DTC P0122: TP Sensor A Circuit Low Voltage Acura RL II facelift

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

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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 0.3 V or less? 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 P0122 and P0222 indicated at the same time? YES -Check for, and repair any poor connections or loose terminals at the throttle body, the throttle actuator control module, and the PCM, then go to step 21 . If the connections and terminals are OK, go to step 11. NO -Go to step 5.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the throttle body 6P connector.
7. Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
8. Check for continuity between throttle body 6P connector terminal No. 1 and body ground. Is there continuity? YES -Repair short in the wire between the throttle body and the C251 connector (TPSA line), then go to step 21 . NO -Go to step 9.
9. Disconnect the throttle actuator control module 16P connector.
10. Check for continuity between C251 connector (13P) terminal No. 4 and body ground. Is there continuity? YES -Repair short in the wire between the throttle actuator control module and the C251 connector (TPSA line), then go to step 21 . NO -Go to step 26 .
11. Measure the voltage between throttle body 6P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to step 19 . NO -Go to step 12.
12. Turn the ignition switch to LOCK (0).
13. Disconnect the throttle body 6P connector.
14. Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
15. Connect throttle body 6P connector terminal No. 2 to body ground with a jumper wire.
16. Check for continuity between C251 connector (13P) terminal No. 3 and body ground. Is there continuity? YES -Go to step 17. NO -Repair open in the wire between the throttle body and the throttle actuator control module (VCC line), then go to step 21 .
17. Disconnect the throttle actuator control module 16P connector (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(ref-348542-S00967459722009112400000) ).
18. Check for continuity between throttle actuator control module 16P connector terminal No. 11 and C251 connector (13P) terminal No. 3. Is there continuity? YES -Go to step 26 . NO -Repair open in the wire between the throttle actuator control module (VCC line) and the C251 connector, then go to step 21 .
19. Turn the ignition switch to LOCK (0).
20. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(ref-348519-S01599103842009112400000) ).
21. Reconnect all connectors.
22. Turn the ignition switch to ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-348529-S13364648212009112400000) ).
25. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0122 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.
26. Reconnect all connectors.
27. 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) ).
28. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0122 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.