DME 7.8 DME 7.8 0 · 0-114P1126

DME 7.8 DME 7.8 0 0-114P1126 356 Oxygen Sensing Adaptation, Lower Load Range, Bank 1 - Below 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 ♦Fuel pressure too high ♦Fuel injector leaking Affected terminals - Diagnosis/troubleshooting Note! ♦If DTC P0445 (EVAP canister purge valve - short to ground) is stored in the memory, correct this fault first. An open EVAP canister purge valve can lead to the lean threshold being reached. ♦If the fuel tank reserve light is switched on, no fault is entered. Work instruction Display OK If not OK 1 Check signal from MAF ♦Connect special tool 9637 0.9 to 1.1 V Replace MAF sensor sensor ♦Measure voltage at pin III/23 and ground ♦Switch on the ignition ♦Start the engine approx. 1.4 V 2 Check fuel pressure 2469 P1126 0-114 page 1 Printed in Germany – 1, 2000 p1126