Line Pressure Test
LINE PRESSURE TEST^ TOOLS REQUIRED
- J 45195 VT-25E Line Pressure Gauge
CAUTION: KEEP BRAKES APPLIED AT ALL TIMES IN ORDER TO PREVENT UNEXPECTED VEHICLE MOTION.
NOTICE: Total test running time should be longer than two minutes. Otherwise, transaxle damage could occur.
IMPORTANT: The Scan tool is only able to control the line pressure control solenoid in Park with the vehicle stopped. This protects the transaxle Clutches from extremely high or low pressure in Drive or Reverse.
1. Hook Lip Scan tool.
2. Start engine and set parking brake.
3. Check for stored diagnostic trouble codes, including diagnostic codes for the line pressure control solenoid.
4. Repair vehicle if necessary. Include the following area:
^ Inspect fluid level.
^ Inspect manual linkage at transaxle
IMPORTANT: Permatex High Temperature Thread sealant (P/N 2145278) or equivalent must be applied to the threaded components of the line pressure gauge to ensure that no leakage occurs during testing.
5. Remove the line pressure tap plug and install VT-25E Line Pressure Gauge J45195 (or equivalent) to the transaxle.
6. Make sure that the gear selector is in Park and the parking brake is set.
7. Start the engine and allow the engine to warm up at idle.
8. Access the Line PC Solenoid Control on the Scan tool.
9. With the engine speed at idle, increase/decrease the line PC solenoid amperage to 1.0 amps. Read and record the corresponding line pressure on the pressure gauge.
IMPORTANT: Maximum line pressure developed by the pump is affected by engine speed, in order to develop the pressure for the high pressure test point the engine speed must be between 1000 and 1500 rpm. A line pressure reading taken at a lower engine speed will be low and may lead to misdiagnosis.
10. Increase the engine speed to be between 1000-1500 rpm before recording performing the next test point.
11. decrease the Line PC solenoid amperage in to 0.2 amps. Read and record the corresponding line pressure on the pressure gauge. Compare the collected readings to the following chart.
IMPORTANT: Before reinstalling the line pressure tap plug, apply Permatex Medium Grade Threadlocker Blue or equivalent to the thread of the plug.
12. Remove the J45195 VT-25E Line Pressure Gauge and install the line pressure tap plug.