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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 P0721: Output Speed Sensor Performance >> Component Testing >> K71 Transmission Control Module

K71 Transmission Control Module

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. Ignition OFF, disconnect the harness connector at the B14A Output Shaft Speed Sensor.
  2. 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.
    NOTE: Testing for steps 2 - 4 is performed on the B14A Output Shaft Speed Sensor harness connector using the GY probes J-35616-2A  .
  3. Set the J-38522  variable signal generator to 12 volts, the Frequency to 30 and the Duty Cycle to 50%.
  4. Ignition ON. Verify the scan tool Transmission OSS parameter is between the following specified ranges as you rotate the frequency switch through the various selections.
    • If not within the specified range, replace the K71 Transmission Control Module.
    • If within the specified range.
  5. K71 Transmission Control Module OK.
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