Line Pressure Test
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Line pressure tap |
| 2 | - | Transmission fluid drain plug |
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 the Stall Speed Test or further transaxle damage will occur. Do not maintain wide open throttle (WOT) in any transaxle range for more than 5 seconds.
CAUTION:
Do not mistake the transmission fluid drain plug for the line pressure tap plug or the transmission fluid will have to be refilled.
This test verifies that the line pressure is within specification.
- Connect a pressure gauge to the line pressure tap.
- Start the engine and check the line pressures see the line pressure chart to determine if the line pressure is within specification.LINE PRESSURE CHART
Gear Line Pressures at Idle a P 372-413 kPa (54-60 psi) R 689-724 kPa (100-105 psi) N 372-413 kPa (54-60 psi) D 579-600 kPa (84-87 psi) L 579-600 kPa (84-87 psi) Pressure at Wide Open Throttle (WOT) Stall a P 372-413 kPa (54-60 psi) R 1,724-2,068 kPa
(250-300 psi)N 372-413 kPa (54-60 psi) D 1,655-1,724 kPa
(240-250 psi)L 1,655-1,724 kPa
(240-250 psi)a All pressures are approximate.
- If the line pressure is not within specification, go to Pinpoint Test A to diagnose the LPC operation. If LPC operation is OK, see the Line Pressure Diagnosis Chart for line pressure concern causes.
LINE PRESSURE DIAGNOSIS CHART
| Test Results | Possible Source |
|---|---|
| HIGH at IDLE - ALL RANGES | Wiring Harnesses LPC Solenoid Main Regulator Valve |
| LOW at IDLE - ALL RANGES | Low Fluid Level Fluid Inlet Filter/Seal Main Control Body Cross Leaks Gaskets Pump Separator Plate |
| LOW in Park ONLY | Valve Body |
| LOW in Reverse ONLY | Separator Plate Reverse Clutch Valve Body Forward Clutch |
| LOW in Neutral ONLY | Valve Body |
| LOW in Overdrive ONLY | Forward Clutch Valve Body |
| LOW in Drive ONLY | Forward Clutch |
| LOW in Manual 1st ONLY | Forward Clutch Valve Body |