ELECTRICAL
Event Code 304
250
M4.8-1055-040
03 Rev. 10/09
Event Code 304
Low voltage on motor terminal outputs.
Step 1: Check voltage at each traction motor power
cable connection, with Key on. Use BNEG on
ACCESS 3 as reference.
• If: Less than 15 Vdc.
– Then proceed to Step 2.
• If: Greater than 20 Vdc.
– Then proceed to Step 3.
• If: 15 to 20 Vdc.
– Then proceed to Step 4.
Step 2: Verify BNEG is present at ACCESS 3 power
connection by moving positive meter lead to +BV at
battery.
• If: 35 to 38 Vdc.
– Then proceed to Step 3.
• If: 0 Vdc.
– Then issue exists in BNEG power circuit.
Step 3: Check voltage with at each traction motor out-
put (U, V & W) on ACCESS 3 with key on. Use BNEG
on ACCESS 3 as reference.
• If: Less than 15 Vdc.
– Then follow Event 303 procedures.
• If: Greater than 20 Vdc.
– Then replace ACCESS 3.
• If: 15 to 20 Vdc.
– Then proceed to Step 4.
Step 4: Verify power cables are connected correctly
between motor(s) and ACCESS 3.
• If: Cables connected correctly.
– Then proceed to Step 5.
• If: Cables incorrectly connected.
– Then repair/replace as necessary.
Step 5: Check for open traction motor(s). Remove
power cables from traction motor. Measure and record
resistance across each of the following phases (U to
V), (U to W), (V to W).
• If: Any phase is open.
– Then replace motor.
• If: Any phase is greater than 1 ohm resistance.
– Then replace the motor.
• If: All phases less than 1 ohm resistance.
– Then replace ACCESS 3.
Event Code 305
High voltage on motor terminal outputs.
Note: A common symptom for this event is the traction
fuse FU1 blowing during plugging.
Step 1: Follow Event 304 procedure.
Figure 15749-01
Crown 2007 PF15665-40 Rev. 10/09
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