Line Pressure Test
WARNING:
If equipped with fire suppression system, refer to FIRE SUPPRESSION SYSTEM
for Important Safety Warnings.
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 the LINE PRESSURE CHART to determine if line pressure is within specification.LINE PRESSURE CHART
Application Range Idle WOT EPC Line Pressure EPC Line Pressure All P, N 0-138 kPa (0-20 psi) 207-448 kPa (30-65 psi) N/A N/A OD, 2, 1 138-345 kPa (20-50 psi) 345-758 kPa (50-110 psi) 655-793 kPa (95-115 psi) 1,310-1,586 kPa (190-230 psi) R 138-345 kPa (20-50 psi) 552-1034 kPa (80-150 psi) 552-655 kPa (80-95 psi) 1,379-1,931 kPa (200-280 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. Refer to the LINE PRESSURE CHART for specifications.
- If EPC pressure is not within specification, GO to PINPOINT TEST E to diagnose EPC operation. If EPC operation is OK, refer to the LINE PRESSURE DIAGNOSIS CHART for line pressure concern causes.
LINE PRESSURE DIAGNOSIS CHART
| Test Results | Possible Source |
|---|---|
| High At Idle - In All Positions | Wiring Harnesses Run Quick Test. See INTRODUCTION - GASOLINE article . EPC Solenoid Main Regulator Valve |
| Low At Idle - In All Positions | Low Fluid Level Control Bodies Leakage in Pump Damaged Gaskets on Separator Valve Damaged Separator Plate Restricted Inlet Filter Case Bolts Loose Main Control Valve Body EPC Solenoid O-Ring EPC Solenoid Bracket Case Sticking Main Regulator Valve Damaged Inlet Tube Seal on Inlet Filter |
| Low In Park Only | Valve Body Low/Reverse Servo |
| Low In Reverse Only | Separator Plate Low/Reverse Servo or Valve Bodies Reverse Clutch |
| Low In Neutral Only | Valve Body |
| Low In Overdrive Only | Forward Clutch Valve Body |
| Low In 1st Position Only | Forward Clutch Valve Body Low/Reverse Servo |
| Low In 2nd Only | Intermediate Clutch Valve Bodies Forward Clutch |