DTC 60 is Display Communication Fault

if truck operation is normal even when code is present
possible causes are:
faulty main harness, faulty display unit or faulty logic unit

- disconnect connector CN3 of controller, disconnect connector CN8 of display unit.
- check continuity between CN3-14 and CN8(149)
- check continuity between CN3-16 and CN8(150)
- check continuity between CN3-23(140) and CN8(152)
- check continuity between CN4-13(4) and CN8(151)
if you have continuity (not shorted) then replace display unit
if you have continuity (shorted) then repair or replace harness

if none of the above solves the problem or you find no problem then replace logic unit.

if truck operation is inhibited when code is present
possible causes are:
faulty logic unit

hope this helps
good luck