DME 7.8 DME 7.8 0 · 0-36.5P0175

DME 7.8 DME 7.8 0 0-36.5P0175 Oxygen Sensing Adaptation, Idle Range, Bank 2 – 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 ♦EVAP canister purge valve open Affected terminals - Diagnosis/Troubleshooting Note! ♦If DTC P0445 (fuel tank vent valve - short to ground) is stored, correct this fault first. An open EVAP canister purge valve can lead to the lean threshold being reached. ♦For vehicles in the USA, the upper load range will probably not be reached. The only case in which a fault could be stored is during driving while towing a trailer or caravan on a hill. ♦Contrary adaptation values in connection with misfiring point to incorrectly adjusted control times check con- trol times and adjust if necessary. ♦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 P0175 0-36.5 page 1 Printed in Germany – 6, 2002 p0175