B1 S1 - Upstream O2 sensor heater uses a BRown w/Light Green tracer for the power control and BlacK w/Light Green tracer for the ground side.
B1 S2 - Downstream O2 sensor heater uses a BRown w/WhiTe tracer for the power control and BlacK w/Dark Blue tracer for the ground side.
They connect the grounds at a splice (S100) and from there to a battery ground. Simple voltage test would show if they shorted to power and a continuity test to the bat negative terminal will show if they are open.
Upstream BR/LG wire goes into Connector 2 on the PCM at terminal 18
Downstream BR/WT wire goes into Connector 3 on the PCM at terminal 9
If they are open or grounded the heater circuit will throw a fault.
Wednesday, December 7th, 2016 AT 12:18 PM