5130, 5130B and 5230 Excavators, 784B, 785B, 785C, 789B, 789C, 793B and 793C Off-Highway Truck/Tractors and 992G, 994 and 994D Wheel Loaders Vital Information Management System (VIMS) Caterpillar

VIMS is unable to identify system errors in simple single pole single throw switch circuits that are open or closed. Because the VIMS is unable to identify system errors that involve single pole single throw switch circuits no system event (MID/CID/FMI) information is available to assist the service technician in troubleshooting. When a machine event is in conflict with the present machine operating condition, a possible failure exists in the switch circuitry. An example of this behavior is a FLASHING alert indicator for the brake oil temperature after an overnight shutdown of the machine. Before you troubleshoot, ensure that a problem exists. Refer to the Operation and Maintenance Manual for a description of the normal conditions that trigger a system event. Perform the following procedures only if a failure is suspected. The possible failed conditions for the alert indicator during the normal operation of the VIMS are listed here:

• The alert indicator is always FLASHING for the same parameter. Refer to the “Alert Indicator Always FLASHING (Open Switch)” procedure.

• The alert indicator never FLASHES for a parameter. Refer to the “Alert Indicator Never FLASHES (Shorted Switch)” procedure.

Note: The alert indicator reflects the open condition or grounded condition of the switch inputs. When the input of a switch is open the alert indicator FLASHES and the name of the parameter is shown on the VIMS message center module. When a switch input is grounded, the alert indicator is OFF and no parameter is shown. The switch circuit is tested by opening the switch circuit or the switch circuit is tested by grounding the switch circuit.

Alert Indicator is Always FLASHING. (Open Switch)

This procedure is for the parameter that causes the alert indicator to FLASH all of the time. The continuous FLASHING of the alert indicator is likely to occur because of an open circuit or a failed VIMS interface module.

Procedure

1. LOCATE THE SWITCH.

   1. Locate the switch that corresponds to the parameter that is causing the alert indicator to always FLASH. (If necessary, use the Electrical System Schematic to assist in locating the switch.) Proceed to 2.

2. CHECK THE HARNESS.

   1. Disconnect the signal wire from the switch.

   2. Place a jumper wire from the signal wire to the ground wire. (If a ground wire is not present, connect the signal wire to frame ground.)

      Expected Result: The alert indicator stops FLASHING.

      Result:

      • OK - Alert indicator stops FLASHING. The circuit is operating correctly. The switch has failed. Check the switch or replace the switch. STOP.

      • NOT OK - Alert indicator continues to FLASH. The machine harness is open or the control has failed. Proceed to 3.

3. CHECK THE PULL-UP VOLTAGE.

   1. Use a digital multimeter to measure the pull-up voltage from the signal wire to the ground wire.

      Expected Result:The voltage is 5 ± .5 VDC.

      Result:

      • OK - Voltage is 5 ± .5 VDC. The control has failed. Replace the control. STOP.

      • NOT OK - Voltage is not 5 ± .5 VDC. The harness or the control are the cause. Proceed to 4.

4. CHECK THE HARNESS.

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

   2. Trace the signal wire from the switch to the VIMS interface module on the Electrical System Schematic. Determine the signal contact (connector contact) of the machine harness at the VIMS interface module.

   3. Disconnect the machine harness from the VIMS interface module.

   4. At the machine harness connector for the VIMS interface module, check for continuity between the signal contact and contact 2 or frame ground if a ground wire is not present at contact 2. (The jumper is still in place from 2.)

      Expected Result:The approximate resistance is less than 5.0 ohms.

      Result:

      • OK - Resistance is less than 5.0 ohms. The harness is not causing the failure. The control has failed. Replace the VIMS interface module. Refer to the Testing and Adjusting, "Module-Replace" section. STOP.

      • NOT OK - Resistance is greater than 5.0 ohms. The harness has failed. Repair the harness or replace the harness. STOP.

Alert Indicator Never Flashes. (Shorted Switch)

Procedure

This procedure is used when the alert indicator never FLASHES for any parameter. The alert indicator will not FLASH if the switch is shorted to ground or the VIMS interface module has failed.

1. LOCATE THE SWITCH.

   1. Locate the switch that is responsible for not FLASHING the alert indicator. (If necessary, use the Electrical System Schematic to assist in locating the switch.) Proceed to 2.

2. CHECK THE HARNESS.

   1. Disconnect the signal wire from the switch.

      Expected Result:The alert indicator FLASHES.

      Result:

      • OK - Alert indicator FLASHES. The circuit is operating correctly. The switch has failed. Check the switch or replace the switch.

      • NOT OK - Alert indicator does NOT FLASH. The circuit has failed. The signal wire is probably shorted to ground. Proceed to 3.

3. CHECK THE PULL-UP VOLTAGE.

   1. Use a digital multimeter to measure the pull-up voltage from the signal wire to the ground wire.

      Expected Result:The voltage is 5 ± .5 VDC.

      Result:

      • OK - Voltage is 5 ± .5 VDC. control has failed. Replace the control. STOP.

      • NOT OK - Voltage is not 5 ± .5 VDC. The harness is possibly the cause. Proceed to 4.

4. CHECK THE HARNESS.

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

   2. The signal wire remains disconnected from the switch. Do not allow the wire to touch frame ground.

   3. Trace the signal wire from the switch to the VIMS interface module. Use the Electrical System Schematic to determine the signal contact (connector contact) of the machine harness at the VIMS interface module.

   4. Disconnect the machine harness from the VIMS interface module.

   5. At the machine harness connector for the VIMS interface module, check for continuity between the signal contact and contact 2 or frame ground if a ground wire is not present at contact 2.

      Expected Result:The resistance is greater than 10,000 ohms.

      Result:

      • OK - Resistance is greater than 10,000 ohms. The harness is not causing the failure. The module has failed. Replace the VIMS interface module. Refer to the Testing and Adjusting, "Module-Replace" section. STOP.

      • NOT OK -Resistance is less than 10,000 ohms. The harness has failed. The signal wire within the harness is shorted to ground. Repair the harness or replace the harness. STOP.

Troubleshooting The Action Lamp

Action Lamp - Does not Illuminate During the Power Up Cycle

Illustration 1	g00730011
Schematic of the Action Lamp Circuit

This failure occurs when the current of the action lamp circuit (wire 411-PK(Pink)) is below normal. There is an open circuit. When this failed condition is present the action lamp will NOT illuminate.

Note: The dash indicators illuminate for three seconds upon power up. If the action lamp does NOT illuminate during the power up self test perform the following procedure.

1. CHECK THE ACTION LAMP.

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

   2. Replace the action lamp with a known working lamp.

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

   4. Observe the action lamp.

      Expected Result: The action lamp illuminates during the power up cycle.

      Results:

      • OK - The action lamp illuminates properly during the 3 second start up test. STOP.

      • NOT OK - The action lamp is not the problem. Proceed to 2.

2. CHECK THE HARNESS.

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

   2. Disconnect the machine harness from the VIMS main module.

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

   4. At the machine harness connector for the VIMS main module, check the voltage at contact 1 (170-YL(Yellow)). The voltage must be above 20.5 DCV in order to illuminate the action lamp.

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

   6. Place a jumper wire between contact 1 (170-YL(Yellow)) and contact 20 (411-PK(Pink)).

   7. At the machine harness connector to the VIMS interface module (797), connect J1-25 (J846-WH(White)) to frame ground. On all other VIMS machines, place the jumper wire from the negative post of the LED to frame ground.

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

      Expected Result: The action lamp illuminates.

      Results:

      • OK - The action lamp illuminates. The harness is correct. Replace the VIMS main module. Refer to the Testing and Adjusting, "Module-Replace" section. STOP.

      • NOT OK - The action lamp DOES NOT illuminate. The harness is an open circuit. Proceed to 3.

3. CHECK THE HARNESS.

   1. At the action lamp, disconnect the signal wire (411-PK(Pink)) from the dash socket.

   2. Check for an open circuit in the signal wire. Measure the resistance from contact 20 (wire 411-PK(Pink)) of the VIMS main module connector to the action lamp.

   3. On the 797, check for an open circuit in the ground wire. Measure the resistance between the socket of the action lamp and contact J1-25 (wire J846-WH(White)) of the VIMS interface module. On all other VIMS machines, check for an open circuit in the ground wire from the socket of the action lamp to frame ground.

      Expected Result: There is continuity (less than 5 ohms). The circuits are correct.

      Results:

      • OK - There is continuity. The circuits are correct. STOP.

      • NOT OK - There is NO continuity. The circuits are NOT correct. Repair the machine harness or replace the machine harness. STOP.

Action Lamp - On Continuously

Illustration 2	g00730011

Schematic of the Action Lamp Circuit

This failure occurs when the voltage of the action lamp circuit (wire H430-BU(Blue)) is above normal. This failure results in the continuous illumination of the action lamp.

Note: The dash indicators illuminate for three seconds upon power up. If the action lamp does not shut off after this power up self-test perform this procedure.

1. CHECK THE ACTION LAMP.

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

   2. Disconnect the machine harness from the VIMS main module.

   3. Turn the disconnect switch to the ON position.

   4. Observe the action lamp.

   5. Turn the key start switch to the ON position.

      Expected Result: The action lamp illuminates.

      Results:

      • OK - The action lamp illuminates. Contact 20 (wire 411-PK(Pink)) of the VIMS main module is shorted to +battery. Repair the machine harness or replace the machine harness. STOP.

      • NOT OK - The action lamp is OFF. The VIMS main module has failed. Replace the VIMS main module. Refer to the Testing and Adjusting, "Module-Replace" section. STOP.