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Code 33 - Vehicle Speed Sensor No. 2

NOTE: For ECM harness connector terminal identification, see Figure.
  1. Raise and support vehicle. Start engine and rotate wheels to check speedometer operation. If speedometer does not operate, go to next step. If speedometer operates, use a DVOM to check voltage between ECM harness connector terminal A3 (backprobe) and ground. Voltage should toggle between zero and 5 volts. If voltage toggles as specified, go to next step. If voltage does not toggle as specified, go to step 5).
  2. Turn ignition off. Disconnect ECM harness connectors. Turn ignition on. Using a DVOM, check voltage between ground and ECM harness connector terminals A2 and A13.
  3. Voltage should be 10 volts or greater at each terminal. If voltage is not as specified, repair appropriate circuit as necessary. If voltage is as specified, go to next step.
  4. Turn ignition off. Using an ohmmeter, check resistance between ground and ECM harness connector terminals A11 and A22. Resistance should be zero ohms at each terminal. If resistance is not as specified, repair appropriate circuit as necessary. If resistance is as specified, check ECM harness connector terminals for good contact. Repair as necessary. If harness connector terminals are okay, replace ECM.
  5. Turn ignition off. Disconnect speed sensor harness connector. Using an ohmmeter, check resistance between ECM harness connector terminal B11 and speed sensor harness connector terminal No. 1 (Yellow/Red wire). Resistance should be zero ohms. If resistance is as specified, go to next step. If resistance is not as specified, repair circuit as necessary.
  6. Turn ignition on. Using a DVOM, check voltage between speed sensor harness connector terminal No. 1 (Yellow/Red wire) and ground. Voltage should be 10 volts or greater. If voltage is as specified, go to next step. If voltage is not as specified, go to step 8).
  7. Using a DVOM, check voltage between main relay harness connector terminal No. 3 (White/Red wire) and ground. Voltage should be 10 volts or greater. If voltage is as specified, replace main relay. If voltage is not as specified, repair circuit as necessary.
  8. Remove speed sensor. Connect sensor harness connector to speed sensor. Connect DVOM between speed sensor harness connector terminals No. 1 (Yellow/Red wire) and No. 3 (Green/Yellow wire). While rotating speed sensor shaft, ensure voltage switches from zero to 5 volts, 4 times per revolution. If voltage changes as described, speed sensor is okay. Malfunction is mechanical. If voltage does not change as described, replace speed sensor.
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