Home ReviewsRefund
Home/Acura/ZDX/Acura ZDX I (2009-2013)/Repair manual/Mechanical/Vtec
Contents Wiring diagrams Section: Mechanical All sections

Vtec Acura ZDX I

Mechanical 12 illustrations ~2931 words

Scheme 352

Scheme 352: Component Location Index
Scheme 352: Component Location Index

DTC P2646: Rocker Arm Oil Pressure Switch Circuit Low Voltage

Special Tools Required

  1. Pressure Gauge Adapter 07NAJ-P07010A
  2. A/T Low Pressure Gauge w/Panel 07406-0070301
  3. A/T Pressure Test Hose 07AAJ-PY4A100
  4. A/T Pressure Adapter 07MAJ-PY40120
  5. Oil Pressure Hose 07ZAJ-S5AA200

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

Scheme 353

Scheme 353
Scheme 353

Scheme 354

Scheme 354
Scheme 354
  1. Check the engine oil level. Is the engine oil level OK? YES -Go to step 2. NO -Adjust the engine oil to the proper level, then go to step 19 .
  2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  3. Clear the DTC with the HDS.
  4. Do the VTEC TEST in the INSPECTION MENU with the HDS. Is the result OK? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the PCM. NO -Go to step 5.
  5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  6. Disconnect the rocker arm oil pressure switch 2P connector.
  7. Turn the ignition switch to ON (fl), or press the engine start/stop button to select the ON mode.
  8. Check the VTEC PRES SW in the DATA LIST with the HDS. Is switch ON indicated? YES -Go to step 14 . NO -Go to step 9.
  9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  10. Remove the rocker arm oil pressure switch (A), attach the special tools as shown in the illustration, then attach the rocker arm oil pressure switch to the oil pressure gauge adapter (B).
  11. Start the engine.
  12. Do the VTEC TEST in the INSPECTION MENU with the HDS.
  13. Check the oil pressure. Does the oil pressure increase to at least 392 kPa (4.0 kgf/cm 2 , 56.9 psi)? YES -Replace the rocker arm oil pressure switch (see «ROCKER ARM OIL CONTROL SOLENOID REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) ), then go to step 18 . NO -Inspect the VTEC system. If it is OK, replace the rocker arm oil control solenoid (see «ROCKER ARM OIL CONTROL SOLENOID REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) ), then go to step 18 .
  14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  15. Jump the SCS line with the HDS.
  16. Disconnect PCM connector B (49P).
  17. Check for continuity between PCM connector terminal B20 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B20) and the rocker arm oil pressure switch, then go to step 18. NO -Go to step 24 .
  18. Reconnect all connectors.
  19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  20. Reset the PCM with the HDS.
  21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
  22. Do the VTEC TEST in the INSPECTION MENU with the HDS.
  23. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2646 indicated? YES -Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) .
  24. Reconnect all connectors.
  25. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
  26. Do the VTEC TEST in the INSPECTION MENU with the HDS.
  27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2646 indicated? YES -Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 26 . 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»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) .

DTC P2647: Rocker Arm Oil Pressure Switch Circuit High Voltage

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

Scheme 355

Scheme 355: DTC P2647: Rocker Arm Oil Pressure Switch Circuit High Voltage
Scheme 355: DTC P2647: Rocker Arm Oil Pressure Switch Circuit High Voltage

Scheme 356

Scheme 356
Scheme 356

Scheme 357

Scheme 357
Scheme 357
  1. Check the engine oil level. Is the engine oil level OK? YES -Go to step 2. NO -Adjust the engine oil level, then go to step 17 .
  2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  3. Clear the DTC with the HDS.
  4. Check the rocker arm oil pressure switch in the DATA LIST with the HDS. Does the HDS indicate OFF? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the PCM.
  5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  6. Disconnect the rocker arm oil pressure switch 2P connector.
  7. Connect rocker arm oil pressure switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
  8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  9. Check the rocker arm oil pressure switch in the DATA LIST with the HDS. Does the HDS indicate ON? YES -Replace the rocker arm oil pressure switch (see «ROCKER ARM OIL CONTROL SOLENOID REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) ), then go to step 16 . NO -Go to step 10.
  10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  11. Remove the jumper wire from the rocker arm oil pressure switch.
  12. Jump the SCS line with the HDS.
  13. Disconnect PCM connector B (49P).
  14. Check for continuity between PCM connector terminal B20 and rocker arm oil pressure switch 2P connector terminal No. 1. Is there continuity? YES -Go to step 15. NO -Repair an open in the wire between the PCM (B20) and the rocker arm oil pressure switch, then go to step 16 .
  15. Check for continuity between the rocker arm oil pressure switch 2P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 22 . NO -Repair an open in the wire between the rocker arm oil pressure switch and G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 16.
  16. Reconnect all connectors.
  17. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  18. Reset the PCM with the HDS.
  19. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
  20. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2647 indicated? YES -Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the PCM, then go to step 1 . NO -Go to step 21.
  21. Monitor the OBD STATUS for DTC P2647 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 20 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
  22. Reconnect all connectors.
  23. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
  24. Start the engine, and let it idle.
  25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2647 indicated? YES -Check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 24 . If the PCM was substituted, go to step 1 . NO -Go to step 26.
  26. Monitor the OBD STATUS for DTC P2647 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the rocker arm oil pressure switch, the rocker arm oil control solenoid, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 24 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2648: Rocker Arm Oil Control Solenoid Circuit Low Voltage

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

Scheme 358

Scheme 358: DTC P2648: Rocker Arm Oil Control Solenoid Circuit Low Voltage
Scheme 358: DTC P2648: Rocker Arm Oil Control Solenoid Circuit Low Voltage

Scheme 359

Scheme 359
Scheme 359
  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Clear the DTC with the HDS.
  3. Do the VTEC TEST in the INSPECTION MENU with the HDS. Is the result OK? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM. NO -Go to step 4.
  4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  5. Disconnect the rocker arm oil control solenoid 1P connector.
  6. At the solenoid side, measure the resistance between the rocker arm oil control solenoid 1P connector terminal and the solenoid valve body. Is there 14-30 ohms at room temperature? YES -Go to step 7. NO -Go to step 10 .
  7. Jump the SCS line with the HDS.
  8. Disconnect PCM connector B (49P).
  9. Check for continuity between PCM connector terminal B39 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B39) and the rocker arm oil control solenoid, then go to step 11 . NO -Go to step 18 .
  10. Replace the rocker arm oil control solenoid (see «ROCKER ARM OIL CONTROL SOLENOID REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) ).
  11. Reconnect all connectors.
  12. Turn the ignition switch ON (II), or press the engine start/stop button to select the ON mode.
  13. Reset the PCM with the HDS.
  14. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
  15. Do the VTEC TEST in the INSPECTION MENU with the HDS.
  16. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2648 indicated? YES -Check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM, then go to step 1 . NO -Go to step 17.
  17. Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 16 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 15 .
  18. Reconnect all connectors.
  19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
  20. Do the VTEC TEST in the INSPECTION MENU with the HDS.
  21. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2648 indicated? YES -Check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . NO -Go to step 22.
  22. Monitor the OBD STATUS for DTC P2648 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 21 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, go to step 20 .

DTC P2649: Rocker Arm Oil Control Solenoid Circuit High Voltage

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

Scheme 360

Scheme 360: DTC P2649: Rocker Arm Oil Control Solenoid Circuit High Voltage
Scheme 360: DTC P2649: Rocker Arm Oil Control Solenoid Circuit High Voltage

Scheme 361

Scheme 361
Scheme 361
  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
  4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2649 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM.
  5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  6. Disconnect the rocker arm oil control solenoid 1P connector.
  7. At the solenoid side, measure the resistance between the rocker arm oil control solenoid 1P connector terminal and the solenoid valve body. Is there 14-30 ohms at room temperature? YES -Go to step 8. NO -Go to step 11 .
  8. Jump the SCS line with the HDS.
  9. Disconnect PCM connector B (49P).
  10. Check for continuity between PCM connector terminal B39 and the rocker arm oil control solenoid IP connector terminal. Is there continuity? YES -Go to step 18 . NO -Repair an open in the wire between the PCM (B39) and the rocker arm oil control solenoid, then go to step 12 .
  11. Replace the rocker arm oil control solenoid (see «ROCKER ARM OIL CONTROL SOLENOID REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) ).
  12. Reconnect all connectors.
  13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  14. Reset the PCM with the HDS.
  15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
  16. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2649 indicated? YES -Check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM, then go to step 1 . NO -Go to step 17.
  17. Monitor the OBD STATUS for DTC P2649 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 16 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) . NO --If the HDS indicates FAILED, go to step 1 and recheck. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
  18. Reconnect all connectors.
  19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
  20. Start the engine, and let it idle.
  21. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2649 indicated? YES -Check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 22.
  22. Monitor the OBD STATUS for DTC P2649 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 21 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/mechanical/#vtec) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the rocker arm oil control solenoid and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

Scheme 362

Scheme 362: Rocker Arm Oil Control Solenoid Replacement
Scheme 362: Rocker Arm Oil Control Solenoid Replacement
  1. Disconnect the rocker arm oil control solenoid connector (A).
  2. Remove the rocker arm oil control solenoid (B).
  3. Install the parts in the reverse order of removal with new O-ring (C).

Scheme 363

Scheme 363: Rocker Arm Oil Pressure Switch Removal/Installation
Scheme 363: Rocker Arm Oil Pressure Switch Removal/Installation
  1. Disconnect the rocker arm oil pressure switch connector (A), then remove the rocker arm oil pressure switch (B).
  2. Install the parts in the reverse order of removal with a new O-ring (C).

More articles — Engine