D21 18
White
1
1
Engine oil level #1 low-data valid but below
normal operational range-most severe level
None
4
4
Fuel stop valve circuit-voltage below normal, or
shorted to low source
Red
7
7
Fuel stop valve-stuck at open position
White
0
0
Fuel temperature high - data valid but above
normal operational range-moderately severe
Amber
3
3
Fuel temperature sensor circuit-voltage above
normal, or shorted to high source
Fuel temperature sensor circuit-voltage below
normal, or shorted to low source
white
14
14
Auxiliary temperature sensor input #1 engine
protection- data valid but above normal
operational range- most severe level
Amber
3
3
Auxiliary temperature sensor input #1 circuit-
voltage above normal, or shorted to high
source
Amber
4
4
Auxiliary temperature sensor input #1
circuit-voltage below normal, or shorted to low
White
14
14
Auxiliary pressure sensor input #2 engine
protection - data valid but above normal
operational range -most severe level
Amber
3
3
Auxiliary pressure sensor input #2
circuit-voltage above normal, or shorted to high
source
Amber
4
4
Auxiliary pressure sensor input #2
circuit-voltage below normal, or shorted to low
source
None
14
31
J1939 send engine stop instruction
Amber
3
3
Fuel delivery pump actuator circuit-voltage
above normal, or shorted to high source
Amber
7
7
Fuel delivery pump actuator-mechanical block
Engine control module-warning internal
hardware failure
Amber
12
12
Engine control module- warning software
failure