Line Pressure Test
WARNING:
If equipped with fire suppression system, refer to
FIRE SUPPRESSION SYSTEM
for Important Safety Warnings. Failure to follow this instruction may result in serious personal injury.
NOTE:
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 Transmission Fluid Pressure Gauge to line pressure tap.
- Start the 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 34-276 kPa (5-40 psi) 276-689 kPa (40-100 psi) N/A N/A (D), 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) 483-862 kPa (70-125 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 Electronic Pressure Control (EPC) pressure.
- Connect Transmission Fluid Pressure Gauge to the EPC pressure tap.
- Start the 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.
- When the pressure tests are completed, install the pressure tap plugs.
- Tighten to 12 Nm (106 lb-in).LINE PRESSURE DIAGNOSIS CHART
Test Results Possible Source High At Idle - In All Positions - Wiring harnesses
- Run Self Test. Refer to the INTRODUCTION - GASOLINE MODELS
- Electronic Pressure Control (EPC) solenoid
- Main regulator valve
Low At Idle - In All Positions - Low transmission fluid level
- Control bodies
- Transmission fluid 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 (O/D) 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
- Tighten to 12 Nm (106 lb-in).