P0193 - Fuel Rail Pressure Sensor Circuit High Input.
Over half of the time "sensor voltage low" and "sensor voltage high" fault codes are caused by wiring problems. We have to rule out cut or grounded wires, corroded connector terminals, and things like that before we order a part referenced in a fault code.
The place to start is by measuring the voltages at the sensor's connector. It is critical that these readings be taken when the sensor is plugged in. That can be done by back-probing the wires through the rubber weather-pack seals around them. Besides the sensor itself, this code will be set if the ground wire is open, (cut). It can also be set if the signal wire is open. To figure that out, with an open ground wire, you will find the same voltage on that wire as on the feed wire; typically 5.0 or 12.0 volts. Normal is 0.2 volts. If the signal wire is open, you will find a normal voltage at the sensor, but it will be different at the computer. You can see what the computer is seeing by viewing live data on a scanner. The voltage listed for "fuel pressure" will be radically different that what you measure with a voltmeter.
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Tuesday, August 22nd, 2017 AT 6:18 PM
