Volvo Symptom D12D US02 Service Manual page 80

Group 20
Step 4: Component and Function Checks
Action
Check for air in the fuel system.
Check that the fuel quality is within specifications.
Check that there is no carbon monoxide in the fuel.
Check (with external pressure gauge) that the fuel supply pressure is within the
specification from idle speed through to full engine speed.
Check the fuel lines, seals, and connections. Check for leakage, damage, or restrictions.
Check that the wiring harness for the engine ECU, including the connectors and terminal
pins, is fault free and properly connected.
Check that injector trim codes correspond to injector codes.
Check that the engine ECU receives the correct signals from the flywheel and camshaft
sensors.
Check that the EGR valves function properly and are not stuck in an open or semi-open
position.
Check for worn or damaged injectors.
Check the fuel pump seals, valves, and shaft/gears for damage or wear.
Check that the oil pressure for the rocker arm shaft is within specifications when the
VCB is non-active.
Check that the timing gear is properly installed. Check that the camshaft is correctly set.
"Engine Runs Unevenly at Idle Speed" page 73
76
D
C2002641
Refer to:
Group 23: Air in the Fuel System, Checking
Group 23: Fuel Quality, Checking
"Low Compression, Fault Tracing"
G), Information type "Diagnostics", group 2103.
"Supply Pressure, Fault Tracing"
B), Information type "Diagnostics", group 2309.
Group 23: Fuel lines, check
"Engine ECU, Fault Tracing" (Checklist M), Impact
or ID DVD: Information type "Diagnostics", Group
2841.
VCADS Pro: Parameters, checking
"Cam and Flywheel Signals, Fault Tracing"
(Checklist H), Information type "Diagnostics",
group 2846.
"EGR System, Fault Tracing"
Information type "Diagnostics", group 2547.
Group 23: Unit injector, checking
"Supply Pressure, Fault Tracing"
B), Information type "Diagnostics", group 2309.
Group 25: Oil pressure in the rocker arm shaft,
checking
Group 21: Timing gear adjustment
(Checklist
(Checklist
(Checklist R),
(Checklist