GLASS (UNTINTED) 2D3738 - Caterpillar

Table 7
Troubleshooting Test Steps Values Results
6. Check the Check Valve
A. Remove the check valve.
B. Inspect the check valve. Look for debris that could cause the check valve to stick.
Check valve
Result : The check valve is "OK".
Proceed to Test Step 7.
Result : The check valve is damaged.
Repair : Replace the check valve. Proceed to Test Step 10.
A E488 (2), E1101 (2), 2498-7, 1922-7, 2949-7 or 2948-17 code is active or logged. proceed to Test Step 7.
Result: A 2950-7 through 2955-7 or a 1901-7 through 1906-7 code is active or logged.
Proceed to Test Step 8.
Illustration 10 g01329453
Typical example
(28) Sensor connector
(29) Intake valve actuation pressure sensor
(30) Fabricated tool
Table 8
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 9
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:
5/16 JIC Female to 1/4 JIC Male
1/4 JIC Female Swivel to 1/4 NPT Male
1/4 JIC Maleto 1/4 NPT Male
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.
Note : 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 8 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.
Repair : Replace the intake valve actuation pressure sensor.
Proceed to Test Step 10.
8. Perform the Automatic "Cylinder Cutout Test"
A. Start the engine.
B. Access the "Cylinder Cutout Test" in the "Diagnostic Tests" under the "Diagnostics" menu.
C. Select the "Automatic Cylinder Cutout Test" on Cat ET.
D. Start the test.
Cylinder Cutout Test
Result : All of the cylinders indicated "OK" during the "Cylinder Cutout Test".
Proceed to Test Step 9.
Result : One or more cylinders failed the "Cylinder Cutout Test".
Repair : Diagnose the problem and then repair the cylinders that failed the "Cylinder Cutout Test" before continuing with this procedure. Clear all logged diagnostic codes. Verify that the repair has eliminated the problem in the cylinder.
Proceed to Test Step 10.
9. Set the Lash Settings for the Intake Valve actuator
A. Turn the keyswitch OFF.
B. Allow the engine to cool.
C. Remove the valve cover or covers