249
M4.8-1055-039
03 Rev. 10/09
ELECTRICAL
Event Code 303
Event Code 303
ACCESS 3 Voltage out of range.
An under or over voltage condition has been detected
by ACCESS 3.
Step 1: Unplug battery, measure and record voltage
between +BV and BNEG of battery connector. Plug in
battery and key up truck. Proceed to Calibration menu
(C3.4) and adjust as near as possible to recorded truck
voltage. Re-key the truck.
• If: Event clears.
– Then return truck to service.
• If: Event does not clear.
– Then proceed to Step 2.
Step 2: Check voltage between +BV and BNEG power
connections at ACCESS 3, with key on and operator
present.
Note: Voltage at these terminals will be:
1. The same as recorded in Step 1, if the key input is
present at CA403-3 and the line contactor is closed.
2. Approximately two Vdc less than the voltage re-
corded in Step 1, if the line contactor power circuit is
open and the key input is present at CA403-3.
3. Steadily dropping toward 0 Vdc, if the key input is not
present at CA403-3. It takes approximately 10 minutes
for the voltage to drop to 0 Vdc.
• If: 35 to 38 Vdc.
– Then replace ACCESS 3.
• If: 32 to 34 Vdc.
– Then check (FU1), line contactor tip condition
and power cable connections between battery
connector and ACCESS 3. Repair/replace as
necessary.
• If: Voltage is slowly decreasing.
– Then proceed to Step 4.
• If: 0 Vdc.
– Then proceed to Step 3.
Step 3: 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 4.
• If: 0 Vdc.
– Then issue exists in BNEG power circuit.
Step 4: Check key switch input voltage (+) at
ACCESS 3 (CA403-3). Use BNEG power connection
on ACCESS 3 as reference.
• If: 35 to 38 Vdc.
– Then replace ACCESS 3.
• If: Less than 35 Vdc.
– Then proceed to Step 5.
Step 5: Verify the proper battery is installed and
charged.
• If: Improper battery/low battery charge.
– Then replace battery/charge battery.
• If: Proper battery is installed and charged.
– Then issue exists in key circuit. Check for open
circuit between FU3, Key, K1 relay tips, FU5
and CA403-3.
Figure 15750
Crown 2007 PF15665-39 Rev. 10/09
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