Volvo Symptom D12D US02 Service Manual page 57

Group 20
Step 3: VCADS Pro Tests
Action:
Check sensor values.
Note: Loss of power can occur if one or more of the sensors show
abnormal values.
Check accelerator pedal and switches.
Check start and warm-hold function.
Note: Make sure the start and warm hold function is working properly.
Power loss can occur if the start and warm hold function is erroneously
activated.
Check fuel supply pressure at low and high engine speeds.
Check EGR function.
Check cylinder balancing.
Check cylinder compression.
Check injector function.
Check intake/exhaust system.
Check engine fan function.
Other VCADS Pro tests which require test drive or dynamometer test:
Check fuel supply pressure under full load.
Check intake manifold pressure at full load to verify that it is within specifications.
Check that response time at full engine load is within specifications.
Check that the Variable Geometry Turbocharger is functioning properly (D16D).
"Step 4: Component and Function Checks" page 54
C2002640
D
Refer to:
•
"Sensor Values Check, (Engine
Running)"
•
"Sensor Values Check, (Engine Not
Running)"
Accelerator Pedal, Switches and Sensors, Check
Warm-Hold Function, Test
Fuel Supply Pressure, Check
EGR Function, test
Cylinder balancing, Check
Cylinder Compression, Test
Unit Injector Cut-Out
Intake and Exhaust System, Check
Engine Cooling Fan, Test
Fuel Supply Pressure, Check
Intake Manifold Pressure Check, Test Drive
Response, Test Drive
Variable Geometry Turbocharger Function, Check
(D16)
"Sudden Loss of Power" page 49
53