1843945 HYDRAULIC AR Caterpillar parts
320C
Rating:
Alternative (cross code) number:
CA1843945
184-3945
1843945
CA1843945
184-3945
1843945
EXCAVATOR,
Compatible equipment models: 1843945:
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Caterpillar SIS machinery equipment:
Caterpillar parts catalog:
Information:
circuit diagnostic code is not active. An open circuit diagnostic code is not active. An intermittent fault may exist.Repair: Use the electronic service tool to perform a "Wiggle Test". If faults are indicated, then go to the appropriate procedure. STOPTest Step 4. Disconnect The Sensor In Order To Create An Open Circuit
Turn the keyswitch to the OFF position.
Disconnect the connector for the sensor with the short circuit diagnostic code.
Turn the keyswitch to the ON position. Wait for at least 10 seconds for activation of the diagnostic codes.
Use the electronic service tool to check the "Active Diagnostic Code" screen. Check for an open circuit diagnostic code.Expected Result:An open circuit diagnostic code for the disconnected sensor is now active.Results:
OK - A voltage above normal diagnostic code was active before disconnecting the sensor. An open circuit diagnostic code became active after disconnecting the sensor. Proceed to Test Step 6.
Not OK - There is a short circuit between the sensor harness connector and the ECM. Leave the sensor disconnected. Proceed to Test Step 8.Test Step 5. Measure the Sensor Supply Voltage
Turn the keyswitch to the OFF position.
Disconnect the sensor from the engine harness.
Turn the keyswitch to the ON position.
Measure the voltage at the plug for the sensor from the terminal 1 (pressure sensor supply) to terminal 2 (sensor common).Expected Result:The voltage from terminal 1 to terminal 2 measures 4.84 to 5.16 V.Results:
OK - The sensor supply voltage is correct. Proceed to Test Step 7.
Not OK - The sensor supply voltage is out of the nominal range. Continue testing the sensor supply circuit.Repair: Go to Troubleshooting, "5 Volt Sensor Supply Circuit - Test".STOPTest Step 6. Determine if the Short Circuit is in the Connector or in the Sensor
Thoroughly inspect the connector for moisture.
Inspect the seals and reconnect the sensor. Refer to Troubleshooting, "Electrical Connectors - Inspect".
If the short circuit diagnostic code reappears, the sensor or the sensor connector has a fault.Expected Result:The short circuit diagnostic code is still present.Results:
OK - There is a fault in the sensor.Repair: Perform the following procedure:
Temporarily connect a new sensor to the harness but do not install the new sensor in the engine.
Use the electronic service tool to verify that the replacement sensor eliminates the fault.
If the diagnostic code is eliminated, install the replacement sensor.
Use the electronic service tool to clear the logged diagnostic codes.STOP
Not OK - Repair the engine harness connector. Use the electronic service tool to clear the logged diagnostic codes.
STOPTest Step 7. Create a Short Circuit Between the Signal and the Common Terminals at the Engine Harness Connector
Turn the keyswitch to the ON position.
Fabricate a jumper wire that is 150 mm (6 inch) long. Crimp a terminal to both ends of the wire.
Monitor the "Active Diagnostic Code" screen of the electronic service tool before installing the jumper wire and after installing the jumper wire.
Install the jumper on the engine harness connector. Install one end of the jumper at the sensor signal (terminal 3). Install the other end of the jumper at the common connection for
Turn the keyswitch to the OFF position.
Disconnect the connector for the sensor with the short circuit diagnostic code.
Turn the keyswitch to the ON position. Wait for at least 10 seconds for activation of the diagnostic codes.
Use the electronic service tool to check the "Active Diagnostic Code" screen. Check for an open circuit diagnostic code.Expected Result:An open circuit diagnostic code for the disconnected sensor is now active.Results:
OK - A voltage above normal diagnostic code was active before disconnecting the sensor. An open circuit diagnostic code became active after disconnecting the sensor. Proceed to Test Step 6.
Not OK - There is a short circuit between the sensor harness connector and the ECM. Leave the sensor disconnected. Proceed to Test Step 8.Test Step 5. Measure the Sensor Supply Voltage
Turn the keyswitch to the OFF position.
Disconnect the sensor from the engine harness.
Turn the keyswitch to the ON position.
Measure the voltage at the plug for the sensor from the terminal 1 (pressure sensor supply) to terminal 2 (sensor common).Expected Result:The voltage from terminal 1 to terminal 2 measures 4.84 to 5.16 V.Results:
OK - The sensor supply voltage is correct. Proceed to Test Step 7.
Not OK - The sensor supply voltage is out of the nominal range. Continue testing the sensor supply circuit.Repair: Go to Troubleshooting, "5 Volt Sensor Supply Circuit - Test".STOPTest Step 6. Determine if the Short Circuit is in the Connector or in the Sensor
Thoroughly inspect the connector for moisture.
Inspect the seals and reconnect the sensor. Refer to Troubleshooting, "Electrical Connectors - Inspect".
If the short circuit diagnostic code reappears, the sensor or the sensor connector has a fault.Expected Result:The short circuit diagnostic code is still present.Results:
OK - There is a fault in the sensor.Repair: Perform the following procedure:
Temporarily connect a new sensor to the harness but do not install the new sensor in the engine.
Use the electronic service tool to verify that the replacement sensor eliminates the fault.
If the diagnostic code is eliminated, install the replacement sensor.
Use the electronic service tool to clear the logged diagnostic codes.STOP
Not OK - Repair the engine harness connector. Use the electronic service tool to clear the logged diagnostic codes.
STOPTest Step 7. Create a Short Circuit Between the Signal and the Common Terminals at the Engine Harness Connector
Turn the keyswitch to the ON position.
Fabricate a jumper wire that is 150 mm (6 inch) long. Crimp a terminal to both ends of the wire.
Monitor the "Active Diagnostic Code" screen of the electronic service tool before installing the jumper wire and after installing the jumper wire.
Install the jumper on the engine harness connector. Install one end of the jumper at the sensor signal (terminal 3). Install the other end of the jumper at the common connection for
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