BLOCK 8E8648 - Caterpillar

Table 1 lists the diagnostic codes that relate to the combustion air system.
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: