01 explorer sport speedometer problem

[Explorerbmx]

I'm new to this site, but i have a 2001 explorer sport and my speedometer doesnt work. I had a cel come on so i plugged in the obd2 code reader and i got a code saying generic speed sensor mal###tion i purchased the diff speed sensor reset the cpu then changed the speed sensor and it still didnt work i changed a few more sensors that are on the tranny and that didnt change anything im still getting the code, im starting to think its a wiring problem. i changed the 4wabs module a while back im wondering if that would have anything to do with the speed sensor not working?

 

[2000StreetRod]

vehicle speed sensor

The 4 wheel anti-lock brake system (4WABS) module generates the vehicle speed signal. The 4WABS module derives the speed signal from the rear axle speed sensors included in the 4WABS system. The VSS signal originates at Pin 19 (GY/BK) wire of connector C186 to the 4WABS. The signal goes to the speed control servo, PCM, radio, instrument cluster, generic electronic module (GEM), message center, air suspension control module, and compass/outside air temperature module.

Below are the possible VSS related OBD codes:

P0500 Vehicle Speed Sensor Malfunction
P0501 Vehicle Speed Sensor Range/Performance
P0502 Vehicle Speed Sensor Low Input
P0503 Vehicle Speed Sensor Intermittent/Erratic/High

I assume that you read P0500. The PCM is not receiving the VSS signal and your speedometer is not receiving the signal. Your cruise control also probably doesn't work. Check the 25 pin connector (C186) to the 4WABS. Check the rear axle sensor and connector (C422). With C422 disconnected from the sensor and C186 disconnected from the 4WABS measure for continuity from C186 pin 17 to C422 pin 2 (RD/PK wire), C186 pin 1 to C422 pin 1 (LG/BK wire). Also make sure either wire is not shorted to the chassis. You can also disconnect the PCM connector and check for continuity from C186 pin 19 to PCM connector (C202) pin 58 (GY/BK wire) and no short to chassis.

If you have good connections, continuity, and no shorts to the chassis then either your 4WABS module or the rear axle sensor is bad. According to Haynes the VSS sensor is a variable reluctor located on top of the differential.

 

[Explorerbmx]

The 4 wheel anti-lock brake system (4WABS) module generates the vehicle speed signal. The 4WABS module derives the speed signal from the rear axle speed sensors included in the 4WABS system. The VSS signal originates at Pin 19 (GY/BK) wire of connector C186 to the 4WABS. The signal goes to the speed control servo, PCM, radio, instrument cluster, generic electronic module (GEM), message center, air suspension control module, and compass/outside air temperature module.

Below are the possible VSS related OBD codes:

P0500 Vehicle Speed Sensor Malfunction
P0501 Vehicle Speed Sensor Range/Performance
P0502 Vehicle Speed Sensor Low Input
P0503 Vehicle Speed Sensor Intermittent/Erratic/High

I assume that you read P0500. The PCM is not receiving the VSS signal and your speedometer is not receiving the signal. Your cruise control also probably doesn't work. Check the 25 pin connector (C186) to the 4WABS. Check the rear axle sensor and connector (C422). With C422 disconnected from the sensor and C186 disconnected from the 4WABS measure for continuity from C186 pin 17 to C422 pin 2 (RD/PK wire), C186 pin 1 to C422 pin 1 (LG/BK wire). Also make sure either wire is not shorted to the chassis. You can also disconnect the PCM connector and check for continuity from C186 pin 19 to PCM connector (C202) pin 58 (GY/BK wire) and no short to chassis.

If you have good connections, continuity, and no shorts to the chassis then either your 4WABS module or the rear axle sensor is bad. According to Haynes the VSS sensor is a variable reluctor located on top of the differential.

the rear axle sensor is new and before that the abs would come on anytime i stopped on the front right wheel but i tried all the fuses and a few other things i even put a 4wabs module of another explorer sport i had (the same model) but stupid me i never thought to check the abs sensor in the front hub wheel bearing, sure enough that was the problem so i changed the 4wabs for nothing and im starting to think that the abs module is causing the problem because all the sensors are new the only thing different other than the sensors is the abs module. I just havent got around to putting the perfectly working original one back on to see if it changes anything right now i use a gps to see how fast i'm going lol sorry and i did have a p500 code

 

[2000StreetRod]

cruise control?

You didn't mention if your cruise control works.

 

[Explorerbmx]

cruise control

Sorry, but yes the cruise control does not work either

 

[2000StreetRod]

no VSS signal

Sorry, but yes the cruise control does not work either

Since the speedometer and cruise control both don't work and the PCM is reporting the same I suspect there is no VSS output from the 4WABS. I suggest tracing the wiring from the rear axle sensor to the 4WABS.

 

[Explorerbmx]

It was the abs module i fixed that problem but now my master cylinder is shot lol