The system uses two sets of four indicator lights to convey system status to the operator and anyone working in the area around the machine. The blue, green, and red indicators are used to convey the remote control system status to anyone working near the machine.
Each indicator has 3 circuits:
Enable - Is signal line being controlled from the RCM. This signal line must be activated to control the beacon illumination. The RCM uses 24V to send an enable signal to each indicator. The RCM may flash the Indicator by switching the circuit on or off.
Power - Is sourced from the Auxiliary Power Relay to power the indicator.
Ground - Is common machine ground. (The Green indicator uses the ground to the Mode Select Relay, The Mode Select Relay also sets the RC Enable status of Each ECM).
Fault Detection - On the indicator circuits, Power and Ground do not have any diagnostics. The Manned indicator (green) does not have any diagnostics. Diagnostics from the RCM indicator enable are checked at startup when the indicators flash. The diagnostics do not latch but will be logged.
The Indicator is Not Illuminated
- The indicator has failed
- The Power Wire from the machine has an open or low voltage
- The Ground Wire to the machine is open, high resistance, or short to Battery +
- The Enable wire from the RCM to the indicator is Open or Short to Ground
The Indicator is Illuminated Incorrectly
- The indicator has failed
- The Enable Wire from the RCM to the indicator is shorted to another circuit
The following is a list of codes that are associated with the Implement ECM location code of the machine.
| Remote Control ECM (MID 126) | ||
|---|---|---|
| DTC | Code Description | System Response |
| 4555 - 06 | Unmanned Stop Indicator - Current Above Normal | The Blue Mode indicator is not illuminated. |
| 4557 - 06 | Unmanned Stop Indicator - Current Above Normal | The Yellow Proximity indicator is not illuminated. |
| 4558 - 06 | Unmanned Stop Indicator - Current Above Normal | The Red Stop indicator is not illuminated. |
These diagnostics are related to the remote control indicator lights. Indicator Enable is either sourced from the Remote Control ECM (Blue, Red, or Yellow) or machine power (Green). The Manned indicator (green) does not have any diagnostics. Diagnostics are checked at each startup of machine.
Possible causes for an FMI 6 diagnostic code are:
- The enable wire from Remote Control ECM to the Remote Control indicator is shorted
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| Illustration 1 | g06272051 |
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RC indicator mini schematic | |
Note: The diagram above is a simplified schematic of the RCM and Indicators. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision for the complete schematic.
Reference: Electrical Schematic, UENR6445, UENR6982, UENR7133
Diagnostic Trouble Code Procedure
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.
| FMI 06 Troubleshooting | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Check The Harness For Short A. Turn the key start switch and disconnect switch ON position. B. Disconnect the machine harness from both indicators. C. Disconnect the machine harness from the RCM. D. At the RCM harness, measure the resistance between all the other contacts used in the RCM. E. At both indicators, measure the resistance between enable and all the other contacts used in the indicator. |
The resistance measurements are greater than 5K Ω |
OK - Each resistance measurement is greater than 5 Ω. The machine harness is correct. Proceed to Test Step 2. NOT OK - Each resistance measurement is not greater than 5 Ω. A short circuit exists between the signal circuit and the circuit with the low-resistance measurement. Repair: Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit. Proceed to Test Step 2. |
| 2. Check The Indicator A. Turn key switch and disconnect switch OFF position. B. Reconnect the harness to the Remote Control ECM. C. Both Indicator Harnesses are disconnected . D. Turn the Battery disconnect and RC Run Switch to On positions. E. Determine if the Diagnostic counter increases. |
The Logged Diagnostic increases. |
OK - Diagnostic indicator Increases. Proceed to Test Step 3. NOT OK - The Diagnostic Indicator does not increase. Repair: Replace the indicator. Proceed to Test Step 3. |
| 3. Check The RCM A. Reconnect all harness connectors. Return machine to normal operating condition. B. Disconnect the Indicator Enable wire from the RCM. C. Turn the Battery disconnect and RC Run Switch to On. D. Clear all diagnostic codes. D. Operate the machine. E. Stop the machine and engage the E-Stop. F. Check if the diagnostic code is active. |
The Logged Diagnostic increases. |
OK - Diagnostic indicator Increases. Proceed to Test Step 4. NOT OK - The Diagnostic Indicator does not increase. Repair: Replace the indicator. Proceed to Test Step 4. |
| 4. Check If The Diagnostic Code Remains A. Reconnect all harness connectors. Return machine to normal operating condition. B. Turn the key start switch and the disconnect switch ON. C. Clear all diagnostic codes. D. Operate the machine. E. Stop the machine and engage the safety lock lever. F. Check if the diagnostic code is active. |
The diagnostic code is no longer present. |
OK - The diagnostic code does not exist now. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. NOT OK - 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 Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP. |