Volvo Symptom D12D US02 Service Manual page 83

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 the fuel supply pressure is within the specification from idle speed through to
full engine speed.
Check power supply and ground for engine ECU.
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 control unit receives the correct signals from the flywheel and
camshaft sensors.
Check for worn or damaged injectors.
Check that the coolant temperature sensor functions properly.
Check that the intake manifold pressure sensor functions properly.
Check that the adjustable timing is correctly timed and torqued.
Check the EPG and AVU function, signal input, power supply and air supply.
"Engine Speed Surges at Low or High Idle" page 73
D
C2002641
Refer to:
Group 23: Air in the Fuel System, Checking
Group 23: Fuel Quality, Checking
Group 23: Fuel pressure, checking
"Engine ECU, Fault Tracing"
Information type "Diagnostics", group 2841.
Group 30: Wiring harness and terminal, checking
VCADS Pro: Parameters, checking
"Cam and Flywheel Signals, Fault Tracing"
(Checklist H), Information type "Diagnostics",
group 2846.
Group 23: Unit injector, checking
Group 28: Coolant temperature sensor, check
"Intake and Exhaust System, Fault
Tracing"
(Checklist A), Information type
"Diagnostics", group 2500.
Group 21: Camshaft timing, checking
"Exhaust Pressure Governor, Fault Tracing"
(Checklist E), Information type "Diagnostics",
Group 2538.
(Checklist M),
79