VALVE GP-RELIEF 1266099 - Caterpillar

Illustration 10 g01329453
Typical example (28) Sensor connector (29) Intake valve actuation pressure sensor (30) Fabricated tool
Table 7
Air Pressure Versus Signal Voltage    
Air Pressure (psi)    Range Low (VDC)    Typical Voltage (VDC)    Range High (VDC)    
0     0.3     0.5     0.7    
50     0.8     0.9     1.1    
100     1.2     1.3     1.5    
Table 8
Troubleshooting Test Steps    Values    Results    
7. Test the Intake Valve Actuation Pressure Sensor
A. A pressure regulating assembly will be used to regulate air pressure to the intake valve actuation pressure sensor. Refer to Illustration 10. In addition to the pressure regulating assembly, the technician will need a digital multimeter and two 7X-1708 Multimeter Probes .
The fabricated tool consists of the following fittings and components:
1. 5/16 JIC Female to 1/4 JIC Male
2. 1/4 JIC Female Swivel to 1/4 NPT Male
3. 1/4 to 1/4 Male NPT
4. Pressure regulator
B. Fabricate the above assembly.
C. Turn the keyswitch OFF.
D. Disconnect the connector for the intake valve actuation pressure sensor.
E. Remove the intake valve actuation pressure sensor from the valve cover base.
F. Install the fittings and the pressure regulator onto the intake valve actuation pressure sensor.
G. Connect the connector for the intake valve actuation pressure sensor to the engine harness.
Ensure that the air pressure setting is less than 50 psi before applying air pressure onto the test apparatus.
H. Apply shop air pressure to the assembly.
I. Turn the keyswitch ON.
J. Measure the voltage between terminals 2 and 3 at the sensor connector.
K. Apply the air pressure that is indicated in Table 7 to the intake valve actuation pressure sensor. Record the voltage measurements at the different air pressures.
   
Pressure sensor    
Result: The voltage measurements are within range.
Proceed to Test Step 8.
Result: The voltage measurements are not within the acceptable range.
Replace the intake valve actuation pressure sensor.
Proceed to Test Step 10.
   
8. Perform the Automatic "Cylinder Cutout Test"
A.