Volvo Symptom D12D US02 Service Manual page 89

Group 20
Step 4: Component and Function Checks
Action:
Check that there is no carbon monoxide in the fuel.
Check the fuel lines, seals, and connections. Check for leakage, damage, or restrictions.
Check that the fuel is the correct rated quality.
Check that the fuel supply pressure is within the specification from idle speed through to
full engine speed.
Check that the wiring harness for the engine ECU, including 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 for worn or damaged injectors.
Check that the intake manifold pressure sensor functions properly.
Check the EPG and the governor. Check the function, signal input, power supply, and
air supply.
Check fuel pump seals, valves, and shaft/gears for damage or wear.
Check that the coolant temperature sensor functions properly.
Check that the oil pressure for the rocker arm shaft is within specifications when VCB
is non-active.
"Engine Speed Surges Under Load or in Normal
Operating Range" page 73
D
C2002641
Refer to:
"Low Compression, Fault Tracing"
G), Information type "Diagnostics", group 2103.
Group 23: Fuel lines, check
Group 23: Fuel Quality, Checking
"Supply Pressure, Fault Tracing"
B), Information type "Diagnostics", group 2309.
"Engine ECU, Fault Tracing"
Information type "Diagnostics", group 2841.
Group 30: Wiring harness and terminal pin,
checking
VCADS Pro: Parameters, checking
"Cam and Flywheel Signals, Fault Tracing"
(Checklist H), Information type "Diagnostics",
group 2846.
Group 23: Unit injector, checking
"Intake and Exhaust System, Fault
Tracing"
(Checklist A), Information type
"Diagnostics", group 2500.
"Exhaust Pressure Governor, Fault
Tracing"
(Checklist E), Information type
"Diagnostics", group 2538.
"Supply Pressure, Fault Tracing"
B), Information type "Diagnostics", group 2309.
Group 28: Coolant temperature sensor, check
Group 25: Oil pressure in the rocker arm shaft,
checking
(Checklist
(Checklist
(Checklist M),
(Checklist
85