HOOD & GUARD GP 3118061 - Caterpillar

Table 1
Steering Pump Oil Pressure Sensor 2 Signal PWM Duty Cycle versus Pressure    
Pressure     Duty Cycle (Percent)     Pressure     Duty Cycle (Percent)    
6895 kpa (1000 psi)     22.5     24.1 mpa (3500 psi)     66    
13.8 mpa (2000 psi)     40     25.6 mpa (4000 psi)     75    
17.2 mpa (2500 psi)     49     31.0 mpa (4500 psi)     84    
20.7 mpa (3000 psi)     57     34.5 mpa (5000 psi)     92    Possible causes of the diagnostic code are listed below:
The supply circuit is open.
The return circuit is open.
The signal circuit is shorted high.
The signal circuit is open.
The sensor has failed.
The ECM has failed. ECM failure is unlikely.Note: Ensure that the CID 3653 FMI 03 diagnostic code is active. This procedure can cause new diagnostic codes to be recorded. Ignore these created diagnostic codes. When the procedure is completed, clear the created diagnostic codes.Test Step 1. CHECK THE VOLTAGE AT THE SENSOR
Turn the disconnect switch and the key start switch to the ON position.
Disconnect the sensor from the machine harness.
At the machine harness connector for the sensor, measure the voltage between contact 1 (wire A105-OR) and contact 2 (wire X719-OR).Expected Result:The voltage measurement is approximately 8 VDC.Results:
OK - The voltage measurement is approximately 8 VDC. Proceed to test step 4.
NOT OK - The voltage is not approximately 8 VDC. There is an open in the machine harness or the ECM has failed. The failed condition of the ECM is unlikely. Proceed to test step 2. Test Step 2. CHECK FOR AN OPEN IN THE SUPPLY CIRCUIT
The key start switch and the disconnect switch remain in the ON position.
The sensor remains disconnected from the machine harness.
At the machine harness connector for the sensor, measure the voltage from contact A (wire A105-OR) to ground. Expected Result:The voltage measurement is approximately 8 VDC. Results:
OK - The voltage measurement is approximately 8 VDC. Proceed to test step 3.
NOT OK - The voltage does not measure approximately 8 VDC. The supply circuit is not correct. Repair: Repair or replace the circuit.STOPTest Step 3. CHECK FOR AN OPEN IN THE RETURN CIRCUIT
Turn the key start switch and the