Volvo Symptom D12D US02 Service Manual page 10

Group 20
Engine Unexpectedly Shuts Down During Deceleration
•
Lack of communication with, or power to, the Engine
ECU.
•
Abnormal fuel supply pressure during deceleration or
idle.
•
Air in the fuel during deceleration or idle.
The following checks should be performed in order until
the fault is found. These checks also can help exclude
components with no faults or malfunctions. The amount
and sequence of checks depend on results from Basic
Checks (including active or inactive fault codes noted),
vehicle conditions, vehicle service and repair history,
other symptoms, and information from the driver.
Engine Cuts Out Intermittently
The fuel supply to the engine is interrupted, perhaps due
to:
•
Intermittent electrical faults in components related to
the fuel system or electronic control units (such as the
accelerator pedal and injectors).
The following checks should be performed in order until
the fault is found. These checks also can help exclude
components with no faults or malfunctions. The amount
and sequence of checks depend on results from Basic
Checks (including active or inactive fault codes noted),
vehicle conditions, vehicle service and repair history,
other symptoms, and information from the driver.
Engine Does Not Shut Off
Engine does not stop immediately after the ignition key is
moved to the OFF position. This is probably due to:
•
Faults in the communication between the vehicle ECU
and the engine ECU.
The following checks should be performed in order until
the fault is found. These checks also can help exclude
components with no faults or malfunctions. The amount
and sequence of checks depend on results from Basic
Checks (including active or inactive fault codes noted),
vehicle conditions, vehicle service and repair history,
other symptoms, and information from the driver.
6
D
•
"Step 1: Fault Code Readings" page 17
•
"Step 2: Visual Inspection (System Checks)" page 18
•
"Step 3: VCADS Pro Tests" page 18
•
"Step 4: Component and Function Checks" page 19
"Start and Stop Problems, Fault Tracing" page 4
•
"Step 1: Fault Code Readings" page 20
•
"Step 2: Visual Inspection (System Checks)" page 21
•
"Step 3: VCADS Pro Tests" page 21
•
"Step 4: Component and Function Checks" page 22
"Start and Stop Problems, Fault Tracing" page 4
•
"Step 1: Fault Code Readings" page 22
•
"Step 2: Visual Inspection (System Checks)" page 23
•
"Step 3: VCADS Pro Tests" page 23
•
"Step 4: Component and Function Checks" page 24
"Start and Stop Problems, Fault Tracing" page 4