Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 30)

27
Service Codes
5 Flashing Lights or DDM – Dashes "--" or 5 Flashing Lights and Check Tires Solid
(Codes 36, 37)
Type: Inflate Trend
Code Description
An “Inflate Trend” code displays when tire pressure readings
are dropping while in inflate mode. Tire damage, which the
compressor cannot keep up with, may have occurred after
starting an inflate sequence. When possible, a 2-channel sys-
tem will isolate this fault to a given channel.
The air leak can be located either before or after the wheel
valve location. The components located before the wheel
valve that may cause this include:
• Leaking control lines
• Leaking Quick Release Valve (QRV) exhaust port
• Leaking wheel air seals
Components located after the wheel valve that may cause this
include:
• Tire damage
• Rim leaks
• Leaking air lines
• Faulty wheel valve
To correctly diagnose the faulty component, connect the Diag-
nostic Tool (see "Diagnostics" for test equipment and descrip-
tions) and follow the procedure in the Inflate Trend
troubleshooting tree.
See “Troubleshooting Tips” for general guidelines on system
diagnostics.
System Mode Condition Possible Causes (listed in order of likely occurrence)
Channel
inoperative Loss of channel pressure in
inflate mode • Damaged or leaking tire
• Leaking lines
• Leaking seals
• Leaking QRV
• Leaking wheel valve
• Faulty PCU