320D3 GC Excavators Machine Electronic Control System Switch Circuits - Test Caterpillar


Switch Circuits - Test
`
1.1. Machine ECM
2.1. Diagnostic Trouble Code Procedure
3.1. FMI 3
4.1. FMI 6

Machine ECM

The following is a list of codes that are associated with the window washer switch of the machine.

Table 1
Machine ECM (MID 299) 
J1939  DTC  Code Description  System Response 
  2913-3  Window Washer Switch : Voltage Above Normal  Switch will not function. 
  2913-6  Window Washer Switch : Current Above Normal  Switch will not function. 

The Window Washer Switch has one input to the switch panel. The input is normally open. When a circuit is measured with a voltmeter, an open circuit will measure approximately 8 VDC to ground. A closed circuit will measure approximately 0 VDC to ground.

The diagnostic code is recorded when the status of both the inputs are open.



Illustration 1g06575564
Window Wiper Switch schematic

Note: The diagram above is a simplified schematic of the Switch Panel connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, M0116913 for 320D3 GC excavator electrical systems.

Note: The following test procedure may create other diagnostic trouble codes. Ignore these created diagnostic trouble codes and clear the diagnostic trouble codes when the original diagnostic trouble code has been corrected.

Note: The switch in this circuit is enclosed in a module. The switch for this circuit is not independently serviceable. The module must be replaced if the switch fails.

Diagnostic Trouble Code Procedure

Table 2
Required Tools 
Tool  Part Number  Description  Qty 
T1  146-4080(1)  Digital Multimeter Group 
8T-3224 Needle Tip Group 
7X-1710 Multimeter Probe Group 
8T-8726 Cable Assembly (Three Pin) (3-Pin Breakout) 
T2  JERD2129  Cat® Electronic Technician (Cat® ET) 
Windows-based PC 
538-5051 Communication Adapter Gp 
T3  6V-4148  Connector Repair Kit (Sure Seal) 
T4  190-8900  Connector Field Repair Kit (Deutsch) 
T5  175-3700  Connector Repair Kit Deutsch DT 
(1) This multimeter can use an RS232C cable to connect to a Laptop computer or Dataview tool gp for troubleshooting.

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. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing a troubleshooting procedure.

  1. Identify the active FMI code associated with the faulty component.

  2. Determine which code is present and use the list below to determine the correct procedure to follow.

    • FMI 3 diagnostic code, proceed to "FMI 3".

    • FMI 6 diagnostic code, proceed to "FMI 6".

FMI 3

Table 3
Check The Ground Circuit For An Open 
Troubleshooting Test Steps  Values  Results 

1. Turn the disconnect switch and the key start switch to the OFF position.

2. Disconnect the switch from the machine harness.

3. Measure the resistance between frame ground and the "washer" contact on the switch panel. 

The reading is less than 5 Ω. 
Result: The resistance is less than 5 Ω.

Repair: Replace the module for the wiper control.

Proceed to "Check The Signal Circuits In The Harness For An Open" Table 3.

Result: The resistance is greater than 5K Ω.

Repair: The "washer" circuit wire is open in the machine harness. Repair or replace the machine harness.

Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit.

STOP 

Table 4
Check The Signal Circuits In The Harness For An Open 
Troubleshooting Test Steps  Values  Results 

1. Reconnect the "wiper control" module to the machine harness.

2. Disconnect the C301, C302, and C303 harness connectors from the switch panel.

3. At the machine harness connector for the switch panel, check for continuity between "washer" contact and all sources of negative battery.

4. Press the washer switch and release the switch. (Checking the switch for continuity.) 

The continuity check is correct. 
Result: The continuity check is correct.

Proceed to "Check If The Diagnostic Code Remains" Table 3.

Result: The continuity check is not correct.

Repair: There is an open in the signal circuit of the machine harness. Repair or replace the machine harness.

STOP 

Table 5
Check If The Diagnostic Code Remains 
Troubleshooting Test Steps  Values  Results 

1. Inspect the harness connectors and clean the contacts of the harness connectors.

2. Reconnect all harness connectors.

3. Turn key start switch and disconnect switch to the ON position.

4. Operate the machine.

5. Check the status of the diagnostic code. 

The diagnostic code is not active. 
Result: The diagnostic code is no longer active. The problem may be intermittent. Resume normal machine operation.

STOP

NOT OK - The diagnostic code is active. The ECM may have failed.

Result: A failure of the ECM is unlikely. If the cause of the diagnostic code is not found, replace the ECM.

Prior to replacing an ECM, always contact your dealer for possible consultation with AVSpare. This consultation may greatly reduce repair time.

If the ECM must be replaced, refer to Troubleshooting, "ECM - Replace".

STOP 

FMI 6

Table 6
Check the Ground Circuit Of The Switch In The Harness 
Troubleshooting Test Steps  Values  Results 

1. Turn key start switch and disconnect switch to the OFF position.

2. Disconnect the machine harness connectors from the switch panel.

3. Measure the resistance between the "washer" connection on the switch panel and the ground contact. 

The resistance is less than 5 Ω. 
Result: The circuit is correct.

Proceed to "Check The Switch Circuits For A Short To The Ground Circuit" Table 3.

Result: The resistance is greater than 5K Ω. The circuit is open.

Repair: Repair or replace the machine harness.

Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose connection or a corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit.

STOP 

Table 7
Check The Switch Circuits For A Short To The Ground Circuit 
Troubleshooting Test Steps  Values  Results 

1. The machine harness connectors remain disconnected from the switch panel.

2. Turn the disconnect switch and the key start switch to the OFF position.

3. Disconnect the machine harness connector from the "wiper control" module.

4. At the harness connector for the switch panel, measure the resistance between the "washer" contact and all contacts used in the machine harness for the switch panel. 

Each reading is greater than 5K Ω. 
Result: The wiring harness is correct.

Repair: Replace the "wiper control" module.

Proceed to "Check If The Diagnostic Code Remains" Table 3.

Result: One or more of the measurements were less than 5 Ω. A short exists in the wiring harness.

Repair: Repair or replace the machine harness.

Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit.

STOP 

Table 8
Check If The Diagnostic Code Remains 
Troubleshooting Test Steps  Values  Results 

1. Inspect the harness connectors and clean the contacts of the harness connectors.

2. Reconnect all harness connectors.

3. Turn key start switch and disconnect switch to the ON position.

4. Operate the machine.

5. Check the status of the diagnostic code. 

The diagnostic code is not active. 
Result: The diagnostic code is no longer active. The problem may be intermittent. Resume normal machine operation.

STOP

Result: The diagnostic code is active. The ECM may have failed.

Repair: A failure of the ECM is unlikely. If the cause of the diagnostic code is not found, replace the ECM.

Prior to replacing an ECM, always contact your dealer for possible consultation with AVSpare. This consultation may greatly reduce repair time.

If the ECM must be replaced, refer to Troubleshooting, "ECM - Replace".

STOP 

Information System:

320D3 GC Excavators Machine Electronic Control System Solenoid Valve - Test
3512E Locomotive Engines Catalyst (SCR) - Install
320D3 GC Excavators Machine Electronic Control System Sensor Supply - Test
320D3 GC Excavators Machine Electronic Control System Sensor Signal (PWM) - Test
320D3 GC Excavators Machine Electronic Control System Sensor Signal (Analog, Passive) - Test
320D3 GC Excavators Machine Electronic Control System Sensor Signal (Analog, Active) - Test
320D3 GC Excavators Machine Electronic Control System Relay - Test
320D3 GC Excavators Machine Electronic Control System Engine Speed Control - Test
Loader Calibration may Fail on Certain 432 and 444 Back Hoe Loaders {7000, 7490, 7610, 7620}
374 Hydraulic Excavator Machine Systems Cab - Remove and Install
910, 914 and 920 Compact Wheel Loader Power Train Axle (Rear) - Assemble
Caterpillar Switchgear Remote Access System Service Tool Tech-Link is Now Available for All Cat Generator Sets {7002, 7451, 7606, 7635}
320D3 GC Excavators Machine Electronic Control System Window Wiper Delay - Test
320D3 GC Excavators Machine Electronic Control System Connector Contact Description
320D3 GC Excavators Machine Systems Specifications Stick Cylinder
320D3 GC Machine System Swing Motor - Disassemble
320D3 GC Machine System Swing Motor - Assemble
335 Hydraulic Excavator Machine Systems Blade - Remove and Install
335 Hydraulic Excavator Machine Systems Recoil Spring - Disassemble
335 Hydraulic Excavator Machine Systems Recoil Spring - Assemble
M314, M315, M316, M318, M319, and M320 Wheeled Excavator Machine System Calibrations (Cat ET)
Improved Push Button Switch Group (HORN) Is Now Used on Certain Cat Products {1435, 7332}
New EC520 Controller Software is Now Available for Cat GRADE System {7620}
320D3 and 323D3 Excavators Machine System Specifications Hydraulic Tank and Filter