0384714 JOHNSON BEARING HOUSING ASSY.

Table 1
J1939 Code and Description CDL Code and Description Comments
3487-5
ARD Air Pressure Control Actuator : Current Below Normal 2489-5
ARD Air Pressure Control Actuator : Current Below Normal There is low current flow in the wiring between the combustion air valve and the A5:E2 aftertreatment controller. Regenerations are disabled. The code is logged.
3487-6
ARD Air Pressure Control Actuator : Current Above Normal 2489-6
ARD Air Pressure Control Actuator : Current Above Normal There is excessive current flow in the wiring between the combustion air valve and the A5:E2 aftertreatment controller. Regenerations are disabled. The code is logged.
3487-7
ARD Air Pressure Control Actuator : Not Responding Properly E1041 (1)
ARD Air Pressure Control Actuator : Not Responding Properly The combustion air valve is not responding properly to commands from the A5:E2 aftertreatment controller. The code is logged.
3488-3
ARD Air Pressure Control Actuator Position Sensor : Voltage Above Normal 2490-3
ARD Air Pressure Control Actuator Position Sensor : Voltage Above Normal There is excessive voltage on the signal wire between the combustion air valve and the A5:E2 aftertreatment controller or there is an open circuit on the supply, signal, or return wire. The code is logged. Engine power is derated.
3488-4
ARD Air Pressure Control Actuator Position Sensor : Voltage Below Normal 2490-4
ARD Air Pressure Control Actuator Position Sensor : Voltage Below Normal There is low voltage on the signal wire between the combustion air valve and the A5:E2 aftertreatment controller. The code is logged. Engine power is derated.
Illustration 1 g03566207Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Determine the Diagnostic Code
A. Establish communication between Cat® Electronic Technician (ET) and the "Engine #1 Aftertreatment Controller". Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Record the logged codes or the active codes.
Diagnostic Code
Result: A E1041 (1) or a 3487-7 code is logged or active.
Proceed to Test Step 2.
Result: A 2490-3, 2490-4, 3488-3 or a 3488-4 code is logged or active. There is a problem with the wiring between the A5:E2 aftertreatment controller and the combustion air valve.
Proceed to Test Step 7.
Result: A 2489-6 or a 3487-6 code is logged or active. There is a problem with the wiring between the A5:E2 aftertreatment controller and the combustion air valve.
Proceed to Test Step 10.
Result: A 2489-5, or a 3487-5 code is logged or active. There is a problem with the wiring between the A5:E2 aftertreatment controller and the combustion air valve.
Proceed to Test Step 11.
Table 3
Troubleshooting Test Steps Values Results
2. Inspect the Wiring to the Actuator
A. Inspect the wiring from the A5:E2 aftertreatment controller to the actuator for the combustion air.
B. Check all connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Check the wires for damage to the insulation.
D. Inspect the wires for the following conditions:
1. Exposed insulation
2. Rubbing of a wire against the engine
3. Rubbing of a wire against a sharp point
E. Perform a pull test on each wire terminal connection. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Damaged Wire or Connector
Result: A damaged wire or damaged connector was not found.
Proceed to Test Step 3.
Result: A damaged wire or damaged connector was found.
Repair: Repair the damaged wire or the damaged connector. Proceed to Test Step 3.
3. Perform the "ARD Air System Service Test"
A. Perform the "ARD Air System Service Test" in Cat ET.
Test
Result: The "ARD Air System Service Test" passed.
Proceed to Test Step 12
Result: The "ARD Air System Service Test" failed.
Proceed to Test Step 4.
Illustration 2 g03766377
(1) Inspection points between the compressed air supply and the ARD head
Table 4
Troubleshooting Test Steps Values Results
4. Inspect the Piping Between the Compressor and the Combustion Air Valve
A.Inspect the tube between the compressor and the combustion air valve.
B. Check for cracks in the tubing.
C. Check for loose hardware or damaged hardware.
Damaged Tubing
Result: The tube is damaged or cracked.
Repair: Replace the tubing or repair the tubing. Proceed to Test Step 6.
Result: The tube is not damaged or cracked.
Proceed to Test Step 5.
Illustration 3 g03766406
CEM (typical)
(2) Piping between the combustion air valve and the combustion air absolute pressure sensor
(3) Clamps
Table 5
Troubleshooting Test Steps Values Results
5. Inspect the Tubing from the Combustion Air Valve to the Combustion Air Absolute Pressure Sensor
A. Inspect the tubing from the combustion air valve to the combustion air absolute pressure sensor.
B. Check for cracks in the tubing.
C. Check for air leaks.
D. Check the clamps on the tube. Make sure that the clamps are tight.
Damaged Tubing
Result: The tube is damaged or cracked.
Repair: Replace the tubing or repair the tubing. Proceed to Test Step 6.
Result: The tube is not damaged.
Repair: Replace the combustion air valve. Proceed to Test Step 6.
6. Perform the "ARD Air System Service Test"
A. Perform the "ARD Air System Service Test" in Cat ET.
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