Chrysler 1998 Voyager Service Manual page 342

8E - 6 INSTRUMENT PANEL AND SYSTEMS
DIAGNOSIS AND TESTING (Continued)
CONDITION
SPEEDOMETER
INACCURATE.
POSSIBLE CAUSES
1. Speedometer Out of
Calibration.
2. Wrong Speedometer
Pinion Size For Tire Size.
3. Bad Speed Sensor.
CORRECTION
1. (a) Perform Cluster Self Diagnostic Test.
• If speedometer is accurate to the calibration points
then look for another possible cause of inaccuracy.
• If speedometer is not accurate to the calibration
points, go to Step (b).
(b) Use a scan tool to calibrate speedometer.
2. (a) If vehicle has a 4 speed electronic transmission
go to Step (c). Otherwise go to Step (b).
(b) Check if correct speedometer pinion is being used
with tires on vehicle. Refer to transmission section of
manual for test and repair procedure.
• If the incorrect pinion is in transmission then replace
with correct pinion.
• If the correct pinion is in the transmission calibrate
speedometer using a scan tool to correct for the
inaccuracy.
(c) use a scan tool to check the TCM to see if the
correct tire size has been programmed into the TCM.
• If the incorrect tire size was selected, select the
proper tire size.
• If the correct tire size was selected, calibrate
speedometer to correct for the inaccuracy.
3. Refer to the proper section of the service manual for
test and repair procedure.
NS