Volvo Symptom D12D US02 Service Manual page 62

Group 20
Check the turbocharger compressor wheel for damage or signs of rubbing against
housing; also check end play.
Check that the engine ECU receives the correct signals from the flywheel and camshaft
sensors.
Check that the VCB control valve is regulating the proper oil pressure to the rocker arm
shaft when VCB is not active.
Check that the EGR cooler is not restricted (soot build-up).
Check that the valves and injectors are adjusted within specifications.
Check that the Variable Geometry Turbocharger is functioning properly (D16D).
"Gradual Loss of Power" page 49
58
D
Group 25: Turbocharger, Checking
"Cam and Flywheel Signals, Fault Tracing"
(Checklist H), Information type "Diagnostics",
group 2846.
Group 21: Rocker Arm Shaft Oil Pressure,
Checking
"EGR System, Fault Tracing"
Information type "Diagnostics", group 2547.
Group 21: Valve and Injectors, Adjusting
"Variable Geometry Turbo (VGT), Fault Tracing"
(Checklist U), Information type "Diagnostics",
Group 2551.
(Checklist R),