Line Pressure Test

This test verifies that the line pressure is within specification.

1. Connect pressure gauge to line pressure tap.
2. 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)

3. Place the ignition switch in the OFF position. If line pressure is not within specification, check EPC pressure.
4. Connect pressure gauge to EPC pressure tap.
5. Start engine and check EPC pressure. Use the line pressure chart for specifications.
6. If EPC pressure is not within specification, Go To PINPOINT TEST E: OUTPUT SHAFT SPEED (OSS) SENSORS .
   LINE PRESSURE DIAGNOSIS CHART
   
   

   Test Results	Possible Source
   High At Idle - In All Positions	Wiring Harnesses Run Quick Test. Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE . 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