Pinpoint Test R : The 4WD System Jumps Out Of Gear
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- R1 CHECK FOR OBSTRUCTED IWE VENT LINES
- With the vehicle in NEUTRAL, position it on a hoist. Refer to Jacking and Lifting .
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NOTE: The IWE vent port is the smaller of the 2 vacuum ports.
Disconnect the LH IWE line from the vent port.
- Attach a hand vacuum pump to the IWE vent line.
- Attempt to draw and hold a vacuum.
- Connect the LH IWE line.
- Disconnect the RH IWE line from the vent port.
- Attempt to draw and hold a vacuum.
Can a vacuum be held on either IWE vent line?
Yes INSTALL new IWE vent lines as necessary. No GO to R2. - R2 CHECK THE 4WD SWITCH POSITION (4X4_SW) PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: TCCM DataLogger.
- Drive the vehicle.
- Monitor the 4X4_SW PID while driving the vehicle in each MSS position.
MSS Position PID Status 2H 2WD 4A Automatic 4H 4WD-HIGH 4L 4WD-LOW
Does the PID always agree with the MSS position?
Yes GO to R3. No GO to Pinpoint Test N . - R3 CHECK THE 4WD INDICATORS
- Stop the vehicle.
- Shift the transmission into the NEUTRAL position.
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NOTE: 2H is indicated by the absence of 4X4 AUTO, 4H or 4L mode indicators in the IPC message center.
Observe the 4WD indicators in the IPC while cycling through each MSS position.
Do the 4WD indicators match MSS switch positions?
Yes GO to Pinpoint Test N . No GO to R4. - R4 CHECK FOR TCCM DTC s
- Shift the transmission into the PARK position.
- Enter the following diagnostic mode on the scan tool: TCCM Self-Test.
Are DTCs present?
Yes REFER to the TCCM DTC Chart . No CHECK the transfer case fluid level. REFER to Transfer Case . If the fluid level is OK, CHECK for internal transfer case faults. REFER to Transfer Case .