WASHER 1793037 - Caterpillar

System Operation Description:Troubleshooting ProcedureUse this procedure to diagnose mechanical problems or electrical problems with the intake valve actuation system. The following diagnostic codes indicate that there is a mechanical problem or an electrical problem with the system:
Illustration 1 g02725693
(1) Control valve (2) Pressure sensor (3) Check valve (4) Actuators
Table 1
Diagnostic Codes for Mechanical Problems or Electrical Problems with the Intake Valve Actuation System    
J1939 Code    CDL Code    Description    Conditions Which Can Cause The Code    
2949-7     1922-7     Intake Valve Actuation Oil Pressure not responding     This code can only occur soon after the engine has started.
This code indicates that the difference in rail pressure is incorrect while the control valve is opened and closed. The following conditions can cause this code:
A control valve that contains debris or a control valve that is not operating correctly
Damaged O-ring seal or missing O-ring seal.    
2950-7     1901-7     Intake Valve Actuator #1 not responding     The intake valve actuator is not responding correctly to the commands from the ECM. This can be caused by the following conditions:
There is an oil leak in the system.
There is a problem with an actuator.
The valve lash is incorrect.
The adjustment of an actuator is incorrect.    
2951-7     1902-7     Intake Valve Actuator #2 not responding    
2952-7     1903-7     Intake Valve Actuator #3 not responding    
2953-7     1904-7     Intake Valve Actuator #4 not responding    
2954-7     1905-7     Intake Valve Actuator #5 not responding    
2955-7     1906-7     Intake Valve Actuator #6 not responding    
2948-7     E1101 (2)     Engine Intake Valve Actuation System Oil Pressure : Not Responding Properly     The Engine Intake Valve Actuation System Oil Pressure did not change when the Engine Intake Valve Actuation System Oil Pressure solenoid is toggled.    
2948-17     E488 (2)     Engine Intake Valve Actuation System Oil Pressure : Low - moderate severity (2)     The Engine Intake Valve Actuation System Oil Pressure solenoid is commanded closed, but the oil pressure does not go up.    
Follow the troubleshooting procedure in order to identify the root cause of the problem.    Note: Resolve any electrical problems with the system before you use this procedure.SymptomsThe following symptoms may occur if there is a problem with the intake valve actuation system.
Intermittent check engine light
Intermittent reductions in engine powerYou may need to apply a load to the engine in order to verify that the problem is resolved. The test must be performed at 75 percent of the engine's rated fuel rate for at least 30 seconds.
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check the Engine Oil Level
A. Stop the engine. Allow the engine to cool approximately 20 minutes so the oil level can stabilize.
B. Check the engine oil level.
   
Oil level    
Result: The engine oil level is OK.
Record the engine oil level. Verify that the dipstick is calibrated correctly. Refer to Operation and Maintenance Manual, "Engine Oil Level Gauge - Calibrate".
Proceed to