C13 Industrial Engine Caterpillar

Air Shutoff - Test

Usage:

C13 JR9

Use this procedure to troubleshoot the following codes or if the air shutoff system is not operating properly.

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Table 1
Diagnostic Codes
J1939 Code	Code Description (code descriptions may vary)	Comments
2813-5	Engine Air Shutoff Command Status : Current Below Normal	The code is logged.
2813-6	Engine Air Shutoff Command Status : Current Above Normal	The code is logged.
3667-2	Engine Air Shutoff Status : Erratic, Intermittent, or Incorrect	The inlet air shutoff valve switch has been used, but the inlet air shutoff valve feature is set as "Disabled" in the configuration parameters.
3667-31	Engine Air Shutoff Status	The engine air shutoff valve has been activated. The engine was shut down and injection is disabled. Perform a key cycle and reset the air inlet shutoff system.
Follow the troubleshooting procedure in order to identify the root cause of the problem.

Note: The "Air Shutoff" parameter must be set to "Enabled" in order for the ECM to energize the air shutoff solenoid.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Check for Diagnostic Trouble Codes A. Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Determine if a code is active or logged.	Diagnostic code	Result: A 3667-31 code is active or logged, or the air inlet shutoff valve is not working properly. Proceed to Test Step 2. Result: A 2813-5 code is active or logged. Proceed to Test Step 11. Result: A 2813-6 code is active or logged. Proceed to Test Step 12. Result: A 3667-2 code is active or logged. Proceed to Test Step 13.
2. Perform the "Air Inlet Shutoff Override" A. Turn the key switch to the OFF position. B. Connect Cat ET to the service tool connector. C. Turn the key switch to the ON position. D. Place the transmission in neutral. If the engine will not start, check the air inlet valve to ensure that the valve is not stuck closed. E. Start the engine. Increase the engine speed to 1500 rpm ± 100 rpm. F. Access the "Air Inlet Shutoff Override" in the "Diagnostic Tests" under the "Diagnostics" menu in Cat ET. G. Start the test. H. Wait for the engine to stop. I. Stop the test.	Test was successful	Result: The engine is shut down when the "Air Inlet Shutoff Override" is activated. The air inlet shutoff is working correctly. Reset the air inlet shutoff system. Proceed to Test Step 3. Result: The engine did not shut down. Proceed to Test Step 5.
3. Check the Air Inlet Shutoff Switch A. Turn the key switch to the ON position. B. Connect Cat ET to the service tool connector. C. Use Cat ET to monitor the status for the air inlet shutoff switch while the switch is depressed.	Switch works correctly	Result: The status of the switch changed in Cat ET. The inlet air shutoff switch is operating properly. Return to service. Result: The status of the switch did not change in Cat ET. Proceed to Test Step 4.
4. Check the Circuit to the Air Inlet Shutoff Switch A. Turn the key switch to the OFF position. B. Remove the air inlet shutoff switch. C. Turn the key switch to the ON position. D. Connect Cat ET to the service tool connector. E. Short the terminals of the air inlet shutoff switch together. This will simulate the switch being closed. F. Use Cat ET to monitor the status for the air inlet shutoff switch while the short is in place.	The circuit is OK	Result: The status changed in Cat ET. The wiring is OK. The switch is not working properly. Replace the air inlet shutoff switch. Verify that the repair eliminates the problem. Result: The status did not change in Cat ET. There is a problem with the wiring between the ECM and the air inlet shutoff switch. Inspect the wiring between the ECM and the air inlet shutoff switch. Repair the wiring or replace the wiring. Verify that the repair eliminates the problem.
5. Check the Transmission Neutral Switch A. Verify that the transmission neutral switch is wired correctly. If a transmission neutral switch is installed, the transmission must be in neutral. B. Turn the key switch to the ON position. C. Connect Cat ET to the service tool connector. D. Monitor the status for the "Transmission Neutral Switch" while the transmission is in neutral. The status should be ON.	Transmission Neutral Switch	Result: The status of the transmission neutral switch is ON. Proceed to Test Step 6. Result: The status of the transmission neutral switch is OFF. Refer to Troubleshooting, "Neutral Switch Circuit - Test".
6. Inspect Electrical Connectors and Wiring A. Turn the key switch to the OFF position. B. Thoroughly inspect the J2/P2 ECM connector and all other connectors in the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details. C. Perform a 45 N (10 lb) pull test on the wires that are associated with the air inlet shutoff system. D. Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details. E. Check the harness and wiring for abrasion and for pinch points from the components back to the ECM.	Connectors are OK	Result: All the wires and connections are OK. Proceed to Test Step 7. Result: There is a problem with the wiring. Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are coupled. Verify that the repair eliminates the problem.

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Illustration 1	g00850138
Typical air inlet shutoff solenoid

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Table 3
Troubleshooting Test Steps	Values	Results
7. Check the Supply Voltage to the Air Inlet Shutoff Solenoid A. Connect Cat ET to the service tool connector. B. Turn the key switch to the ON position. B. Perform the "Air Inlet Shutoff Override" test in Cat ET. C. Measure the voltage across the two terminals of the air inlet shutoff solenoid.	The voltage is within ±5 VDC of battery voltage	Result:The voltage is within ±5 VDC of battery voltage when the test is active. The ECM is properly controlling the relay for the air inlet shutoff solenoid, but the air inlet shutoff solenoid is not working. Replace the air inlet shutoff solenoid. Verify that the repair eliminates the problem. Result: The voltage is not within ±5 VDC of battery voltage when the test is active. The air inlet shutoff solenoid is not receiving the correct signal. Proceed to Test Step 8.
8. Check the Signal Voltage to the Relay A. Connect Cat ET to the service tool connector. B. Turn the key switch to the ON position. C. Perform the "Air Inlet Shutoff Override" test in Cat ET. D. Measure the voltage across the relay coil.	The voltage is within ±5 VDC of battery voltage	Result: The voltage is within ±5 VDC of battery voltage when the test is active. The relay is receiving the signal from the ECM. Proceed to Test Step 9. Result: The voltage is not within ±5 VDC of battery voltage when the test is active. The relay is not receiving the signal from the ECM. Proceed to Test Step 11.
9. Check the Power Supply to the Relay A. Measure the voltage between the +Battery terminal of the relay and the engine ground.	The voltage is within ±5 VDC of battery voltage	Result: The voltage is within ±5 VDC of battery voltage. The relay is receiving power. Proceed to Test Step 10. Result: The voltage is not within ±5 VDC of battery voltage. There is a problem in the wiring between the relay and the +Battery terminal. Repair or replace the wiring harness. Verify that the repair eliminates the problem.
10. Check the Output Voltage of the Relay A. Ensure that all of the circuits connectors are connected. B. Turn the key switch to the ON position. C. Perform the "Air Inlet Shutoff Override" test in Cat ET. D. Measure the voltage from the output terminal on the relay to the engine ground.	The voltage is within ±5 VDC of battery voltage	Result: The voltage is within ±5 VDC of battery voltage. There is a problem in the wiring between the relay and the air inlet shutoff solenoid. Repair or replace the wiring harness. Verify that the repair eliminates the problem. Result: The voltage is not within ±5 VDC of battery voltage. The relay is not sending power to the air inlet shutoff solenoid. Replace the relay for the air inlet shutoff. Verify that the repair eliminates the problem.
11. Check the Wiring for an Open Circuit A. Turn the keyswitch to the OFF position for 2 minutes. The keyswitch must be off for two minutes to allow the DEF pump to purge, to reset the code, and to reset the DCU. B. Disconnect the air inlet shutoff relay from the wiring harness. Verify that the harness connector is free of debris, free of corrosion, and securely connected. C. Connect a jumper wire between the terminals of the harness connector for the relay coil. The coil is replaced with a short circuit. D. Turn the key switch to the ON position. E. Connect to Cat ET. F. Perform the "Air Inlet Shutoff Override" test in Cat ET.	Short circuit	Result: A -5 code became active during the test. The ECM did not detect the jumper wire. An open circuit in the wiring harness has been detected. Repair or replace the wiring harness. Perform the "Air Inlet Shutoff Override" test again to verify that the problem is resolved. Result: A -6 code became active during the test. The ECM detected the jumper wire. A failed relay has been detected. Replace the air inlet shutoff relay. Perform the "Air Inlet Shutoff Override" test again to verify that the problem is resolved.
12. Check the Wiring for a Short Circuit A. Turn the keyswitch to the OFF position for 2 minutes. The keyswitch must be off for two minutes to allow the DEF pump to purge, to reset the code, and to reset the DCU. B. Disconnect the air inlet shutoff relay from the wiring harness. Verify that the harness connector is free of debris, free of corrosion, and securely connected. C. Turn the key switch to the ON position. D. Connect to Cat ET. E. Perform the "Air Inlet Shutoff Override" test in Cat ET.	Open circuit	Result: A -6 code became active during the test. The ECM did not detect the open circuit. A short circuit in the wiring harness has been detected. Repair or replace the wiring harness. Perform the "Air Inlet Shutoff Override" test again to verify that the problem is resolved. Result: A -5 code became active during the test. The ECM detected the open circuit. A failed relay has been detected. Replace the air inlet shutoff relay. Perform the "Air Inlet Shutoff Override" test again to verify that the problem is resolved.
13. Check the Configuration Parameters A. Turn the key switch to the ON position. B. Connect to Cat ET and navigate to the "Configuration Tools" screen. C. Check the status of the "Inlet Air Shutoff Valve" in the "Engine Configuration Parameters" menu.	"Inlet Air Shutoff Valve" feature is "Disabled"	Result: The "Inlet Air Shutoff Valve" feature is "Disabled" and a switch is installed. Change the configuration parameter to "Enabled". Return the unit to service.