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OBDII TCU ECU question
Is there any way to get the transmission temperature reported through the live data on the OBD2 port? Is the TCU wired directly to the transmission temperature warning light or does the ECU control the light? If the ECU does then the ECU must know the temperature, right? Maybe the TCU can be modified to send the temperature to the ECU if it doesn't already do so?
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Tony 1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads 2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil 2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil 1992 Red Ferrari 348 ts, 82,XXX, Redline everything |
#2
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Re: OBDII TCU ECU question
The TCU reads the sensor and controls the light.
I don't yet have a copy of the OBD2 control units to study. As far as I know, the OBD2 SVX has an OBD1 TCU. So I don't think it's possible to get any transmission info via OBD2. It is possible to read transmission temperature using OBD1. You could confirm whether the TCU supports OBD2 by looking at the wiring diagram. Is the OBD2 "K-Line" diagnostics wire (pin 7 or 10 of the diag connector) connected to the TCU? Or is it only connected to the ECU? The 97 TCU is different hardware and software to the earlier cars and we don't know how to mod it. Even if we could mod it, the mod you are suggesting would be difficult.
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#3
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Re: OBDII TCU ECU question
Quote:
Also, any idea if the TCU error codes get reported through the OBDII port or if we need to do the manual button dance?
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Tony 1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads 2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil 2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil 1992 Red Ferrari 348 ts, 82,XXX, Redline everything |
#4
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Re: OBDII TCU ECU question
Somebody on this forum may have it, or access to it.
Quote:
I think a standard OBD2 reader will probably only give you engine codes and data.
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#5
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Re: OBDII TCU ECU question
Quote:
Do all TCU codes cause a light to flash somewhere?
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Tony 1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads 2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil 2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil 1992 Red Ferrari 348 ts, 82,XXX, Redline everything |
#6
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Re: OBDII TCU ECU question
The ATF temperature light will blink 16 times on startup if there is a code instead of pre-95 models flashing the power light. So more than likely, code retrieval is going to be the same.
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