Test G FORD MUSTANG 2003 Workshop Manual

a
EPC readings will vary due to EEC strategy. These values are approximate pressures. Actual clutch
apply pressures should be within 69- 103 kPa (10-15 psi) of line pressure. For additional information on
testing, refer to the Clutch Pressure Test in this section.
3. Place the ignition switch in the OFF position. If line pressure is not within specification, check EPC pressure.
4. Connect pressure gauge to EPC pressure tap.
5. Start engine and check EPC pressure. Use the line pressure chart for specifications.
6. If EPC pressure is not within specification, Go To Pinpoint Test E to diagnose EPC operation. If
EPC operation is OK, see the line pressure diagnosis chart for line pressure concern causes. (25-
35 psi) 95 psi) 85 psi) psi)
2 103-
241 kPa
(15-25 psi) 413-
544 kPa (60-
79 psi) 344-
482 kPa (50-
70 psi) 379-
517 kPa (55- 75
psi) 0-
34 kPa (0- 5
psi) 3 172-
241 kPa
(25-35 psi) 517-
655 kPa (75-
95 psi) 372-
579 kPa (54-
84 psi) 482-
613 kPa (70- 89
psi) 379-
586 kPa
(55-85 psi) 4 241-
310 kPa
(35-45 psi) 620-
758 kPa (90-
110 psi) 0-
34 kPa (0-5
psi) 586-
730 kPa (85-
105 psi) 551-689 kPa
(80-100 psi)
Line Pressure Diagnosis Chart Test Results Possible Source
High At Idle —
In All
Positions ·
Wiring Harnesses ·
Run Quick Test. Refer to the Powertrain Control/Emissions Diagnosis
(PC/ED) manual. ·
EPC Solenoid ·
Main Regulator Valve Low At Idle —
In All
Positions ·
Low Fluid Level ·
Control Bodies ·
Leakage in Pump ·
Damaged Gaskets on Separator Valve ·
Damaged Separator Plate ·
Restricted Inlet Filter ·
Case Bolts ·
Loose Main Control Valve Body ·
EPC Solenoid O- Ring ·
EPC Solenoid Bracket ·
Case ·
Sticking Main Regulator Valve ·
Damaged Inlet Tube Seal on Inlet Filter Low In Park Only ·
Valve Body ·
Low/Reverse Servo Low In Reverse Only ·
Separator Plate ·
Low/Reverse Servo or Valve Bodies Klj . 3 ba
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Stall Speed Test
WARNING: Apply the parking brake firmly while carrying out each stall test.
CAUTION: Carry out line pressure test prior to carrying out stall test. If the line pressure is
low at stall, do not carry out stall test or further transmission damage will occur.
The stall speed test checks:
zthe torque converter clutch operation and installation.
z the holding ability of the forward clutch.
z the reverse clutch (the low- reverse bands).
z the planetary one- way clutch.
z the engine driveability.
Conduct this test with the engine coolant and transmission fluid at correct levels and at normal
operating temperature.
Apply the parking brake firmly for each stall speed test. 1. Find the specified stall rpm for the vehicle; see the stall speed diagnosis chart. Use a grease pencil to mark the rpm on the dial of a tachometer.
2. Connect a tachometer to the engine.
3. NOTE: If the rpm recorded by the tachometer exceeds the maximum limits, release the
accelerator pedal immediately because clutch or band slippage is indicated.
In each of the following ranges (D), 2, 1, R, press the accelerator pedal to the floor and hold it ·
Reverse Clutch Low In Neutral Only ·
Valve Body Low In Overdrive Only ·
Forward Clutch ·
Valve Body Low In 1st Position Only ·
Forward Clutch ·
Valve Body ·
Low/Reverse Servo Low In 2nd Only ·
Intermediate Clutch ·
Valve Bodies ·
Forward Clutch Stall Speed
Application Min. Max.
3.8L engine 2,240 2,619
4.6L 2V engine 2,339 2,738
4.6L 4V MACH 1 engine 2,375 2,767 Klj . 4 ba
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just long enough to let the engine get to wide open throttle (WOT). While making this test, do
not hold the throttle open for more than 5 seconds at a time.
4. Note the results in each range.
5. After each range, move the shift control selector lever to NEUTRAL and run the engine at 1,000 rpm for about 15 seconds to cool the torque converter before making the next test.
6. Refer to the stall speed diagnosis chart for corrective actions.
Air Pressure Tests
Transmission Air Test Plate Stall Speed Diagnosis Chart Selector
Position
Stall Speeds High Stall Speeds Low
(D) Planetary One-
Way Clutch (D), 2 and 1 Forward Clutch or Intermediate
Clutch
(D), 2, 1 and
R Carry Out Pressure Test Torque Converter Stator One-
Way Clutch or
Engine Driveability Concerns R Reverse Clutch or Low Reverse
Band or Servo
Item Part Number Description
1 — Converter bypass
2 — Direct clutch
3 — Forward clutch
4 — 2-
3 accumulator, top 5 — 2-
3 accumulator, bottom 6 — Reverse servo
7 — Overdrive servo, apply
8 — Overdrive servo, release
9 — Intermediate clutch
10 — Reverse clutch
11 — 1-
2 accumulator, apply Klj . 5 ba
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A no-
drive condition can exist even with correct transmission fluid pressure because of inoperative
clutches or bands. An erratic shift can be located through a series of checks by substituting air
pressure for fluid pressure to determine the location of the malfunction.
Follow the procedure to determine the location of the inoperative clutch or band by introducing air
pressure into the various test plate passages.
NOTE: Use only dry, regulated 276 kPa (40 psi) maximum air pressure.
Apply air to the appropriate passage(s). A dull thud should be felt or heard or movement could be
observed when the clutch component applies. There should be no hissing sound when the component
is applied.
Cover the vent hole in the test plate with a clean, lint- free shop towel to prevent spray when the air is
applied. Plugging the vent hole during testing will result in inaccurate results.
1. Drain transmission fluid and remove the transmission fluid pan.
2. Remove the main control valve body.
3. Install transmission test plate and gasket. Tighten bolts to 10 Nm (89 lb- in).
4. NOTE: Do not apply air to the test plate vent hole.
Apply air to the appropriate clutch port (refer to the Transmission Air Test Plate illustration). A
dull thud may be heard or movement felt when the component is applied or released. If clutch
seals or check balls are leaking a hissing sound may be heard.
If the servos do not operate, disassemble, clean and inspect them to locate the source of the concern.
If air pressure applied to the clutch passages fails to operate a clutch, or operates clutches
simultaneously, inspect the fluid passages in the case.
If air pressure applied to the accumulator fails to operate an accumulator, remove and inspect case
passages and piston.
Clutch Pressure Test
The Clutch Pressure Test will diagnose a low- pressure condition or leakage in a clutch circuit. A
difference of 103 kPa (15 psi) or more between the clutch pressure and line pressure will prevent a
normal shift.
1. CAUTION: Pressure gauges affect the shift quality of the transmission. Care must
be taken not to accelerate or decelerate rapidly. Possible transmission failure can result.
Attach 0- 2068 kPa (0- 300 psi) pressure gauges to the line pressure tap and the appropriate
clutch pressure tap according to Band and Clutch Application Chart A&B. Gauges must be
accurate enough to distinguish a 103 kPa (15 psi) difference. (If this test is done in conjunction
with a control pressure test, pressure gauges will be attached to all pressure taps.) Have
sufficient flexible hose available to read the gauges in the vehicle.
2. Drive the vehicle. When pressure is applied to the clutch, note the difference between the line pressure gauge and the corresponding clutch pressure gauge.
3. If the difference in pressures is less than 103 kPa (15 psi), the corresponding clutch circuit does not have a pressure loss. The gauges on the line pressure tap and appropriate clutch pressure
tap can be switched to confirm that gauge calibration differences are not the cause. Klj . 6 ba
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DIAGNOSIS AND TESTING
Leakage Inspection
CAUTION: Do not try to stop the fluid leak by increasing the torque beyond specifications.
This may cause damage to the case threads.
Check the fluid filler tube connection at the transmission case. If leakage is found here, install a new
grommet.
Check the VSS plug or VSS sensor O-ring (model dependent). If leakage is found install a new O- ring.
Check fluid lines and fittings between the transmission and the cooler in the radiator tank for
looseness, wear, or damage. If leakage cannot be stopped by tightening a fluid tube nut, install new
parts. When fluid is found leaking between the case and cooler line fitting, check for missing or
damaged O- ring, then tighten the fitting to maximum specification.
If the leak continues, install a new cooler line fitting and tighten to specification. The same procedure
should be followed for fluid leaks between the radiator cooler and the cooler line fittings in this section;
refer to Section 307 - 02 .
Check the engine coolant in the radiator. If transmission fluid is present in the coolant, the cooler in the
radiator is probably leaking.
The cooler can be further checked for leaks by disconnecting the lines for the cooler fittings and
applying no more than 345 kPa (50 psi) air pressure to the fittings. Remove the radiator cap to relieve
the pressure buildup at the exterior of the oil cooler tank. If the cooler is leaking and or will not hold
pressure, install a new cooler.
If leakage is found at the transmission range selector lever, install a new seal.
If leakage is found at the transmission internal harness connector, install a new O- ring. 4R70W External Sealing SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
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following areas of possible leakage should also be checked to determine if engine oil leakage is
causing the concern.
a. Leakage at the engine valve cover gasket may allow oil to flow over the torque converter housing or seep down between the torque converter housing and cylinder block causing oil to
be present in or at the bottom of the torque converter housing.
b. Oil galley plug leaks will allow oil to flow down the rear face of the cylinder block to the bottom of the torque converter housing.
c. Leakage at the crankshaft rear oil seal will work back to the flexplate, and then into the torque converter housing.
d. Leakage at engine oil pressure sensor.
Leak Check Test 1. Remove the fluid level indicator and note the color of the fluid. Original factory fill fluid is dyed red to aid in determining if leakage is from the engine or transmission. Unless a considerable
amount of makeup fluid has been added or the fluid has been changed, the red color should
assist in pinpointing the leak.
2. Remove the torque converter housing cover. Clean off any fluid from the top and bottom of the torque converter housing, front of the case and rear face of the engine and oil pan. Clean the
torque converter area by washing with a suitable nonflammable solvent and blow dry with
compressed air.
3. Wash out the torque converter housing, the front of the flexplate and the converter drain plugs. The torque converter housing may be washed out using cleaning solvent and a squirt- type oil
can. Blow all washed areas dry with compressed air.
4. Start and run the engine until the transmission reaches its normal operating temperature. Observe the back of the cylinder block and top of the torque converter housing for evidence of
fluid leakage. Raise the vehicle on a hoist; refer to Section 100 - 02 and run the engine at fast
idle, then at engine idle, occasionally shifting to the Overdrive and Reverse ranges to increase
pressure within the transmission. Observe the front of the flexplate, back of the cylinder block
(in as far as possible), and inside the torque converter housing and front of the case. Run the
engine until fluid leakage is evident and the probable source of leakage can be determined.
Leak Check Test With Black Light Used With 12 Volt Master UV Diagnostic Inspection Kit
Oil soluble aniline or fluorescent dyes premixed at the rate of 2.5ml (1/2 teaspoon) of dye powder to
0.235L (1/2 pint) of transmission fluid have proved helpful in locating the source of fluid leakage. Such
dyes may be used to determine whether an engine oil or transmission fluid leak is present, or if the
fluid in the fluid cooler leaks into the engine cooling system. A black light must be used with the
fluorescent dye solution. Klj . 4 ba
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DIAGNOSIS AND TESTING
Transmission Fluid Cooler
CAUTION: Whenever a transmission has been disassembled to install new parts, the
cooler bypass valve (CBV), all transmission fluid coolers (in tank and auxiliary) and
transmission fluid cooler lines must be cleaned and backflushed. Use a suitable the torque
converter/fluid cooler cleaner.
NOTE: Cleaning and backflushing the transmission fluid cooling system along with following all the
normal cleaning and inspection procedures in this section during disassembly and reassembly will
keep contamination from reentering the transmission and causing a repeat repair.
When internal wear or damage has occurred in the transmission, metal particles, clutch plate material,
or band material may have been carried into the torque converter and transmission fluid cooler. These
contaminants are a major cause of recurring transmission troubles and must be removed from the
system before the transmission is put back into use.
Transmission Fluid Cooler Flow Test
NOTE: The transmission linkage/cable adjustment, fluid level and line pressure must be within
specification before carrying out this test. Refer to Section 307 - 05 for adjustments.
1. Remove fluid level indicator from fluid filler tube.
2. Place funnel in fluid filler tube.
3. Position the vehicle on a hoist. For additional information, refer to Section 100 - 02 .
4. Remove the cooler return line (top fitting) from the fitting on the transmission case.
5. Connect one end of a hose to the cooler return line and route other end of the hose up to a point where it can be inserted into the funnel at the fluid filler tube.
6. Remove the safety stands and lower the vehicle. Insert end of hose into the funnel.
7. Start the engine and run it at idle with the transmission in NEUTRAL.
8. When fluid flows from the hose in a steady stream, a liberal amount of fluid should be observed. "Liberal" is about 1 liter (1 quart) delivered in 15 seconds. If a liberal flow is observed, the test is
complete.
9. If the flow is not liberal, stop the engine. Disconnect the hose from the cooler return line and connect it to the converter outlet fitting (bottom fitting) on the transmission case.
10. Repeat steps 6 and 7. If flow is now approximately 1 liter (1 quart) in 15 seconds, refer to Transmission Fluid Cooler — Backflushing and Cleaning in this section. If the flow is still not
approximately 1 liter (1 quart) in 15 seconds, repair or install pump and or converter.
For the installation of new transmission fluid cooler or tubes, refer to Section 307 - 02 .
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Klj . 1 ba
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DIAGNOSIS AND TESTING
Diagnosis By Symptom
SECTION 307-
01: Automatic Transaxle/Transmission 2003 Mustang Workshop Manual Special Tool(s)
Transmission Fluid Pressure
Gauge
307-
004 (T57L-77820- A) Air Test Plate, Transmission
307-
246 (T92P-7006- A) Breakout Box, EEC-V Control
System
418- 049 (T94L-50- EEC-V) or
equivalent MLP-
TR Cable
418- F107 (007- 00111) or
equivalent Worldwide Diagnostic System
(WDS)
418-
F224
New Generation STAR (NGS)
Tester
418- F052 or equivalent scan
tool Transmission Tester
307-
F016 (007- 00130) or
equivalent Trans Tester TR/MLP Overlay
and Manual
007-
00131 or equivalent 73 III Automotive Meter Klj . 1 ba
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The Diagnosis by Symptom charts give the technician diagnostic information, direction, and suggest
possible components, using a symptom as a starting point.
The Diagnosis by Symptom charts are divided into two categories: Electrical Routines, indicated by
200 series numbers, and Hydraulic/Mechanical Routines, indicated by 300 series numbers. The
Electrical Routines list the possible electrical components that could cause or contribute to the
symptom described. The Hydraulic/Mechanical Routines list the possible hydraulic or mechanical
components that could cause or contribute to the symptom described.
Diagnosis by Symptom Chart Directions
1. Using the Diagnosis by Symptom Index, select the Concern/Symptom that best describes the condition.
2. Refer to the routine indicated in the Diagnosis by Symptom Index.
3. Always begin diagnosis of a symptom with:
a. preliminary inspections.
b. verifications of condition. c. checking the fluid levels.
d. carrying out other test procedures as directed.
4. NOTE: Not all concerns and conditions with electrical components will set a diagnostic trouble
code (DTC). Be aware that the components listed may still be the cause. Verify correct function
of these components prior to proceeding to the Hydraulic/Mechanical Routine listed.
Begin with the Electrical Routine, if indicated. Follow the reference or action required
statements. Always carry out the on- board diagnostic tests as required. Never skip steps.
Repair as required. If the concern is still present after electrical diagnosis, then proceed to the
Hydraulic/Mechanical Routine listed.
5. The Hydraulic/Mechanical Routines list possible hydraulic or mechanical components that could cause the concern. These components are listed in the removal sequence and by most
probable cause. All components listed must be inspected to ensure correct repair. 105-
R0057 or equivalent UV Leak Detector Kit
164-
R0756 or equivalent
Diagnosis by Symptom Index Title Routines
Electrical
a Hydraulic/
Mechanical Klj . 2 ba
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·
Seals, piston damaged ·
Inspect for damage. Repair as required. ·
Check ball missing or
damaged ·
Friction elements damaged
or worn Low/Reverse Band
·
Band, servo, anchor pins
damaged or worn ·
Inspect for damage. Repair as required.
Engagement Concern: Harsh Reverse Possible Component Reference/Action
203 —
ELECTRICAL ROUTINE Powertrain Control System
·
Electrical inputs/outputs,
vehicle wiring harnesses,
PCM, TFT sensor, EPC
solenoid ·
Carry out Self-Test; refer to the Powertrain Control/Emissions
Diagnosis (PC/ED) manual for diagnosis and testing of the
Powertrain Control System. Carry out engagement test, EPC test
and Go To Pinpoint Test B or
Go To Pinpoint Test D . Check idle
speed. Repair as required. Clear DTCs, road test and repeat Self-
Test. 303 —
HYDRAULIC/MECHANICAL ROUTINE Fluid
·
Incorrect level ·
Adjust fluid to correct level. ·
Condition ·
Inspect condition of fluid. Engine Driveline
·
Looseness in the
driveshaft, U- joints or the
engine mounts ·
Repair as required. Shift Linkage
·
Damaged or incorrectly
adjusted ·
Inspect and repair as required. Verify transmission shift cable
adjustment; refer to Section 307 - 05 . Adjust transmission shift
cable as necessary. After repairing transmission shift cable, verify
that the digital TR sensor is correctly adjusted. Adjust the digital
TR sensor as necessary. Incorrect Pressures
·
High line pressure, high
EPC pressure ·
Check pressure at line and EPC pressure taps; refer to Line
Pressure Chart for specifications. If high, check the following
components: main controls, oil filter and seal assembly. Fluid Filter and Seal
Assembly
·
Plugged or damaged ·
Install a new filter and seal assembly. ·
Filter seal damaged Main Controls
·
No. 6 shuttle ball, No. 5
check ball, manual valve,
main regulator valve stuck,
damaged or missing ·
Inspect for damage. Repair as required. ·
Bolts not tightened to
specifications ·
Tighten bolts to specifications. Klj . 6 ba
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