Home ReviewsRefund
Home/Acura/RL/Acura RL II facelift (2008-2012)/Repair manual/Testing & Diagnostics/DTC P0123: TP Sensor A Circuit High Voltage
Contents Wiring diagrams Section: Testing & Diagnostics All sections

DTC P0123: TP Sensor A Circuit High Voltage Acura RL II facelift

Testing & Diagnostics 7 illustrations ~699 words

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 251

Scheme 251: DTC P0123: TP Sensor A Circuit High Voltage
Scheme 251: DTC P0123: TP Sensor A Circuit High Voltage

Scheme 252

Scheme 252
Scheme 252

Scheme 253

Scheme 253
Scheme 253

Scheme 254

Scheme 254
Scheme 254

Scheme 255

Scheme 255
Scheme 255

Scheme 256

Scheme 256
Scheme 256

Scheme 257

Scheme 257
Scheme 257
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Check TP SENSOR A in the DATA LIST with the HDS. Is there about 4.8 V or more? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the throttle actuator control module.
  4. Check for Temporary DTCs or DTCs with the HDS. Are DTC P0123 and P0223 indicated at the same time? YES -Go to step 13 . NO -Go to step 5.
  5. Measure the voltage between throttle body 6P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 20 . NO -Go to step 8 .
  6. Turn the ignition switch to LOCK (0).
  7. Disconnect the throttle body 6P connector.
  8. Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
  9. Connect throttle body 6P connector terminal No. 1 to body ground with a jumper wire.
  10. Check for continuity between C251 connector (13P) terminal No. 4 and body ground. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the throttle body and the C251 connector (TPSA line), then go to step 22 .
  11. Disconnect the throttle actuator control module 16P connector (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(ref-348542-S00967459722009112400000) ).
  12. Check for continuity between throttle actuator control module 16P connector terminal No. 10 and C251 connector (13P) terminal No. 4. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the throttle actuator control module and the C251 connector (TPSA line), then go to step 22 .
  13. Turn the ignition switch to LOCK (0).
  14. Disconnect the throttle body 6P connector.
  15. Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
  16. Connect throttle body 6P connector terminal No. 4 to body ground with a jumper wire.
  17. Check for continuity between C251 connector (13P) terminal No. 5 and body ground. Is there continuity? YES -Go to step 18. NO -Repair open in the wire between the throttle body and the C251 connector (SG line), then go to step 22 .
  18. Disconnect the throttle actuator control module 16P connector (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(ref-348542-S00967459722009112400000) ).
  19. Check for continuity between throttle actuator control module 16P connector terminal No. 9 and C251 connector (13P) terminal No. 5. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the throttle actuator control module (SG line) and the C251 connector, then go to step 22 .
  20. Turn the ignition switch to LOCK (0).
  21. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(ref-348519-S01599103842009112400000) ).
  22. Reconnect all connectors.
  23. Turn the ignition switch to ON (II).
  24. Reset the PCM with the HDS.
  25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-348529-S13364648212009112400000) ).
  26. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0123 indicated? YES -Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
  27. Reconnect all connectors.
  28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-348508-S21120732372009112400000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-348507-S19166854742009112400000) ).
  29. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0123 indicated? YES -Check for poor connections or loose terminals at the throttle body and the throttle actuator control module. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-348507-S19166854742009112400000) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(ref-348508-S08692035992009112400000) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

More articles — Electronic Throttle Control System