Faulty Constant Throttle Valve Solenoid
To determine if a faulty constant throttle valve CTV solenoid is causing excessive black or gray smoke, measure the resistance between wire 52 in the 55-pin connector and vehicle ground.
- If the resistance is greater than 30 kΩ, replace the constant throttle valve; refer to MBE 4000 Service Manual (6SE420), Chapter 1, “Engine, — Engine Brake, CTV solenoid”. Verify the replacement of the CTV solenoid; refer to "9.13.1 Test Engine for Replaced CTV Solenoid" .
- If the resistance is less than 30 kΩ, refer to "9.14 Improper Valve Clearance, Worn or Damaged Camshaft Lobes and Rollers" .
Test Engine for Replaced CTV Solenoid
Perform the following steps to determine if the replaced CTV solenoid resolved the excessive exhaust smoke condition:
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.
- Start and run the engine.
- Run the engine at idle under no-load conditions for approximately five minutes, allowing the engine coolant to reach normal operating range, approximately 88-96°C (190-205°F).
- Visually inspect exhaust for excessive smoke.
- If the engine smoke emission appears normal, no further troubleshooting is required. Shut down the engine.
- If the engine exhaust smoke is excessively black or gray, shut down the engine. Refer to "9.14 Improper Valve Clearance, Worn or Damaged Camshaft Lobes and Rollers" .
|EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568|
|Generated on 10-13-2008|