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Fault code 21: Diagnosis/troubleshooting

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 21)

Work instruction Display OK If not OK
1 Check wire from the alarm system control module to the DME control module for short to ground.
  • Switch off the ignition.
  • Pull plug A off the alarm system control module.
  • Pull plug A off the DME control module.
  • Measure resistance between plug A on alarm system control module pin 23 and ground.
 Step 2 Repair wiring harness.
-> End
2 Check wire from the alarm system control module to the DME control module for open circuit.
  • Measure resistance between plug A on alarm system control module pin 23 and plug A on DME control module pin 3.
 < 5
Step 3		 Repair wiring harness.
-> End
3
  • Replace DME control module as a test.
 -> End
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