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Re: Toyota Help understanding 02 heater circuit ground
Posted to Technical Theory Forum on 2/9/2010

Update

I stayed after school and we started over on the circuit and also armed with Toyota's flow chart to troubleshoot this circuit out.

Our ciruit is complete from Battery positive, through EFI relay to Bank 2 02 heater through heater to PCM HT1B (pink/... Login to read more.