To see what this tool looks like: Wire Piercing Probe.You should use a wire piercing probe and probe the wire a few inches away from the connector.Never probe the front of the connector.Why? Because this is the clearest indication that these ARE NOT the Connector Pin Out Charts for your particular vehicle. If one or any of the wires on your GM vehicle DO NOT match the color stated in the Pin Out Charts, then you should not use the Pin Out charts in this article.Here are some very important safety precautions when testing the wires coming out of the PCM connectors. HO2S Low Bank 1 Sensor 3 ( 4.3L and 5.0L only) HO2S Low Bank 2 Sensor 2 ( 5.7L and 7.4L only) H02S Bank 2 Sensor 2 ( 5.7L and 7.4L only) H02S Bank 1 Sensor 3 ( 4.3L and 5.0L only) 3-2 Control Solenoid ( Automatic Transmission only)
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