MANIFOLD (EXHAUST) 4L9151 - Caterpillar

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.
Test
Result: The "ARD Air System Service Test" passed.
Proceed to Test Step 12.
Result: The "ARD Air System Service Test" failed.
Repair: Replace the combustion air valve. Verify the repair by repeating the "ARD Air System Service Test". Proceed to Test Step 12.
7. Check the Voltage on the Combustion Air Valve Circuit
A. Turn the keyswitch to the OFF position.
B. Verify that the harness connector is free of debris, free of corrosion and securely connected.
C. Disconnect the combustion air valve from the wiring harness.
D. Turn the keyswitch to the ON position.
E. Verify that there is +5 VDC between the SUPPLY (terminal 1) and RETURN (terminal 2) on the combustion air valve wiring harness connector.
F. Turn the keyswitch OFF.
+5 VDC
Result: There is 5 VDC between the SUPPLY and RETURN on the combustion air valve connector.
Proceed to Test Step 8.
Result: There is not 5 VDC between the SUPPLY and RETURN on the combustion air valve connector.
There is a problem with the wiring harness or the A5:E2 aftertreatment controller.
Repair: Make the necessary repairs. Replace parts, if necessary.
Proceed to Test Step 12.
8. Create an Open at the Combustion Air Valve Connector
A. Turn the keyswitch OFF.
B. Disconnect the combustion air valve from the wiring harness.
C. Turn the keyswitch ON.
D. Monitor the diagnostic codes on Cat ET. Check for an active -3 diagnostic code for the combustion air valve.
E. Turn the keyswitch OFF.
Active -3 Code
Result: A -3 diagnostic code became active after disconnecting the combustion air valve.
Proceed to Test Step 9.
Result: A -3 diagnostic code did not become active after disconnecting the combustion air valve.
There is a problem with the wiring harness or the A5:E2 aftertreatment controller.
Repair: Make the necessary repairs. Replace parts, if necessary.
Proceed to Test Step 12.
9. Create a Short at the Sensor Connector
A. Turn the keyswitch OFF.
B. Create a