Volvo Symptom D12D US02 Service Manual page 44

Group 20
Step 4: Component and Function Checks
Action:
Check that the fuel quality is within specifications.
Check charge air hoses and connections for damage, restrictions, or signs of engine
oil inside the piping.
Check the charge air cooler for leaks, damage, or restrictions, including blockage at
the A/C condenser and radiator.
Check the exhaust manifold and exhaust pipes. Check for damage, restrictions, and
unauthorized modifications.
Check that components such as the turbocharger, engine ECU, injectors, and EPG
shutter have the correct part number for the engine.
Check the air compressor pumping time.
Check that A/C compressor is not constantly engaged.
Check that the correct calibration factor (K) is set in the VECU. (parameter MH)
Check that the injector trim codes corresponds to what's actually programmed into the
EECU.
Check that the EGR valves function properly and are not stuck in an open or semi-open
position.
Check the EPG and AVU. Check the function, signal input, power supply, and air supply.
"Exhaust Pressure Governor, Fault."
Check that the EPG shutter is free and has not become stuck in the closed or semi-closed
position.
Check that the valves and injectors are adjusted within specifications.
Check that the oil pressure for the rocker arm shaft is within specifications when the
VCB is not active.
Check that the adjustable timing gear is correctly tightened. Check that the camshaft is
properly timed.
Check that the engine fan deactivates according specifications (E-Viscous).
Check that the EECU receives the correct signals from the flywheel and camshaft
sensors.
Check that the Variable Geometry Turbo is functioning properly and that the compressor
wheel and turbine wheel are not damaged (D16D).
"High Fuel Consumption, Fault Tracing" page 36
40
C2002641
D
Refer to:
Group 23: Fuel Quality, Checking
Group 26: Charge Air Pipe, Checking
Group 26: Charge Air Cooler, Checking (Leak
Test)
Group 25: Exhaust Back Pressure, Checking
Group 20: Component Check
Group 56: Air Compressor, Checking
Group 87: Air Conditioning (A/C), Checking
VCADS Pro: Parameters, checking
VCADS Pro: Parameters, checking
"EGR System, Fault Tracing"
Information type "Diagnostics", group 2547.
"Exhaust Pressure Governor, Fault
Tracing"
(Checklist E), Information type
"Diagnostics", group 2538.
"Exhaust Pressure Governor, Fault
Tracing"
(Checklist E), Information type
"Diagnostics", group 2538.
Group 21: Valve and Injectors, Adjusting
Group 25: Oil Pressure in Rocker Arm Shaft,
Checking
Group 21: Timing Gear, Adjustment
"Fan, Fault Tracing" (Checklist T), Information
type, "Diagnostics", Group 2631.
"Cam and Flywheel Signals, Fault Tracing"
(Checklist H), Information type "Diagnostics",
group 2846.
"Variable Geometry Turbo (VGT), Fault Tracing"
(Checklist U), Information type "Diagnostics",
Group 2551.
(Checklist R),