KIT-HYD CYLINDER SEAL 3925198 - Caterpillar

Illustration 8 g00896288
Harness connector for the PWM sensors (A) 8 volt supply or 5 volt supply (B) Return
At the harness connector for the suspect sensor, measure the voltage between terminals A and B.Expected Result:The voltage is between 7.6 VDC and 8.4 VDC. If you are troubleshooting the humidity sensor, the voltage is between 4.5 VDC and 5.5 VDC.Results:
OK - The voltage is within the specification. The correct voltage is present at the sensor connector. Proceed to Test Step 5.
Not OK - The voltage is not within the specification. The correct voltage is not present at the sensor connector. The correct voltage must be present at the sensor connector in order to continue this procedure. The wiring problem may be inside the terminal box, or in the engine harness.Repair: Verify that the wiring and/or connectors are OK. Repair any faulty wiring and/or connectors, when possible. Replace any faulty wiring and/or connectors, if necessary. Refer to Troubleshooting, "Inspecting Electrical Connectors". Stop.Test Step 5. Verify that +Battery Voltage is Not Present in the Signal Wire
At the harness connector for the suspect sensor, measure the voltage between terminals B and C.Expected Result:The voltage is between 7.0 VDC and 8.0 VDC.Results:
OK - The voltage is between 7.0 VDC and 8.0 VDC. The battery voltage is not present in the signal wire. Proceed to Test Step 6.
Not OK - The voltage is approximately equal to the battery voltage. The signal wire is probably shorted to the battery between the sensor and the master ECM.Repair: Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine. Repair the harness, when possible. Replace the harness, if necessary. Stop.
Not OK - The voltage is approximately 0 volts. The signal wire is probably shorted to ground between the sensor and the master ECM.Repair: Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine. Repair the harness, when possible. Replace the harness, if necessary. Stop.Test Step 6. Check the Signal at the Sensor
Set the engine control to the OFF/RESET mode.
Install a 8T-8726 Adapter Cable As (Three-Pin Breakout) at the harness connector for the suspect sensor.
Connect a multimeter to terminals B and C of the breakout t.
Set the engine control to the STOP mode.
Measure the duty cycle and the frequency of the suspect sensor.Expected Result:The duty cycle is between 5 percent and 95 percent for the boost pressure sensor, for the engine coolant pressure sensor, for the inlet manifold pressure sensor, or for the atmospheric pressure sensor. The duty cycle is between 10 and 90 percent for the humidity sensor.The frequency is between 400 and 600 Hz.Results:
OK - The duty cycle is between 5 percent and 95 percent for the boost pressure sensor, for the engine coolant pressure sensor, for the inlet manifold pressure sensor, or for the atmospheric pressure sensor. The duty cycle is between 10 and 90 percent for the humidity sensor. The frequency is between 400 and 600 Hz. A valid signal is produced by the sensor. Proceed to