ELECTRICAL
Event Code 749
294
M4.8-1055-084
03 Rev. 10/09
Event Code 749
ACCESS 3 (Master) Startup Miscommunication.
This event code occurs at startup when the ACCESS 7
retrieves identification.
Step 1: Verify input voltage to ACCESS 3 during event
at +BV and BNEG.
• If: 35-38 Vdc and stable during event.
– Then proceed to Step 2.
Step 2: Check CAN wiring by following event code
733.
• If: CAN wiring is bad.
– Then repair CAN network.
• If: CAN wiring is correct.
– Then proceed to Step 3.
Step 3: Check for additional event codes.
• If: Only Event code 749 occurs.
– Then replace ACCESS 3.
• If: Event code 749 occurs with 748, 750 or 751
codes.
– Then replace ACCESS 7.
Event Code 750
ACCESS 3 (Slave) Startup Miscommunication.
This event code occurs at startup when the ACCESS 7
retrieves identification.
Step 1: Verify input voltage to ACCESS 3 during event
at +BV and BNEG.
• If: 35-38 Vdc and stable during event.
– Then proceed to Step 2.
• If: Not 35-38 Vdc and stable.
– Then repair power circuit to ACCESS 2.
Step 2: Check CAN wiring by following event code
733.
• If: CAN wiring is bad.
– Then repair CAN network.
• If: CAN wiring is correct.
– Then proceed to Step 3.
Step 3: Check for additional event codes.
• If: Only Event code 750 occurs.
– Then replace ACCESS 3.
• If: Event code 750 occurs with 748, 749 or 751
codes.
– Then replace ACCESS 7.
Crown 2007 PF15665-84 Rev. 10/09
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