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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Automatic Transmission - 5ET50 (MKE)) >> Diagnostic Information and Procedures >> Line Pressure Check >> Main Line Pressure Check

Main Line Pressure Check

WARNING: This page is about a different variant/trim than selected.
  1. Install a scan tool.
    Fig 1: Transmission Fluid Pressure Test Hole Plug
    GM4091970Courtesy of GENERAL MOTORS COMPANY
    WARNING: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.
  2. Start the engine.
    NOTE: Depending on the hybrid/EV battery state of charge the engine may not start. To start or keep the engine running open the hood.
  3. If the engine will not start, refer to Engine Will Not Crank - Crankshaft Will Not Rotate .
  4. Inspect the transmission for the proper fluid level. Refer to Transmission Fluid Level and Condition Check .
  5. Inspect the manual linkage at the transmission for proper function.
  6. Turn the engine OFF.
  7. Remove the line pressure test hole plug.
    NOTE: You may need to remove or disconnect components in order to gain access to the transmission line pressure test hole plug.
  8. Install the EN 21867 - A  pressure gauge.
  9. Access the Scan Tool Transmission Output Controls for the Line Pressure Control Solenoid.
  10. Start the engine.
  11. Use the scan tool to increase and decrease the Line Pressure Control Solenoid in increments of approximately 100 KPa (15 psi). The scan tool commands the increment values automatically.
    NOTE:

    In order to achieve accurate line pressure readings, the following procedure must be performed at least 3 times in order to gather uniform pressure readings. Also if you do not have the hood open the engine may go in to AutoStop.

    The scan tool is only able to control the line Pressure Control solenoid in PARK and NEUTRAL with engine speeds below 1500 RPM. This protects the clutches from extreme high or low line pressures.

  12. Allow the pressure to stabilize between increments.
  13. Compare your pressure readings on the scan tool to those indicated on the EN 21867 - A  pressure gauge.
  14. If the pressure readings vary greatly, refer to Automatic Transmission Fluid Pump Pressure High or Low 
  15. Install the pressure test hole plug. Tighten the pressure plug to 11 N.m (97 lb in).
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