P0401-EGR SYSTEM PERFORMANCE
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1 P0401-EGR SYSTEM PERFORMANCE P0401-EGR SYSTEM PERFORMANCE 1/6
2 For a complete wiring diagram Refer to the Wiring Information. Theory of Operation Exhaust gas recirculation is a method of reducing emissions of oxides of nitrogen. As the inert exhaust gas is recirculated, the mixture absorbs heat in the combustion chamber without interacting with the fuel/air mixture and reduces the formation of NOx emissions. After the EGR monitor conditions are met, the EGR valve is turned on and off momentarily. The EGR monitor calculated the difference in engine roughness from the EGR off condition to the EGR condition. This engine combustion stability difference as measured by engine roughness is the measure of a functional EGR system. When Monitored: Engine running for greater than two minutes with the Engine Coolant Temp greater than 70 C (158 F). EGR active. Less than 8500 feet. Ambient temperature greater than -6 C (20 F). Set Condition: The PCM closes the EGR valve while monitoring the O2 Sensor signal. Once a closed EGR fueling sample has been established the PCM then ramps in EGR and additional fueling while monitoring the O2 sensor signal in the open state. A fueling sample is again established. The PCM then compares the different O2 Sensor signal readings (fueling samples). If a larger than expected variation is detected, a soft failure is recorded. Three soft failures set a one trip failure. After two failed trips, a DTC is set and the MIL is illuminated. Possible Causes (Z958) EGR SOLENOID GROUND CIRCUIT OPEN (K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE (K35) EGR SOLENOID CONTROL CIRCUIT OPEN EGR SOLENOID ASSEMBLY POWERTRAIN CONTROL MODULE (PCM) Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC- Based Diagnostics/MODULE, Powertrain 1.ACTIVE DTC NOTE: Diagnose and repair any EGR circuit DTCs before continuing with this procedure. 1. Turn the ignition on. 2. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. 3. Start the engine and allow it to reach operating temperature. NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. 4. With a scan tool, select View DTCs. 2/6
3 Is the DTC Active or Pending at this time? Go To 2 Refer to the INTERMITTENT CONDITION Diagnostic Procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain 2.ROUGH IDLE OR STALLING AT IDLE 2. Turn all accessories off. 3. Start the engine. Does the engine run rough or stall at idle? Go To 3 Go To 5 3.EGR VALVE ASSEMBLY CONTROL CIRCUIT 2. Disconnect the EGR Valve Assembly harness connector. 3. Start the engine. Does the engine continue to run rough or stall with the EGR Valve Assembly connector disconnected? Go To 8 Go To 4 4.(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE 3/6
4 2. Disconnect the C1 and C2 PCM harness connectors. 3. Disconnect the EGR Solenoid harness connector. 4. Ignition on, engine not running. 5. Measure the voltage on the (K35) EGR Solenoid Control circuit in the EGR Solenoid connector. Is there any voltage present? Repair the short to voltage in the (K35) EGR Solenoid Control circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure). Go To 9 5.EGR SYSTEM TEST 1. Turn all accessories off. 2. Start the engine and allow it to reach operating temperature. 3. With the scan tool, perform the EGR System Test. 4. Select OPEN to open the EGR valve. Did the engine run rough or stall when the valve was opened during the system test? Go To 8 Go To 6 6.(Z958) EGR SOLENOID GROUND CIRCUIT OPEN 2. Using a 12-volt test light connected to battery voltage, probe the (Z958) EGR Solenoid ground circuit in the EGR Solenoid harness connector. Does the 12-volt test light illuminate brightly? 4/6
5 Go To 7 Repair the open in the (Z958) EGR Solenoid ground circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure). 7.(K35) EGR CONTROL CIRCUIT HIGH RESISTANCE 2. Connect the EGR Valve Assembly connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 along with the Adapter to perform the diagnosis. 3. Using a voltmeter, perform a voltage drop test by backprobing the (K35) EGR Control circuit at the EGR Valve Assembly harness connector and probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter. 4. Start the engine and allow it to reach operating temperature. 5. With the scan tool, perform the EGR System Test. 6. Select OPEN to open the EGR valve. 7. Monitor the circuit voltage on the voltmeter. Is the voltage below 0.5 volts when the valve was opened during the system test? Go To 8 Repair the excessive resistance in the (K35) EGR Control circuit. 8.EGR VALVE ASSEMBLY WARNING: The normal operating temperature of the EGR system is very high. Never work around or attempt to service any part of the EGR system until it has cooled. Failure to follow these 5/6
6 instructions can result in possible serious or fatal injury. 1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve Assembly and the Powertrain Control Module (PCM). 2. Verify that there is good pin to terminal contact in the Solenoid and Powertrain Control Module connectors. 3. Look for any chafed, pierced, pinched, or partially broken wires. 4. Look for broken, bent, pushed out or corroded terminals. 5. Refer to any Technical Service Bulletins that may apply. 6. Inspect the EGR Valve Assembly for the following: 7. - Proper mounting, leaking gasket(s) 8. - Damaged, leaking, or obstructed EGR tube(s) 9. - Carbon build up on or near the EGR pintle or within passages. Were any problem found? Repair or replace the EGR system components as necessary. Replace the EGR Valve Assembly. 9.POWERTRAIN CONTROL MODULE (PCM) 1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Solenoid Assembly and the Powertrain Control Module (PCM). 2. Look for any chafed, pierced, pinched, or partially broken wires. 3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Solenoid and Powertrain Control Module connectors. 4. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Repair as necessary. Replace and program the Powertrain Control Module per Service Information. Portions of materials contained herein are sourced from Chrysler Corporation. Copyright Service Repair Solutions, Inc. 6/6
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