96-27Fault code 21 · W lead (DME - immobilizer), open circuit

911 Turbo (996) Alarm system I 48 96 96-27Fault code 21 W lead (DME - immobilizer), open circuit Diagnostic conditions • Ignition on Possible cause of fault ♦Short circuit to ground/open circuit in the communication lead between the alarm system control module and the DME control module Affected terminals Plug A, terminal 23 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check wire from the ♦Switch off ignition ∞ Ω Repair wiring har- alarm system control ⇒ Step 2 ness ♦Pull plug A off the alarm system module to the DME con- → End control module trol module for short to ♦Pull plug A off the DME control ground. module ♦Measure resistance between plug A on alarm system control module pin 23 and ground 2 Check wire from the ♦Measure resistance between < 5 Ω Repair wiring har- alarm system control plug A on alarm system control ⇒ Step 3 ness module to the DME con- module pin 23 and plug A on → End trol module for open cir- DME control module pin 3 cuit 3 ♦Replace DME control module as a test → End 9601 Fault code 21 96-27 page 1 Printed in Germany – 4, 2001 21xxxi48