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______________ Wheels and Tires/Central Tire Inflation System (CTIS) 6-35 ® 05745159 CTIS Leak Detection Test 1. Start engine and inflate front and rear tires to 40 psi (276 2. Turn the tire selector switch to OFF. 3. Turn engine OFF. 4. Remove air vent line located at the air intake horn and 5. Remove the transmission dipstick from the dipstick tube 6. If air or fluid is detected in steps 4 or 5, inspect the CTIS Leak Isolation Test 1. Start the engine and inflate front and rear tires to 40 psi 2. Turn the tire selector switch to OFF. 3. Turn engine OFF. 4. Close (release) all four wheel quick-disconnect valves. 5. Remove the vent line from one geared hub. 6. Open (engage) the quick-disconnect valve at this wheel to 7. Listen for escaping air around the steering arm seal 8. If air is escaping through the vent line fitting, replace the 9. Inspect the other three geared hubs using steps 5, 6, 7, and 10. Replace defective seals as required, then retest system. CTIS Leakdown Testing NOTE: Suspected air loss in the CTIS after the vehicle has 1. Verify quick-disconnect valves are connected to wheels. 2. Apply parking brake. Start engine and allow to idle. 3. Place tire selector switch to BOTH position and inflate/ 4. Observe air pressure gauges until air pressure reaches 40 5. Place inflate/deflate switch to OFF position. Stop engine. 6. Record tire pressure on instrument panel gauges and right- Inspect the quick-disconnect valve, Quick-disconnect compo- Replace the Tighten all connections. If air is still leak- Inspect the tire for punctures and rim Troubleshooting Chart 5– Tire and Quick-Disconnect Valve |