986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - How do I diagnose and confirm bad Immobilizer

Cahlager · 01-23-2020, 08:41 AM

Hello, I recently bought a project 2000 Porsche Boxster with the 2.7 and the manual transmission. Car has 98k miles. My hope is to go full blown racecar over the next few years with it, and eventually have a stand alone engine management system. For now I would like to simply hear it run before I remove the transmission to replace the IMSB. I cannot get it started, and have believe I may have an issue with my immobilizer under the seat but dont know how to confirm that this is my problem. The car will not turn over with just the key alone, even when I jump the Clutch switch wires. The only way I have been successful in getting it to crank over is by jumping the starter relay AND turning the key. So with the the starter relay jumped, I can then turn the key and it will turn over, but it has no spark and i believe also no fuel injector pulse. I have removed the immobilizer and inspected the motherboard and i see no water damage or broken solder joints. But I can tell you that the car sat for some time with the windows down, so water damage may be present anyway.

I need some assistance with diagnosing my problem. Before I drop $600+ on having the electronics reprogrammed I would like to know without a doubt what the problem is.

Thanks in advance!!! You'll probably start seeing a lot more of me here on this and other boxtser forums as the project develops.

01-23-2020, 08:41 AM	#1
Cahlager Registered User Join Date: Jan 2020 Location: Payson Posts: 3	How do I diagnose and confirm bad Immobilizer Hello, I recently bought a project 2000 Porsche Boxster with the 2.7 and the manual transmission. Car has 98k miles. My hope is to go full blown racecar over the next few years with it, and eventually have a stand alone engine management system. For now I would like to simply hear it run before I remove the transmission to replace the IMSB. I cannot get it started, and have believe I may have an issue with my immobilizer under the seat but dont know how to confirm that this is my problem. The car will not turn over with just the key alone, even when I jump the Clutch switch wires. The only way I have been successful in getting it to crank over is by jumping the starter relay AND turning the key. So with the the starter relay jumped, I can then turn the key and it will turn over, but it has no spark and i believe also no fuel injector pulse. I have removed the immobilizer and inspected the motherboard and i see no water damage or broken solder joints. But I can tell you that the car sat for some time with the windows down, so water damage may be present anyway. I need some assistance with diagnosing my problem. Before I drop $600+ on having the electronics reprogrammed I would like to know without a doubt what the problem is. Thanks in advance!!! You'll probably start seeing a lot more of me here on this and other boxtser forums as the project develops.