Page 1 of 8 EBP Sensor (Exhaust Back Pressure) DTC SPN FMI Condition 3341 1209 4 EBP signal out-of-range LOW 3342 1209 3 EBP signal out-of-range HIGH
Page 2 of 8 Function diagram for the EBP sensor The EBP sensor function diagram includes the following: Exhaust Back Pressure (EBP) sensor Electronic Control Module (ECM) with integrated Barometric Absolute Pressure (BAP) sensor
Page 3 of 8 Variable Geometry Turbocharger (VGT) Exhaust Gas Recirculation (EGR) valve Malfunction Indicator Lamp (MIL) Function The EBP sensor measures exhaust back pressure. The ECM uses the EBP signals to control the VGT and EGR systems. Sensor Location The EBP sensor is installed in a bracket mounted above and behind the right valve cover. Tools Electronic Service Tool (EST) with MasterDiagnostics software EZ-Tech Interface Kit Digital Multimeter (DMM) 3-Banana Plug Harness 180-Pin Breakout Box Pressure Sensor Breakout Harness Terminal Test Adapter Kit EBP Sensor End Diagnostics DTC Condition Possible Causes 3341 EBP signal out-of-range LOW 3342 EBP signal out-of-range HIGH EBP signal circuit OPEN or short to GND VREF circuit OPEN or short to GND Failed sensor EBP signal circuit short to PWR Failed sensor
Page 4 of 8 EBP circuit diagram WARNING:
Page 5 of 8 To prevent personal injury or death, stay clear of rotating part (belts and fan) and hot engine surfaces. 1. Using EST, open the D_ContinuousMonitor.ssn. 2. Verify sensor voltage is within Key-On Engine-Off (KOEO) specifications. See "Performance Specifications" section of this manual. 3. Monitor sensor voltage. Verify an active Diagnostic Trouble Code (DTC) for the sensor. If code is inactive, monitor the Parameter Identifier (PID) while wiggling the connector and all wires at suspected location. If the circuit is interrupted, the PID spikes and the DTC will go active. If code is active, proceed to the next step. 4. Disconnect engine harness from sensor. NOTE: Inspect connectors for damaged pins, corrosion, or loose pins. Repair if necessary. 5. Connect breakout harness to engine harness. Leave sensor disconnected. Sensor Circuit Check Connect sensor breakout harness. Leave sensor disconnected. Turn the ignition switch to ON. Use EST to verify correct DTC goes active when corresponding fault is induced. Use DMM to measure circuits. Test Point Spec Comments EST - Check DTC DMM - Measure volts 2 to GND EST - Check DTC Short breakout harness across 2 and 3 DTC 3341 5 V ± 0.5 V DTC 3342 If DTC 3342 is active, check EBP signal for short to PWR If > 5.5 V, check VREF for short to PWR. If < 4.5 V, check VREF for OPEN or short to GND. Do Harness Resistance Check. If DTC 3341 is active, check EBP signal for OPEN. Do Harness Resistance Check. DMM - Measure resistance < 5 Ω If > 5 Ω, check SIG GND for OPEN. Do Harness Resistance Check. 1 to GND If checks are within specification, connect sensor and clear DTCs. If active DTC remains, replace sensor.
Page 6 of 8 EBP Pin-point Diagnostics EBP circuit diagram
Page 7 of 8 Connector Voltage Check Connect sensor breakout harness. Leave sensor disconnected. Turn ignition switch to ON. Use DMM to measure voltage. Test Point Spec Comment 1 to GND 2 to GND 3 to GND 0 V If > 0.25 V, check for short to PWR. 5 V If > 5.5 V, check VREF for short to PWR. If < 4.5 V, check VREF for OPEN or short to GND. Do Harness Resistance Check. 0 V If > 0.25 V, check for short to PWR. Do Harness Resistance Check. Connector Resistance Check to GND Turn ignition switch to OFF. Connect breakout harness. Leave sensor disconnected. Use DMM to measure resistance. Test Point Spec Comment 1 to GND < 5 Ω If > 5 Ω, check for OPEN circuit. 2 to GND > 1 kω If < 1 kω, check for short to GND. 3 to GND > 1 kω If < 1 kω, check for short to GND. Harness Resistance Check Turn ignition switch to OFF. Connect breakout box and breakout harness. Leave ECM and sensor disconnected. Use DMM to measure resistance. Test Point Spec Comment 1 to E-28 < 5 Ω If > 5 Ω, check SIG GND circuit for OPEN. 2 to E-35 < 5 Ω If > 5 Ω, check VREF circuit for OPEN. 3 to E-20 < 5 Ω If > 5 Ω, check EBP signal circuit for OPEN. EBP Circuit Operation
Page 8 of 8 The EBP sensor is a variable capacitance sensor supplied with a 5 volt reference voltage at Pin 2 from ECM Pin E-35. The sensor is grounded at Pin 1 from ECM Pin E-28. The sensor returns a variable voltage signal from Pin 3 to ECM Pin E-20. Fault Detection/Management The ECM monitors the internal BAP sensor as a baseline for zeroing the MAP and EBP signals. The ECM continuously monitors the control system. If the sensor signal is higher or lower than expected, the ECM disregards the sensor signal and uses a calibrated default value. The ECM sets a DTC, turns on the MIL, and runs the engine in a default range. The EGR valve closes and the ECM relies on the VGT pre-programmed values. Previous Next 2016 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.