: Automotive
Volume 3, WP 0369
(Volume 5, WP 0796, Table 2, Item 119)
Volume 3, WP 0430
Accessory Kit, MSD Electronic Equipment
Volume 3, WP 0432
(Volume 5, WP 0796, Table 2, Item 2)
Volume 3, WP 0433
Multimeter, Digital
Volume 4, WP 0504
(Volume 5, WP 0796, Table 2, Item 77)
Volume 4, WP 0508
Probe Set, Standard
Volume 4, WP 0509
(Volume 5, WP 0796, Table 2, Item 91)
Volume 4, WP 0510
Test Set, MSD Electronic Systems
Volume 4, WP 0511
(Volume 5, WP 0796, Table 2, Item 116)
Volume 4, WP 0504
Volume 4, WP 0512
Volume 4, WP 0516
Materials/Parts
Volume 4, WP 0518
Wire, Jumper
Volume 4, WP 0519
(Volume 5, WP 0792)
Volume 4, WP 0566
Volume 4, WP 0589
Personnel Required
Volume 4, WP 0593
Construction Equipment Repairer 91L (2)
Volume 4, WP 0614
Volume 5, WP 0800
References
TM 5-3805-294-10 (Volume 5, WP 0794)
Equipment Condition
Volume 3, WP 0312
Machine safely parked and shut down (TM
Volume 3, WP 0362
5-3805-294-10). (Volume 5, WP 0794)
Volume 3, WP 0363
Test Equipment Setup for MSD and Service
Volume 3, WP 0365
ADVISOR. (Volume 3, WP 0375)
Related Information
Glow plugs are electric heating elements located in the combustion chamber of each cylinder. Glow plugs are
installed in a threaded hole in the cylinder head.
A relay controlled by the ECU provides the voltage supply to the parallel-connected glow plugs. The glow plugs are
internally grounded to the cylinder head.
The ECU supplies a high side output to the glow plug relay coil to energize the relay. The ECU monitors the output
of the relay to determine if the relay is energized.
The ECU will generate DTC 676.05 if the glow plug relay is detected as not being energized when commanded and
DTC 675.03 if the glow plug relay is energized when not commanded.
The ECU uses fuel temperature to determine if the glow plug relay should be energized.
An engine preheat indicator, controlled by the ECU, is displayed on the monitor to signal the operator to not crank
the engine until the ECU has completed the preheating cycle.
0129-1