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Jeff Lange · 07-02-2012, 02:26 PM

Looking into it further, it looks like the ECU has a dedicated "TACH" output signal, pin A35-15 on the ECU. This is the 35-pin connector.

It probably heads over to the DLC2 connector or something, because it isn't heading to any other systems in any of the wiring diagrams which is where I initially checked. Every other ECU, etc. uses the CAN-BUS to get the tach signal, but as I said there is an output dedicated to it on the ECU. It's not shown in any wiring diagrams, but it is mentioned in the RM.

Nice of them to do that.

Jeff

07-02-2012, 02:26 PM	#12
Jeff Lange Senior Member Join Date: Dec 2011 Drives: 1986 AE86 GT-S, 2011 Lexus IS250 6M Location: Calgary, Canada Posts: 661 Thanks: 136 Thanked 361 Times in 161 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Looking into it further, it looks like the ECU has a dedicated "TACH" output signal, pin A35-15 on the ECU. This is the 35-pin connector. It probably heads over to the DLC2 connector or something, because it isn't heading to any other systems in any of the wiring diagrams which is where I initially checked. Every other ECU, etc. uses the CAN-BUS to get the tach signal, but as I said there is an output dedicated to it on the ECU. It's not shown in any wiring diagrams, but it is mentioned in the RM. Nice of them to do that. Jeff __________________ 2011 Lexus IS350 F-Sport 6MT with LSD 1986 Toyota Corolla GT-S Supercharged