VALVE GP-CONTROL 4425627 - Caterpillar

Illustration 1 g00770278
SchematicTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF/RESET position.
Thoroughly inspect ECM connector J1/P1, ECM connector J2/P2, machine connector J3/P3, and all other connectors in the wiring harness. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points. All connections and grounds are tight and free of corrosion.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 2. Check the Sensor Supply Voltage at the Sensor Connector
Disconnect the suspect sensor.
Turn the keyswitch to the ON position.
Use a multimeter to measure the voltage across terminal A (+5V Analog) and terminal B (Analog Return) at the harness side of the suspect sensor connector.
Turn the keyswitch to the OFF/RESET position.Expected Result:The analog sensor supply voltage is 5.0 0.5 VDC.Results:
OK - The supply voltage is reaching the sensor. Proceed to Test Step 3.
Not OK - The supply voltage is not reaching the sensor.Repair: Refer to Troubleshooting, "Analog Sensor Supply Circuit - Test" for the appropriate troubleshooting procedure.STOPTest Step 3. Short the Sensor Signal at the Sensor Connector
Turn the keyswitch to the OFF/RESET position.
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Disconnect the suspect sensor from the harness.
Turn the keyswitch to the ON position.
Check the active diagnostic codes on Cat ET.
Use a suitable piece of wire to short terminal B (Analog Return) and terminal C (Signal) at the harness side of the suspect sensor connector.
Check the active diagnostic codes on Cat ET.Expected Result:The