SPN 2631/FMI 2
This diagnosis is typically Turbocharger Boost System Performance.
Low Boost Performance
Check as follows:
- Inspect the air filter and air inlet piping to turbocharger for blockage, or leaks.
- Check VPOD for correct part number and proper air line supply installation, and configuration (PWM 10” in MCM Group PGR001_Prop Valve must be configured to “turbo control). Is the VPOD installed and configured correctly?
- Perform CAC inspection and leak test. Refer to OEM literature for procedure.
Note: Be sure to also inspect turbo inlet seal, intake manifold and EGR hoses and clamps
- If inspection and/or leak test fail, repair as necessary.
- If CAC inspection passes, go to step 4 .
- Using the AMA service routine, select “Set fault” and perform an air mass adaptation.
- Shut engine OFF, turn the ignition ON.
- Check EGR valve operation. Using activate outputs service routine command PWM1 to 50% while monitoring EGR actual position. Does EGR actual position read between 47-54%?
- Command PWM1 to 90% while monitoring EGR actual position. Does EGR actual position read between 87-94%?
- Turn ignition OFF.
- Disconnect EGR valve harness connector.
- Inspect the connector for damaged or corroded pins.
- If damage is found, repair as necessary.
- If no damaged pins are found, go to step 11 .
- Remove the EGR valve, inspect valve for heavy soot or coolant contamination or leakage.
- If contamination is found, repair root cause as necessary, and replace the EGR valve.
- If no contamination is found, replace the EGR valve.
- With Ignition ON engine OFF, compare the intake manifold to compressor inlet pressure. Are the pressure’s within 0.6 psi of each other?
- Yes, go to step 13 .
- No, replace suspect sensor.
- Check inlet air Delta P sensor, with Ignition ON engine OFF. Does the inlet air Delta P pressure read 0?
- Yes, go to step 14 .
- No, remove and inspect the inlet air Delta P sensor including the systek sensor, look for damaged O-rings or plugged orifices. If no damage is found, replace the inlet air Delta P sensor.
- Start the engine.
- Check VPOD (Wastegate) operation by performing the following:
- Using activate outputs service routine, command PWM 10 to 30%. No movement of wastegate actuator rod should be seen.
- Command PWM 10 to 70%, wastegate actuator rod should begin to move.
- Command PWM 10 to 90%, wastegate actuator rod should be fully open. Go to step 16 .
- If actuator fails to move, verify air supply pressure equals truck air pressure. If pressure is OK replace VPOD.
- Check Brakegate actuator by performing the following:
- Using activate outputs service routine command SW 4 to ON then OFF.
- If the actuator is fully extended when ON and fully retracted when OFF, go to step 17 .
- If actuator does not operate, verify air supply if OK inspect brakegate and actuator arm.
- Perform a parked regeneration.
- After regen completes, monitor DPF Inlet pressure while at 1500 rpm no load. Is the DPF inlet pressure greater than 2 psi?
- Yes, remove and inspect DOC and DPF for blockage/obstruction. If found replace suspect component as necessary.
- No, obtain a DDDL log file showing the active code and contact the Detroit Diesel Customer Support Center (313–592–5800).
|EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568|
|Generated on 10-13-2008|