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DTC P0122 - Throttle Position (TP) Sensor

  1. Turn ignition on. Using scan tool, check TP sensor. If reading is approximately 10% with throttle fully closed and 90% with throttle fully opened, problem is intermittent. System is okay at this time. Check for poor connections or loose wires in TP circuits between TP sensor connector and PCM connector. See WIRING DIAGRAMS  section.
  2. If reading is not approximately 10% with throttle fully closed and 90% with throttle fully opened, turn ignition off. Disconnect TP sensor connector. Turn ignition on. Measure voltage between TP sensor harness connector terminals No. 1 (SG2) and 3 (VCC2). See Fig 1 . If reading is approximately 5 volts, go to step 4).
  3. If reading is not approximately 5 volts, measure voltage between PCM connector terminals D10 and D11. See Figure . If reading is approximately 5 volts, repair open in SG2 circuit between PCM connector TP sensor terminal. See WIRING DIAGRAMS  section. If reading is not approximately 5 volts, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.
  4. Turn ignition off. Measure resistance between TP sensor terminals No. 1 (SG2) and No. 2 (TP) with throttle closed. See Fig 1 . If resistance is not approximately 500 ohms (on Del Sol) or 400-1000 ohms (on Civic), replace TP sensor. If resistance is approximately 500 ohms on Civic Del Sol or 400-1000 ohms on Civic, measure resistance between TP sensor terminals No. 2 (TP) and 3 (VCC2) with throttle fully closed.
  5. If resistance is not approximately 4500 ohms on Civic Del Sol or 3600-5400 ohms on Civic, replace TP sensor. If resistance is approximately 4500 ohms on Civic Del Sol, or 3600-5400 ohms on Civic, reconnect TP sensor and go to next step.
  6. Turn ignition on. Measure voltage between PCM connector terminals D1 and D11. See Figure . If voltage is approximately .5 volt with throttle fully closed and 4.5 volts with throttle fully open, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.
  7. On Civic with D16Y5 engine and CVT, if voltage is not approximately .5 volt with throttle fully closed and 4.5 volts with throttle fully open, go to step 8). On all other models, if voltage is not approximately .5 volt with throttle fully closed and 4.5 volts with throttle fully open, repair short in circuit between PCM connector terminal D1 and TP sensor. See WIRING DIAGRAMS  section.
  8. Turn ignition off. Disconnect TCM connectors. On Civic with CVT, TCM is located behind driver side kick panel. On all models, turn ignition on. Measure voltage between PCM connector terminals D1 and D11. If voltage is approximately .5 volt with throttle fully closed and 4.5 volts with throttle fully open, replace Transmission Control Module (TCM).
  9. If voltage is not approximately .5 volt with throttle fully closed and 4.5 volts with throttle fully open, repair short in circuit between PCM connector terminal D1, TCM connector, and TP sensor connector. See WIRING DIAGRAMS  section.
    Fig 1: TP Sensor Harness Connector Terminals
    G96J09590Courtesy of AMERICAN HONDA MOTOR CO., INC.
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