Possible Causes
• Continue downhill on a steep slope (if applicable)
• Diagnostic code • One or more turbochargers
• Intake air contains combustible gas or liquid Suggested Actions
Note: These steps are listed below in order of probability.
Perform these steps in sequence.
Fault diagnosis and troubleshooting test steps
1. Continue downhill on the steep slope (if applicable). Engine brakes may need to be engaged on steep slopes. Engine brakes are not available in all applications.
A. Ensure the operator understands the correct operation of the machine when using the engine brake.
Result: The steep slope was the cause of the speeding.
Repair: Control the engine speed on the steep slope.
Result: The steep slope was not the cause of the speeding.
Proceed to test step 2
2. Diagnostic Codes
A. Before performing any troubleshooting or clearing any diagnostic codes, download the warranty report and bar chart product status report. Note: If troubleshooting assistance is required, the Distributor Solution Network (DSN) will request the download of this information.
B. Use electronic repair tools to check for activated or recorded codes.
Result: No diagnostic codes activated or recorded. Return the unit to operation. Result: At least one of the diagnostic codes listed in Table 1 is active or recently recorded. Proceed to test step 3.
3. One or more turbochargers Note: Turbochargers mounted on the engine are non-maintainable items. If any mechanical failure is found, the faulty turbocharger must be replaced.
Result: Engine oil from the turbocharger leaked into the intake air.
Repair: Replace the faulty turbocharger. Proceed to step 5 of the test.
4. The intake air contains flammable gas or liquid.
A. Check for any flammable gas in the surrounding area.
B. Check for any flammable liquid in the intake air.
Result: Combustible gas is present in the atmosphere.
Repair: Do not operate the engine in an environment containing combustible gas. Result: Combustible liquid is present in the intake air.
Repair: Remove the liquid. Investigate and eliminate the cause of the liquid contamination.
Result: Combustible gas is no longer present in the intake air.
Please contact the Dealer Solutions Network (DSN).
5. Check the aftertreatment system for oil.
A. Use a clean cloth to remove excess oil from the hoses.
B. Remove the Clean Emission Module (CEM). See Disassembly and Assembly, “Clean Emission Module – Removal and Installation”.
C. With the exhaust inlet facing down, support the CEM above a suitable container. Allow the CEM to discharge for 8 hours.
D. Check the amount of oil discharged from the container.
Result: Oil discharge volume greater than 1.0 L (1.05669 qt).
Repair: Install replacement CEM.
Refer to Disassembly and Assembly, “Cleaning the Discharge Module – Removal and Installation”.
Return the unit to operation.
Result: Oil discharge volume less than 1.0 L (1.05669 qt). Proceed to test step 6.
6. Restore the Aftertreatment System
A. Clean the hoses and CEM inlet of any residual oil with a clean cloth.
B. Install the Clean Emission Module (CEM). See Disassembly and Assembly, “Clean Emission Module – Removal and Installation”.
C. Run the engine at high idle speed for at least 20 minutes under no-load conditions.
Note: There are two versions of the “Aftertreatment Restoration Steps” below.
Step 1. One version is for engines equipped with DPF. Another version is for engines without DPF. Ensure the correct steps are followed. D. Perform the “Aftertreatment Recovery Step” using electronic repair tools. During the step, check for smoke in the exhaust. Some smoke may be noticeable during the step. The smoke must be dissipated before completing the step.
Result: After completing the “Post-treatment Recovery Step”, the soot load is less than 80% and there is no smoke in the exhaust. The unit is then returned to operation.
Result: After completing the “Post-treatment Recovery Step”, the soot load is greater than 80% or there is smoke in the exhaust.
