Test F

Pinpoint Test F: 4WD System Functional Test

Normal Operation

When the vehicle is operating in four-wheel drive high or low, (4H/4L), all four wheels rotate at the same speed. The amount of traction the vehicle can achieve depends on the amount of traction each tire can establish with the road surface. In order for the 4WD system to operate correctly, each wheel/tire assembly must have matching sizes, and the front and rear axle ratios must match.

Possible Causes

- 4x4 indicators
- 4x4 module (PCM)
- transfer case and related components
- wheel/tire assemblies

Note: 4H and 4L modes are no intended for driving on hard/dry surfaces.

Pinpoint Test F1 - F5:

Pinpoint Test F6 - F9:

Pinpoint Test F10 - F16:

Pinpoint Test F17 - F21: