DTC Troubleshooting
DTC Troubleshooting: 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 07406-0070301
- A/T Pressure Test Hose 07AAJ-PY4A100
- A/T Pressure Adapter 07MAJ-PY40120
- Oil Pressure Hose 07ZAJ-S5AA200
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
1. Turn the ignition switch to LOCK (0).
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 to 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 rocker arm oil pressure sensor, and the PCM.�
NO -
Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the rocker arm oil pressure switch 2P connector.
8. Turn the ignition switch to 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 to LOCK (0).
11. Remove the rocker arm oil pressure switch (A), and attach the special tools as shown, then attach the rocker arm oil pressure switch to the pressure gauge adapter (B).
NOTE: Install the parts 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/cm2, 5.8 psi)?
YES -
Replace the rocker arm oil pressure switch Service and Repair, then go to step 19.
NO -
Check the VTEC system oil line, then go to step 19.
15. Turn the ignition switch to LOCK (0).
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 to LOCK (0).
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II).
22. Reset the PCM with the HDS.
23. Do the PCM idle learn procedure PCM Idle Learn Procedure.
24. Do the VTEC TEST in the INSPECTION MENU with the HDS.
25. Check for Pending or Confirmed 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 rocker arm oil pressure sensor, and the PCM, then go to step 1.
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. If any other Pending or Confirmed DTCs were indicated in step 25, go to the indicated DTC's troubleshooting.�
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 rocker arm oil pressure 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.
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM Initial Inspection and Diagnostic Overview.
29. Do the VTEC TEST in the INSPECTION MENU with the HDS.
30. Check for Pending or Confirmed 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 rocker arm oil pressure sensor, and the PCM. If the PCM was updated, substitute a known-good PCM Initial Inspection and Diagnostic Overview, then go to step 29. If the PCM was substituted, go to step 1.
NO -
Go to step 31.
31. 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 Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 30, go to the indicated DTC's troubleshooting.�
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 rocker arm oil pressure sensor, and the PCM. If the PCM was updated, substitute a known-good PCM Initial Inspection and Diagnostic Overview, then go to step 29. 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 29.