Volvo Symptom D12D US02 Service Manual page 68

Group 20
Step 4: Component and Function Checks
Action:
Check that components (i.e. turbocharger, EECU, VECU, injectors, and EPG) have
correct part number; if EECU or VECU was replaced, verify that new unit was
programmed correctly.
Check for air in the fuel system.
Check that the intake manifold pressure is within specifications under loaded conditions.
Check that the fuel supply pressure is within specifications from idle speed to the rated
engine speed.
Check that the exhaust back pressure is within specifications.
Check that the wiring harness connectors are properly installed.
Check the power supply/ground and wiring harness for engine ECU, including connectors
and terminal pins for damage or oxidation.
Check that the injector trim codes correspond to the injector codes.
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 valves and injectors are adjusted within specifications.
"Low Power After Vehicle Repair" page 50
64
D
C2002641
Refer to:
Group 20: Components, Checking
"Cylinder Balancing, Fault Tracing"
(Checklist F), Information type "Diagnostics",
group 2111.
"Intake and Exhaust System, Fault
Tracing"
(Checklist A), Information type
"Diagnostics", group 2500.
"Supply Pressure, Fault Tracing"
B), Information type "Diagnostics", group 2309.
Group 25: Exhaust Back Pressure, Checking
"Engine ECU, Fault Tracing"
Information type "Diagnostics", group 2841.
Group 30: Wiring, connectors, and terminal pin,
checking
VCADS Pro: "Parameters programming"
"Cam and Flywheel Signals, Fault Tracing"
(Checklist H), Information type "Diagnostics",
group 2846.
Group 21: Rocker Arm Shaft Oil Pressure,
Checking
Group 21: Valve and Injectors, Adjusting
(Checklist
(Checklist M),