D
Group 20
Step 4: Component and Function Checks
C2002641
Action: Refer to:
Check that the fuel quality is within specifications. Group 23: Fuel Quality, Checking
Check that the intake manifold pressure is according to specifications for the particular
horsepower variant at 100% engine load.
“Specifications” (Intake manifold pressure),
Information type “Specifications”, group 20.
Check charge air hoses and connections for damage, restrictions, or signs of engine
oil inside the piping.
Group 26: Charge Air Pipe, Checking
Check the charge air cooler for leaks, damage, or restrictions, including blockage at
the A/C condenser and radiator.
Group 26: Charge Air Cooler, Checking (Leak
Test)
Check the exhaust manifold and exhaust pipes. Check for damage, restrictions, and
unauthorized modifications.
“Intake and Exhaust System, Fault
Tracing”
(Checklist A), Information type
“Diagnostics”, group 2500.
Check that components such as the turbocharger, engine ECU, injectors, and EPG
shutter have the correct part number for the vehicle.
Group 21: Components, Checking
Check that the EGR valves function properly and are not stuck in an open or semi-open
position.
“EGR System, Fault Tracing” (Checklist R),
Information type “Diagnostics”, group 2547.
Check the EPG and AVU. Check the function, signal input, power supply, and air supply.
“Exhaust Pressure Governor, Fault
Tracing”
(Checklist E), Information type
“Diagnostics”, group 2538.
Check that the EPG shutter is free and has not become stuck in the closed or semi-closed
position.
“Exhaust Pressure Governor, Fault
Tracing”
(Checklist E), Information type
“Diagnostics”, group 2538.
Check that the valves and injectors are adjusted within specifications. Group 21: Valve and Injectors, Adjusting
Check that the oil pressure for the rocker arm shaft is within specifications when the
VCB is not active.
Group 21: Rocker Arm Shaft Oil Pressure,
Checking
Check that the adjustable timing gear is correctly torque-tightened. Check that the
camshaft is properly timed.
Group 21: Timing Gear, Adjustment
Check that the Variable Geometry Turbo is functioning properly and that the compressor
wheel and turbine wheel are not damaged (D16D).
"Variable Geometry Turbo (VGT), Fault Tracing"
(Checklist U), information type "Diagnostics",
Group 2551.
“Black Smoke” page 26
29
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