Service & Repair Manual

24-32
- Measure fuel pressure.
Specification: 3.8 to 4.2 bar
- If the specified value is not reached, replace
pressure regulator on a trial basis and repeat
pressure test.
- If the specified value is not reached again, check
Fuel Pump (FP) or supply line for damage (e.g.
pinched areas) and replace if necessary.
- If the specified value is exceeded, check return
line for damage (e.g. pinched areas) and replace
if necessary.
Note:
During the following test, the engine must not run
for an unnecessarily long period of time with the
vacuum hose removed. Otherwise, the higher
fuel pressure can cause enrichment of the fuel to
air ratio, which under some circumstances can
cause the oxygen sensor control limits to be
exceeded, causing a DTC to be stored.
- Start engine and let run at idle.
-
Switch of electrical consumers (A/C system
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