Testing the vehicle speed sensor
10-30-2012, 10:57 AM
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Testing the vehicle speed sensor
Hi All
This forum has been very helpful and now I feel I may have something to contribute in return. My apologies if this has been covered before.
I have a 2001 4R, SR5, automatic, 2WD with a failed electronic speedometer and odometer. In addition, the combination unit is festooned with VSC, ABS, TRAC and PARKING BRAKE lights. The CEL light is on and there is one DTC code: P0500 = Speed sensor number 1 malfuncton.
Oddly, my FSM does not even acknowledge a speed sensor number 1 but does say that speed sensor number 2 is on the transmission, passenger side and monitors the rotation of the transmission tail shaft.
Okay so here is the helpful bit. If the transmission is shifting properly the vehicle speed sensor and the harness to the ECM is likely good. Now slide under the transmission, disconnect the connector from the sensor and go for a drive. If it won't shift out of low gear you have further proof that the sensor and harness is okay. After reconnecting the speed sensor, the transmission should shift normally again.
If all of the above is true look elsewhere for the problem.
If any of you can identify speed sensor number 1 on this SUV, I would be eternally grateful. I don't know how Toyota missed this on in their FSM.
If you have a manual transmission or 4WD, all of this may not apply.
Cheers,
ZZ
This forum has been very helpful and now I feel I may have something to contribute in return. My apologies if this has been covered before.
I have a 2001 4R, SR5, automatic, 2WD with a failed electronic speedometer and odometer. In addition, the combination unit is festooned with VSC, ABS, TRAC and PARKING BRAKE lights. The CEL light is on and there is one DTC code: P0500 = Speed sensor number 1 malfuncton.
Oddly, my FSM does not even acknowledge a speed sensor number 1 but does say that speed sensor number 2 is on the transmission, passenger side and monitors the rotation of the transmission tail shaft.
Okay so here is the helpful bit. If the transmission is shifting properly the vehicle speed sensor and the harness to the ECM is likely good. Now slide under the transmission, disconnect the connector from the sensor and go for a drive. If it won't shift out of low gear you have further proof that the sensor and harness is okay. After reconnecting the speed sensor, the transmission should shift normally again.
If all of the above is true look elsewhere for the problem.
If any of you can identify speed sensor number 1 on this SUV, I would be eternally grateful. I don't know how Toyota missed this on in their FSM.
If you have a manual transmission or 4WD, all of this may not apply.
Cheers,
ZZ
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