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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Automatic Transmission - 6T40 (MH8 MHB) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P1876: Up and Down Shift Enable Switch >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    You must perform Circuit/System Verification first.

  1. Ignition OFF, disconnect the harness connector at the S3 Transmission Shift Lever.
  2. Test for less than 10 Ω between the vehicle harness connector terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the vehicle harness at the ground connection.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Test for 11-13 V at the vehicle harness connector between signal circuit terminal 3 and ground.
    • If not between 11-13 V 
    1. Ignition OFF, disconnect the connector at the BCM.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance.
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the BCM.
    • If between 11-13 V 
  5. Ignition OFF, connect the harness connector at the S3 Transmission Shift Lever.
  6. Test for voltage between the S3 Transmission Shift Lever connector signal circuit terminal 3 and ground, by back probing the connector, for the conditions listed below.
    • 2.0-4.6 V - Plus button pressed
    • 5.1-7.3 V - Minus button pressed
    • 8.0-10.6 V - Neither button pressed
    • If voltage values are not correct 

      Replace the S3 Transmission Shift Lever.

    • If voltage values are correct 
  7. Replace the K9 Body Control Module.
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