Pinpoint Test C : The Transfer Case Jumps Out Of Gear
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- C1 CHECK FOR OBSTRUCTED IWE VENT LINES
- With the vehicle in NEUTRAL, position it on a hoist. REFER to: Jacking and Lifting - Overview .
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NOTE: The IWE vent port is the smaller of the 2 vacuum ports.
Disconnect the LHIWE line from the vent port.
- Attach a vacuum pump to the IWE vent line and attempt to hold a vacuum.
- Disconnect the RHIWE line from the vent port.
- Attach a vacuum pump to the IWE vent line and attempt to hold a vacuum.
Can a vacuum be held on either IWE vent line?
Yes INSTALL new IWE vent lines as necessary. No GO to C2 - C2 CHECK THE MSS POSITION MONITORING THE TCCM 4WD SWITCH STATUS (4X4_SW) PID
- Ignition ON.
- Enter the following diagnostic mode: TCCM Datalogger.
- Drive the vehicle.
- Dynamically monitor the 4X4_SW PID while driving the vehicle in each shift position.
Does the 4X4_SW PID always agree with the switch position?
Yes GO to C3 No GO to Pinpoint Test L - C3 CHECK THE 4WD INDICATORS
- Stop the vehicle.
- Transmission in NEUTRAL.
- Depress the brake pedal.
- Observe the 4WD indication in the message center while cycling through each MSS position.
Does the 4WD indicator(s) match the MSS?
Yes GO to C4 No To diagnose the 4WD, REFER to: Instrumentation, Message Center and Warning Chimes . - C4 CHECK FOR TCCM DTCS
- Transmission in PARK.
- Enter the following diagnostic mode: TCCM Self-Test.
Are any DTCs present?
Yes REFER to the DTC Chart: Transfer Case Control Module (TCCM) . No CHECK the transfer case fluid level. If the fluid level is OK, CHECK for internal transfer case faults. REFER to: Transfer Case .