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Clutch Pressure Test

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.
CLUTCH PRESSURE CHART 4.2L/4.6L

Transmission Pressures with TP at 1.5 Volts and Vehicle Speed Above 8 Km/h (5 MPH)
Gear EPC Tap (1) Line Pressure Tap Forward Clutch Tap Intermediate Clutch Tap Direct Clutch Tap
M1 124-241 kPa (18-35 psi) 517-655 kPa (75-95 psi) 413-586 kPa (60-85 psi) 0-34 kPa (0-5 psi) 0-34 kPa (0-5 psi)
M2 275-344 kPa (40-50 psi) 689-813 kPa (100-118 psi) 620-744 kPa (90-108 psi) 648-779 kPa (94-113 psi) 0-34 kPa (0-5 psi)
1 124-241 kPa (18-35 psi) 496-606 kPa (72-88 psi) 413-606 kPa (60-88 psi) 0-34 kPa (0-5 psi) 0-34 kPa (0-5 psi)
2 275-344 kPa (40-50 psi) 662-772 kPa (96-112 psi) 662-772 kPa (96-112 psi) 662-778 kPa (96-113 psi) 0-34 kPa (0-5 psi)
3 275-344 kPa (40-50 psi) 717-772 kPa (104-112 psi) 717-772 kPa (104-112 psi) 717-772 kPa (104-112 psi) 717-772 kPa (104-112 psi)
4 241-310 kPa (35-45 psi) 606-717 kPa (88-104 psi) 0-34 kPa (0-5 psi) 606-717 kPa (88-104 psi) 606-717 kPa (88-104 psi)
(1) EEC readings will vary due to EEC strategy. These values are approximate pressures depending on circuit leakage. Actual clutch apply pressures should be within 0-103 kPa (0-15 psi) of line pressure. For additional information on testing, refer to the CLUTCH PRESSURE TEST .
CLUTCH PRESSURE CHART 5.4L

Transmission Pressures with TP at 1.5 Volts and Vehicle Speed Above 8 Km/h (5 MPH)
Gear EPC Tap (1) Line Pressure Tap Forward Clutch Tap Intermediate Clutch Tap Direct Clutch Tap
M1 275-344 kPa (40-50 psi) 689-827 kPa (100-120 psi) 620-758 kPa (90-110 psi) 0-34 kPa (0-5 psi) 0-34 kPa (0-5 psi)
M2 241-310 kPa (35-45 psi) 620-689 kPa (90-100 psi) 551-689 kPa (80-100 psi) 586-724 kPa (85-105 psi) 0-34 kPa (0-5 psi)
1 275-344 kPa (40-50 psi) 689-827 kPa (100-120 psi) 620-758 kPa (90-110 psi) 0-34 kPa (0-5 psi) 0-34 kPa (0-5 psi)
2 241-310 kPa (35-45 psi) 620-689 kPa (90-100 psi) 551-689 kPa (80-100 psi) 586-724 kPa (85-105 psi) 0-34 kPa (0-5 psi)
3 241-310 kPa (35-45 psi) 620-689 kPa (90-100 psi) 551-689 kPa (80-100 psi) 586-724 kPa (85-105 psi) 551-689 kPa (80-100 psi)
4 241-310 kPa (35-45 psi) 620-689 kPa (90-100 psi) 0-34 kPa (0-5 psi) 586-724 kPa (85-105 psi) 551-689 kPa (80-100 psi)
(1) EEC readings will vary due to EEC strategy. These values are approximate pressures depending on circuit leakage. Actual clutch apply pressures should be within 0-103 kPa (0-15 psi) of line pressure. For additional information on testing, refer to the 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.

    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.
  1. Attach 0-2068 kPa (0-300 psi) pressure gauges to the line pressure tap and the appropriate clutch pressure tap according to the BAND AND CLUTCH APPLICATION CHART A  and/or BAND AND CLUTCH APPLICATION CHART 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.
  4. If the difference is greater than 103 kPa (15 psi), there is a leak in the corresponding clutch pressure circuit. The gauges on the line pressure tap and clutch pressure tap can be switched to confirm that gauge calibration differences are not the cause. Carry out the appropriate procedure to correct the clutch leak problem.
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