Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 48)

45
Service Codes
No Terrain Lights or DDM – Blank Display (Code 17)
Type: Power
Code Description
A “Power” code indicates a power fault and sets when the
system power is outside a 24-volt system’s acceptable range
of 18 to 32 Volts. The fault could be caused by low battery
power or some other problem with the basic vehicle electrical
system.
If the vehicle power system checks out satisfactorily, other
possible causes include bad Electronic Control Unit (ECU)
connections, or a faulty ECU.
In inspecting circuits and connections for a Power code, pay
particular attention to a bad ground connection, which could
be causing the fault.
See “Troubleshooting Tips” for general guidelines on system
diagnostics.
System Mode Condition Possible Causes (listed in order of likely occurrence)
No Operation Power out of range • Low voltage
• Poor ground connection to ECU
• Poor power connection to ECU
• High vehicle electrical system voltage
• Faulty ECU
T S
A B
C
U
R
P
a
b
c V
D
E
F
G
W
H
X
J
K
Y L
M Z
N
ECU Harness Connector
A B C D E
A B C D E
A B C D E
F G H J K 3
2
1
F G H J K
F G H J K
– or –