Symptom Tree t062
| Cause | Correction |
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Electronic fault codes active or high counts of inactive fault codes |
Refer to Section TF in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118, for fault code troubleshooting. |
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Condition occurs only at idle |
Refer to the Engine Runs Rough at Idle symptom tree. |
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Engine is cold |
Allow the engine to warm to operating temperature. If the engine will not reach operating temperature, refer to the Coolant Temperature is Below Normal symptom tree. |
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Coil wire malfunctioning |
Remove wire from engine and use a digital multimeter to measure resistance across the wire. Refer to Procedure 013-012. |
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Ignition coil malfunctioning |
Check the ignition coil. Refer to Procedure 013-012. |
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Spark plug(s) damaged or incorrect gap |
Inspect plug(s). Refer to Procedure 013-016. |
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Ignition system harness connector pins bent or damaged |
Inspect harness. Refer to Procedure 019-196 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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Battery voltage is low or bad ground connection at battery |
Check the batteries. Check the battery circuit. The battery cable ground must measure within OEM specifications for voltage drop under electrical load. Refer to Procedure 013-007. |
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Fuel leak |
Check the fuel lines, fuel connections, and fuel filters for leaks using the combustible gas detector service tool. Refer to Procedures 005-003, 005-047, and 005-052. |
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Low or no fuel pressure at the mixer (secondary pressure) |
Use an electronic service tool to measure the fuel pressure after the gas mass flow sensor and before the mixer. Refer to Procedure 005-047. |
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Low or no fuel pressure at the fuel filter (primary pressure) |
Use an electronic service tool to measure the fuel pressure at the fuel filter. Refer to Procedure 005-061. |
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Oxygen sensor offset parameter is not correct |
Verify that the offset parameter on the oxygen sensor tag matches the oxygen sensor offset parameter listed in INSITE™. Refer to the INSITE™ User’s Manual, Bulletin 3885798. |
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Heated oxygen sensor is damaged or has drifted |
Use INSITE™ to check for significantly improved engine performance with the system in open-loop operation. Refer to the INSITE™ User’s Manual, Bulletin 3885798. |
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Oil from the fuel has accumulated on the gas mass flow sensor, screen packs, or elsewhere in the fuel system |
Check for oil in the fuel system. Refer to Procedure 005-009. |
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Engine position sensor (EPS) is not installed correctly |
Check the engine position sensor for correct installation. Refer to Procedure 019-038 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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Engine position sensor (EPS) damaged |
Check the EPS. Refer to Procedure 019-038 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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Fuel grade is not correct for the application or the fuel quality is poor |
Operate the engine from a tank of high-quality fuel. Refer to Fuels for Cummins Engines, Bulletin 3379001. |
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Overhead adjustments are not correct |
Measure and adjust the overhead settings. Refer to Procedure 003-004. |
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Camshaft is damaged |
Inspect the camshaft for damage. Refer to Procedure 001-008. |
