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Home >> Hyundai >> 1997 >> Tiburon Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0122/P0123: Throttle Position (TP) Sensor Circuit Input
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DTC P0122/P0123: Throttle Position (TP) Sensor Circuit Input

NOTE: This test is associated with DTC P0122 - TP Sensor Circuit Low Input and P0123 - TP Sensor Circuit High Input.
  1. Install scan tool. Start engine and check if DTC P0122 or P0123 is present. If DTC is present, go to next step. If DTC is not present, problem is intermittent. See INTERMITTENTS in TESTS W/O CODES article.
  2. Turn ignition off. Disconnect TP sensor harness connector. Turn ignition on. Connect DVOM between TP sensor harness connector terminal No. 3 and ground. See appropriate wiring diagram in WIRING DIAGRAMS article. Voltage reading should be 4.8-5.2 volts. If voltage is as specified, go to next step. If voltage is not as specified, check circuit between terminal No. 3 and ECM.
  3. Turn ignition off. Check continuity between TP sensor harness connector terminal No. 2 and ground. Continuity should be present. If continuity is present, go to next step. If continuity is not present, check circuit between terminal No. 2 and ECM.
  4. Disconnect ECM harness connector. Connect DVOM between ground and TP sensor harness connector terminal No. 1. Jumper ECM harness connector terminal No. 73 to ground. Continuity should be present. If continuity is not present, check for open in circuit. Remove jumper from ECM harness connector terminal No. 73. Continuity should not be present. If continuity is present, check for short in circuit. If circuit is okay, go to next step.
  5. Reconnect ECM harness connector. Connect DVOM between TP sensor terminals No. 2 and 3. Resistance should be 700-3000 ohms with throttle closed. If resistance is as specified, go to next step. If resistance is not as specified, replace TP sensor.
  6. Connect an analog type ohmmeter between TP sensor terminals No. 1 and 3. Move throttle slowly from idle to wide-open position. Ohmmeter needle should sweep smoothly in proportion to throttle opening. If movement is not smooth, replace TP sensor. If movement is smooth, go to next step.
  7. Reconnect TP sensor harness connector. Clear DTC. See CLEARING CODES under Self Diagnostic System section. Retest system. If DTC resets, replace ECM.
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