ECU Reprogramming: Right Chip?

[4runnerguy]

I'm getting ready to virginize my ECU to program some keys. Most YouTube how-to's reference an IC900 chip, which is labeled on the board. The only one that seems to fit the bill is the one I circled in red, but it isn't specifically labeled IC900. Before I start tinkering, do I have the right one?

 

[Bisho]

You can program new keys and erase old keys without messing with the ECU. Maybe I don’t understand what you’re trying.

 

[4runnerguy]

My situation is I only have a 1998 HZJ105 with only a valet key and the physical master key (the fob was smashed and electronics were gone before I purchased it). From what I read here and here, you need to "viriginize" the IC900 chip in this scenario. This YouTube video lays out what I'm attempting. (@Mauser is the guru; he used to do this as a service.)

If there's an easier way, I'm all ears.

For what it's worth, I'm not totally sure my ECU is original to the truck. It had its 1HZ swapped for a 1HD-FT, and I'm not sure if the ECU was original to the truck or the engine. I've searched the part number and haven't found anything.

 

[kevgentile]

I've done a few ecm's and 93c56 chips but this one is one I'm not familiar with since it's an early production truck but has the separate immobilizer module like the '03+ 100 series. The early integrated units require virgin chips if no master is present. The later units allow jumping thru the diag port to accomplish the task.

 

[kevgentile]

Might want to post up in the 80 series section since the motor and modules are essentially from that era. That immob ecu looks like the 96-98 units. I'd also probably scroll through the wiring diagrams for the 80 to confirm.

 

[4runnerguy]

Not a bad idea... I've posted over there. I have a 1HD-FT repair manual, and this thing doesn't look like any of the ECUs referenced in the manual. I'm pretty sure it isn't a separate module on this truck and it does look like the part in the parts diagram, but it was in a different location than factory. (I suspect they left the old wiring in when they swapped the engine.)

 

[kevgentile]

Too bad the module doesn't have the date code printed on it like most do.

 

[4runnerguy]

Next time I get it out, I'll look to see if there's a code on the other sides or inside the case. I don't remember seeing one, though.

 

[smoltz]

I'm getting ready to virginize my ECU to program some keys. Most YouTube how-to's reference an IC900 chip, which is labeled on the board. The only one that seems to fit the bill is the one I circled in red, but it isn't specifically labeled IC900. Before I start tinkering, do I have the right one?

First, let me provide some backround, I know very little about the immobilizer and repgroramming. However, I do have a background in electronics. A quick google search of IC900 yields that it typically referes to the 93C56 EEPROM. Which makes sense, an EEPROM (eletricaly ereasable progmmable read only memory) is used for storage and so it stands to reason that this would be used to store immobilzer data. On the board you have shown I don't believe there is a 93C56, HOWEVER there is a 93LC66 (ref des IC2) which is also an EEPROM and used in various Toyota immobilizers (google for Toyota 93LC66) and you'll see a bunch of hits. I would start there if I were you.

Toyota : virginize immo box eeprom (93LC66) to enter key learning mode

Hello everyone, I'm in a all keys lost situation with my toyota hiace 2008 being stuck in very small mountain village. After lot of research on internet here is what I would like to do: Get new cutted keys from a Toyota dealer with my VIN. (done) Get the immobox from my vehicle...

www.digital-kaos.co.uk

 

[Mauser]

Have you tried Techstream?

 

[4runnerguy]

Have you tried Techstream?

No, not yet. It has a port, but I haven't tried it yet. ODB1, I presume? I'm still getting Techstream up and running with a run of the mill ODB2 interface. Is it as simple as buying something like this?

 

[Mauser]

No, not yet. It has a port, but I haven't tried it yet. ODB1, I presume? I'm still getting Techstream up and running with a run of the mill ODB2 interface. Is it as simple as buying something like this?

View attachment 3625425View attachment 3625426

Dang, I didn't even think about it being OBDI. I know nothing about diagnostics on them, or if it would be possible with Techstream. Sometime during 2002 the US spec trucks got a separate immo ecu like yours. These are able to be programmed using Techstream. Yours I am unsure of.

The later US spec 100 series has the separate immo ecu, but still stores key info in the main ecu and they must match for the engine to run. These trucks the ecu can be changed, and by using a jumper wire in the data connection you can "handshake" the two and program the key info into the main ECU from the immo box.

It is possible for the master key info to be read off the immo chip and be written to a keytag that could be used to program new keys. If you have the hex code a good locksmith should be able to help if they are just a little bit nerdy.

 

[Mauser]

Are you just wanting more keys to start the rig? A decent locksmith can clone the valet key you already have.

 

[4runnerguy]

I really want factory keyless entry to work. I have two factory key modules and matching YotaMD cases on their way. "Decent locksmith" is a little more nebulous here since I'm in a landlocked African country.

How would a Toyota dealer program keys on an ODB1-equipped truck? Since my truck has an engine swap and I'm dubious of most mechanics here, I'm doing this more to make sure it's done right than to save money.

 

[Mauser]

I really want factory keyless entry to work. I have two factory key modules and matching YotaMD cases on their way. "Decent locksmith" is a little more nebulous here since I'm in a landlocked African country.

How would a Toyota dealer program keys on an ODB1-equipped truck? Since my truck has an engine swap and I'm dubious of most mechanics here, I'm doing this more to make sure it's done right than to save money.

You might contact @LexusV8 Engines they advertize here. They might be able to help.

 

[LexusV8 Engines]

Could you please give the ECU part number you are trying to get running. Also do you want to keep the stock immo system? Or would you like to remove the immo and do your own custom immo.. Custom is far safer to prevent theft. Seems like GX470 03? But send me the ECU part number.

 

[4runnerguy]

Could you please give the ECU part number you are trying to get running. Also do you want to keep the stock immo system? Or would you like to remove the immo and do your own custom immo.. Custom is far safer to prevent theft. Seems like GX470 03? But send me the ECU part number.

The part number is 89780-60110. It's in post #3. It's a 1998 South African-spec HZJ105.

 

[LexusV8 Engines]

The part number is 89780-60110. It's in post #3. It's a 1998 South African-spec HZJ105.

Yes. I understand that but i am asking for the engine ECU part number. Not the immobilizer ECU part number. Can you post a picture of the engine ECU showing the label and another showing the connectors going into it. I think best for you to contact Derrick at V8Solid. He is based in South Africa so much easier for you to be in touch with him regarding this. He should be able to sort it out for you.