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Discussion Starter · #22 ·
Just an observation; Is it a coincidence that the AEM uses the same scale 0-255?
0-255 is a typical scale in 8 bit computers. 2 ^8 (bit) = 256

What that translates to in terms of mass air flow is anybody's guess, the timing maps are more valuable to us in general.
 

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I'm late to the party here and not at all familiar with this generation of ecu that you're working with, but I'm very interested in what you're doing and potential applications with other Toyota ECU's. I had no idea that this capability was available for ECU's pre-dating J2534/CAN. Can you tell me the part numbers of these ECU's? What processor is used in them? Does it have an IDA module available?

Can you tell me what tools you're using for reading and writing to the ECU? Is there a source for the definition files (.xdf)?

I don't know that I have anything useful to contribute here except for a side note that on later ecu's like the 2Gr-FE the ignition angle scale factor is 0.25. I've been trying to gather information on these ECU's in another thread titled "2GR-FE ECU Tools and Techniques."
 

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Discussion Starter · #24 ·
I'm late to the party here and not at all familiar with this generation of ecu that you're working with, but I'm very interested in what you're doing and potential applications with other Toyota ECU's. I had no idea that this capability was available for ECU's pre-dating J2534/CAN. Can you tell me the part numbers of these ECU's? What processor is used in them? Does it have an IDA module available?

Can you tell me what tools you're using for reading and writing to the ECU? Is there a source for the definition files (.xdf)?

I don't know that I have anything useful to contribute here except for a side note that on later ecu's like the 2Gr-FE the ignition angle scale factor is 0.25. I've been trying to gather information on these ECU's in another thread titled "2GR-FE ECU Tools and Techniques."
I have bin dumps for UK and jdm gen 3 ecu's and xdf files for tunerpro rt. Most of the old Toyota ecu's operate very similarly. If you jump e1 and te1 diagnostic pins one of the cpu's outputs a serial stream of operating parameters. If you go on eBay you can buy a pre obd Toyota connecter and wire that to a serial connecter db9 for a laptop then use the program I have, I forget the name, to monitor the engine.

For the ECU, I use a moates ostrich ROM emulator then I plug into daughter boards installed in my ECU. With that I can run one of my bin files and live tune. Then if I'm done I can use a chip flasher to program a cpu and reinstall into the board.

Then gen3 uses a dual core setup. One cpu seems to calculate most of the fueling and or maybe some of the timing. The other cpu seems to have something to do with knock response. I don't have the part numbers of the top of my head and I'm not at home right now. But respond to this thread to remind me to get them but yes I have Ida files for the ecus.
 

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Discussion Starter · #26 · (Edited)
Above link has CarTester for logging directly from 93+ ECUs, CPU/ROM dumps with XDF files, and IDA files

Last post was typed out by my gf while we were driving lol.

I have a set of daughter boards that JonS designed, last I heard from him he was working on a new hardware version with a direct usb connection
 

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Discussion Starter · #27 ·
Got a tip on the formula for the ignition units.

The JDM Gen3 ignition timing table is as follows:
- in inHg, + in PSI400600800100012001400160018002000220024002600280032003600400044004800520056006000640068007200
-25.0821.9529.0232.2039.7643.1744.1545.3746.1046.8349.0250.2450.4950.9851.2251.2251.2251.2251.2251.2251.2251.2251.2251.2251.22
-20.2417.8025.8529.0233.4139.0239.7641.2242.6846.1046.3448.2948.5450.2450.9850.9850.9850.9850.9850.9850.9850.9850.9850.9850.98
-15.4113.4118.5423.4126.8329.7631.2237.0737.5639.7642.4443.9044.6345.3747.5649.0249.0249.5149.5149.5150.2450.9850.9850.9850.98
-10.5910.2415.6120.4924.3927.5629.2732.2032.6832.9335.3736.8339.0240.7342.4443.1743.1743.1743.1743.1743.1743.4143.4143.9044.63
-5.769.2711.9516.3419.7624.8825.6130.0030.0031.2232.2033.4133.6636.1037.8039.0239.0239.0239.0239.2739.7636.8337.3237.5641.22
-0.929.2710.0010.7317.3222.6823.4126.8326.8326.8329.7632.6833.6635.3737.0737.8038.2938.5438.5439.0239.0236.1036.8336.8340.49
1.927.808.7810.0014.1519.7620.7324.3925.1225.8527.8031.2231.9534.8836.1036.3436.8337.0736.8337.5637.5638.2938.2939.0239.76
4.297.077.808.7812.6816.5919.0223.4123.4124.1526.1028.2929.2731.2233.4135.3734.6334.6334.1534.8834.8834.8835.6136.3437.56
6.666.347.077.8011.9515.6117.0718.5419.0220.4921.2224.3925.6126.1030.7330.7330.4930.4929.7630.4931.2231.2231.4632.2032.93
9.036.346.346.347.8012.2013.6615.1216.3417.8019.2720.4922.9324.8826.8327.0725.8526.3425.6127.0727.0728.2928.5429.0230.49
11.416.346.346.347.809.2710.2411.9512.9314.1515.6117.3218.2920.4923.4123.4121.9525.6124.3926.3426.8326.8326.8328.2929.76
13.786.346.346.346.346.347.328.549.5110.7312.6814.1515.6117.0719.7623.4119.7622.6820.4921.9523.4125.1224.8827.5629.02

The UK ST205 (91 octane) ignition table is
400600800100012001400160018002000220024002600280032003600400044004800520056006000640068007200
-25.0821.9529.0232.2039.7643.1744.1545.3746.1046.8349.0250.2450.4950.9851.2251.2251.2251.2251.2251.2251.2251.2251.2251.2251.22
-20.2417.8025.8529.0233.4139.0239.7641.2242.6846.1046.3448.2948.5450.2450.9851.2251.2251.2251.2251.2251.2251.2251.2251.2251.22
-15.4113.4118.5423.4126.8329.7631.2237.0737.5639.7642.4443.9044.6345.3747.5649.0249.0249.2749.2749.5150.2450.9850.9850.9851.22
-10.5910.2415.6120.4924.3928.2929.2731.9532.2032.9335.3736.8339.0240.7342.4442.6843.1743.1743.1743.1743.4143.4143.4143.9044.63
-5.769.2711.9516.3419.7624.8825.6130.0030.4931.2232.2033.4133.6635.3736.8338.2939.0239.0239.2739.2739.7636.8337.5638.7841.71
-0.929.2710.0010.7316.5922.6824.1525.8526.8327.5629.0231.2232.6833.9036.1037.5637.8038.2938.2938.5439.0236.8336.8337.5641.22
1.927.808.7810.0014.1518.5421.4624.8825.1227.0728.2930.4931.2232.6834.1534.8835.6136.1035.3736.8337.5638.2937.8039.0239.76
4.297.077.808.7812.9316.3419.0221.4621.9523.4124.3925.6126.3428.2931.2232.6831.9532.2031.2232.6833.6633.6633.9035.3736.34
6.666.347.077.8011.9515.6117.0718.5419.0219.7620.7322.6823.4124.1529.0229.0228.0528.5426.8329.7630.0030.0030.4931.9532.93
9.036.346.346.347.8012.2013.6615.1216.3417.8019.2719.7620.0020.0021.9523.6621.9523.4122.2024.1525.8526.8327.5629.0230.49
11.416.346.346.347.809.2711.9512.9314.1515.6116.3416.3416.5917.8018.2919.7618.0520.4919.7621.4623.4123.4124.3927.5629.02
13.786.346.346.346.346.347.328.549.5110.7312.6814.1515.6117.0716.5919.0216.3420.0017.0719.7621.2221.9522.6823.4125.12


JDM vs UK timing
400600800100012001400160018002000220024002600280032003600400044004800520056006000640068007200
-25.080.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.00
-20.240.000.000.000.000.000.000.000.000.000.000.000.000.000.00-0.24-0.24-0.24-0.24-0.24-0.24-0.24-0.24-0.24-0.24
-15.410.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.240.240.000.000.000.000.00-0.24
-10.590.000.000.000.00-0.730.000.240.490.000.000.000.000.000.000.490.000.000.000.00-0.240.000.000.000.00
-5.760.000.000.000.000.000.000.00-0.490.000.000.000.000.730.980.730.000.00-0.240.000.000.00-0.24-1.22-0.49
-0.920.000.000.000.730.00-0.730.980.00-0.730.731.460.981.460.980.240.490.240.240.490.00-0.730.00-0.73-0.73
1.920.000.000.000.001.22-0.73-0.490.00-1.22-0.490.730.732.201.951.461.220.981.460.730.000.000.490.000.00
4.290.000.000.00-0.240.240.001.951.460.731.712.682.932.932.202.682.682.442.932.201.221.221.710.981.22
6.660.000.000.000.000.000.000.000.000.730.491.712.201.951.711.712.441.952.930.731.221.220.980.240.00
9.030.000.000.000.000.000.000.000.000.000.000.732.934.884.883.413.902.933.412.931.221.460.980.000.00
11.410.000.000.000.000.00-1.71-0.98-1.22-1.46-0.730.981.712.685.123.663.905.124.634.883.413.412.440.730.73
13.780.000.000.000.000.000.000.000.000.000.000.000.000.003.174.393.412.683.412.202.203.172.204.153.90
 

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Good info to have as reference. Up to 4deg difference at upper end between UK & JDM.

Thanks again for the insight.

jimb
 
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