LeeBoy 8608 - Page 156

Maintenance
LeeBoy 8608 Commercial Paver5-64
Check ECU Powering UpCheck ECU Powering Up
Relays
7A 30
SCR HT RLY Coil + ACU Main PWR
8A 20
Main RLY PWR
9A 5
ECU RLY Coil +
10A 5
ECU RLY PWR
10E 30
B+ to Key 30 PWR
9E
5
Main RLY PWR
8E 5
Main RLY Coil +
7E 30
Main RLY PWR
10C 10
Nox/DEF Sensors PWR
9C
Start ECU + RLY Coil
5
Fuses
Figure 5-68. Power Distribution Box (PDB)
Each engine has a power distribution block (PDB) on
the main engine harness that provides power to the ECU
through the ECU control relay, main relay and fuses.
(Figure 5-68)
To check the ECU powering up:
1. Locate the PDB on the right side of the paver inside
the engine access door.
2. Fuses can be checked by removing the fuse and
using a continuity tester OR checking for +12VDC on
each pin on the back of the fuse.
3. Conrm operation of ECU and main relays:
• If the ECU relay is not energizing, starter will not
operate.
• If the main relay is not energizing, the fuel pump
will not operate.
If none of these procedures correct the problem,
contact your authorized LeeBoy dealer for assistance.