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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T30 (MH9) Or 6T40 (MH8) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0815, P0816 or P0826: Upshift/Downshift Switch Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector from the S3 Transmission Shift Lever.
    NOTE: You must perform Circuit/System Verification  first.
  2. Test for less than 10 Ω between the vehicle harness connector ground circuit terminal 2 and ground.
    • If 10 Ω or greater 

      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, ignition ON.
  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 - Shift lever left of D, pressed forward
    • 5.1-7.3 V - Shift lever left of D, pressed rearward
    • 8.0-10.6 V - Shift lever left of D
    • 11-13 V - Shift lever in D
    • 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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