Line Pressure Tests

Line Pressure Test

Caution: Perform Line Pressure Test prior to performing Stall Speed Test. If line pressure is low at stall, do not perform Stall Speed Test or further transmission damage will occur. Do not maintain wide open throttle in any gear range for more than five seconds.

Note: Certain sensor failures may cause high EPC, FMEM (Failure Mode Effect Management) actions. Be sure that Self Test and electrical repairs have been performed, or test results may be incorrect.

This test verifies that the line pressure is within specifications.





1. Connect pressure gauge to the line pressure tap.
2. Start engine and check line pressures. Refer to the following Pressure chart to determine if line pressure is within specifications.
^ If line pressure is not within specifications, check EPC pressure.









3. Connect Pressure Gauge to EPC pressure tap.
4. Restart engine and check EPC pressure. Refer to Reference pressure chart for specification.
^ If EPC pressure is not within specification, see DTC P1746, P1747: ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID 5R44E AND 5R55E ONLY, to diagnose EPC.
^ If EPC operation is OK, refer to line pressure diagnosis chart for line pressure concern causes.