Chevrolet Trax Owners & Service Manuals

Chevrolet Trax: Line pressure check

Chevrolet Trax (2013-2022) Workshop Manual / Transmission / Automatic Transmission - 6T40 (MH8 MHB) / Diagnostic information and procedures / Line pressure check

Special Tools

GE-21867-A Oil Pressure Gauge Kit

For equivalent regional tools, refer to Special Tools .

Fig. 6: Illustrating Line Pressure Checking
Fig. 6: Illustrating Line Pressure Checking

WARNING: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.

  1. Install a scan tool.
  2. Start the engine.
  3. Inspect the transmission for the proper fluid level. Refer to Transmission Fluid Level and Condition Check.
  4. Use the scan tool to inspect for any active or stored diagnostic trouble codes.
  5. Inspect the manual linkage at the transmission for proper function.
  6. Turn the engine OFF.
  7. Remove the line pressure test hole plug.
  8. Install the GE-21867-A pressure gauge.
  9. Access the Scan Tool Transmission Output Controls for the Line PC Solenoid.
  10. Start the engine.

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.
  • The scan tool is only able to control the line PC solenoid in PARK and NEUTRAL with engine speeds below 1500 RPM. This protects the clutches from extreme high or low line pressures.
  1. Use the scan tool to increase and decrease the Line PC Solenoid in increments of approximately 100 KPa (15 psi). The scan tool commands the increment values automatically.
  2. Allow the pressure to stabilize between increments.
  3. Compare the pressure readings on the scan tool to those indicated on the GE-21867-A pressure gauge.

    Refer to Solenoid Valve Pressure (Gen 2) .

  4. If the pressure readings vary greatly, refer to Fluid Pressure High or Low.
  5. Turn the engine OFF.
  6. Remove the GE-21867-A pressure gauge.

CAUTION: Refer to Fastener Caution .

  1. Install the line pressure test hole plug. Tighten the pressure test hole plug to 12 N.m (106 lb in).

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