Coolant temperature at least 85°C. The injector pump is OK.
Wash the outside of the hood and wipe dry. Unlock the service cover from the inside. Unlock bonnet -arrows- and pull forward slightly. Remove the hood and lay it with the side protected by the cover down. Detach hose -1- from mounting. Remove engine cover. Unscrew plug -arrow-.
Connect tandem pump tester -VAS 5187- as shown. Connect up diagnostic system -VAS 5051-. Start the engine and raise the speed to 1500 rpm. Observe pressure gauge readings: Prescribed value: at least 3.5 bar. If the specified value is not reached: replace the tandem pump.
After disconnecting the measuring device, tighten the plug to 25 Nm. The sealing ring must be replaced.
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