How to Determine if a Six-Wire Electronic Throttle is Good or Bad?
2 Answers
First, observe whether the idle speed is stable. Then, rev the engine in neutral up to 4000 RPM, release the throttle pedal, and check if the throttle returns smoothly. Directly read the data to see if there are any fault codes. Under normal driving conditions for about 40,000 kilometers, it's necessary to clean the throttle body, fuel injectors, and intake manifold.
I've been repairing cars for nearly twenty years, and judging the condition of a six-wire electronic throttle requires a step-by-step approach. First, unplug the connector and measure the resistance. The two wires driving the motor should normally have a resistance of 3-8 ohms; if they're open-circuit, the throttle is done for. Next, test the sensor power supply wire—it should show 5V when the ignition is in the ON position, and the two ground wires must ensure zero resistance. The most critical part is the position sensor signal wire, which must be tested while the engine is running: at idle, the voltage should be around 0.5V, and it should rise to about 4.5V when the throttle is fully pressed. If the signal is out of sync or unresponsive, replace it immediately. Finally, don’t forget to check the wiring harness for any exposed or short-circuited wires, as oxidized connector pins can also cause issues. Older cars' throttles are prone to carbon buildup and sticking, so it’s a good idea to clean the valve plates and reset the ECU parameters for better performance.
