Symptom Tree t005
| 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 Procedure 012-019 and the OEM service manual. |
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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 Procedure 012-017. |
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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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E-type system is not plumbed correctly |
Install an Econ valve, a check valve, and system hoses. Refer to the Master Repair Manual, Holset Air Compressors, Bulletin 3666121. |
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Carbon buildup is excessive in the air discharge line, check valve, or cylinder head |
Check for carbon buildup. Replace the air compressor discharge line, if necessary. Check the turbocharger for oil leaks. Check the intake tube for oil. Refer to Procedures 012-003, 010-040, and 010-049. |
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Air compressor pumping time is excessive |
Replace the desiccant cartridge on the Turbo/CR 2000 air dryer. Refer to the OEM service manual. Check the air compressor duty cycle. Install a larger air compressor, if necessary. Refer to the Master Repair Manual, Holset Air Compressors, Bulletin 3666121. |
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Air dryer outlet check valve is sticking |
Lubricate or replace the air dryer outlet check valve assembly. Refer to the manufacturer’s instructions. |
