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DTC P0510/16894 - Closed Throttle Position Switch Malfunction

NOTE: DTC sets if Electronic Control Module (ECM) receives an unusable signal from Closed Throttle Position (CTP) switch.
  1. Inspect TP sensor connector for looseness and/or corrosion. Repair sensor connector as necessary. If sensor connector is okay, go to next step. Erase DTC memory and test drive vehicle. See CLEARING DTCS in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step.
  2. Turn ignition off. Disconnect Throttle Valve Control Module (TVCM) connector. Turn ignition on. Using DVOM, check voltage between TVCM connector terminals No. 4 and 7. Voltage should be about 5 volts. Check voltage between TVCM connector terminals No. 3 and 7. Voltage should be about 10 volts. If voltage is as specified, go to step 6). If voltage is not as specified, go to next step.
  3. Turn ignition off. Disconnect ECM connector. Connect Test Box (VAG 1598/18) to ECM wiring harness. Terminal assignments of test box are identical to ECM connector's.
  4. Check resistance between TVCM connector terminal No. 3 and test box socket No. 10, between TVCM connector terminal No. 4 and test box socket No. 41, and between TVCM connector terminal No. 7 and test box socket No. 33. Resistance should be less than 1.5 ohms. If resistance is as specified, go to step 9). If resistance is not as specified, go to next step.
  5. Check for an open circuit in harness between TVCM and ECM. Repair as necessary. Erase DTC memory and test drive vehicle. See CLEARING DTCS  in this article. If no open circuit is present, replace faulty ECM. Test drive vehicle. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step.
  6. Turn ignition off. Reconnect TVCM connector. With accelerator at Wide Open Throttle (WOT) and at closed throttle, check resistance between test box sockets No. 10 and 33. Resistance should be infinite (no continuity) at WOT and 10 ohms maximum at closed throttle. If resistance is as specified, go to step 9). If resistance is not as specified, go to next step.
  7. With accelerator pedal at closed throttle, check resistance between test box sockets No. 27 and 53. If resistance is 3-200 ohms, go to step 9). If resistance is not as specified, go to next step.
  8. Disconnect TVCM connector. Check resistance between TVCM connector terminal No. 1 and test box socket No. 27, TVCM connector terminal No. 2 and test box socket No. 53, TVCM terminal connector No. 5 and test box socket No. 40, and TVCM connector terminal No. 8 and test box socket No. 62. Resistance should be less than 1.5 ohms. If resistance is not as specified, locate and repair open circuit between TVCM and ECM. Erase DTCs and perform test drive. See CLEARING DTCS in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to step 11). If resistance is as specified, go to next step.
  9. Check resistance between test box sockets No. 10, 27, 33, 40, 41, 53, and 69. Resistance should be infinite (no continuity) between each circuit. If resistance is not as specified, repair circuits shorted to each other. Erase DTCs and perform test drive. See CLEARING DTCS in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to step 11). If no shorts are present, go to next step.
  10. Substitute a known-good TVCM. Erase DTCs and perform test drive. See CLEARING DTCS in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step.
  11. Replace faulty ECM. Test drive vehicle. Recheck DTC memory and verify DTC does not reset. If DTC resets, repeat testing procedure.
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