DME 7.8 DME 7.8 0 · Affected terminals

DME 7.8 DME 7.8 0 Affected terminals - Diagnosis/troubleshooting Note! ♦Air leaks ahead of the oxygen sensors can lead to a fault in adaptation ⇒Check exhaust system for leaks. ♦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. ♦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 exhaust system for leaks 3 Check for air leaks in intake air system 4 Check fuel pressure 5 Check volume supply of fuel pump 6 Fuel injectors fouled ♦If preceding Check Points were negative, the fuel injectors may be fouled ♦Clean fuel injectors (ultrasonic cleaning device) or replace them 2469 P1125 0-113 page 3 Printed in Germany – 1, 2000 p1125