By reading the temperature gauge, when the car is running, we want to. With the engine cool, pull the dipstick and make sure the oil level is not low. If the motor is not maintaining oil pressure or reaching engine temperatures, it can cause the solenoid to fail and not activate VTEC. Just lightly touch your probe to the terminals. Step 1 Determine oil pressure and engine temperature. If you're disconnecting the connector and front probing, be very careful not to push your test light down into the terminals as you don't want to spread them and damage them so they don't make a good connection anymore. This is where a bidirectional scan tool that can command the PCM to activate the solenoid comes in really handy. If the ground is good, and the solenoid is good then either there is a break in the green/yellow wire from the PCM or the PCM is bad. Then you need to check the resistance of the solenoid to see if the solenoid is good. If you don't have backprobes, or don't know how to do that, you can unplug the sensor and carefully check the black wire with the test light connected to Battery +. If the solenoid is good you should also see the test light light up on that wire, as well. Then move the backprobe to the green/yellow wire. Take a test light, connect one end to Battery + and carefully touch the backprobe and see if the test light lights up, indicating a good ground. If I were looking at this, with the key off, I would use a back probe and check the black wire at the connector with it plugged in. It is power-side switched by the PCM, meaning the solenoid is supplied a constant ground on the black wire and the PCM sends power to the other side when it wants to turn on the solenoid. It is two wires in a black connector, that power up the solenoid.
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