ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
CAT DATA LINK CIRCUIT TEST - CONTINUED
N OT E
This bypass directly connects circuit for
engine start switch to ECM. ECM will
remain powered until connection to
unswitched battery line + is discon-
nected. Remove 20-Amp fuse from
inline fuse holder to power down ECM.
DO NOT connect bypass to battery
posts without first removing 20-Amp
inline fuse or DO NOT remove bypass
from battery posts without first remov-
ing 20-Amp inline fuse.
Expected Results. MSD is operating correctly.
If MSD is operating properly, there is problem in wiring. Inspect wiring and fuses (WP 0210 00) to con-
nector. Repair or replace wiring harness in question (WP 0169 00 thru WP 0175 00) or batteries (WP 0077
00), as required. Verify repair eliminates problem.
If MSD is NOT operating properly, verify 20-Amp fuse in bypass harness is NOT open. If fuse is open,
replace it and repeat this test. If fuse is OK, proceed to step 6.
Change MSD components.
If another 924G Wheel Loader is available, connect MSD to it. Ensure same communication adapter is used.
Determine if MSD operates correctly on other engine.
If another 924G Wheel Loader is not available, find different communication adapter.
Connect MSD to data link connector. Ensure same cables are used.
If changing communication adapter allows MSD to operate properly, use this procedure:
Replace communication adapter.
Verify operation of MSD.
If changing communication adapter does not allow MSD to operate properly, connect another MSD.
If original MSD works on another engine, proceed to step 7.
If different MSD works on original engine, send faulty MSD for repairs.