LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2013 >> Sonic RS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Automatic Transmission - 6T30/6T40 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0877 or P0878 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Engine idling in PARK with parking brake applied, and drive wheels chocked.
  2. Verify the Transmission Fluid Pressure Switch 1, Transmission Fluid Pressure Switch 3, Transmission Fluid Pressure Switch 4, and Transmission Fluid Pressure Switch 5 parameters parameter states are correct for the Park, Reverse, and Neutral gear select lever positions. Refer to Transmission Fluid Pressure Switch Logic .
    • If any parameter value is not correct for a given gear range 

      Refer to Circuit/System Testing below.

    • If the parameter values are correct for all gear ranges 
  3. Verify the Transmission Fluid Pressure Switch 1, Transmission Fluid Pressure Switch 3, Transmission Fluid Pressure Switch 4, and Transmission Fluid Pressure Switch 5 parameter states are correct for each forward range with the gear select lever in Drive, using the scan tool to command all forward ranges. Refer to Transmission Fluid Pressure Switch Logic .
    • If any parameter value is not correct for a given gear range 

      Refer to Circuit/System Testing below.

    • If the parameter values are correct for all gear ranges 
  4. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, refer to Testing for Intermittent Conditions and Poor Connections .