DME 7.8 DME 7.8 0 · 0-171P1501

DME 7.8 DME 7.8 0 0-171P1501 403 Throttle jacking unit, output stage - signal implausible Diagnosis conditions • Engine idling Possible fault cause ♦Short circuit in wiring harness ♦DME control module output stage faulty Affected terminals Terminal I/7 Note! The vehicle is in emergency air function mode, i.e. the engine is turning at approx. 1200 rpm. Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check wiring from DME ♦Connect special tool 9637 to 0 V Repair wiring har- control module Pin I/7 to wiring harness (DME control ⇒ Step 2 ness the throttle jacking unit module plug) → End for short circuit to B+ ♦Measure voltage between Pin I/ 7 and ground ♦Switch on the ignition 2 Check wiring from DME ♦Connect special tool 9637 to ∞ Ω Repair wiring har- control module Pin I/7 to wiring harness (DME control → End ness the throttle jacking unit module plug) → End for short circuit to ground ♦Measure resistance between Pin I/7 and ground 2470 P1501 0-171 page 1 Printed in Germany, 2000 p1501