Pinpoint Test O: ESOF Functional Test

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: 4X4 High or Low is not intended for driving on hard/dry surfaces.

O1 CHECK FOR 4X4 INDICATOR PROVE OUT
- Ignition ON.
- Do the 4X4 indicators illuminate at prove out?
- Yes: GO to O2 .
- No: CHECK the Instrument Cluster (IC) for faults. REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION .
O2 CHECK 2WD OPERATION
- Stop the vehicle.
- Transmission in NEUTRAL.
- Switch the Mode Select Switch (MSS) to 2WD .
- Do the Four-Wheel Drive (4WD) indicators turn off?
- Yes: GO to O4.
- No: GO to O3 .
O3 CHECK FOR 4X4 CONTROL MODULE DTCs
- Transmission in PARK.
- Connect the scan tool.
- Enter the following diagnostic mode on the scan tool: Self Test - 4X4 Control Module.
- Are DTCs retrieved?
- Yes: REFER to the 4X4 CONTROL MODULE DTC CHART .
- No: GO to O4 .
O4 CHECK FOR WIND UP IN TURNS IN 2WD
- Drive the vehicle on a dry, hard surface while executing turns.
- Is wind up present in turns?
- Yes: GO to PINPOINT TEST I .
- No: GO to O5 .
O5 CHECK 4X4 HIGH OPERATION
- Stop the vehicle.
- Transmission in NEUTRAL.
- Lock the LH and RH PVH .
- Switch the MSS to 4X4 High.
- Does the 4X4 High indicator illuminate correctly?
- Yes: GO to O9.
- No: GO to O6 .
O6 CHECK FOR RETURN 4X4 CONTROL MODULE DTCs
- Transmission in PARK.
- Enter the following diagnostic mode on the scan tool: Self Test - 4X4 Control Module.
- Are DTCs retrieved?
- Yes: REFER to the 4X4 CONTROL MODULE DTC CHART .
- No: GO to O7 .
O7 CHECK FOR WIND UP IN TURNS IN 4X4 HIGH
- Drive the vehicle in 4X4 High while executing turns.
- Is wind up present?
- Yes: GO to O8 .
- No: GO to PINPOINT TEST I .
O8 CHECK FOR STRAIGHTLINE WIND UP IN 4X4 HIGH
- Drive the vehicle on a dry, hard surface while driving in a straight line.
- Is wind up present?
- Yes: GO to PINPOINT TEST M .
- No: GO to O9 .
O9 CHECK FOR LH AND RH PVH DISENGAGEMENT
- NOTE: The engine must be at idle during the following steps to supply vacuum for PVH engagement/disengagement.
- With the vehicle in NEUTRAL, position it on a hoist.
  Refer to JACKING & LIFTING .
- Start the engine and allow to idle.
- Rotate the LH front tire one revolution forward and one revolution backward while observing the LH front axle shaft and U-joint.
- Rotate the RH front tire one revolution forward and one revolution backward while observing the RH front axle shaft and U-joint.
- Does the LH or RH front axle shaft rotate?
- Yes: GO to PINPOINT TEST H .
- No: GO to O10 .
O10 CHECK FOR PVH VACUUM LEAKS
- Ignition OFF.
- Disconnect both vacuum tubes from the PVH solenoid.
- Using a vacuum pump, apply 508 mm (20 in) Hg of vacuum to the PVH vacuum circuit.
- Observe the vacuum reading.
- Did the vacuum drop more than 25 mm (0.98 in) Hg per minute?
- Yes: CHECK the PVH and related components for leaks. GO to PINPOINT TEST H .
- No: CONNECT the PVH solenoid vacuum lines and GO to O11 .
O11 CHECK 4X4 LOW OPERATION
- Bring the vehicle to a speed below 8 km/h (5 mph). With the transmission in NEUTRAL (or clutch applied), switch the MSS to 4X4 Low.
- Does the 4X4 Low indicator illuminate correctly?
- Yes: GO to O13.
- No: GO to O12 .
O12 CHECK FOR DTCs
- Transmission in PARK.
- Enter the following diagnostic mode on the scan tool: Self Test - 4X4 Control Module.
- Are DTCs retrieved?
- Yes: REFER to the 4X4 CONTROL MODULE DTC CHART .
- No: GO to O13 .
O13 CHECK FOR WIND UP IN TURNS IN 4X4 LOW
- Drive the vehicle on a dry, hard surface while turning.
- Is wind up present and 4X4 Low operating?
- Yes: GO to O14 .
- No: CHECK for 4X4 control module DTCs. REFER to INSPECTION AND VERIFICATION . If no DTCs are present, GO to PINPOINT TEST J .
O14 CHECK FOR STRAIGHTLINE WIND UP IN 4X4 LOW
- Drive the vehicle in 4X4 Low while driving in a straight line.
- Is wind up present?
- Yes: GO to PINPOINT TEST N .
- No: GO to O15 .
O15 CHECK 4X4 LOW TO 2WD SHIFT
- With the vehicle at a stop and transmission in NEUTRAL, switch the MSS from 4X4 Low to 2WD .
- Do the 4WD indicators turn off?
- Yes: GO to O17.
- No: GO to O16 .
O16 CHECK FOR DTCs
- Transmission in PARK.
- Enter the following diagnostic mode on the scan tool: Self Test - 4X4 Control Module.
- Are DTCs retrieved?
- Yes: REFER to the 4X4 CONTROL MODULE DTC CHART .
- No: GO to O17 .
O17 CHECK FOR WIND UP IN TURNS IN 2WD
- Drive the vehicle on a dry, hard surface while executing turns.
- Is wind up present in turns?
- Yes: GO to PINPOINT TEST J .
- No: GO to O18 .
O18 CHECK FOR LH AND RH PVH DISENGAGEMENT
- NOTE: The engine must be at idle during the following steps to supply vacuum for PVH engagement/disengagement.
- With the vehicle in NEUTRAL, position it on a hoist. REFER to JACKING & LIFTING .
- Start the engine and allow to idle.
- Rotate the LH front tire one revolution forward and one revolution backward while observing the LH front axle shaft and U-joint.
- Rotate the RH front tire one revolution forward and one revolution backward while observing the RH front axle shaft and U-joint.
- Does the LH or RH front axle shaft rotate?
- Yes: GO to PINPOINT TEST H .
- No: GO to O19 .
O19 CHECK FOR PVH VACUUM LEAKS
- Ignition OFF.
- Disconnect both vacuum tubes from the PVH solenoid.
- Using a vacuum pump, apply 508 mm (20 in) Hg of vacuum to the PVH apply vacuum circuit.
- Observe the vacuum reading.
- Did the vacuum drop more than 25 mm (0.98 in) Hg per minute?
- Yes: CHECK the PVH and related components for leaks. GO to PINPOINT TEST H .
- No: CONNECT the PVH solenoid vacuum lines and GO to O20 .
O20 CHECK FOR PVH VACUUM LEAKS
- Switch the MSS to 2WD .
- Drive the vehicle on the road and shift from 2WD to 4X4 High while driving above 32 km/h (20 mph).
- Does the transfer case shift to 4X4 High satisfactorily?
- Yes: The 4X4 system is operating correctly.
- No: GO to PINPOINT TEST L .