Symptom Tree t045
| 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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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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Engine position sensor (EPS) or circuit is malfunctioning |
Check the engine position sensor and circuit. Refer to Procedure 019-038 or 019-039 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) 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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High, low, or no fuel pressure at the mixer |
Measure pressure after low-pressure regulator (natural gas). Refer to Procedure 005-047 and Procedure 005-061. |
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Fuel shutoff valve solenoid or circuit is malfunctioning (electronic controlled fuel systems) |
Check the fuel shutoff valve solenoid and circuit. Refer to Procedures 019-049 and 019-050 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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Fuel shutoff valve is closed |
Check for loose wires. Check for at least 9.5 VDC from the battery during cranking. Refer to Procedures 019-049 and 019-050 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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High, low, or no fuel pressure at the low-pressure regulator |
Measure the fuel pressure at the low-pressure regulator on the inlet side of engine. Refer to Procedure 005-061. |
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OEM shutoff valve is closed |
Check the OEM fuel shutoff valves. Verify that the fuel tanks are open. |
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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, 005-052. |
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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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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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Moisture in the wiring harness connectors |
Dry the connectors with Cummins electronic cleaner, Part Number 3824510. |
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Camshaft timing is not correct (after engine rebuild or repair) |
Check the gear train timing alignment. Refer to Procedure 001-008. |
