Author Topic: Identify EEPROM  (Read 702 times)

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Offline l0rd_hexTopic starter

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Identify EEPROM
« on: October 28, 2021, 10:24:24 pm »
Hello friends,

The tiny robot that lives in my 2000 Honda Accord is sick. The robot, or what some might call "an ecu" has this 8 pin jobbie on it. Does anyone recognize it? The part number appears to be 3917 and the S logo is familiar but I can't place it.
"I haven't paid taxes in six years, and I'm not getting busted by a damn sandwich." - Benjamin Franklin
 

Offline eti

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Offline Benta

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Re: Identify EEPROM
« Reply #2 on: October 28, 2021, 11:16:17 pm »
Who's been fiddling with it?
The upper four leads are bent, someone desoldered the lower four pins and lifted the device, did something with it, bent it back and resoldered it in an amateurish way.
I'd ask the previous owner what this is about. Some kind of "Tuning"?
 

Offline l0rd_hexTopic starter

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Re: Identify EEPROM
« Reply #3 on: October 29, 2021, 06:01:10 pm »
Mmm no one has fiddled with it, recently anyways. It still had the conformal coating from the factory (you can see it a bit at the left of the chip). This is actually on the immobilizer daughter board. Unfortunately the robot no longer recognizes the RFID tag inside my keys. It's been an intermittent problem but I want to fix it permanently as I'd like to sell the car (robot and all).

I've seen else where that the immobilizer emulator chips send out a 1kHz 50% duty cycle square wave at 5V on one of the pins to tell the main cpu robot that the key is valid while the engine is running. I'm going to take a stab at mocking one up with an ATTINY85 'cause why not. I'm just curious how the rest of the circuit works at this point.
"I haven't paid taxes in six years, and I'm not getting busted by a damn sandwich." - Benjamin Franklin
 


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