Please tell me if my idea will WORK, I include a wire schematic for the G sensor.
I have looked at the factory service manual wiring schematic, and it looks like it is a simple variable resistor divider can be used to replace it. The sensor is designed to detect bumpy roads
The output voltage back to PCM is supposed to be between 2.35 to 2.65 vdc for normal operation.
Reference voltage is 5vdc
Ground is well ground turned on by PCM
I am thinking use a 500 ohm pot and set the voltage to middle or 2.45vdc for the detection wire feeding back to the PCM
The amp load for 5vdc with a 500 ohm resistance from ref to gnd is 0.01 amps, so I doubt the PCM would have an issue with that low amps?
Here is a description of how it functions
The G-sensor is also known as the Rough-Road sensor. (1996 Trooper)
From Alldata.com:
The Gravity (G) sensor is a vertical Low-g (gravity) acceleration sensor. By sensing vertical acceleration caused by bumps or potholes in the road, the powertrain control module (PCM) can determine if the changes in crankshaft speed are due to engine misfire or are driveline induced. If the G sensor detects a rough road condition the PCM misfire detection diagnostic will be deactivated. The G sensor at rest output should be between 2.35 - 2.65 volts (+1G). During a rough road condition the voltage output can vary between 0.5 volt (-1G) and 4.5 volts (+3G).
I have looked at the factory service manual wiring schematic, and it looks like it is a simple variable resistor divider can be used to replace it. The sensor is designed to detect bumpy roads
The output voltage back to PCM is supposed to be between 2.35 to 2.65 vdc for normal operation.
Reference voltage is 5vdc
Ground is well ground turned on by PCM
I am thinking use a 500 ohm pot and set the voltage to middle or 2.45vdc for the detection wire feeding back to the PCM
The amp load for 5vdc with a 500 ohm resistance from ref to gnd is 0.01 amps, so I doubt the PCM would have an issue with that low amps?
Here is a description of how it functions
The G-sensor is also known as the Rough-Road sensor. (1996 Trooper)
From Alldata.com:
The Gravity (G) sensor is a vertical Low-g (gravity) acceleration sensor. By sensing vertical acceleration caused by bumps or potholes in the road, the powertrain control module (PCM) can determine if the changes in crankshaft speed are due to engine misfire or are driveline induced. If the G sensor detects a rough road condition the PCM misfire detection diagnostic will be deactivated. The G sensor at rest output should be between 2.35 - 2.65 volts (+1G). During a rough road condition the voltage output can vary between 0.5 volt (-1G) and 4.5 volts (+3G).
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