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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 P071D: Transmission Sport Mode Switch Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the S112 Fuel Economy Mode Switch.
    NOTE: You must perform Circuit/System Verification  before proceeding with Circuit/System Testing.
  2. Test for less than 10 Ω between the ground circuit terminal 1 of the harness connector 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 ground 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 4.8-5.2 V between the 5 V reference circuit terminal 3 of the harness connector and ground.
    • If less than 4.8 volts 
    1. Ignition OFF, remove the harness connector at the ECM.
    2. Test for infinite resistance between the 5 V reference circuit terminal 3 of the harness connector 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 5 V reference circuit, end to end.
      • If 2 Ω or greater, repair the open/high resistance in the 5 V reference circuit.
      • If less than 2 Ω, replace the K20 engine control module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the ECM, ignition ON.
    2. Test for less than 1 V between 5 V reference circuit terminal 3 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • If between 4.8-5.2 volts 
  5. Verify the scan tool Fuel Economy Mode Switch parameter displays Circuit Low Voltage.
    • If the Fuel Economy Mode Switch parameter does not display Circuit Low Voltage 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the fuel economy signal circuit terminal 4 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • If the Fuel Economy Mode Switch parameter displays Circuit Low Voltage 
  6. Connect a 3 A fused jumper wire between 5 V reference circuit terminal 3 of the harness connector and signal circuit terminal 4 of the harness connector.
  7. Verify the scan tool Fuel Economy Mode Switch parameter displays Circuit High Voltage.
    • If the Fuel Economy Mode Switch parameter does not display Circuit High Voltage 
    1. Ignition OFF, remove the connector at the K20 Engine Control Module.
    2. Test for infinite resistance between signal circuit terminal 4 and ground.
      • If less than infinite resistance, repair the short to ground in the signal circuit.
      • If infinite resistance.
    3. Test for less than 2 Ω in the fuel economy mode signal circuit, end to end.
      • If 2 Ω or greater, repair the open/high resistance in the signal circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If the Fuel Economy Mode Switch parameter displays Circuit High Voltage 
  8. Ignition OFF.
  9. Test for 266-294 Ω between the 5 V reference voltage circuit terminal 3 and the signal circuit terminal 4 on the S112 Fuel Economy Mode Switch.
    • If not between 266-294 Ω 

      Replace the S112 Fuel Economy Mode Switch.

    • If between 266-294 Ω 
  10. Test for 927-1024 Ω between signal circuit terminal 4 and low reference circuit terminal 1 on the S112 Fuel Economy Mode Switch.
    • If not between 927-1024 Ω 

      Replace the S112 Fuel Economy Mode Switch.

    • If between 927-1024 Ω 
  11. Test for 220-244 Ω between terminal 4 and terminal 1 on the S112 Fuel Economy Mode Switch, with the switch pressed.
    • If not between 220-244 Ω 

      Replace the S112 Fuel Economy Mode Switch.

    • If between 220-244 Ω 
  12. Replace the K20 Engine Control Module.
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