PINPOINT TEST O: THE 4x4 SYSTEM JUMPS OUT OF GEAR
WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- O1 CHECK FOR OBSTRUCTED IWE VENT LINES
- Raise and support the vehicle on a hoist. REFER to JACKING & LIFTING .
- Disconnect the LH IWE line from the vent port.
- Attach a vacuum pump to the IWE vent line.
- Attempt to draw and hold a vacuum. Repeat Steps 1, 2 and 3 for the RH side of the vehicle.
- Can a vacuum be held on either IWE vent line?
NOTE: The IWE vent port is the smaller of the 2 vacuum ports.- Yes : INSTALL new IWE vent lines as necessary.
- No : GO to O2.
- O2 VERIFY THE CONCERN
- Drive the vehicle and attempt to duplicate the concern.
- Is the concern an uncommanded range shift (in or out of low range)?
- Yes : GO to O5.
- No : GO to O3.
- O3 CHECK THE MODE SELECT SWITCH (MSS) POSITION PIDS
- Key in OFF position.
- Connect the scan tool.
- Key in ON position.
- Drive the vehicle.
- Dynamically monitor the MSS PID while driving the vehicle in each shift position.
- Does the MSS PID always agree with the switch position?
- Yes : GO to O4.
- No : GO to PINPOINT TEST L .
- O4 CHECK FOR DTCs
- Carry out the on-demand self test.
- Are DTCs present?
- Yes : REFER to the 4X4 MODULE (PCM) DTC INDEX .
- No : GO to PINPOINT TEST Q .
- O5 CHECK THE 4x4 INDICATORS
- Stop the vehicle.
- Transmission in NEUTRAL.
- Depress the brake pedal.
- Observe the 4x4 indicators in the instrument cluster while cycling through each MSS position.
- Do the 4x4 indicators match MSS switch positions?
- Yes : GO to O3.
- No : GO to O6.
- O6 CHECK FOR DTCs
- Transmission in PARK.
- Release the brake pedal.
- Carry out the on-demand self test.
- Are DTCs present?
- Yes : REFER to the 4X4 MODULE (PCM) DTC INDEX .
- No : CHECK the transfer case fluid level. REFER to TRANSFER CASE . If the fluid level is okay, CHECK for internal transfer case faults. REFER to TRANSFER CASE .