2002 ford explorer
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From: hillsboro
2002 ford explorer
I got a 2002 ford explorer having trans problems I have changed the sensors on the trans it has a 5r55w in it changed the 4x4 module the fliuld and filter but still will not shift right and the speedometer goes way up to a 105 and engine starts to cut out and it feels like its is only running about 40 I need help please 
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you should get some yellow light- maybe a code for transmission stuck in 3 or 4th gear ? This is an electronic shift transmission. It uses solenoids and pistons to shift gears. Some contamination may get on spools and make one stick. I cant narrow it down to a location.
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Joined: Jun 2009
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From: Cedar Rapids, IA
I'd start by checking the speed sensor. If none of the other gauges are acting up, it's probably not an issue with the instrument cluster. The vehicle speed certainly effects transmission characteristics. I'm not sure what the speed limiter is set to on a stock 2002 Explorer, but if it's around 105 mph, the computer might be cutting off fuel for the speed limiter causing the truck to run very poorly.
Does your truck have RSC/AdvanceTrac or a 3-channel ABS system? I don't recall if the vehicle speed is sourced from the ABS system on all of the 2002 Explorers or not. On some of the earlier Explorers with ABS it was pretty common for the rear speed sensor to fail on the 3-channel systems.
-Rod
Does your truck have RSC/AdvanceTrac or a 3-channel ABS system? I don't recall if the vehicle speed is sourced from the ABS system on all of the 2002 Explorers or not. On some of the earlier Explorers with ABS it was pretty common for the rear speed sensor to fail on the 3-channel systems.
-Rod
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From: hillsboro
I replaced abs speed sensor on back never changed it I checked the speed by using my scanner but it was showing high to
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Logistics Pro
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From: Cedar Rapids, IA
I'm having a difficult time understanding these posts without punctuation. Did you mean you changed out the rear ABS sensor and it didn't have any effect on the speedometer operation? If that's the case and the scan tool is showing high speed too which correlates to the speedometer reading, that pretty much says whatever is interpreting the vehicle speed is likely causing the other issues as well.
Since it sounds like you only have 1 speed sensor in the rear, I'll check the service manual to confirm where the vehicle speed is sourced for a 3-channel ABS system in a 2002 Explorer.
Was there any service that was performed on this truck around the time that the speedometer started acting up?
Punctuation, or at least a carriage return to separate thoughts, would be appreciated.
-Rod
Since it sounds like you only have 1 speed sensor in the rear, I'll check the service manual to confirm where the vehicle speed is sourced for a 3-channel ABS system in a 2002 Explorer.
Was there any service that was performed on this truck around the time that the speedometer started acting up?
Punctuation, or at least a carriage return to separate thoughts, would be appreciated.
-Rod
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From: hillsboro
I'm having a difficult time understanding these posts without punctuation. Did you mean you changed out the rear ABS sensor and it didn't have any effect on the speedometer operation? If that's the case and the scan tool is showing high speed too which correlates to the speedometer reading, that pretty much says whatever is interpreting the vehicle speed is likely causing the other issues as well.
Since it sounds like you only have 1 speed sensor in the rear, I'll check the service manual to confirm where the vehicle speed is sourced for a 3-channel ABS system in a 2002 Explorer.
Was there any service that was performed on this truck around the time that the speedometer started acting up?
Punctuation, or at least a carriage return to separate thoughts, would be appreciated.
-Rod
Since it sounds like you only have 1 speed sensor in the rear, I'll check the service manual to confirm where the vehicle speed is sourced for a 3-channel ABS system in a 2002 Explorer.
Was there any service that was performed on this truck around the time that the speedometer started acting up?
Punctuation, or at least a carriage return to separate thoughts, would be appreciated.
-Rod
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From: Cedar Rapids, IA
I appreciate the punctuation, that was much easier to interpret.
I failed to check the service manual last night to see how the vehicle speed is sourced in the 3-channel ABS system. I think it is still via the rear wheel speed sensor and ABS system though. Does "the scanner" have the ABS software to check that system for codes, or was it a consumer grade unit that only accesses Powertrain diagnostic codes?
It is possible that some some of the first shifts are due to the solenoid pack/valve body. But it's also possible the firm shifts are commanded due to a higher than typical vehicle speed signal. I would still suggest focusing on getting the vehicle speed issue fixed before spending money on the transmission. If "the scanner" is a professional scanner, it should have the ability to determine if a "harsh shift" is commanded. That is actually one of the parameters in the transmission datastream.
-Rod
I failed to check the service manual last night to see how the vehicle speed is sourced in the 3-channel ABS system. I think it is still via the rear wheel speed sensor and ABS system though. Does "the scanner" have the ABS software to check that system for codes, or was it a consumer grade unit that only accesses Powertrain diagnostic codes?
It is possible that some some of the first shifts are due to the solenoid pack/valve body. But it's also possible the firm shifts are commanded due to a higher than typical vehicle speed signal. I would still suggest focusing on getting the vehicle speed issue fixed before spending money on the transmission. If "the scanner" is a professional scanner, it should have the ability to determine if a "harsh shift" is commanded. That is actually one of the parameters in the transmission datastream.
-Rod
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From: hillsboro
2002 explorer xls
Rod yes the scanner is got abs software. it had a code for the rear sensor failure. but it did not change it reading wrong. Is there a way to ohm the sensors. And if so what should they read. And what do you think about the two sensors in the transfer case. Would they have anything to do with the speedometer.
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From: Cedar Rapids, IA
It sounds like the sensors on the transfer case are likely output shaft speed sensors which would not effect the speedometer. From the factory service manual:
Sensor, Front and Rear Output Shaft Speed (OSS)
The externally mounted OSS sensors are located at the rear of the transfer case. The sensors provide the 4x4 electronic module with front and rear driveshaft speeds to control and adjust the transfer case clutch duty cycle.
Sensor, Vehicle Speed Sensor (VSS)
The Anti-Lock Brake System (ABS) provides the 4x4 electronic module with vehicle speed information to control and adjust the transfer case clutch duty cycle.
-Rod
Sensor, Front and Rear Output Shaft Speed (OSS)
The externally mounted OSS sensors are located at the rear of the transfer case. The sensors provide the 4x4 electronic module with front and rear driveshaft speeds to control and adjust the transfer case clutch duty cycle.
Sensor, Vehicle Speed Sensor (VSS)
The Anti-Lock Brake System (ABS) provides the 4x4 electronic module with vehicle speed information to control and adjust the transfer case clutch duty cycle.
-Rod
Logistics Pro
Joined: Jun 2009
Posts: 4,808
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From: Cedar Rapids, IA
The speed sensors in the transfer case or the wheel speed sensors? Ultimately, yes, it's possible. They are just Hall effect sensors. Considering the issue you're trying to track down though, you'll want to check them using an oscilloscope to see if they indicate an inconsistent pulse width.
The transfer case output shaft speed sensors though will not have an impact on your speedometer readings.
-Rod
The transfer case output shaft speed sensors though will not have an impact on your speedometer readings.
-Rod
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