Symptom Tree t064
| 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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OEM engine protection system is active or is malfunctioning |
Isolate the OEM engine protection system. Follow the OEM service manuals to check for a malfunction. |
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Engine will not restart |
Refer to the Engine Difficult to Start or Will Not Start symptom tree. |
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Battery voltage supply to the electronic control module (ECM) is low, interrupted, or open |
Check the battery connections, the fuses, and the unswitched battery supply circuit. Refer to Procedure 013-009 and Procedures 019-198 and 019-087 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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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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Engine position sensor (EPS) or circuit is malfunctioning |
Check the engine position sensor and circuit. Refer to Procedures 019-038 and 019-039 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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Keyswitch circuit is malfunctioning |
Check the vehicle, equipment, or vessel keyswitch circuit. Refer to Procedure 019-064 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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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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Fuel control valve is malfunctioning |
Check the fuel control valve for sticking or hysteresis. Refer to Procedure 019-102 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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Accessory load is excessive |
Check the accessory load and reduce the load if necessary. Refer to the OEM service manual. |
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Engine idle speed is set too low |
Use INSITE™ to verify that the engine idles at 600 rpm with no accessory load and 0-percent throttle when the idle bypass valve is unplugged. Adjust the idle setscrew if necessary. Refer to the INSITE™ User’s Manual, Bulletin 3885798, and Procedure 005-052. |
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Idle speed control valve malfunctioning |
Inspect the idle speed control valve. Refer to Procedure 005-052. |
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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. |
