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Home >> Isuzu >> 2007 >> Ascender 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> Line Pressure Check >> Tools Required >> Line Pressure Check Procedure

Line Pressure Check Procedure

WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
    CAUTION: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly. 
    IMPORTANT: Before performing the line pressure check, verify that the transmission pressure control (PC) solenoid is operating correctly.
  1. Install a scan tool.
  2. Start the engine.
  3. Inspect the transmission for the proper fluid levels. Refer to Transmission Fluid 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. IMPORTANT: It may be necessary to remove or disconnect components in order to gain access to the transmission line pressure test port/plug.
  7. Remove the pressure plug.
  8. Install the J 21867  .
  9. Access the Scan Tool Output Control for the PC Solenoid.
  10. Start the engine.
    11. IMPORTANT: In order to achieve accurate line pressure readings, the following procedure must be performed at least three times in order to gather uniform pressure readings.
    The scan tool is only able to control the PC solenoid in PARK and NEUTRAL with engine speeds below 1500 RPM. This protects the clutches from extreme high or low line pressures.
    This test must be preformed at 1200 RPM, between 38-93°C (100-200°F).
  11. Begin commanding PC Solenoid at 1.0 amp and lower the amperage in one-tenth increments (0.01) until maximum line pressure is achieved.
  12. Allow the pressure to stabilize between increments.
  13. Compare your pressure readings to the Line Pressure table. Refer to Line Pressure .
  14. If the pressure readings vary greatly from the line pressure table, refer to Oil Pressure High or Low .
  15. Turn the engine OFF.
  16. Remove the J 21867  .
    17. NOTE: Refer to Fastener Notice .
  17. Install the pressure plug.

    Tighten:  Tighten the pressure plug to 8-14 N.m (6-10 lb ft).

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