Symptom Tree t128
| Cause | Correction |
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Electronic fault codes active or high counts of inactive fault codes |
Refer to Section TF in Troubleshooting and Repair Manual, ISB, ISBe4, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL, ISLe3, and QSL9 Engines, CM850 Electronic Control System, Bulletin 4021416. |
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Urea tank empty or incorrect fluid |
Verify urea is in the reservoir tank. Fill the tank with urea, if empty. Refer to the progressive damage limits, if fuel, oil, or coolant, were found in the reservoir tank. |
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Urea leak (external) |
Inspect for external urea leaks or crystallization at exhaust joints, tailpipe exit, aftertreatment nozzle, or associated plumbing. Repair as necessary. Refer to Procedure 011-036, Exhaust Catalyst, and Procedure 011-040, Aftertreatment Nozzle. |
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Extended operation of the engine in low-duty cycle, extended idling, and/or low ambient temperatures can result in reduced urea usage. Conversely, extended operation of the engine in high-duty cycle and/or high ambient temperatures can result in increased urea usage |
Perform Urea Doser Pump Override Test with INSITE™ electronic service tool. Refer to Procedure 019-440 in Troubleshooting and Repair Manual, ISB, ISBe4, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL, ISLe3, and QSL9 Engines, CM850 Electronic Control System, Bulletin 4021416. |
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Urea leak (internal) |
Inspect for internal urea leaks or crystallization between the aftertreatment nozzle and the exhaust catalyst. Repair as necessary. Refer to Procedure 011-036, Exhaust Catalyst, and Procedure 011-040, Aftertreatment Nozzle. |
