Line Pressure Test
Line Pressure TestCAUTION: Carry out Line Pressure Test prior to carrying out Stall Speed Test. If line pressure is low at stall, do not carry out the Stall Speed Test or further transmission damage will occur. Do not maintain wide open throttle (WOT) in any gear range for more than 5 seconds.
NOTE: Certain sensor failures may cause high PC, FMEM (failure mode effect management) actions. Be sure that self-test and electrical repairs have been carried out or test results may be incorrect.
NOTE: The line pressure tap is used to verify output pressure from PC A or PC B by turning either one off, while verifying the output from the other solenoid. The second pressure tap is used to verify the output from the PCC solenoid.
This test verifies that the line pressure is within specification.
1. Connect the pressure gauge to the line pressure tap.
2. Start the engine and check line pressures. Refer to the Line Pressure Chart to determine if line pressure is within specifications.
Line Pressure Chart - 4.0L and 4.6L Engines:
3. If the line pressure is not within specification, check the PCC pressure.
4. Connect the pressure gauge to the PCC pressure tap.
5. Start the engine and check the PCC pressure. Refer to Line Pressure Diagnosis Chart for specification.
6. If the PCC pressure is not within specification, GO to Pinpoint Test D to diagnose PCC operation. If PCC operation is OK, refer to Line Pressure Diagnosis Chart for line pressure concern causes. Test D: Pressure Control (PC) Solenoids (PCA, PCB, PCC)
Line Pressure Diagnosis Chart (Part 1):
Line Pressure Diagnosis Chart (Part 2):
