3951709 STARTING MOTOR GP-ELECTRIC Caterpillar parts
C7.1
Rating:
Alternative (cross code) number:
CA3951709
395-1709
3951709
CA3951709
395-1709
3951709
GENERATOR SET,
Compatible equipment models: 3951709:
Number on catalog scheme:
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Information:
Which Generate This Code:This diagnostic code is recorded when the system voltage is below 21.3 VDC. If the voltage decreases to a value that is below 18 VDC, the brakes will be applied and the transmission will shift into neutral. The possible causes of this diagnostic code are listed below:
A charging system component has failed.
The wiring in the machine harness has failed.
The ECM has failed. This is unlikely. Test Step 1. CHECK THE BATTERY VOLTAGE.
Start the engine and run at high idle for several minutes.
Measure the battery voltage at the battery posts. Expected Result:Battery voltage should be greater than 21.3 VDC. Results:
OK - Battery voltage is greater than 21.3 VDC. Battery voltage is correct. Proceed to Test Step 2.
NOT OK - Battery voltage is not greater than 21.3 VDC.Repair: The charging system is not correct. Check the charging system. See System Operation, SENR2947, "Starting and Charging System".STOPTest Step 2. CHECK THE SYSTEM VOLTAGE AT THE ECM.
The engine must still be running at high idle.
DO NOT DISCONNECT the machine harness from the ECM. At connector "J1" of the ECM, prepare to make a voltage measurement by using a multimeter.
At the machine harness for the ECM, insert a probe into the back of connector "J1". Measure the voltage (VDC) between J1-31 ( 126-RD) and J1-23 ( 202-BK). Expected Result:Voltage should be greater than 21.3 VDC. Results:
OK - Voltage is greater than 21.3 VDC. Battery voltage is correct. Proceed to Test Step 3.
NOT OK - Voltage is not greater than 21.3 VDC.Repair: The machine harness is not correct. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.
Inspect the harness connectors. 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 in order to make sure that the connectors are fully seated. Also, make sure that 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 diagnostic code is active. Expected Result:The diagnostic code is active.Results:
YES - The diagnostic code is active.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NO - The diagnostic code is not active.Repair: The diagnostic code is NOT present. The problem does not exist at this time. 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. The problem does not exist at this time. Resume normal machine operation.STOP
A charging system component has failed.
The wiring in the machine harness has failed.
The ECM has failed. This is unlikely. Test Step 1. CHECK THE BATTERY VOLTAGE.
Start the engine and run at high idle for several minutes.
Measure the battery voltage at the battery posts. Expected Result:Battery voltage should be greater than 21.3 VDC. Results:
OK - Battery voltage is greater than 21.3 VDC. Battery voltage is correct. Proceed to Test Step 2.
NOT OK - Battery voltage is not greater than 21.3 VDC.Repair: The charging system is not correct. Check the charging system. See System Operation, SENR2947, "Starting and Charging System".STOPTest Step 2. CHECK THE SYSTEM VOLTAGE AT THE ECM.
The engine must still be running at high idle.
DO NOT DISCONNECT the machine harness from the ECM. At connector "J1" of the ECM, prepare to make a voltage measurement by using a multimeter.
At the machine harness for the ECM, insert a probe into the back of connector "J1". Measure the voltage (VDC) between J1-31 ( 126-RD) and J1-23 ( 202-BK). Expected Result:Voltage should be greater than 21.3 VDC. Results:
OK - Voltage is greater than 21.3 VDC. Battery voltage is correct. Proceed to Test Step 3.
NOT OK - Voltage is not greater than 21.3 VDC.Repair: The machine harness is not correct. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.
Inspect the harness connectors. 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 in order to make sure that the connectors are fully seated. Also, make sure that 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 diagnostic code is active. Expected Result:The diagnostic code is active.Results:
YES - The diagnostic code is active.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NO - The diagnostic code is not active.Repair: The diagnostic code is NOT present. The problem does not exist at this time. 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. The problem does not exist at this time. Resume normal machine operation.STOP