SEAL 7F4446 - Caterpillar

Illustration 1 g01296617
Connections for the accumulate close solenoidThis diagnostic code is associated with the solenoid valve. The "Input high error" means that the module has determined that the voltage of the solenoid circuit is above normalThe possible causes of the diagnostic code are listed:
The solenoid has failed.
The energize circuit of the solenoid is shorted to the +battery circuit.
The module has failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of "Input high error" for pin 25 of the IQAN-XP2 A1 module is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.Test Step 1. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO THE +BATTERY CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors from the solenoid and the module.
At the machine harness connector for the module, measure the resistance from contact IQAN XP2 A1 - 25 (wire K743-OR) to all contacts that are used in the machine harness connectors for the module. Expected Result:Each resistance measurement is greater than 5000 ohms. Results:
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 2.
NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between IQAN XP2 A1 - 25 (K743-OR) and the circuit that has a low resistance measurement. Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.
Inspect the harness connectors and clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Reconnect all harness connectors making sure that the connectors are fully seated and the clips for each connector are completely fastened.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the "Input high error" for pin 25 of the IQAN-XP2 A1 module is active.Expected Result:The "Input high error" for pin 25 of the IQAN-XP2 A1 module is active.Results:
YES - The "Input high error" for pin 25 of the IQAN-XP2 A1 module is active. The problem has not been corrected.Repair: It is unlikely that the module has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the module.STOP
NO - The "Input high error" for pin 25 of the IQAN-XP2 A1 module is not active. The problem does not exist at this time.Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.STOP