12-12-2019, 11:00 AM
With larger tires on a 98 Sport comes an incorrect speedometer.
My 'attempt' at recalibration, I added a reduction box to the Speedo cable. Now the MPH and Odometer reads very close to perfect.
If this was a Manual trans.. problem solved and done. But it's not.
After adding the reduction box. Now I throw P1875 codes and eventually a check engine light.
Reason is.. VSS in gauge cluster and Speed sensor in 03-72LE 4 Sp Auto differ by more than 10km/h
Per the 1800 supplementary service manual for the P1875 code.
DTC DETECTING CONDITION
While driving at higher than specified vehicle
and with more than specified throttle valve opening,
following conditions are satisfied for specified time.
. Vehicle speed sensed by vehicle speed sensor
speedometer) is more than 10 km/h lower than
sensed by transmission vehicle speed sensor when
4WD low switch is OFF, or
• Vehicle speed sensed by vehicle speed sensor (in
speedometer) is more than 10 km/h higher than that
sensed by transmission vehicle speed sensor when
4WD low switch is ON.
Any way of correcting this and keeping my reduction box in the speedo cable and stop the codes from being thrown? i calculate the difference is now 14-16 km/h
With 40 years of driving under my belt I would like a correct speedo and not have to do mph calcs in my head while driving or have another
external box to show my speed and odometer. I use the odometer for maintenance intervals.
Do I have any options?
My 'attempt' at recalibration, I added a reduction box to the Speedo cable. Now the MPH and Odometer reads very close to perfect.
If this was a Manual trans.. problem solved and done. But it's not.
After adding the reduction box. Now I throw P1875 codes and eventually a check engine light.
Reason is.. VSS in gauge cluster and Speed sensor in 03-72LE 4 Sp Auto differ by more than 10km/h
Per the 1800 supplementary service manual for the P1875 code.
DTC DETECTING CONDITION
While driving at higher than specified vehicle
and with more than specified throttle valve opening,
following conditions are satisfied for specified time.
. Vehicle speed sensed by vehicle speed sensor
speedometer) is more than 10 km/h lower than
sensed by transmission vehicle speed sensor when
4WD low switch is OFF, or
• Vehicle speed sensed by vehicle speed sensor (in
speedometer) is more than 10 km/h higher than that
sensed by transmission vehicle speed sensor when
4WD low switch is ON.
Any way of correcting this and keeping my reduction box in the speedo cable and stop the codes from being thrown? i calculate the difference is now 14-16 km/h
With 40 years of driving under my belt I would like a correct speedo and not have to do mph calcs in my head while driving or have another
external box to show my speed and odometer. I use the odometer for maintenance intervals.
Do I have any options?