Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 32)

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Service Codes
5 Flashing Lights or DDM – Dashes "--" (Code 14)
Type: Deflate Trend
Code Description
A “Deflate Trend” code displays when the system has deter-
mined that a deflate sequence is not functioning correctly.
This is the result of either a pressure increase during a defla-
tion, or the system failing to lower the tires even a small
amount of the desired pressure drop.
System Mode Condition Possible Causes (listed in order of likely occurrence)
Inflate only Improper deflate sequence • Upper control line leak
• Plugged or restricted PCU vent line
• Faulty PCU relief valve
• Poor ground connection to PCU sensor
• Contaminated PCU
• Faulty PCU