Line Pressure Test

Courtesy of FORD MOTOR COMPANY

Item	Service Part Number	Description
1	7A010	Line pressure tap
2	7A010	Transmission fluid drain plug

NOTE: Carry out the Line Pressure Test prior to 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 will occur. Do not maintain WOT in any transmission range for more than 5 seconds.

NOTE: Do not mistake the transmission fluid drain plug for the line pressure tap plug or the transmission fluid level will be low and will need to be refilled.

This test verifies the line pressure is within specification.

1.

Connect the transmission fluid pressure gauge to the line pressure tap.

2.

Start the engine and check the line pressure. Refer to the Pressure Chart to determine if the line pressure is within specification.

Pressure Chart

Gear	Line Pressure at Idle KPa (psi)		Line Pressure at WOT Stall KPa (psi)
Gear	Minimum	Maximum	Minimum	Maximum
P	344.7 kPa (50 psi)	448.2 kPa (65 psi)	-	-
R	551.6 kPa (80 psi)	689.5 kPa (100 psi)	1, 689.2 kPa (245 psi)	2, 068.4 kPa (300 psi)
N	344.7 kPa (50 psi)	448.2 kPa (65 psi)	-	-
D	482.6 kPa (70 psi)	620.5 kPa (90 psi)	1, 689.2 kPa (245 psi)	2, 068.4 kPa (300 psi)

3.

If the line pressure is not within specification, see the Line Pressure Diagnosis Chart for line pressure concerns.

4.

When the pressure tests are completed, install the line pressure tap plug.
- Tighten to 9 Nm (80 lb-in).

Line Pressure Diagnosis Chart

Test Results	Possible Source
HIGH at IDLE - ALL RANGES	Wiring Harnesses, PCA, Main Regulator Valve
LOW at IDLE - ALL RANGES	Low Fluid Level, Fluid Inlet Filter/Seal, Main Control Body, Cross Leaks, Gaskets, Pump, Separator Plate
LOW in Park ONLY	Valve Body
LOW in Reverse ONLY	Separator Plate, Reverse Clutch, Valve Body, Forward Clutch
LOW in Neutral ONLY	Valve Body
LOW in Drive with O/D ONLY	Forward Clutch, Valve Body
LOW in Manual Low ONLY	Forward Clutch, Valve Body