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I've had two wiring harnesses for my electronic VVT go bad on me, so rather than look for another used replacement, I embarked on a journey to find another way to activate the VVT solenoid. Essentially, the printed circuit board that is located within the white plastic connector acts to put 12 volts across the two prongs of the solenoid when a trigger signal is sent from the throttle position sensor (TPS). Therefore, I figured that if I could find a suitable relay that is triggered by the TPS signal, I could activate the solenoid by grounding one prong of the solenoid and connecting the other solenoid to the relay output (with the relay input connected to 12VDC).
I tried the standard Bosch-style coil-driven relays, but the signal from the TPS was insufficient to trigger the relays, so I went looking for another solution. After some research, I decided to try a solid-state DC relay. I ordered the 10A relay below on eBay ($9.00), waited a few weeks for it to arrive from China, and then tested it out.
A little bit to my surprise, it actually worked, and the VVT is back in business. I mounted the relay on the side wall of the engine compartment near the intake plenum. It's only been a couple of days, so I will keep checking on it. For those interested, also below is a wiring diagram of my set-up.
I tried the standard Bosch-style coil-driven relays, but the signal from the TPS was insufficient to trigger the relays, so I went looking for another solution. After some research, I decided to try a solid-state DC relay. I ordered the 10A relay below on eBay ($9.00), waited a few weeks for it to arrive from China, and then tested it out.
A little bit to my surprise, it actually worked, and the VVT is back in business. I mounted the relay on the side wall of the engine compartment near the intake plenum. It's only been a couple of days, so I will keep checking on it. For those interested, also below is a wiring diagram of my set-up.
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