ELECTRICAL
Event Code 723
276
M4.8-1055-066
03 Rev. 10/09
Event Code 723
CAN Communication Time Out between ACCESS 7
and ACCESS 3.
Lost CAN communication between ACCESS 7 and
ACCESS 3.
Step 1: Check for other event codes and investigate
them first.
• If: No other event codes.
– Then proceed to Step 2.
Step 2: Verify ACCESS 3 remains powered at time of
code.
• If: ACCESS 3 not powered.
– Then trace/repair power supply wiring to
CA403-3(+) and BNEG.
• If: ACCESS 3 remains powered.
– Then proceed to step 3.
Step 3: Key OFF truck and check CAN high and low
lines with DVOM for proper resistance at harness
CA401-1 and CA401-6, should be approximately 60
ohm.
• If: 0 ohm.
– Then a short exists between CAN high and
CAN low. Check wiring and repair.
• If: 60 ohm.
– Then CAN line is correct, replace ACCESS 3 if
code continues.
• If: Greater than 60 ohm.
– Then check wiring for open or bad connection.
If OK, replace ACCESS 3.
Figure 16079
Crown 2007 PF15665-66 Rev. 10/09
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