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3535

OBD and Fuel Supply

Pierburg | Motorservice

What is the cause for diagnostic trouble codes P0005, P0006, P0007, P0087, P0172, P0441, P0462 and P0463? They can be identified with an on-board diagnostic system (OBD) and indicate a fault within the fuel supply of a vehicle. You can find out the causes of these faults and the possible remedies here. 

3535
PIERBURG PRODUCTS ON-BOARD DIAGNOSTICS
01 Fuel delivery module (in-tank) 10 Engine control unit
02 Fuel level sensor 11 Malfunction indicator lamp (MIL)
03 Active carbon filter shut-off valve 12 Diagnostic plug
04 Activated carbon filter regeneration valve 13 OBD data scan tool
05 Fuel pump (in-line)
06 Fuel filter (Kolbenschmidt)
07 Fuel check valve
08 Tandem pump, fuel/vacuum
09 Fuel pressure regulators

FROM PRACTICAL USE

3536
Scorching due to dry running
3538
Blocked sieve filter and new condition
3537
Rusted pump inlet (water damage)
3539
Contact corrosion

FINDING AND REMEDYING FAULTS

DIAGNOSTIC TROUBLE
CODE
P0005/P0006/P0007 P0087 P0172
DISPLAYED FAULTS Fuel cut-off solenoid valve – open circuit;
signal too high/too low

• Fuel cut-off solenoid valve defective
• Plug-in connection defective, cable
interrupted
Fuel rail/system pressure too low
• Fuel pump/fuel pressure regulator
defective
• Fuel supply line/fuel filter blocked
• Filter on intake side of pump (in case of
retrofitting/replacement)
Mixture too rich
• Activated carbon filter solenoid valve stuck
(permanently open): Fuel-enriched air from
the activated carbon filter is drawn into the
intake air system
• Diaphragm of the pneumatic fuel pressure
regulator leaking: Fuel is drawn into the
intake air system through the vacuum line
• Stuck/carbonised EGR valve is always open
NEXT STEPS/
POSSIBLE REMEDIES
• Measure power supply/wiring harness,
replace if necessary
• Check fuel cut-off solenoid valve,
replace if necessary
• Check fuel pump/fuel pressure regulator,
replace if necessary
• Check fuel supply line/fuel filter,
replace if necessary
• Remove filter that may be fitted on the
intake side of the pump
• Check ACF solenoid valve, replace if
necessary
• Check fuel pressure regulator, replace if
necessary
• Check EGR valve:
-- If the EGR valve is always open, exhaust
gas is recirculated permanently
-- If the EGR valve is stuck, replace and find
out the causes of the sticking
DIAGNOSTIC TROUBLE
CODE
P0441 P0462/P0463
DISPLAYED FAULTS Fuel vapour collecting system – incorrect flow
rate

• Leakage in activated carbon filter system
(ACF system), e.g. hose connections
leaking
• ACF solenoid valve stuck (permanently
open)
Fuel level sensor – input signal too low/too
high

• Sender unit shows that fuel level is too low
• Engine shuts off automatically or does not
start
NEXT STEPS/
POSSIBLE REMEDIES
• Examine ACF system for leakage,
e.g. by checking hose connections,
replace if necessary
• Check ACF solenoid valve, replace if
necessary
• Check sender unit or module with sender
unit, replace if necessary

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