Symptom Tree t010
| Cause | Correction |
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Air system leaks |
Block the vehicle wheels and check the air system for leaks with spring brakes applied and released. Check for leaks from the air compressor gaskets and the air system hoses, fittings, tanks, and valves. Refer to the OEM service manual. For applications fitted with selective catalytic reduction exhaust systems, check the air supply line to the dosing control unit. |
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Air governor is malfunctioning or not set correctly |
Check the air governor for correct operation. Make sure the air governor is located less than 0.6 m [2 ft] from the air compressor. Refer to the OEM service manual. |
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Unloader valve is malfunctioning |
Check the unloader valve and unloader body seal. Refer to the OEM service manual. |
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Air governor signal line or actuator line is plugged |
Inspect the signal line and actuator line. Refer to the manufacturer’s instructions. |
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Air system component is malfunctioning |
Check the operation of check valves, alcohol evaporators, air dryers, and other OEM-installed air system components. Refer to the manufacturer’s instructions. |
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|
Air compressor intake or exhaust valve leaks air |
Inspect the air compressor intake and exhaust valve assemblies. Refer to the OEM service manual. |
