91 PCM 2 / CDR 23 911 Turbo (996) · Diagnosis/troubleshooting

91 PCM 2 / CDR 23 911 Turbo (996) Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Reading out CDR23 ♦Connect the Porsche System Tester II The fault is remedied. Fault code is still fault memory No. 9588 to the diagnostic socket; → End displayed. switch on the ignition and the Porsche Step 2 System Tester ll No. 9588. ♦Select vehicle type 911 (996) and start the automatic control module search. ♦In the Control units menu, select 'CDR23'. ♦Click the > > key in the 'Fault mem- ory' menu. ♦Read out fault memory. ♦Erase fault memory. ♦Remove ignition key and switch on ignition again. ♦Read out fault memory. ♦Extract ambient data, press the >> key. 2 Checking MOST ♦In the Control units menu, select ♦CDR23 > ampli- An optical fault is components 'CDR23'. fier 'optically displayed. ♦Click 'MOST components check' in the OK''electrically 3 OK.' An electrical fault is function selection menu and start it displayed. with the >> key. ♦Amplifier > CD 4 ♦Wait for the end of the automatic changer 'opti- cally OK''electri- check. cally OK.' ♦The duration of the check depends on ♦CD changer > the number of existing MOST control CDR23 'optically modules. OK''electrically ♦Press the >> key. OK.' ♦ 3 Optical fault Replace the relevant optical waveguide Replace the faulty Replace the rele- between the listed faulty components with optical wavelength vant receiving the optical waveguide test line No. 9712 with the relevant MOST control mod- that is provided as a special tool. Check spare part. ule. MOST components again. → End Step 2 91-149 page 2 9101 8007 CDR23 8007CRlwl Printed in Germany – 29, 2002