Line Pressure Test
Line Pressure TestCAUTION: The Transmission Tester must be removed and the vehicle harness installed when verifying these pressures.
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 (5) seconds.
NOTE: Certain sensor failures may cause high EDC, 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 0-2758 kPa (0-400 psi) pressure gauge to the line pressure tap.
2. Start engine and check line pressures. Refer to the following Line Pressure Specifications No. 401 chart to determine if line pressure is within specifications. Pressure Chart - 401
CAUTION: Do not install Transmission Tester when verifying these pressures.
Line Pressure Specifications Chart:
NOTE: Vehicle harness must be installed at transmission connector to verify these pressures.
3. If line pressure is not within specifications, perform On-Board Diagnostics, Pinpoint Test E. Perform Air Pressure Test and service main control or pump assembly as required.
Description of On-Board Diagnostics
E: Electronic Pressure Control (EPC) Solenoid
Air Pressure Tests
4. If line pressure is not within specifications after mechanical checks and there are no DTCs, electronic pressure control (EPC) solenoid may be mechanically malfunctioning. Refer to the Line Pressure Diagnosis Chart for symptom diagnosis.
Line Pressure Diagnosis Chart:
