73813A 1 Mercruiser END CAP, EXHAUST MANIFOLD (REAR)

Table 1
Diagnostic Codes    
CDL Code     J1939 Code     Code Description
(code descriptions may vary)     Comments    
3239-5     2813-5     Air Shutoff Relay : Current Below Normal     The code is logged.    
3239-6     2813-6     Air Shutoff Relay : Current Above Normal     The code is logged.    
Follow the troubleshooting procedure in order to identify the root cause of the problem.    
Illustration 1 g02176233
Typical schematic diagramNote: The "Air Shutoff" parameter must be set to "Enabled" in order for the ECM to energize the air shutoff solenoid.
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 3239-5, 3239-6, 2813-5 or a 2813-6 code is active or logged.
Proceed to Test Step 11.
Result: A 3239-5, 3239-6, 2813-5 or a 2813-6 code is not active or logged.
Proceed to Test Step 2.
   
2. Perform the "Air Inlet Shutoff System Control Test"
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 System Control Test" in the "Diagnostic Tests" under the "Diagnostics" menu on 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 System Control Test" 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. Monitor the status for the air inlet shutoff switch while the switch is depressed.
   
Switch works correctly    
Result: The switch is operating correctly.
Return to service.
Result: The switch is not operating correctly.
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. Monitor the status for the air inlet shutoff switch while the two wires from the switch are connected.
   
The circuit is OK    
Result: The indications are correct. 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 indications are not correct. 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 Interlock for the Air Inlet Shutoff
A. Verify that P1-62 is connected to the +Battery.
J1/P1-62 is used for the transmission neutral switch. If a transmission neutral switch is installed, the transmission must be in neutral.
B. Remove the air inlet shutoff switch.
C. Turn the key switch to the ON position.
D. Monitor the status for the air inlet shutoff switch while the two wires from the switch are connected.
   
P1-62 is connected to the +Battery.    
Result: P1-62 is connected to the +Battery.
Check the status for the "Transmission Neutral Switch" while the transmission is in neutral. The status should be "On". If the status is "Off", refer to Troubleshooting, "Neutral Switch Circuit - Test".
Proceed to Test Step 6.
Result: P1-62 is not connected to the +Battery.
Connect P1-62 to the +Battery. Repeat Test Step 2.
   
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.
   
Illustration 2 g00850138
Typical air inlet shutoff solenoid
Table 3
Troubleshooting Test Steps    Values    Results    
7. Check the Supply Voltage to the Air Inlet Shutoff Solenoid
A. Turn the key switch to the ON position.
B. Access the "Air Inlet Shutoff Relay Output" test on Cat ET.
C. Measure the voltage across the two terminals of the air inlet shutoff solenoid.
D. Activate the "Air Inlet Shutoff Relay Output" test.
The output for the air inlet shutoff will be active for one second.
   
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. Turn the key switch to the ON position.
B. Access the "Air Inlet Shutoff Relay Output" test on Cat ET.
C. Measure the voltage across the relay solenoid.
The output for the air inlet shutoff system will be active for only one second.
D. Activate the "Air Inlet Shutoff