Line Pressure Test

CAUTION: 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 stall speed test or further transmission damage will occur. Do not maintain WOT in any transmission range for more than five seconds.

This test verifies that the line pressure is within specification.

Connect pressure gauge to line pressure tap.

Start engine and check line pressures. Refer to LINE PRESSURE CHART to determine if line pressure is within specification.

LINE PRESSURE CHART

Application	Range	Idle		WOT Stall
Application	Range	EPC	Line Pressure	EPC	Line Pressure
4.6L	P, N, OD, 2, 1	207-276 kPa (30-40 psi)	552-689 kPa (80-100 psi)	689-758 kPa (100-110 psi)	1310 -1448 kPa (190-210 psi)
4.6L	R	13-82 kPa (2-12 psi)	441-683 kPa (64 -99 psi)	572-655 kPa (83 -95 psi)	1427 -1855 kPa (207-269 psi)
3.8L	P, N, OD, 2, 1	138-207 kPa (20-30 psi)	448-586 kPa (65 -85 psi)	689-758 kPa (100-110 psi)	1310 -1448 kPa (190-210 psi)
3.8L	R	103-172 kPa (15-25 psi)	448-620 kPa (65 -90 psi)	572-662 kPa (83 -96 psi)	1427 -1862 kPa (207-270 psi)

Place the ignition switch in the OFF position. If line pressure is not within specification, check EPC pressure.
Connect pressure gauge to EPC pressure tap.
Start engine and check EPC pressure. Use the line pressure chart for specifications.
If EPC pressure is not within specification, Go To PINPOINT TEST E: OUTPUT SHAFT SPEED (OSS) SENSORS to diagnose EPC operation. If EPC operation is OK, see the LINE PRESSURE DIAGNOSIS CHART for line pressure concern causes.