DME 7.8 DME 7.8 0 · 0-115P1127

DME 7.8 DME 7.8 0 0-115P1127 418 Oxygen Sensing Error by means of Short Test, Bank 1 - Below Limit Diagnosis conditions • Mixture adaptation performed with the Porsche System Tester 2 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. 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 P1127 0-115 page 1 Printed in Germany – 1, 2000 p1127