DME 7.8 DME 7.80 · Work instruction Display OK

DME 7.8 DME 7.80 Work instruction Display OK If not OK 3 Check fuel pressure regu- ♦Remove vacuum hose from fuel 0.4 - 0.6 bar Check the intake air lator, vacuum connection pressure regulator system for leaks and fuel return line and check vacuum ♦Connect special tool 9103/2 to line to fuel pressure vacuum hose regulator for restric- ♦Start the engine tions. ♦ ♦Check housing of fuel pressure Replace the fuel regulator for damage and defor- pressure regulator if mation it is damaged with the result that the spring pre-tension- ing is increased 4 Check fuel injectors for leaks 356 Oxygen Sensing Adaptation, Lower Load Range, Bank 1 - Above Limit Diagnosis conditions • Oxygen sensing system active • Time elapsed after engine start-up: 250 to 350 seconds (USA) • Time elapsed after engine start-up: 302 to 402 seconds (RoW) • Engine temperature greater than 60 °C Possible fault cause ♦Incorrect signal from MAF sensor ♦Intake air system leaking ♦Fuel pressure too low ♦Volume supply of fuel pump too low ♦Fuel injectors fouled Affected terminals - Diagnosis/troubleshooting 0-114 page 2 2469 P1126 p1126 Printed in Germany – 1, 2000