12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit FAULT CODE 456 - Fuel Pressure Sensor Circuit Troubleshooting Summary STEPS SPECIFICATIONS STEP 1. Check for other fault codes. STEP 1A. Read the fault Other active fault codes? codes. STEP 2. Inspect fuel pressure sensor circuit. STEP 2A. Inspect circuit for No damage to circuit. damage. STEP 3. Check the inlet restriction. STEP 3A. Measure fuel inlet Less than 254 mm Hg [10 in restriction. Hg] of restriction at CAPS inlet. STEP 4. Check for air in the fuel system. STEP 4A. Verify that there is No air detected. no air in the fuel system. STEP 5. Check the fuel lift pump. STEP 5A. Measure the fuel Fuel lift pump flow meets lift pump flow. specifications. STEP 6. Check the wiring harness. STEP 6A. Inspect the engine No damaged pins. wiring harness and the engine control module (ECM) connector pins. STEP 6B. Check for an open Less than 10 ohms. circuit. STEP 6C. Inspect the fuel More than 100k ohms. pressure sensor circuit for a short circuit. https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 1/10 12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit STEPS SPECIFICATIONS STEP 6D. Inspect the fuel More than 100k ohms. pressure sensor circuit for a short circuit to ground. STEP 7. Clear the fault codes. STEP 7A. Disable the fault Fault code disabled. codes. STEP 7B. Clear inactive fault All fault codes cleared. codes. STEP 1. Check for other fault codes. STEP 1A. Read the fault codes. Conditions : Turn keyswitch ON. Action Specification/Repair Next Step Read the fault codes. No other active fault codes. 2A Use INSITE™ electronic service tool Appropriate fault code Other active fault codes. to read the fault codes. troubleshooting tree. STEP 2. Inspect the fuel pressure sensor circuit. STEP 2A. Inspect the fuel pressure sensor circuit for visual damage. Conditions : Turn keyswitch to the OFF. Action Specification/Repair Next Step Check the fuel pressure No visual signs of damage. 3A supply voltage. Make sure pins are not fretted. https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 2/10 12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit Make sure sensor potting is intact. Check the pressure sensor pig tail. Check for wire abrasion. Check for shorts to the rate shape tube or adjacent wires. Visual signs of damage. Make sure wires have not come out of the Replace the fuel pressure sensor or connector by sensor and install the flexing and tugging on pressure sensor bracket kit, 7A wires. it it is not already installed. Reference Service Bulletin Make sure the 4021293 and/or 4021294. triangular connector has not rubbed against the rate shape tube. Use the following procedure for general inspection techniques. Refer to Procedure 019-361 in Section 19. (/qs3/pubsys2/xml/en/proce dures/99/99-019-361.html) STEP 3. Check the inlet restriction. STEP 3A. Measure the fuel inlet restriction. Conditions : Turn keyswitch to the ON. If intermittent issue, check the inlet restriction while duplicating the complaint. Action Specification/Repair Next Step https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 3/10 12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit Less than 254 mm Hg [10 in Hg] of restriction at CAPS 4A inlet. Check the inlet restriction. Use the following More than 254 mm Hg [10 in procedure in the ISC, Hg] of restriction at CAPS ISCe, QSC8.3, ISL, inlet. ISLe3, ISLe4 and QSL9 Correct source of inlet Troubleshooting and restriction. Repair Manual, Bulletin Use the following procedure 4021418. Refer to in the ISC, ISCe, QSC8.3, 7A Procedure 006-020 in ISL, ISLe3, ISLe4 and QSL9 Section 6. Troubleshooting and Repair (/qs3/pubsys2/xml/en/pr Manual, Bulletin 4021418. ocedures/45/45-006- Refer to Procedure 006-020 020-tr.html) in Section 6. (/qs3/pubsys2/xml/en/proce dures/45/45-006-020-tr.html) STEP 4. Check for air in the fuel system. STEP 4A. Verify there is no air in the fuel. Conditions : Turn keyswitch to the ON. If intermittent issue, check for air while duplicating the complaint. Action Specification/Repair Next Step Check for air in the fuel. No air detected. 5A Use the following procedure in the ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Troubleshooting and Repair Manual, Bulletin 4021418. Refer to Procedure 006-020 in Section 6. (/qs3/pubsys2/xml/en/pr https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 4/10 12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit ocedures/45/45-006- Air detected. 020-tr.html) Correct source of the air leak. Use the following procedure in the ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 7A Troubleshooting and Repair Manual, Bulletin 4021418. Refer to Procedure 006-003 in Section 6. (/qs3/pubsys2/xml/en/proce dures/45/45-006-003-tr.html) STEP 5. Check the fuel lift pump. STEP 5A. Measure the fuel lift pump flow. Conditions : Turn keyswitch ON. Action Specification/Repair Next Step Fuel lift pump flow meets Perform fuel lift pump flow 6A specifications. test. Use the following Fuel lift pump flow does not procedure in the ISC, meet specifications. ISCe, QSC8.3, ISL, Replace the fuel lift pump. ISLe3, ISLe4 and QSL9 Use the following procedure Troubleshooting and in the ISC, ISCe, QSC8.3, Repair Manual, Bulletin ISL, ISLe3, ISLe4 and QSL9 7A 4021418. Refer to Troubleshooting and Repair Procedure 005-045 in Manual, Bulletin 4021418. Section 5. Refer to Procedure 005-045 (/qs3/pubsys2/xml/en/pr in Section 5. ocedures/45/45-005- (/qs3/pubsys2/xml/en/proce 045-tr.html) dures/45/45-005-045-tr.html) https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 5/10 12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit STEP 6. Check the engine wiring harness. STEP 6A. Inspect the engine wiring harness and the ECM connector pins. Conditions : Turn keyswitch OFF. Disconnect the engine wiring harness from the ECM. Disconnect the engine wiring harness from the fuel pressure sensor. Action Specification/Repair Next Step Inspect the engine wiring No damaged pins. 6B harness and ECM connectors pins for the following: Loose connector Corroded pins Damaged pins. Bent or broken pins Repair or replace the engine Pushed back or harness or ECM, whichever expanded pins has the damaged pins. Moisture in or on the Repair the engine harness. connector Refer to Procedure 019-204 Missing or damaged in Section 19. connector seals (/qs3/pubsys2/xml/en/proce dures/99/99-019-204.html) Dirt or debris in or on the connector pins Replace the engine 7A harness. Refer to Procedure Connector shell broken 019-043 in Section 19. Wire insulation damage (/qs3/pubsys2/xml/en/proce dures/71/71-019-043.html) Damaged connector locking tab. Replace the ECM. Refer to Procedure 019-031 in Use the following procedure Section 19. for general inspection (/qs3/pubsys2/xml/en/proce techniques. Refer to dures/71/71-019-031.html) Procedure 019-361 in Section 19. (/qs3/pubsys2/xml/en/proce dures/99/99-019-361.html) https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 6/10 12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit STEP 6B. Inspect the fuel pressure sensor circuit for an open circuit. Conditions : Turn keyswitch OFF. Disconnect the engine wiring harness from the ECM. Disconnect the engine wiring harness from the fuel pressure sensor. Action Specification/Repair Next Step Check for an open circuit in the fuel pressure sensor If less than 10 ohms, no circuit. 6C open circuit. Measure the resistance from pin-46 of the engine wiring harness to pin-C of the fuel pressure sensor connector. Measure the resistance from pin-10 of the engine wiring harness to pin-A of the fuel Repair or replace the engine pressure sensor wiring harness. connector. Repair the engine harness. Measure the resistance Refer to Procedure 019-204 from pin-19 of the in Section 19. engine wiring harness (/qs3/pubsys2/xml/en/proce to pin-B of the fuel dures/99/99-019-204.html) 7A pressure sensor Replace the engine connector. harness. Refer to Procedure Refer to the wiring diagram 019-043 in Section 19. for connector pin (/qs3/pubsys2/xml/en/proce identification. dures/71/71-019-043.html) Use the following procedure for general resistance measurement techniques. Refer to Procedure 019-360 in Section 19. (/qs3/pubsys2/xml/en/proce dures/99/99-019-360.html) https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 7/10 12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit STEP 6C. Inspect the fuel pressure sensor circuit for a short circuit. Conditions : Turn keyswitch ON. Disconnect the engine wiring harness from the ECM. Disconnect the engine wiring harness from all sensors that share the common ground. Action Specification/Repair Next Step Check for a short circuit in the fuel pressure sensor If greater than 100k ohms, circuit. no shorts. 6D Measure the resistance from pin-46 of the engine wiring harness to all other pins in the ECM connector. Measure the resistance from pin-10 of the engine wiring harness Repair or replace the engine to all other pins in the wiring harness. ECM connector. Repair the engine harness. Measure the resistance Refer to Procedure 019-204 from pin-19 of the in Section 19. engine wiring harness (/qs3/pubsys2/xml/en/proce to all other pins in the dures/99/99-019-204.html) 7A ECM connector. Replace the engine Refer to the wiring diagram harness. Refer to Procedure for connector pin 019-043 in Section 19. identification. (/qs3/pubsys2/xml/en/proce Use the following procedure dures/71/71-019-043.html) for general resistance measurement techniques. Refer to Procedure 019-360 in Section 19. (/qs3/pubsys2/xml/en/proce dures/99/99-019-360.html) STEP 6D. Inspect the fuel pressure sensor circuit for a short circuit to ground. https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 8/10 12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit Conditions : Turn keyswitch ON. Disconnect the engine wiring harness from the ECM. Disconnect the engine wiring harness from all sensors that share the common ground. Action Specification/Repair Next Step Check for a short circuit in the fuel pressure sensor If greater than 100k ohms, circuit. no shorts. 7A Measure the resistance from pin-46 of the engine wiring harness to chassis ground. Measure the resistance from pin-10 of the Repair or replace the engine engine wiring harness wiring harness. to chassis ground. Repair the engine harness. Measure the resistance Refer to Procedure 019-204 from pin-19 of the in Section 19. engine wiring harness (/qs3/pubsys2/xml/en/proce to chassis ground. 7A dures/99/99-019-204.html) Refer to the wiring diagram Replace the engine for connector pin harness. Refer to Procedure identification. 019-043 in Section 19. Use the following procedure (/qs3/pubsys2/xml/en/proce for general resistance dures/71/71-019-043.html) measurement techniques. Refer to Procedure 019-360 in Section 19. (/qs3/pubsys2/xml/en/proce dures/99/99-019-360.html) STEP 7. Clear the fault codes. STEP 7A. Disable the fault codes. https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 9/10 12/16/2020 FAULT CODE 456 - Fuel Pressure Sensor Circuit Conditions : Connect all components. Turn keyswitch ON. Action Specification/Repair Next Step Disable the fault codes. Fault Code 456 inactive. 7B Start the engine and let Return to the it idle for 1 minute. troubleshooting steps, or contact your local Use INSITE™ Go to the appropriate Cummins® Authorized electronic service tool troubleshooting chart. Repair Location if all steps to verify that Fault Code have been completed and 456 is inactive. checked again. STEP 7B. Clear inactive fault codes. Conditions : Connect all components. Turn keyswitch ON. Action Specification/Repair Next Step Clear the inactive fault codes. All fault codes cleared. Repair complete. Use INSITE™ electronic service tool Troubleshoot any remaining Appropriate to clear the inactive active fault codes. troubleshooting chart. fault codes. Last Modified: 15-Apr-2013 https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/71/71-t05-456.html 10/10
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