Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 2004 >> Explorer 4WD V6-4.0L VIN E >> Repair and Diagnosis >> Transmission and Drivetrain >> Transfer Case >> Testing and Inspection >> Pinpoint Tests >> Test F
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

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:




pro multis · About Operation CHARM