Download SELF-DIAGNOSTICS – EEC-V (DIESEL) -2000 Ford Pickup F250 Super Duty EXHAUST BACKPRESSURE (EBP) SENSOR. Perform this test when directed by QUICK TEST. This test is intended to diagnose: Exhaust Backpressure (EBP) Sensor • Wiring Harness Circuits (SIG RTN, VREF & EBP Signal) • Powertrain Control Module (PCM) • 1) DTC P0470 This DTC indicates PCM detected EBP sensor malfunction during KOEO ON-DEMAND SELF-TEST. Possible causes for this DTC are: Faulty EBP Sensor • Open Or Shorted Circuit • Faulty PCM • Ensure scan tool is connected to Data Link Connector (DLC). Using scan tool, select EBP PID from PID/DATA monitor menu. If EBP reading is less than 18.5 psi, clear DTCs. Repeat KOEO ON-DEMAND SELF-TEST . If DTC is still present, replace PCM. If EBP reading is 18.5 psi or more, go to next step. 2) Check Signal Ground Circuit Turn ignition off. Disconnect EBP sensor connector. Sensor is located on top front of engine. Inspect for damaged pins, corrosion and loose wires. Repair as necessary. Measure resistance between ground and Gray/Red wire at EBP sensor wiring harness connector. See Fig. 11 . If resistance is less than 5 ohms, replace EBP sensor. If resistance is 5 ohms or more, locate and repair open circuit in Gray/Red wire. 3) Continuous DTC P0470 This DTC indicates PCM detected a EBP sensor malfunction during normal driving conditions. Possible causes for this DTC are: Faulty EBP Sensor • Faulty Connection • Faulty PCM • Ensure scan tool is connected to Data Link Connector (DLC). Using scan tool, select EBP PID from PID/DATA monitor menu. While observing EBP PID, wiggle and bend small sections of wiring harness starting at EBP sensor connector and working toward PCM. If EBP reading fluctuates, isolate fault and repair as necessary. If reading does not fluctuate, go to next step. 4) Check Connector Disconnect EBP sensor connector. Sensor is located on top front of engine. Disconnect PCM 104-pin connector. Inspect connectors for damaged pins, corrosion and loose wires. Repair as necessary. Clear DTCs and repeat QUICK TEST . If both connectors are okay, no problem is indicted at this time. 5) DTC P0471 This DTC indicates PCM detected an EBP sensor malfunction during normal driving conditions and with EBP sensor enabled. Possible causes for this DTC are: Faulty EBP Sensor. • Plugged Or Restricted Sensor Supply Tube • Damaged Exhaust Pressure Regulator (EPR) Linkage Or Butterfly Damage • Faulty PCM • Perform KOER ON-DEMAND SELF-TEST . If any DTCs are present, repair fault(s) before continuing with this test. Using scan tool, select EBP PID from PID/DATA monitor menu. Road test vehicle performing hard accelerations while monitoring EBP PID. If EBP reading increases to more than 25 psi with EBP sensor on, no problem is indicated at this time. If EBP reading does not increase to more than 25 psi, go to next step.
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