P1288

DTC P1288: Rocker Arm Oil Pressure Switch Circuit Low Voltage

Special Tools Required
- Pressure gauge adapter 07NAJ-P07010A
- A/T low pressure gauge w/panel 07406-0070300
- A/T pressure hose 07406-0020201
- A/T pressure hose, 2,210 mm 07MAJ-PY4011A
- A/T pressure adaptor 07MAJ-PY40120
- Oil pressure hose 07ZAJ-S5A0200

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Turn the ignition switch OFF.
2. Check the engine oil level.

Is the level OK?

YES - Go to step 3.

NO - Adjust the engine oil to the proper level, then go to step 21.

3. Turn the ignition switch ON (II).
4. Clear the DTC with the HDS.
5. 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 rocker arm oil control solenoid 1, rocker arm oil control solenoid 2, the rocker arm oil pressure switch, the EOP sensor, and the PCM.

NO - Go to step 6.

6. Turn the ignition switch OFF.
7. Disconnect the rocker arm oil pressure switch 2P connector.
8. Turn the ignition switch ON (II).
9. Check the ROCKER ARM OIL PRESSURE SWITCH in the DATA LIST with the HDS.

Does it indicate OFF?

YES - Go to step 15.

NO - Go to step 10.

10. Turn the ignition switch OFF.




11. Remove the rocker arm oil pressure switch (A), and install the special tools as shown, then attach the rocker arm oil pressure switch to the pressure gauge adapter (B).

NOTE: Install the rocker arm oil pressure switch in the reverse order of removal with a new O-ring.

12. Reconnect the rocker arm oil pressure switch 2P connector.
13. Do the VTEC TEST in the INSPECTION MENU with the HDS.
14. Check the oil pressure when the Hi VTEC test is activated.

Is the oil pressure above 40 kPa (0.4 kgf/sq.cm, 5.8 psi)?

YES - Replace the rocker arm oil pressure switch, then go to step 19.

NO - Check the VTEC system oil line, then go to step 19.

15. Turn the ignition switch OFF.
16. Jump the SCS line with the HDS.
17. Disconnect PCM connector C (44P).




18. Check for continuity between rocker arm oil pressure switch 2P connector terminal No. 2 and body ground.

Is there continuity?

YES - Repair short in the wire between the PCM (C33) and the rocker arm oil pressure switch, then go to step 19.

NO - Go to step 27.

19. Turn the ignition switch OFF.
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Reset the PCM with the HDS.
23. Do the PCM idle learn procedure.
24. Do the VTEC TEST in the INSPECTION MENU with the HDS,
25. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P1288 is indicated, check for poor connections or loose terminals at rocker arm oil control solenoid 1, rocker arm oil control solenoid 2, the rocker arm oil pressure switch, the EOP sensor, and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Go to step 26.

26. Monitor the OBD STATUS for DTC P1288 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at rocker arm oil control solenoid 1, rocker arm oil control solenoid 2, the rocker arm oil pressure switch, the EOP sensor, and the PCM, then go to step 1. If the screen indicates EXECUTING, keep testing until a result comes on. If the screen indicates OUT OF CONDITION, go to step 24 and recheck.

27. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
28. Do the VTEC TEST in the INSPECTION MENU with the HDS.
29. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P1288 indicated?

YES - Check for poor connections or loose terminals at rocker arm oil control solenoid 1, rocker arm oil control solenoid 2, the rocker arm oil pressure switch, the EOP sensor, and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 28. If the PCM was substituted, go to step 1.

NO - If no Temporary DTCs or DTCs are indicated, go to step 30. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

30. Monitor the OBD STATUS for DTC P1288 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at rocker arm oil control solenoid 1, rocker arm oil control solenoid 2, the rocker arm oil pressure switch, the EOP sensor, and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 28. If the PCM was substituted, go to step 1. If the screen indicates EXECUTING, keep testing until a result comes on. If the screen indicates OUT OF CONDITION, go to step 28 and recheck.