Line Pressure Test
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 wide open throttle (WOT) in any transmission range for more than 5 seconds.
This test verifies that the line pressure is within specification.
- Connect a pressure gauge to the line pressure tap.
- Start the engine and check line pressures. Refer to the LINE PRESSURE TABLE to determine if line pressure is within specification.LINE PRESSURE TABLE
Applications Range Idle WOT EPC Line Pressure EPC Line Pressure All P, N 34-276 kPa (5-40 psi) 276-689 kPa (40-100 psi) N/A N/A OD, 2, 1 34-276 kPa (5-40 psi) 276-689 kPa (40-100 psi) 689-793 kPa (100-115 psi) 1,172-1,586 kPa (170-230 psi) R 172-207 kPa (25-30 psi) 689-862 kPa (100-125 psi) 586-655 kPa (85-95 psi) 1,124-2,068 kPa (250-300 psi) - Place the ignition switch in the OFF position. If line pressure is not within specification, check EPC pressure.
- Connect a pressure gauge to the EPC pressure tap.
- Start the engine and check EPC pressure. Use LINE PRESSURE DIAGNOSIS TABLE for specifications.
- If the EPC pressure is not within specification, GO to PINPOINT TEST D to diagnose the EPC operation. If the EPC operation is OK, refer to the LINE PRESSURE DIAGNOSIS TABLE for line pressure concern causes.
LINE PRESSURE DIAGNOSIS TABLE
| Test Results | Possible Source |
|---|---|
| High at Idle in All Positions |
|
| Low at Idle in All Positions |
|
| Low in Park Only |
|
| Low in Reverse Only |
|
| Low in Neutral Only |
|
| Low in Overdrive Only |
|
| Low in 1st Position |
|
| Low in 2nd Position |
|