LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Automatic Transmission - JATCO CVT) >> Diagnostic Information and Procedures >> DTC P0792: Intermediate Shaft Speed Sensor Circuit Performance - Secondary Pulley Speed Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify fuse F23 is not open, Fuse Block - Underhood.
    • If the fuse is open 

      Test the Ignition 1 voltage circuit and all components connected to the Ignition 1 circuit for a short to ground.

    • If the fuse is not open 
  2. Ignition OFF, disconnect the harness connector at the B14B Transmission Turbine Speed Sensor/Secondary Pulley Speed Sensor.
  3. Test for less than 10 Ω between the low reference circuit terminal 1 and chassis ground or test for less than 50 Ω if between the low reference circuit terminal 1 and the battery ground.
    NOTE:
    • Testing for steps 3 - 6 is performed on the B14B Transmission Turbine Speed Sensor/Secondary Pulley Speed Sensor harness connector using the GY probes J-35616-2A.
    • Chassis ground to battery ground 25 - 35 Ω.
    • If 10 Ω or greater 

      Repair the open/high resistance in the circuit

    • If less than 10 Ω 
  4. Ignition ON. Engine OFF.
  5. Using a fused jumper wire, test for B+ (+0.0/-0.5 V) between the Ignition 1 voltage circuit terminal 3 and the low reference circuit terminal 1.
    • If less than B+ (+0.0/-0.5 V) 

      Repair the open/high resistance in the circuit

    • If B+ (+0.0/-0.5 V) 
  6. Tests for B+ (+0.0/-2.5 V) between the sensor signal circuit terminal 2 and the low reference terminal 1.
    • If less than B+ (+0.0/-2.5 V) 
    1. Ignition OFF, disconnect the X2 harness connector at the K71 Transmission Control Module.
    2. Test for less than 10 Ω in the sensor signal circuit end to end.
      • If 10 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 10 Ω.
    3. Test for infinite resistance between the sensor signal circuit, terminal 1 and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    4. Test for infinite resistance between the sensor signal circuit terminal 2 and all other terminals of the B14B Transmission Turbine Speed Sensor/Secondary Pulley Speed Sensor harness connector.
      • If less than infinite resistance, repair the short together in the affected circuits.
      • If infinite resistance
    5. Connect the red lead of the J-38522  variable signal generator to the sensor signal circuit terminal 2. Connect the black lead of the J-38522  variable signal generator to the low reference circuit terminal 1. Plug the power cord of the J-38522  variable signal generator into the cigar lighter.
    6. Set the J-38522  variable signal generator to 12 volts, the Frequency to 300 and the Duty Cycle to 50%.
    7. Ignition ON. Verify the scan tool Secondary Pulley Speed parameter is between 540 - 660 RPM.
      • If not within the specified range, replace the K71 Transmission Control Module.
      • If within the specified range, test the K71 Transmission Control Module for proper operation. Refer to Component Testing  - K71 Transmission Control Module.
    • If B+ (+0.0/-2.5 V) 
  7. Replace the B14B Transmission Turbine Speed Sensor/Secondary Pulley Speed Sensor.
scientia non olet · About LEMON Manuals