VALVE GP-MAIN CONTROL 4515890 - Caterpillar

Illustration 1 g00862228
Schematic for the Tip Back SolenoidThis diagnostic code is recorded when the ECM detects a short to the +battery in the electrical path. The electrical path goes from the ECM to the solenoid and back to the ECM. The return circuit is connected for all solenoids. The return circuit connects to contacts J1-7 and J2-3 (wire 716-WH) of the implement ECM.The possible causes of this diagnostic code are listed:
The signal circuit from the ECM to the solenoid valve is shorted to the +battery.System Response:The machine response is listed:
The blade will tip back or the tip back solenoid will be powered continuously until the fault is removed and the joystick control is centered.
Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code is corrected. Note: Ensure that the diagnostic code is active and that the diagnostic code indicator is active.Test Step 1. CHECK THE SOLENOID.
Turn the key start switch to the OFF position.
Disconnect the solenoid with the diagnostic code from the harness.
Turn the key start switch to the ON position.
Place the shift selector switch in the NEUTRAL position.
Engage the parking brake.
At the connector for the solenoid, measure the voltage from the ECM between contact 1 (wire H716-WH) and contact 2 (wire E919-YL). Note: This test causes the ECM to log an open circuit diagnostic code for this solenoid. Clear this diagnostic code from the ECM after troubleshooting.Expected Result: The voltage is approximately 5 DCV.Results:
YES - The voltage is approximately 5 DCV.Repair: The solenoid has failed. Replace the solenoid. Stop.
NO - The voltage is approximately battery voltage. Proceed to Test Step 2.Test Step 2. CHECK THE HARNESS.
Turn the key start switch to the OFF position.
Disconnect the harness from the ECM.
Turn the key start switch to the ON position.
At the harness connector for the ECM, measure the voltage between contact J1-2 (wire A272-BK) and contact J2-1 (wire E919-YL).Expected Result:The voltage is approximately battery voltage.Results:
YES - The voltage is approximately battery voltage.Repair: There is a short to the +battery in the harness. Repair the harness or replace the harness. Stop.
NO - The voltage is approximately 0 DCV. The cause or the diagnostic code has not been found. Proceed to Test Step 3.Test Step 3. ENSURE THAT THE DIAGNOSTIC CODE REMAINS ACTIVE.
Turn the key start switch to the OFF position.
Inspect all harness connectors and reconnect.
Turn the key start switch to the ON position.
Enter service mode.
Operate the machine. Ensure that the same diagnostic code is active.Expected Result:The diagnostic code is active.Results:
OK - The diagnostic code is active.Repair: The diagnostic code has not been corrected. It is unlikely that the ECM has failed. Exit this procedure. Perform this test procedure again. If the cause of the diagnostic code is not found, replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.
NOT OK - The diagnostic code is NOT active. Repair: The diagnostic code is inactive at this time. The initial diagnostic code was probably caused