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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1352 (Automatic Transmission - 2ML70 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> Line Pressure Check >> Auxiliary Fluid Pump >> Pump Check Procedure

Pump Check Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    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 Check .
  4. Use the scan tool to inspect for any active or stored diagnostic trouble codes. If there are any DTC's refer to that DTC table.
  5. Inspect the manual linkage at the transmission for proper function.
  6. Turn the engine OFF.
    7. WARNING: When the transmission is at operating temperatures, take necessary precautions when removing the auxiliary pump pressure test hole plug, to avoid being burned by the catalytic converter.
    NOTE: You may need to remove or disconnect components in order to gain access to the transmission auxiliary pump pressure test hole plug.
  7. Remove the auxiliary pump pressure test hole plug.
  8. Install J 45056:  oil pressure gage adapter fitting prior to connecting the oil pressure gage.
  9. Install the J 21867:  pressure gage.
  10. Access the Scan Tool Hybrid Output Controls for the Aux Trans Pump Speed.
  11. Turn key to the Run Position but do not start the engine.
    12. NOTE: In order to achieve accurate aux pump pressure readings, the following procedure must be performed at least 3 times in order to gather uniform pressure readings.
  12. Use the scan tool to increase and decrease the Aux Pump Speed in increments of approximately 10%. The scan tool commands the increment values automatically starting with 10% going up to 80% and returning down to 30%.
  13. Allow the pressure to stabilize between increments.
  14. Your pressure readings on the J 21867:  pressure gage should slightly increase with each speed command. The J 21867:  pressure gage at 10% should be approximately 40-70 PSI and end up at 80% being approximately 90-120 PSI.
  15. If the pressure readings vary greatly, refer to Auxiliary Fluid Pump Pressure High or Low .
  16. Turn the key OFF.
  17. Disconnect the J 21867:  pressure gage and remove the J 45056:  oil pressure gage adapter fitting.
    18. CAUTION: Refer to Fastener Caution .
  18. Install the auxiliary pump pressure test hole plug. Tighten the pressure plug to 11 N.m (97 lb in).
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