Operator Control Switch (Switch to Battery) - Test
`
320 GX and 323 GX Excavator Machine Systems Troubleshooting
[M0120175]
320 GX and 323 GX Excavator Machine Systems Troubleshooting
CAN Data Link - Test
320 GX and 323 GX Excavator Machine Systems Troubleshooting
Connector Contact Description
ELECTRICAL AND STARTING SYSTEM
SWITCH GP
320 GX and 323 GX Excavator Machine Systems Troubleshooting
Operator Control Switch (Switch to Battery) - Test
320 GX and 323 GX Excavator Machine Systems Troubleshooting
Relay - Test
1.1. Machine ECM 1
2.1. Diagnostic Trouble Code Procedure
3.2. FMI 2
4.2. FMI 3
5.2. FMI 4
The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the operator control switch (switch to battery) of the machine.
Show/hide table
| Machine ECM 1 (MID 299) | |||
|---|---|---|---|
| J1939 | CDL | Code Description | System Response |
| 586-2 | Engine Speed Dial Switch: Data Erratic, Intermittent, or Incorrect | Engine Speed Dial is running as the last value before failure. | |
| 586-9 | Engine Speed Dial Switch: Abnormal Update Rate | Engine Speed Dial is running as the last value before failure. | |
| 4025-3 | Hydraulic Lockout Switch: Voltage Above Normal | Hydraulic lockout switch will not function. | |
| 4025-4 | Hydraulic Lockout Switch: Voltage Below Normal | Hydraulic lockout switch will not function. | |
Show/hide table
| |
| Illustration 1 | g06606862 |
|
Rotary Dial Connections | |
Show/hide table
| |
| Illustration 2 | g06606868 |
|
Hydraulic lock solenoid connections | |
Note: The diagrams above are a simplified schematic of the connections for the operator control switch circuits. The schematics are electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of the electrical schematic for the specific machine being serviced for the complete schematic.
Diagnostic Trouble Code Procedure
Show/hide table
| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Description | Qty |
| T1 | 146-4080(1) | Digital Multimeter Group | 1 |
| 8T-3224 | Needle Tip Group | 1 | |
| 7X-1710 | Multimeter Probe Group | 1 | |
| 8T-8726 | Cable Assembly (Three Pin) (3-Pin Breakout) | 1 | |
| T2 | JERD2129 | Cat® Electronic Technician (ET) Service Tool | 1 |
| Windows-based PC | 1 | ||
| 466-6258 | Communication Adapter Gp | 1 | |
| T3 | 6V-4148 | Connector Repair Kit (Sure Seal) | 1 |
| T4 | 190-8900 | Connector Field Repair Kit (Deutsch) | 1 |
| T5 | 175-3700 | Connector Repair Kit Deutsch DT | 1 |
Show/hide table
| (1) | This multimeter can use an RS232C cable to connect to a Laptop computer or Dataview tool gp for troubleshooting. |
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure. For sensors powered via the fuse panel, check the condition of the appropriate fuse before beginning the troubleshooting procedure.
- Identify the active FMI code associated with the components.
- Determine which code is present and use the list below to determine which procedure to follow.
- FMI 2 diagnostic code, proceed to "FMI 2".
- FMI 3 diagnostic code, proceed to "FMI 3".
- FMI 4 diagnostic code, proceed to "FMI 4".
Show/hide table
| Check the Harness For an Open | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn start switch and disconnect switch OFF. 2. Disconnect the switch from the machine harness. 3. Disconnect the J1 and J2 machine harness connector. 4. At the machine harness connector for the switch, place a jumper wire between the signal contacts. 5. At the machine harness connect for the ECM, measure the resistance between the signal contacts. |
The resistance is less than 5 Ω. | Result: The circuit is correct. Proceed to "Check The Circuit For A Short" Table 4. Result: The resistance is greater than 5K ohms . The circuit is open. Repair: Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K ohms indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω indicates an open in the circuit. Proceed to "Check If The Diagnostic Code Remains" Table 8. |
Show/hide table
| Check The Circuit For A Short | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the start switch and disconnect switch OFF. 2. Disconnect the switch from the machine harness. 3. Disconnect the J1 and J2 machine harness connections from the machine ECM. 4. At the machine harness connector for the ECM, measure the resistance between each of the signal contacts to every other contact used in the J1 and J2 machine harness connectors. |
The resistance is greater than 5K Ω. | Result: The resistance is correct. Proceed to "Check the Battery Source for the Switch" Table 5. Result: The resistance check is not correct. Repair: There are a short in the signal circuits of the machine harness. Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 8. |
Show/hide table
| Check the Battery Source for the Switch | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect all harness connections. 2. Turn the start switch and disconnect switch to the ON position. 3. At the switch, measure voltage between the battery contact and frame ground. |
Voltage is 24 ± .5V | Result: The voltage is correct. Proceed to "Check the Operation of the Switch" Table 7. Result: The voltage is not correct. Proceed to "Check the Fuse" Table 6. |
Show/hide table
| Check the Fuse | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the start switch and the disconnect switch to the OFF position. 2. Check the fuse for the switch. |
The fuse is good. | Result: The fuse is good. Proceed to "Check the Operation of the Switch" Table 7. Repair: The harness for the battery source has failed. Repair or replace the machine harness. Result: The fuse has failed. Replace the fuse. Proceed to "Check If The Diagnostic Code Remains" Table 8. |
Show/hide table
| Check the Operation of the Switch | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the start switch and disconnect switch to the OFF position . 2. Reinstall the signal wire removed in the previous step. 3. Check the operation of the switch. Refer to the table for the suspected faulty switch at the beginning of this procedure for switch operation. |
The switch operates correctly. | Result: The switch is operating correctly. Proceed to "Check If The Diagnostic Code Remains" Table 8. Result: The switch is not operating correctly. The switch has failed Repair: Replace the switch. Proceed to "Check If The Diagnostic Code Remains" Table 8. |
Show/hide table
| Check If The Diagnostic Code Remains | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the start switch and the disconnect switch ON. 3. Clear all DTCs. 4. Operate the machine. 5. Stop the machine and engage the parking brake. 6. Check if the DTC is active. |
The code for the sensor is NO longer present. | Result: The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by a poor electrical connection or a short at one of the harness connections. Resume machine operation. STOP Result: The diagnostic trouble code has not been corrected. Repair: Recheck the circuit and perform this procedure again. If the diagnostic code is still active, replace the sensor. If replacing the sensor does not correct the problem, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may greatly reduce repair time. See Troubleshooting, "ECM - Replace". STOP |
Show/hide table
| Check The Circuit For A Short | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the start switch and disconnect switch OFF. 2. Disconnect the switch from the machine harness. 3. Disconnect the J1 and J2 machine harness connections from the machine ECM. 4. At the machine harness connector for the ECM, measure the resistance between each of the signal contacts to every other contact used in the J1 and J2 machine harness connectors. |
The resistance is greater than 5 K Ω. |
Result: The resistance is correct. Proceed to "Check the Operation of the Switch" Table 10. Result: The resistance check is not correct. Repair: There are a short in the signal circuits of the machine harness. Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 11. |
Show/hide table
| Check the Operation of the Switch | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. The start switch and disconnect switch remain OFF. 2. Reconnect all harness connectors. 3. Check the operation of the switch. Refer to the table for the suspected faulty switch at the beginning of this procedure for switch operation. |
The switch operates correctly. |
Result: The switch is operating correctly. Proceed to "Check If The Diagnostic Code Remains" Table 11. Result: The switch is not operating correctly. The switch has failed Repair: Replace the switch. Proceed to "Check If The Diagnostic Code Remains" Table 11. |
Show/hide table
| Check If The Diagnostic Code Remains | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the start switch and the disconnect switch ON. 3. Clear all DTCs. 4. Operate the machine. 5. Stop the machine and engage the parking brake. 6. Check if the DTC is active. |
The diagnostic code is no longer present. |
Result: The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP. |
Show/hide table
| Check the Harness For an Open | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn start switch and disconnect switch OFF. 2. Disconnect the switch from the machine harness. 3. Disconnect the J1 and J2 machine harness connector. 4. At the machine harness connector for the switch, place a jumper wire between the signal contacts. 5. At the machine harness connect for the ECM, measure the resistance between the signal contacts. |
The resistance is less than 5 Ω. |
Result: The circuit is correct. Proceed to "Check The Circuit For A Short" Table 13. Result: The resistance is greater than 5K ohms . The circuit is open. Repair: Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K ohms indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω indicates an open in the circuit. Proceed to "Check If The Diagnostic Code Remains" Table 17. |
Show/hide table
| Check The Circuit For A Short | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the start switch and disconnect switch OFF. 2. Disconnect the switch from the machine harness. 3. Disconnect the J1 and J2 machine harness connections from the machine ECM. 4. At the machine harness connector for the ECM, measure the resistance between each of the signal contacts to every other contact used in the J1 and J2 machine harness connectors. |
The resistance is greater than 5K Ω. |
Result: The resistance is correct. Proceed to "Check the Battery Source for the Switch" Table 14. Result: The resistance check is not correct. Repair: There are a short in the signal circuits of the machine harness. Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 17. |
Show/hide table
| Check the Battery Source for the Switch | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect all harness connections. 2. Turn the start switch and disconnect switch to the ON position. 3. At the switch, measure voltage between the battery contact and frame ground. |
Voltage is 24 ± .5V |
Result: The voltage is correct. Proceed to "Check the Operation of the Switch" Table 15. Result: The voltage is not correct. Proceed to "Check the Fuse" Table 15. |
Show/hide table
| Check the Fuse | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| A. Turn the start switch and the disconnect switch to the OFF position. B. Check the fuse for the switch. |
The fuse is good. |
Result: The fuse is good. Proceed to "Check the Operation of the Switch" Table 15. Repair: The harness for the battery source has failed. Repair or replace the machine harness. Result: The fuse has failed. Replace the fuse. Proceed to "Check If The Diagnostic Code Remains" Table 17. |
Show/hide table
| Check the Operation of the Switch | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Turn the start switch and disconnect switch to the OFF position . 2. Reinstall the signal wire removed in the previous step. 3. Check the operation of the switch. Refer to the table for the suspected faulty switch at the beginning of this procedure for switch operation. |
The switch operates correctly. |
Result: The switch is operating correctly. Proceed to "Check If The Diagnostic Code Remains" Table 17. Result: The switch is not operating correctly. The switch has failed Repair: Replace the switch. Proceed to "Check If The Diagnostic Code Remains" Table 17. |
Show/hide table
| Check If The Diagnostic Code Remains | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the start switch and the disconnect switch ON. 3. Clear all DTCs. 4. Operate the machine. 5. Stop the machine and engage the parking brake. 6. Check if the DTC is active. |
The code for the sensor is NO longer present. |
Result: The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by a poor electrical connection or a short at one of the harness connections. Resume machine operation. STOP Result: The diagnostic trouble code has not been corrected. Repair: Recheck the circuit and perform this procedure again. If the diagnostic code is still active, replace the sensor. If replacing the sensor does not correct the problem, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may greatly reduce repair time. See Troubleshooting, "ECM - Replace". STOP |
Information System:
323 Excavator
Declaration of Conformity
777E Prime Off-Highway Truck Systems
Service and Parking Brake
C4.4 Engines for Caterpillar Built Machines
Fuel Injection - Engines with a Primary and Secondary Fuel Filter Base
320, 320 GC, 323 and 323 GC Excavator Machine Systems Specifications
Hood
G3512H and G3516H Generator Set Engines
Cylinder Head - Assemble
777E Prime Off-Highway Truck Systems
Modulating Valve (Transmission Hydraulic Control)
320 GX and 323 GX Excavator Systems
Solenoid Valve (Hydraulic Lockout)
777E Prime Off-Highway Truck Systems
Modulating Valve (Torque Converter Lockup Clutch)
Oil Cooler Core Assembly May Get Damaged During Hammer Applications on Certain 349 and 352 Excavators {1374}
C175 Tier 4 Final Engines for Off-Highway Trucks
Coolant Temperature Sensor - Test
320 GC Excavator
Capacities (Refill)
777E Prime Off-Highway Truck Systems
Lines (Brake)
777E Prime Off-Highway Truck Systems
Steering Gear
320 GX and 323 GX Excavator Machine Systems Troubleshooting
Connector Contact Description
320, 320 GC, 323 and 323 GC Excavator Machine Systems Specifications
Front Lines
777E Prime Off-Highway Truck Systems
Wiring - Cab
G3500 Engines
Electronic Control Module (ECM)
Cat Command for Excavating, Remote Control Operator Console for Excavators
Electrical Connector - Inspect
Fuel Correction Factor Calculation Procedure for Certain C32 Generator Set Engines with <NOBR>598-7998</NOBR> Engine Software {1250, 1280, 1900, 1901, 1920}
320 GX and 323 GX Excavator Systems
Check Valve (Return Makeup)
777E Prime Off-Highway Truck Systems
Cylinder Mounting - Suspension
336 Excavator
Engine Oil and Filter - Change
320 GC & 323 GC Excavator
Engine Starting
Payload Calibration When Equipped with Narrow Bucket/Work Tool May Fail on Certain 313 to 352 Excavators {6001, 6101, 6502, 7490, 7494, 7610, 7620}