S10/T10 Blazer 4WD V6-262 4.3L (1989)
Fig. 49 Speedometer Calibration Chart.
The speedometer must be recalibrated to allow proper system operation whenever the rear axle ratio or rear tire size is changed. Calibration requires
the use of a speedometer calibration service kit. When servicing the digital ratio adapter and calibrating the speedometer, do not touch the pins on the
rear of the instrument cluster as immediate damage to the cluster will occur.
1.
Remove instrument cluster assembly as outlined.
2.
Plug connector from speedometer calibration service kit into rear of cluster, Figs. 47 and 48.
3.
Momentarily touch connector leads across battery terminals noting the following:
a.
Service kit connector should be used a maximum of 10 times.
b.
It is not necessary to momentarily energize calibration system if speedometer has been previously calibrated.
4.
Refer to the calibration chart Fig. 49, to determine which pins to remove from the calibration clip, Fig. 47, noting the following:
a.
The rectangular end of the clip is the top, and pins are numbered 1-8 from top to bottom.
b.
Remove proper pins by bending them back and forth with long nose pliers, taking care not to bend adjacent pins.
5.
Insert calibration clip into rectangular slot in rear of cluster, Fig. 48, ensuring pins engage proper holes.
6.
Reinstall cluster and check system operation.
