Work instruction Display OK If not OK · 4 Checking open cir- Check

91 911 Turbo (996) PCM 2 / CDR 23 Work instruction Display OK If not OK 4 Checking open cir- Check diagnosis distribution line between < 0.5 Ω Remove open cir- cuit in diagnosis dis- the listed faulty components for an open Step 5 cuit in diagnosis tribution line circuit. distribution line. → End ♦Switch off ignition. ♦Disconnect the plug connections from the existing MOST control modules. ♦Measure the resistance of the diagno- sis distribution line between the rele- vant plug connections. 5 Checking diagnosis Check diagnosis distribution line between ∞ Ω Remove short cir- distribution line for the listed faulty components for short cir- Step 6 cuit to ground in short circuit to cuit to ground. diagnosis distribu- ground tion line. ♦Switch off ignition. → End ♦Disconnect the plug connections from the existing MOST control modules. ♦Measure the resistance of the diagno- sis distribution line to the ground body. 6 Checking diagnosis Check diagnosis distribution line between 0 V Remove short cir- distribution line for the listed faulty components for short cir- Step 7 cuit to B+ in diag- short circuit to B+. cuit to B+. nosis distribution line. ♦Switch off ignition. → End ♦Disconnect the plug connections from the existing MOST control modules. ♦Measure the voltage of the diagnosis distribution line to the ground body. ♦Switch ignition on. 7 Replacing PCM2 → End 9101 8007 CDR23 91-149 page 3 Printed in Germany – 29, 2002 8007CRlwl