Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 3)

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Table of Contents
Table of Contents
General Information
Central Tire Inflation System (CTIS) . . . . . . . . . . . . . . . 1
Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Component Description . . . . . . . . . . . . . . . . . . . . . . . . 2
Central Tire Inflation System Components . . . . . . . . . . 3
Simplified System Schematic . . . . . . . . . . . . . . . . . . . . 4
Operator Instructions
Flange or Panel
Operator Controls . . . . . . . . . . . . . . . . . . . . . . . . . 5
Warning Signals . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Driver Display Module (DDM)
Operator Controls . . . . . . . . . . . . . . . . . . . . . . . . . 9
Warning Signals . . . . . . . . . . . . . . . . . . . . . . . . . 10
Diagnostics
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Service Codes Summary . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . 20
Service Codes
5 Flashing Lights or DDM – Dashes "--"
Low Pressure (Codes 26, 27) . . . . . . . . . . . . . . . 21
Low Air Supply (Code 32) . . . . . . . . . . . . . . . . . . 23
Atmospheric (Code 35) . . . . . . . . . . . . . . . . . . . . 25
Inflate Trend (Codes 36, 37) . . . . . . . . . . . . . . . . 27
Deflate Trend (Code 14) . . . . . . . . . . . . . . . . . . . 29
PCU Sensor (Codes 33, 34) . . . . . . . . . . . . . . . . 31
Pressure Switch (Code 31) . . . . . . . . . . . . . . . . . 33
4 Flashing Lights or CHECK TIRES Flashing
Tire Leak (Imbalance) (Codes 44, 45) . . . . . . . . . 35
Tire Leak (Confirm) (Codes 41, 42) . . . . . . . . . . 37
2 Terrain Lights on Solid or DDM – Dashes "--"
Between Modes (Codes 23, 24) . . . . . . . . . . . . . 39
Deflate Signal (Codes 11, 12, 16) . . . . . . . . . . . . 41
No Terrain Lights or DDM – Dashes "--"
PCU Solenoid (Supply, Deflate, Control, Front,
or Rear) (Codes 51, 52, 54, 55, 56) . . . . . . . . . . 43
No Terrain Lights or DDM – Blank Display
Power (Code 17) . . . . . . . . . . . . . . . . . . . . . . . . . 45
DDM – Dashes "--"
Display Control Communications (Code 75) . . . . 47
Lights Sequentially Flashing
Configuration Error . . . . . . . . . . . . . . . . . . . . . . . 49
Solid Warning Lamp or Solid OVER SPEED
Speed Signal (Codes 18, 76, 77) . . . . . . . . . . . . 51
No Indication or DDM – Dashes "--"
Miscellaneous Output (Codes 53, 57, 58, 67, 68) 53
No Indication
Wheel Valve Shut Off (Codes 61, 62, 64, 65) . . . 55
No Code
Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Service Guidelines
CTIS Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Joint Compounds and Fittings . . . . . . . . . . . . . . . . . . .59
Air Filter Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Wire Harness
Connector Illustrations . . . . . . . . . . . . . . . . . . . . . . . .61
M939 Wiring Diagram (676422 and 676603) . . . . . . . .62
Flange Mount Wiring Diagram . . . . . . . . . . . . . . . . . . .63
Panel Mount Wiring Diagram . . . . . . . . . . . . . . . . . . . .64
Chassis ECU with DDM Wiring Diagram
Separate Power and Switched Ignition . . . . . . . . .65
All Power Switched . . . . . . . . . . . . . . . . . . . . . . . .66
Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . .67