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Leakage Inspection > < Transmission-Transaxle Connector Layouts

Focus 2004.75 (07.2004-)

Automatic Transmission/Transaxle - Vehicles With: 4-Speed Automatic Transmission (4F27E) - Special Testing Procedures Focus 2004.75 (07/2004-)
Diagnosis and Testing

Special Tool(s)

Hydraulic Pressure Gauge (0–60 bar)

307-201

Adaptor for 301-201

307-201-01

Transmission Air Test Plate

307-412
General Equipment
Worldwide Diagnostic System (WDS)

The following tests are designed to aid the technician in diagnosing the hydraulic and mechanical portion of the transmission.

Engine Idle Speed Check

Refer to WDS to check the engine idle speed.

Line Pressure Test

CAUTION:
CAUTION:Carry out the line pressure test before carrying out the stall speed test. If the line pressure is low at stall, do not carry out the stall speed test or further transmission damage may occur.
CAUTION:
CAUTION:Do not maintain wide open throttle (WOT) in any gear range for more than 5 seconds.
  1. NOTE:
    NOTE:Certain sensor concerns may cause high powertrain control failure mode effect management actions. Make sure that all necessary electrical repairs have been completed before carrying out the line pressure test or test results may be incorrect.
    Carry out the transmission preliminary inspection.
    REFER to: Preliminary Inspection (307-01A Automatic Transmission/Transaxle - Vehicles With: 4-Speed Automatic Transmission (4F27E), Diagnosis and Testing).

  1. WARNING:
    WARNING:When removing the line pressure test point plug, take care to prevent scalding. Failure to follow this instruction may result in personal injury.
    Remove and discard the line pressure test point plug.

  1. Install the special tools.
  1. Start the engine and check the line pressures. Refer to the line pressure chart below to determine if the line pressures are within specification.
  1. If the line pressure is not within specification, refer to the line pressure diagnosis chart below for possible line pressure concern sources.

  1. Remove the special tools.

  1. Install a new line pressure test point plug.

Line Pressure Chart

Range Idle Stall
kPa psi kPa psi
"P" (PARK) and "N" (NEUTRAL) 345-450 50-65 1240-1450 180-210
"R" (REVERSE) 500-750 72-109 1600-2000 232-290
"D" (DRIVE) 345-450 50-65 1240-1450 180-210

Line Pressure Diagnosis Chart

Test Results Possible Source
Low pressure in all ranges Worn transmission fluid pump.
Fluid leaking from the transmission fluid pump, main control valve body or transmission fluid pan.
Pressure control solenoid inoperative.
Solenoid regulating valve sticking.
Low pressure in "D" only Fluid leaking from the forward clutch hydraulic line.
Low pressure in "D" and "R" only Fluid leaking from the low/reverse clutch hydraulic line.
Low pressure in "R" only Fluid leaking from the reverse clutch hydraulic line.
High pressure in all ranges Pressure control solenoid inoperative or open circuit wiring harness.
Pressure regulator valve sticking.
Powertrain control module (PCM) inoperative.

Stall Speed Test

CAUTION:
CAUTION:Make sure that the parking brake is fully applied while carrying out each stall speed test.
CAUTION:
CAUTION:Carry out the line pressure test before carrying out the stall speed test. If the line pressure is low at stall, do not carry out the stall speed test or further transmission damage may occur.
NOTE:
NOTE:The stall speed test should be carried out with the engine and transmission at normal operating temperatures.

The stall speed test will confirm correct operation of the following items:

  • torque converter clutch
  • forward clutch
  • low one-way clutch assembly
  • engine performance
  1. Using WDS, measure the engine rpm.
  1. CAUTION:
    CAUTION:After testing each of the following ranges "D" and "R", move the selector lever to the "N" position and run the engine at 1000 rpm for approximately 15 seconds to allow the torque converter to cool before testing the next range.
    CAUTION:
    CAUTION:Do not maintain wide open throttle (WOT) in any gear range for more than 5 seconds.
    CAUTION:
    CAUTION:If the recorded engine rpm exceeds the maximum specified rpm, release the accelerator pedal immediately. Torque converter clutch or transmission brake band slippage is indicated.
    NOTE:
    NOTE:This procedure may set diagnostic trouble codes (DTCs) P0712 and P1783. After carrying out the stall speed test, using WDS, carry out the on-board diagnostics (OBD) test and clear the DTCs from the memory.
    Press the accelerator pedal to the floor, WOT in each gear range. Record the rpm reached in each gear range. Stall speeds should be as follows:

Stall Speed Chart

Engine RPM
1.6L Duratec-16v (Sigma) 2200-2800
1.8L/2.0L Duratec-HE (MI4) 2200-2800
  1. If the stall speeds are too high, refer to the stall speed diagnosis chart below. If the stall speeds are too low, first check the engine idle speed. If the engine idle speed is OK, remove the torque converter and check the torque converter one-way clutch for slippage.

Stall Speed Diagnosis Chart

Gear Selector Lever Position Possible Cause
Above specification in "D" Forward clutch slipping.
Above specification in "D" and "R" Low/reverse clutch slipping.
Above specification in "R" Reverse clutch slipping.
Carry out a road test to determine whether the concern is in the low/reverse clutch.
Low/reverse clutch is slipping.

Air Pressure Tests

Transmission Air Test Plate

 
Item
Part Number
Description
1
—
Servo release
2
—
Servo apply
3
—
Direct clutch apply
4
—
Reverse clutch apply
5
—
Torque converter bypass
6
—
Low/reverse clutch
7
—
Torque converter charge
8
—
Forward clutch apply
9
—
Servo accumulator apply
10
—
Forward servo accumulator apply
NOTE:
NOTE:A no-drive condition can exist even with correct transmission fluid pressure due to inoperative clutches or bands. An erratic shift can be located by a series of checks substituting air pressure for fluid pressure to determine the location of the concern.
NOTE:
NOTE:Use only dry, regulated (40 psi maximum), air pressure.
  1. Remove the main control valve body.
    REFER to: Main Controls (307-01A Automatic Transmission/Transaxle - Vehicles With: 4-Speed Automatic Transmission (4F27E), In-vehicle Repair).

  1. NOTE:
    NOTE:Use the fluid pan retaining bolts to hold the transmission air test plate in position.
    Install the special tool.
    • Tighten the transmission fluid pan retaining bolts to 10 Nm.
  1. NOTE:
    NOTE:A dull thud should be felt, heard or movement may be observed when the component applies. There should be no hissing sound when the component is fully applied. If the clutch seals or check valves are leaking a hissing sound may be heard.
    Apply air pressure to the appropriate clutch port, refer to the transmission air test plate diagram in this procedure.
  1. If the test results indicate that the intermediate and overdrive brake band servo does not operate, clean and check the intermediate and overdrive brake band servo to locate the concern.
    REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: 4-Speed Automatic Transmission (4F27E), Disassembly).
  1. If the air pressure applied to the clutch passages fails to operate a clutch, or operates another clutch simultaneously, disassemble the transmission and use air pressure to check the fluid passages in the center support and clutches to detect obstructions.
    REFER to: Transaxle (307-01A Automatic Transmission/Transaxle - Vehicles With: 4-Speed Automatic Transmission (4F27E), Disassembly).

Leakage Inspection > < Transmission-Transaxle Connector Layouts