Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 10)

7
Operator Instructions
Flange or Panel—Warning Signals
Single Terrain Light
• Flashing - System is working to achieve new pressures
associated with that mode light.
• Solid - Pressure is achieved, system is not active, and wheel
valves are closed.
2 Terrain Lights on Solid
System has shut off, closing wheel valves, with tire pressure
between two mode settings.
• Infl ating or defl ating tires is taking too long.
• CTIS is still operational.
• Select any mode button to re-attempt pressure change.
• On 2-channel systems, normal operation continues on
unaffected channel.
• Frequent occurrences may indicate need for service.
4 Terrain Lights Flashing or CHECK TIRES Flashing
Indicates low pressure in one or more tires. Stop vehicle and
identify damage.
• System shuts off, closing wheel valves, and waits for
operator instruction.
• Tire damage is possible.
• CTIS should not be operated if major tire damage is found.
Repair tire before continuing to operate vehicle.
• On 2-channel systems, normal operation will continue on
the unaffected channel.
• If tire damage is minimal, operate CTIS by selecting RUN
FLAT.
Note: Repeated use of RUN FLAT to override mode light warnings
may result in tires infl ating higher than set point.
Note: Excessive air seal leakage on cold weather startup may
result in "4-5 Mode Lights" warning. If no tire damage exists, this
condition will self-correct as seals warm up with use.
5 Lights Flashing
System shuts off at least one channel due to fault detection on a
CTIS component.
• System closes wheel valves.
• System may periodically cycle PCU to determine if fault still
exists.
• On 2-channel systems, operation may be allowed on the
unaffected channel.
• Get service at next opportunity.
• No ability to override system.
Several warning signals report operating problems. The Central Tire Infl ation System uses general sequences displayed
on the electronic control unit lights and an instrument panel-mounted warning lamp to identify the type and area of fault.