Marine Multi-Station Control System Caterpillar

The throttles are not qualified.

During station transfer, the requesting control station throttle position is not with 10 percent of the active station throttle position.

If the throttle remains not qualified for over 10 seconds, then the "Throttle Not Qualified" diagnostic alarm shall be activated and the affected engine will be commanded to Idle speed. This diagnostic alarm shall be de-activated when the throttle is qualified.

Troubleshooting:

The throttles are not qualified for the active control station. This error code will only occur on the active station. This error code can be caused by operator error. In this case, the error code may not indicate a problem with the control system.

If this error code is active when an integrated control head (ICH) is the active station, replace the ICH. If this error code is active when a slim line control head or the side mount control head is the active station, continue with this procedure.

Test Step 1. ACTIVATE THE STATION AND DUPLICATE THE PROBLEM.

1. Turn the keyswitch ON.

2. Activate the suspect station.

3. Ensure that the diagnostic code is active.

Expected Result:

The diagnostic code is active.

Results:

• OK - The diagnostic code is active. Go to Test Step 2.

• NOT OK - The diagnostic code is NOT active.

  STOP

Test Step 2. CHECK ELECTRICAL CONNECTORS AND WIRING.

1. Turn the keyswitch OFF.

2. Inspect the wiring from the control station processor to the slim line control head or the side mount control head for the following conditions:

   • Abrasion

   • Corrosion

   • Incorrect attachment

   • Pinch points

3. Ensure that the following items are correctly mated and are in good condition: connectors, pins and sockets.

Expected Result:

All of the following are properly mated and in good condition: connectors, pins, and wires.

Results:

• OK - All connectors, pins, and wires are properly mated and in good condition. Go to Test Step 3.

• NOT OK - All connectors, pins, and wires are NOT properly mated and in good condition.

  Repair: Repair the parts or replace the parts.

  After the repair, verify that the diagnostic code is NOT active.

  STOP

Test Step 3. CHECK THE OPERATION OF THE SLIM LINE CONTROL HEAD OR THE SIDE MOUNT CONTROL HEAD.

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Illustration 1	g01029957

1. Disconnect the cable between the control station processor and the slim line control head or the side mount control head. Refer to Illustration 1.

2. Insert a 12-pin breakout T between the control station processor and the processor for the slim line control head or the side mount control head. Refer to Illustration 1.

3. Use a digital volt meter (DVM) in order to verify the operation of the slim line control head or the side mount control head. Refer to Table 1.
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   Table 1

   Measure from Pin	Measure to Pin	Minimum	Maximum
   1 (+Vref)	3 (return)	4.75 VDC	5.25 VDC(1)
   2 (throttle)	3 (return)	0.6 VDC	5.0 VDC(2)

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   (1)	The nominal voltage is 5.00 VDC
   (2)	The minimum voltage and the maximum voltage will vary. This depends on where the throttle dead bands are set. The voltages should be the same for forward throttle and reverse throttle.

Expected Result:

The voltages are within the limits that are listed in Table 1.

Results:

• OK - The voltages are within the limits that are listed in the table.

  Repair: Replace the control station processor.

  After the repair, recheck the operation of the control head in order to ensure that the diagnostic code is NOT active.

  STOP

• NOT OK - The voltages are NOT within the limits that are listed in the table.

  Repair: Replace the slim line control head or the side mount control head.

  After the repair, recheck the operation of the control head in order to ensure that the diagnostic code is NOT active.

  STOP