CYLINDER GP-HYDRAULIC 4605779 - Caterpillar

Illustration 8 g01241307
Right front view
(8) Unfiltered engine oil pressure sensor
(9) Filtered engine oil pressure sensor
(10) Unfiltered fuel pressure sensor
(11) Filtered fuel pressure sensor
Illustration 9 g01241329
Sensor connector
(Pin A) Sensor supply
(Pin B) Sensor return
(Pin C) Signal
Illustration 10 g01243506
Sensor connector
(Pin A) Sensor supply
(Pin B) Sensor return
(Pin C) Signal Test Step 1. Check for "Active" or "Logged" Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore electrical power to the ECM.
Monitor the diagnostic codes on Cat ET. Check and record any diagnostic codes. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Determine if a diagnostic code has occurred several times. Note: A diagnostic code that is logged several times is an indication of an intermittent problem. Most intermittent problems are the result of a bad connection between a socket and a pin in a connector or a bad connection between a wire and a terminal. The problem may be caused by moisture, corrosion, or wear.
Determine if the problem is active and related to one of the following diagnostic codes:
3
4Expected Result:A diagnostic code is not active.Results:
OK - A diagnostic code is not active.Repair: The problem may be intermittent. If the problem is intermittent, refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
Not OK - A diagnostic code is active. Proceed to Test Step 2.Test Step 2. Check the 5 Volt Supply Voltage at the Sensor Connector
Do not disconnect the suspect connector.
Connect a voltmeter between pin A and pin B on the sensor side of the connector for the suspect sensor.
Measure the voltage between pin A and pin B for the suspect sensor(s).
Wiggle the harness while you monitor the voltage on the voltmeter. Perform the 45 N (10 lb) pull test on each wire in the circuit. Each terminal and each connector should easily withstand 45 N (10 lb) of tension and each wire should remain in the connector body. This test checks whether the wire was properly crimped in the terminal and whether the terminal was properly inserted into the connector. Expected Result:The supply voltage is 5.0 0.5 VDC.Results:
OK - The supply voltage is 5.0 0.5 VDC. An active 3 diagnostic code is present. Proceed to Test Step 3.
OK - The supply voltage is 5.0 0.5 VDC. An active 4 diagnostic code is present. Proceed to Test Step 5.
Not OK - The supply voltage is not 5.0 0.5 VDC.Repair: There is an open in the wiring or connectors between the suspect sensor and the ECM. Inspect the wiring and connectors.STOPTest Step 3. Check for Battery Voltage on the Signal Wire
Measure the voltage on the harness side of the sensor connector between pin B and pin C for the suspect sensor(s). Expected Result:The signal voltage is less than Battery voltage.Results:
OK - The signal voltage is less than Battery voltage. Proceed to Test Step 4.
Not OK - The signal voltage is equal to Battery voltage.Repair: There is a short in the harness to the Battery. Repair the wiring.STOPTest Step 4. Create a Short at the Sensor Connector
Remove electrical power