Line Pressure Test

5R55S

Line Pressure Test

NOTICE: 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. Stall Speed Test

NOTE: Certain sensor failures may cause high line pressure, Failure Mode Effect Management actions. Be sure that the self test and electrical repairs have been completed or test results may be incorrect.

NOTE: The line pressure tap is used to verify output pressure from Pressure Control Solenoid A (PCA) or Pressure Control Solenoid B (PCB) by turning one solenoid off, while verifying the output from the other solenoid. The second pressure tap is used to verify the output from Pressure Control Solenoid C (PCC).

This test verifies that the line pressure is within specification.

1. Connect the Transmission Fluid Pressure Gauge to the line pressure tap.

2. Start the engine and check line pressures. Refer to the following 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 Transmission Fluid 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 Pinpoint Test D: Pressure Control Solenoids to diagnose PCC operation. If PCC operation is OK, refer to Line Pressure Diagnosis Chart for line pressure concern causes.

7. When pressure tests are complete, install the pressure tap plugs.
- Tighten to 13 Nm (115 lb-in).

Line Pressure Diagnosis Chart: