Inspection And Verification

WARNING: This page is about a different variant/trim than selected.

WARNING: Make sure that all suitable safety precautions are observed when carrying out any work on the fuel system. Failure to observe this warning may result in personal injury.

CAUTION:

Make sure that absolute cleanliness is observed when working with these components. Always install blanking plugs to any open orifices or lines. Failure to follow this instruction may result in damage to the vehicle.
Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.

NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

Verify the customer concern.
Visually inspect for obvious signs of mechanical or electrical damage.

VISUAL INSPECTION

MECHANICAL	ELECTRICAL
Low/Contaminated fuel Fuel supply/return line(s) High-pressure fuel supply line(s) Fuel tank and filler pipe Fuel leak(s) Fuel filler cap Fuel filter Push connect fittings Fuel rail Fuel pump Exhaust gas recirculation system	Fuses Glow plug indicator Inertia fuel shut off switch Fuel pump module Sensor(s) Powertrain control module Fuel volume control valve Fuel pressure control valve Fuel rail pressure sensor Fuel temperature sensor Fuel injector(s) Exhaust gas recirculation system

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Code(s) (DTC)s and refer to the DTC Index.