PUMP GP-PISTON 2197225 - Caterpillar

Illustration 1 g01620803
Schematic of the "Transmission Clutch (Solenoid 4)"
Note: The approximate coil resistance of the solenoid is 8.7 .4 ohms at 25 °C (77.0 °F).This diagnostic code is recorded when the ECM reads the current of the solenoid as above normal (short to ground).Note: This procedure can cause new diagnostic codes to be recorded. Ignore these created diagnostic codes. Complete the following procedure. Then clear the created diagnostic codes.Test Step 1. CHECK THE SOLENOID.
Turn the disconnect switch and the key start switch to the ON position. DO NOT start the engine. Ensure that the diagnostic code for the solenoid is active.
Disconnect the machine harness from the solenoid.
Observe the status of the diagnostic code. The diagnostic code is active or the diagnostic code is NOT active. Expected Result:When the solenoid is disconnected, the diagnostic code changes. The diagnostic code is NOT active.Results:
YES - The circuit is correct. The solenoid has failed.Repair: Repeat this test step "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid.STOP
NO - The diagnostic code remains active. Proceed to test step 2.Test Step 2. CHECK THE SIGNAL CIRCUIT OF THE SOLENOID FOR A SHORT.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness from the solenoid.
Disconnect the J1 and J2 machine harness connectors from the ECM.
At the J1 and J2 machine harness connectors for the ECM, measure the resistance from the signal contact of the solenoid J1-61 (wire 755-OR(Orange)) to ground. Expected Result:The resistance that is measured is greater than 5 ohms.Results:
YES - The resistance that is measured is greater than 5 ohms. The machine harness is correct. Proceed to test step 3.
NO - The resistance that is measured is less than 5 ohms. There is a short in the machine harness.Repair: The short is between the signal contact of the solenoid and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the contacts of the harness connectors. Clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Clear all of the inactive diagnostic codes.
Stop the machine. Then place the parking brake switch in the ON position.
Observe the status of the diagnostic code. The diagnostic code is present or the diagnostic code is NOT present. Expected Result:The diagnostic code for the relay is NO longer present.Results:
YES - The diagnostic code is NOT present.Repair: The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor electrical connection and/or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP
NO - The diagnostic code has not been corrected. It is unlikely that the ECM has failed.Repair: Exit this procedure and perform this diagnostic code again. Recheck the status of the diagnostic code. The diagnostic code is active or the diagnostic code is NOT active. Replace the ECM