STEM-ELEVATOR 5J8893 - Caterpillar

Table 1
Diagnostic Trouble Codes
J1939 Code CDL Code Description Comments
3837-17 E1170 (1) Low Aftertreatment #1 Secondary Air Pressure Air pressure to the combustion air valve is low.
Follow the troubleshooting procedure to identify the root cause of the problem. System OperationNote: The technician must perform an "ARD Air System Service Test" to verify that the problem is corrected. If the problem has been resolved, perform a manual DPF regeneration before the unit is returned to service.The ECM is responsible for the control of many components on the CEM, including the combustion air valve. The ECM receives inputs from the sensors on the CEM. The ECM uses these inputs to determine when and what position the combustion air valve should be opened.When the ECM determines that the combustion air valve should be opened, the ECM sends a pulse width modulated (PWM) signal to the valve. This PWM signal causes the valve to open. A position sensor located in the combustion air valve assembly then sends a signal back to the ECM showing the actual position of the valve.
Table 2
Associated Diagnostic Trouble Codes
J1939 Code CDL Code
102-18 E1045 (2)
3473-31 E1025 (2)
3474-31 E1026 (2)
3711-31 E593 (2) Complete the procedure in the order in which the steps are listed.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Associated Diagnostic Trouble Codes
A. Connect the electronic service tool to the diagnostic connector.
B. Determine if an associated diagnostic code is present.
Code
Result: An associated diagnostic trouble code is not present.
Proceed to Test Step 2.
Result: An associated diagnostic trouble code is present.
Repair: Troubleshoot the associated code.
If the repair does not eliminate the problem, proceed to Test Step 2.
2. Inspect the Piping Between the Compressor and the ATAAC
A. Visually Inspect the piping between the compressor and the ATAAC.
B. Check for cracks in the piping.
C. Check for loose hardware or damaged hardware.
Piping
Result: The piping is damaged or cracked.
Repair: Replace the piping or repair the piping. Proceed to Test Step 6.
Result: The piping is not damaged or cracked.
Proceed to Test Step 3.
3. Inspect the Piping Between the Compressor and the Air Valve
A. Inspect the piping (1) between the compressor and the air valve.
B. Check for cracks in the piping.
C. Check for loose hardware or damaged hardware.
Damaged or cracked piping
Result: The piping is damaged or cracked.
Repair: Replace the piping or repair the piping. Proceed to Test Step 6.
Result: The piping is not damaged or cracked.
Proceed to Test Step 4.
Illustration 1 g06125577
CEM (typical)
Some parts have been deleted for clarity.
(1) Clamps
(2) Piping between the combustion air valve and the pressure sensor
Table 4
Troubleshooting Test Steps Values Results
4. Inspect the Piping from the Combustion Air Valve to the Pressure Sensor
A. Inspect piping (2) from the combustion air valve to the pressure sensor.
B. Check for air leaks.
C. Check for loose hardware or damaged hardware.
D. Check clamps (1) on the piping. Make sure that the clamps are tight.
Piping
Result: The piping is damaged or cracked.
Repair: Replace the piping or repair the piping. Proceed to Test Step 6.
Result: The piping is not damaged or cracked.
Proceed to Test Step 5.
5. Inspect the Turbochargers
A. Refer to