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Title: Immo off 2.0 MKIV 2002 Immo2 - what am I missing? Post by: KyushaKitsune on September 10, 2025, 01:15:05 PM Hey all,
Trying to Immo-off my wife's daily - 2002 Jetta 2.0, since the megamos chip in the cluster fried. What I've done so far: Built a bench harness, and I am able to successfully read and write the 95040 in boot mode. Modified the file using eepromtool_04 Confirmed successful write of the modified file. Reinstalled ECU and cleared DTCs. Car still starts and dies immediately, and throws code 17978 - 35-00 "Engine Start Blocked by Immobilizer" What am I missing here? Does the 2.0 use a different address for Immo on/off flags? Comparing the two files in a hex editor, it looks like eepromtool modifies more than just the Immo flag locations. Do I need to edit it manually instead? Attached are the original 95040 and modified version (which I read form the eeprom to confirm a successful write.) Thank you for any help you can provide. ECU 06A906032FP 2.0l R4/2V G 4072 Title: Re: Immo off 2.0 MKIV 2002 Immo2 - what am I missing? Post by: KyushaKitsune on September 11, 2025, 06:05:08 PM Tonight I tried editing the file manually, changing only the Immo flags to 02, and adjusting the checksums accordingly.
Still no luck. Engine start blocked by immobilizer. I noticed the Immo flag values on my original 95040 are 04, where I would expect to see 01. I'm out of ideas. ??? Attached is my manual edit. Title: Re: Immo off 2.0 MKIV 2002 Immo2 - what am I missing? Post by: gremlin on September 15, 2025, 11:05:17 AM I noticed the Immo flag values on my original 95040 are 04, where I would expect to see 01. I'm out of ideas. ??? The original EPROM dump of your control unit is intended for cars sold in the USA, without a factory immobilizer. This is easy to determine by obvious signs - the 04 value instead in place of the immobilizer byte and the characters XXXXXXXXXXXXXX instead of the VIN number. |