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 Checking battery ♦Examine battery. Step 2 Charge or replace battery. → End 2 Checking fuse ♦Check fuse D 8 to the PCM2. Step 3 Replace fuse. → End 3 Checking supply voltage ♦Switch off ignition. Battery voltage. Corrosion in the pin 30 ♦Remove plug A from PCM2. Step 4 plug connection or contact resistance ♦Switch on ignition. in the supply lead. ♦Measure voltage on plug A on Check and repair PCM2 between pin 4 and wiring harness. ground. → End ♦Switch on ignition. 4 Checking ground lead ♦Switch off ignition. < 5 Ω Check ground point ♦Measure resistance on plug A on Step 5 or corrosion in plug connection or con- PCM2 between pin 8 and tact resistance in ground. the supply lead. Check and repair wiring harness. → End 5 Replacing PCM2 → End Battery voltage too high Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Checking supply voltage ♦Switch off ignition. Battery voltage 11.4 Wiring/regulator or pin 30 ♦Remove plug A from PCM2. to 14.5 V. diodes faulty. Repair Step 2 wires or generator. ♦Switch on ignition. → End ♦Start engine and let it run at > 2,000 rpm. ♦Measure voltage on plug A on PCM2 between pin 4 and ground. 91-65 page 2 9101 8001 PCM2 - Gateway 8001GWlwl Printed in Germany – 29, 2002