0581112 JOHNSON LEAD ASSY., Ignition swith to horn

Recommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
A. Establish communication between the electronic service tool and the Electronic Control Module (ECM). Refer to Troubleshooting, "Electronic Service Tools", if necessary.
Diagnostic codes
Result: There are active codes.
Repair: Troubleshoot any active codes before continuing with this procedure.
Result: There are no active codes.
Proceed to Test Step 2.
2. Electrical Connections
A. Check for the correct installation of the ECM P1 and P2 connectors. Check for correct installation of the fuel injector connectors.
Connectors
Result: There are suspect connectors.
Repair: Repair connectors that are suspect or replace connectors that are suspect.
Perform the "Wiggle Test" on the electronic service tool
Result: There are no suspect connectors.
Proceed to Test Step 3.
3. Fuel Quality
A. Obtain a fuel analysis to confirm that the correct fuel is being used for the engine. Refer to Systems Operation/Testing and Adjusting, "Fuel System Quality Test" for the proper procedure.
Fuel
Result: The fuel quality is not OK.
Note: Refer to Operation and Maintenance Manual for information on the proper characteristics of the fuel for the engine. If necessary,
Repair: Replace the fuel. Verify that the repair eliminated the noise.
Result: The fuel quality is OK.
Proceed to Test Step 4.
4. Correct Lubrication
A. Check for correct lubrication of the valve components. Check for sufficient lubrication between the injector tappets and the rocker arms.
B. Check for blocked oil passages. Oil passages must be clean. Clean any oil passages that are questionable. Refer to the Disassembly and Assembly for additional information.
C. Inspect the engine oil filters for ferrous material.
D. Obtain an oil analysis. The analysis will contribute to a better understanding of oil contamination and the origin of the contamination.
Lubrication
Result: The oil passages are blocked or the engine does not have correct lubrication.
Repair: Make the necessary repairs, Verify that the repair eliminated the noise.
Result: The oil passages are not blocked and the engine has proper lubrication.
Proceed to Test Step 5.
5. Engine Accessories
A. Attempt to isolate the source of the noise.
Engine accessory
Result An engine accessory is the source of the noise.
Repair: Repair the engine accessory and/or replace the engine accessory, as necessary.
Result An engine accessory is not the source of the noise.
Proceed to Test Step 6.
6. Valve Train Components
A. Check the valve lash. Refer to Systems Operation, Testing, and Adjusting, "Valve Lash - Inspect/Adjust".
B. Check for damage to valve train components. Remove the valve cover. Check the following items for damage:
Camshaft
Valve springs
Camshaft followers
Rocker shaft
Pushrods
Refer to the Disassembly and Assembly for additional information.
C. Check for valves that do not move freely. If necessary, remove the cylinder head and inspect the valves.
Refer to the Disassembly and Assembly for additional information.
Valve train
Result: The valve train components are damaged.
Repair: Make the necessary repairs, Verify that the repair eliminated the noise.
Result: The valve train components are not damaged.
Proceed to Test Step 7.
7. Gear Train and Components of the Lower End
A. Inspect the gear train and lower end components.
Gear train
Result: The gear train or lower end components are damaged.
Repair: Replace any damaged parts.
Result: The gear train or lower end components are not damaged.
Proceed to Test Step 8.
8. Crankshaft
A. Inspect the crankshaft and the related components. Look for worn thrust plates and wear on the crankshaft.
B. Inspect the connecting rod bearings and the bearing surfaces on the crankshaft. Make sure that the bearings are in the correct position.
Crankshaft
Result: The crankshaft or the related components are damaged or worn.
Repair: Repair or replace any damaged parts. Verify that the repair eliminated the noise.
Result: The crankshaft or the related components are not damaged or worn.
Contact the Dealer Solution Network (DSN).