OBD and Fuel Supply
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.
| 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
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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