4-31
Copyright 2017 Cummins Inc.
TABLE 4-21. LOW FUEL −DAY WARNING (240)
WARNING
Many troubleshooting procedures present hazards that can result in severe personal inju-
ry or death. Only qualified service personnel with knowledge of fuels, electricity, and machinery haz-
ards should perform service procedures. Review Important Safety Instructions page.
Indicator(s) Possible Cause Corrective Action
“LOW FUEL−
DAY”
warning
message (240)
Fuel level is
normal.
DS1 on the
engine
interface
board, A31,
is on.
DS1 on A31 is on, indicating that A31 is re-
ceiving a low fuel signal from the sender.
The sender, the harness or the A31 circuit
board could be bad.
If the fuel level is normal, isolate the source of the low
fuel signal.
Disconnect the signal lead at the sender and reset
the control.
1. If the 240 message drops out and does not re-
appear, replace the sender.
*2. If the 240 message reappears and remains af-
ter control reset, disconnect J4/A31 and check
continuity from P4−14 to GND.
If there is continuity, replace the harness.
If there is no continuity, replace circuit
board A31.
DS1 on A31 is off, indicating that the PCC is
not receiving a low fuel signal from the
sender—but the 240 message indicates
that A32, the digital board, is responding to
a false low fuel signal.
A31, the engine interface board, or A32, the
digital board, could be bad.
If the fuel level is normal, isolate the source of the low
fuel signal.
*1. Install a breakout connector at A32 J4.
2. Open the J4-15 circuit and reset the control.
If the fault drops out and does not return,
replace A31.
If the fault returns after resetting the con-
trol, go to step 3.
*3. Install harness tool between A32 J2/P2.
4. Open the J2-19 circuit and reset the control.
If the fault drops out and does not return,
replace A31.
If the fault returns after resetting the con-
trol, replace A32.
“LOW FUEL−
DAY”
warning
message (240)
Fuel level is
normal.
DS1 (A31)
and DS13
(A34) are off.
*CAUTION: Wearing a wrist strap, set S12 to Off and A32 S5 to Standby before connecting/disconnecting harness plugs.
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