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 charge air system (including turbocharger, plus exhaust and intake side) is
free from engine oil.
“Intake and Exhaust System, Fault
Tracing”
(Checklist A), Information type
“Diagnostics”, group 2500.
Check the that components such as turbocharger, EECU, injectors, and EPG have
correct part number for the vehicle.
Group 21: Components, Checking
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 the condition of the intake and exhaust valve oil seals. Group 21: Valve Stem Oil Seals, Checking
Check that the valves and injectors are adjusted within specifications. Group 21: Valve and Injectors, Adjusting
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.
“Blue Smoke” page 26
Step 1: Fault Code Readings
C2002639
Active and inactive fault codes which are registered can
point to faults, but can also facilitate tracing the symptom.
Freeze frames with information for specific fault codes
can also assist in tracing causes of the symptom.
Fault tracing using relevant service information
must always be carried out for relevant fault codes.
Components/functions of special interest:
•
MID 128, Engine ECU
PID 27 EGR position sensor 1 (D12D)
PID 45 Preheater status
PID 111 Engine coolant level
PID 362 EGR position sensor 2 (D12D)
32
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