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Code 14: Throttle Position Sensor

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.
  1. If using scan tester, go to step 3). Disconnect Throttle Position Sensor (TPS) connector. Using DVOM, check resistance between TPS terminals No. 1 and No. 4. If resistance is not 3500-6500 ohms, replace TPS. If resistance is as specified, go to next step.
  2. Check resistance between TPS terminals No. 2 & 4. While monitoring DVOM, slowly open throttle from idle to fully open position. If resistance does not change smoothly, replace TPS. If resistance changes smoothly, go to step 4).
  3. Turn ignition switch to ON position. Using scan tester, read Throttle Position Sensor (TPS) voltage. With throttle at idle, voltage should read .3-1.0 volt. Voltage should increase while slowly opening throttle. At wide open throttle, voltage should read 4.5-5.5 volts. If voltage is not as specified, replace TPS. If voltage is as specified, go to next step.
  4. Disconnect TPS connector. Using DVOM, check continuity between chassis ground and terminal No. 4. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  5. Disconnect TPS connector and ECM connector. Check for continuity between specified TPS connector terminal and ECM connector terminal. See TPS-TO-ECM WIRING HARNESS TERMINAL IDENTIFICATION  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
    TPS-TO-ECM WIRING HARNESS TERMINAL IDENTIFICATION

    Application TPS Terminal No. ECM Terminal No.
    All Models 1 61
    2 64
  6. Check voltage between chassis ground and TPS connector terminal No. 1. If voltage is not 4.8-5.2 volts, replace ECM. If voltage is as specified, condition required to set trouble code is not present at this time. Test is complete. Intermittent problem may exist. See TESTS W/O CODES article in the ENGINE PERFORMANCE Section.
  7. Disconnect TPS connector. Turn ignition switch to ON position. Using DVOM, check voltage between chassis ground and specified TPS connector terminal. Refer to the TPS-TO-ECM WIRING HARNESS TERMINAL IDENTIFICATION  table. If voltage is not 4.8-5.2 volts, repair wiring harness as necessary. If voltage is as specified, go to next step.
  8. Check continuity between chassis ground and TPS connector terminal No. 4. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  9. With TPS connector and ECM connector disconnected, check for continuity between TPS connector terminal No. 2 and ECM connector terminal No. 9. If continuity does not exist, repair wiring harness as necessary. If continuity exists, condition required to set trouble code is not present at this time. Test is complete. Intermittent problem may exist. See TESTS W/O CODES article in the ENGINE PERFORMANCE Section.
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