MBE 4000 DDEC VI Troubleshooting – Section 11.7 Faulty Turbocharger Control Unit

Section 11.7
Faulty Turbocharger Control Unit

To determine if an improper turbocharger control unit is causing excessive white smoke, inspect the turbocharger control unit for a leaking diaphragm, refer to MBE 4000 Service Manual (6SE420) , Chapter 6, Air Intake System.‪

1. If the control unit diaphragm is leaking replace the turbocharger; refer to MBE 4000 Service Manual (6SE420), Chapter 6, “Air Intake System — Turbocharger”.
2. Verify the replacement of the turbocharger and unit control corrected the excessive white smoke condition; refer to "11.7.1 Test Engine with Replaced Turbocharger and Control Unit" .

Section 11.7.1
Test Engine with Replaced Turbocharger and Control Unit

Perform the following to determine if replacing the turbocharger and control unit corrected the excessive white smoke condition:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Start the engine.
2. Run the engine speed to full load.
3. Visually inspect the exhaust for excessive white smoke.
   1. If the engine exhaust emission appears normal, no further troubleshooting is required. Shut down the engine.
   2. If the engine exhaust emission is excessive, shut down the engine, check for a restricted or cracked charge air cooler. Refer to "11.8 Restricted or Cracked Charge Air Cooler" .