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Code 31 - Throttle Position (TP) Sensor

NOTE: For ECM harness connector terminal identification, see Figure.
  1. Turn ignition off. Disconnect TP sensor harness connector. Using an ohmmeter, check resistance between TP sensor terminals No. 1 (Red wire) and No. 3 (Black wire). Resistance should be 5000 ohms. Check resistance between TP sensor terminals No. 2 (White wire) and No. 3 (Black wire), while slowly opening throttle valve from closed position.
  2. Resistance should be 10,000-12,000 ohms at fully closed throttle and 3000-5000 ohms at fully open throttle. Resistance should increase in response to throttle valve opening. If resistance is as specified, go to next step. If resistance is not as specified, replace throttle position sensor.
  3. Disconnect ECM harness connectors. Using an ohmmeter, check resistance between ECM harness connector terminal B1 and TP sensor harness connector terminal No. 3 (Black wire), between ECM harness connector terminal B2 and sensor harness connector terminal No. 1 (Red wire), and between ECM harness connector terminal B3 and TP sensor harness connector terminal No. 2 (White wire). Resistance should be zero ohms.
  4. Check resistance between ground and harness connector terminals B1, B2 and B3. Resistance should be one megohm or greater 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.
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