MBE 4000 DDEC VI Troubleshooting – Section 11.2 Faulty Turbocharger Boost Sensor

Section 11.2
Faulty Turbocharger Boost Sensor

To determine if a faulty turbocharger boost sensor is causing excessive white smoke, perform the following:‪

1. Check the condition of the boost air combination sensor (look for cracks, corrosion, missing or bent pins).
2. Resolve the faulty turbocharger boost sensor; refer to "11.2.1 Turbocharger Boost Sensor Resolution" .

Section 11.2.1
Turbocharger Boost Sensor Resolution

Perform the following steps to resolve a faulty turbocharger boost sensor:‪

1. Disconnect harness connection from turbocharger boost sensor and remove two bolts securing the boost sensor to the air intake manifold. Discard sensor.
2. Secure the turbocharger boost sensor to the air intake manifold with two bolts. Torque bolts to 11 N·m (96 lb·in.).
3. Connect the harness connector to the boost sensor.
4. Verify the turbocharger boost sensor resolution; refer to "11.2.1.1 Test Engine with Replace Turbocharger Boost Sensor" .

Section 11.2.1.1
Test Engine with Replace Turbocharger Boost Sensor

Perform the following to determine if replacing the turbocharger boost sensor 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 malfunctioning air intake (grid) preheater. Refer to "11.3 Malfunctioning Air Intake (Grid) Preheater" .