Ford Fusion: Automatic Transmission - 6-Speed Automatic Transmission – 6F35 / Transmission Line Pressure Test. Diagnosis and Testing
Line Pressure Test
NOTE:
Perform the line pressure test prior to performing the stall
speed test. If the line pressure is low at stall, do not perform the
stall speed test or transmission damage will occur. Do not maintain WOT in any transmission range for more than 5 seconds.
This test verifies the line pressure is within specification.
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Remove the 2 bolts and position aside the air cleaner top assembly.
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Remove the air cleaner bottom assembly.
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Connect the air cleaner bottom assembly to the air cleaner top assembly.
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Connect the transmission fluid pressure gauge (307-004) to the line pressure tap.
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Start the engine and check the line pressure.
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Compare LINEDSD# to actual measured pressure. Actual
measured pressure should be within 10 PSI (69 kPa). Raise engine RPM to
2000 RPM, Verify LPC operation by monitoring LINE pressure while commanding LINEDSD# up and down.
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If the line pressure is not within specification, see the Line Pressure Diagnosis Chart for possible source.
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When the pressure tests are complete, install the line pressure tap plug.
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Torque: 18 Nm (159 lb-in).
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Disconnect the air cleaner bottom assembly from the air cleaner top assembly.
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Install the air cleaner bottom assembly.
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Position back the air cleaner top assembly and install the 2 bolts.
Line Pressure Diagnosis Chart
Test Results
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Possible Source
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HIGH at IDLE
|
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Wiring Harnesses (open circuit/high resistance to LPC) LPC solenoid mechanically stuck ON
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Verify LPC operation by monitoring LINE pressure while commanding LINEDSD# up and down
|
Main pressure regulator valve stuck in default position
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LOW at IDLE
|
Low Transmission Fluid level
|
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LPC solenoid mechanically stuck OFF
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Verify LPC operation by monitoring LINE pressure while commanding LINEDSD# up and down
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Fluid Inlet Filter/Seal
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Main pressure regulator valve stuck in spring compressed position
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Broken or missing main pressure regulator valve spring
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Pump
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Transmission Air Pressure Test
Item
Description
1
Foward clutch
2
Direct clutch
3
Intermediate clutch
4
Low reverse clutch
5
Overdrive clutch
NOTE:
The center support contains an air bleed for the forward and
Low reverse clutch circuits...
Stall Speed Test
WARNING:
Block all wheels, set the parking brake and firmly apply the
service brake to reduce the risk of vehicle movement during this
procedure...
Other information:
Removal
Disconnect the battery cables.
Refer to: Battery Disconnect and Connect (414-01 Battery, Mounting and Cables, General Procedures).
Remove the battery.
Installation
To install, reverse the removal procedure...
B0011:11, B0011:12, B0011:13 and B0011:1A
Refer to Wiring Diagrams Cell 46 for schematic and connector information.
Normal Operation and Fault Conditions
The RCM continuously monitors the passenger airbag stage 2 circuits for the following faults:
Resistance out of range
Unexpected voltage
Short to ground
Faulted passenger airbag
If a fault is detected, t..