DME 7.8 DME 7.80 · 96 EVAP canister shutoff valve (output stage) - under

DME 7.8 DME 7.80 96 EVAP canister shutoff valve (output stage) - under limit Diagnosis conditions • Engine running • Battery voltage greater than 7 V • Fuel tank ventilation active Possible fault cause ♦Wiring harness ♦DME control module faulty Note! Fuel tank ventilation can be activated with the Porsche System Tester 2 in the ’Short test’ menu. Affected terminals Terminal IV/30 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check triggering wire for ♦Remove front right-hand wheel ∞ Ω Repair wiring har- shutoff valve for short to housing liner ⇒ Step 2 ness ground → End ♦Remove connector of shutoff valve ♦Remove DME control module connector ♦Measure resistance between shutoff valve plug Pin 1 and ground ♦Switch on the ignition 2 Replace DME control module ⇒ Step 3 3 Perform adaptation ♦Switch on the ignition → End ♦Wait one minute ♦Do not press the accelerator ♦Switch off the ignition for at least 10 seconds ♦Read out the fault memory 0-71 page 2 2093 P0448 p0448 Printed in Germany, 2000