Speed Control System Diagnostics; Table 9−1 Enscu Led Fault Chart - Carrier VECTOR 6500 Operation & Service Manual

9.5 Speed Control System Diagnostics

1 Engine Over Speed: more than 2,530 RPM
2 No signal from ENSSN for 2 seconds after RPM
is greater than 1,000 RPM for 10 seconds, OR
for 5 seconds while engine cranking (no voltage
at ENSCU pin 18).
3 Fuel/speed actuator (FSA) wiring disconnected
or open circuit. Coil Resistance Spec: 2.8 ohm
+/- 10%.
4 ENSCU supply voltage is greater than 26V.
62-11389
Table 9−1 ENSCU LED Fault Chart
Fault LED flash code
One Long–One Short
Two Long–One Short
Two Long–Three Short
Two Long–Seven Short
9−8
Diagnostic tree
Figure 9−1
Figure 9−2
Figure 9−3
Figure 9−4