3606, 3608, 3612 and 3616 Engines and C280-12, C280-16, C280-6 and C280-8 Marine Engines Generator Monitoring System Caterpillar

Note: The 163-0096 Diagnostic and Calibration Tool can be used in order to troubleshoot this component. Refer to the "Owner's Manual" for more information.

The following procedure should be used in order to troubleshoot a transducer.

Illustration 1	g00563605

Illustration 2	g00563611

1. Check the electrical connectors and check the wiring.

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   Bodily contact with electrical potential can cause bodily injury or death. To avoid the possibility of injury or death, ensure that the main power supply has been disconnected before performing any maintenance or removing any modules.

   1. Disconnect the power supply.

   2. Check the electrical connectors and check the wiring for damage or bad connections.

   3. Verify that all modules are properly seated.

   4. Verify the status of the LED on the SLC 5/04 - 5/05.

      The results of the preceding procedure are in the following list:

      • All of the components are fully installed. All of the components are free of corrosion. All of the components are free of damage. All of the modules are properly seated. Proceed to 2.

      • The components are not fully installed. The components are not free of corrosion. The components are damaged. All of the modules are not properly seated. Repair the component. Verify that the repair resolves the problem. STOP.

2. Monitor the transducer with an ammeter.
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   Illustration 3	g00563603
   Diagram of the ammeter connection

   1. Connect an ammeter in the circuit. See illustration 3.

   2. Monitor the ammeter for the correct output of the transducer. See table 1 for the transducer's information.
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      Table 1

      Current (mA)	141-9880 Transducer (1)	141-4003 Transducer (2)
      4.0	0 kPa ( 0.0 psi)	0 kPa (0.0 psi)
      4.5	31.3 kPa (4.5 psi)	125.0 kPa (18.1 psi)
      5.0	62.5 kPa (9.1 psi)	250.0 kPa (36.3 psi)
      5.5	93.8 kPa (13.6 psi)	375.0 kPa (54.4 psi)
      6.0	125.0 kPa (18.1 psi)	500.0 kPa (72.5 psi)
      6.5	156.3 kPa (22.7 psi)	625.0 kPa (90.6 psi)
      7.0	187.5 kPa (27.2 psi)	750.0 kPa (108.8 psi)
      7.5	218.8 kPa (31.7 psi)	875.0 kPa (126.9 psi)
      8.0	250.0 kPa (36.3 psi)	1000.0 kPa (145.0 psi)
      8.5	281.3 kPa (40.8 psi)	1125.0 kPa (163.1 psi)
      9.0	312.5 kPa (45.3 psi)	1250.0 kPa (181.3 psi)
      9.5	343.8 kPa (49.8 psi)	1375.0 kPa (199.4 psi)
      10.0	375.0 kPa (54.4 psi)	1500.0 kPa (217.5 psi)
      10.5	406.3 kPa (58.9 psi)	1625.0 kPa (235.6 psi)
      11.0	437.5 kPa (63.4 psi)	1750.0 kPa (253.8 psi)
      11.5	468.8 kPa (68.0 psi)	1875.0 kPa (271.9 psi)
      12.0	500.0 kPa (72.5 psi)	2000.0 kPa (290.0 psi)
      12.5	531.3 kPa (77.0 psi)	2125.0 kPa (308.1 psi)
      13.0	562.5 kPa (81.6 psi)	2250.0 kPa (326.3 psi)
      13.5	593.8 kPa (86.1 psi)	2375.0 kPa (344.4 psi)
      14.0	625.5 kPa (90.6 psi)	2500.0 kPa (362.5 psi)
      14.5	656.3 kPa (95.2 psi)	2625.0 kPa (380.6 psi)
      15.0	687.5 kPa (99.7 psi)	2750.0 kPa (398.8 psi)
      15.5	718.8 kPa (104.2 psi)	2875.0 kPa (416.9 psi)
      16.0	750.0 kPa (108.8 psi)	3000.0 kPa (435.0 psi)
      16.5	781.3 kPa (113.3 psi)	3125.0 kPa (453.1 psi)
      17.0	812.5 kPa (117.8 psi)	3250.0 kPa (471.3 psi)
      17.5	843.8 kPa (122.3 psi)	3375.0 kPa (489.4 psi)
      18.0	875.0 kPa (126.9 psi)	3500.0 kPa (507.5 psi)
      18.5	906.3 kPa (131.4 psi)	3625.0 kPa (525.6 psi)
      19.0	937.5 kPa (135.9 psi)	3750.0 kPa (543.8 psi)
      19.5	968.8 kPa (140.5 psi)	3875.0 kPa (561.9 psi)
      20.0	1000.0 kPa (145.0 psi)	4000.0 kPa (580.0 psi)

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      ( 1 )	The pressures for the transducers that are not associated with the air starting system are in the column.
      ( 2 )	The pressures for the transducers that are associated with the air starting system are in the column.

      The results of the preceding procedure are in the following list:

      • The output corresponds to the desired pressure range. Stop.

      • The output does not correspond to the desired pressure range. Proceed to 3.

3. Calibrate the transducer. This assumes that the transducer is mounted on the engine.

   1. Turn the isolation valve on the transducer mounting. This isolates the transducer from the engine. An arrow on the valve indicates the direction of flow. See illustration 2.

   2. Apply a pressure that is equal to 4 mA to the transducer. See table 2. See the pressure port connection in illustration 2.

   3. Monitor the ammeter. Adjust the zero dial until the ammeter reads 4mA. See the location of the zero dial that is in illustration 1.

   4. Apply the pressure that is equal to 20mA to the transducer. See table 2. See the pressure port connection in illustration 2.

      Note: The full range of pressure may not be available. Use partial pressure. Use the highest possible pressure. This will yield the best accuracy. See table 1.

   5. Monitor the ammeter. Adjust the zero dial until the ammeter reads 20mA. See the location of the zero dial that is in illustration 1.

   6. Apply the pressure that is equal to 4mA to the transducer. Verify that the ammeter displays 4mA.

      The results of the preceding procedure are in the following list:

      • The output corresponds to the desired pressure range. The transducer is calibrated. Stop.

      • The output does not correspond to the desired pressure range. Proceed to 4.

4. Reapply the pressure.

   1. Apply the pressure that is equal to 4mA to the transducer. See table 2. See the pressure port connection in illustration 2.

   2. Monitor the ammeter. Adjust the zero dial until the ammeter reads 4mA. See the location of the zero dial that is in illustration 1.

   3. Apply the pressure that is equal to 20mA to the transducer. See table 2. See the pressure port connection in illustration 2.

      Note: The full range of pressure may not be available. Use partial pressure. Use the highest possible pressure. This will yield the best accuracy. See table 1.

   4. Monitor the ammeter. Adjust the zero dial until the ammeter reads 20mA. See the location of the zero dial that is in illustration 1.

   5. Apply the pressure that is equal to 4mA to the transducer. Verify that the ammeter displays 4mA.

      The results of the preceding procedure are in the following list:

      Note: Repeat the procedure several times in order to properly calibrate the transducer. Continue until the 4mA signal is correct and the 20mA signal is correct.

      • The output corresponds to the desired pressure range. The transducer is calibrated. Stop.

      • The output does not correspond to the desired pressure range. Replace the transducer. Verify that the repair resolves the problem. Stop.