BLADE AR 3596703 - Caterpillar

There is a strong electrical shock hazard when the crankshaft is rotating.Do not touch the wires that are associated with the ignition system when the engine is cranking or when the engine is running.
The air inlet, the cylinders, and the exhaust system can be filled with fuel when the gas supply is ON, the ignition system is disabled, and the engine is cranked. The unburned fuel can ignite unexpectedly and cause damage.Turn OFF the gas supply before you perform this step.
Set the engine control to the OFF/RESET position.
Disconnect the P2 ECM connector. Thoroughly inspect the J2 and P2 ECM connectors for corrosion, moisture, and other damage. Make repairs, if necessary.
Remove the wires for the suspect circuit from the P2 ECM connector. The location of the wiring for the suspect circuit depends on the original diagnostic code.Note: For identification of the terminal locations, refer to Illustrations 1, 2, and 3.
If you are troubleshooting a -6 code, remove the wire from the terminal location that is for the circuit driver of the suspect cylinder.
If you are troubleshooting a -5 code, remove the wires from the terminal locations that are for the circuit driver and from the return of the suspect cylinder. Fabricate a jumper wire that is long enough to create a test circuit across the P2 ECM connector. Crimp connector sockets to each end of the jumper wire. Install the ends of the jumper wire into the terminals for the removed wires.
Connect the P2 ECM connector. If any valve covers were removed, install the valve covers.
Set the engine control to the START position and observe the "Active Diagnostic" screen of Cat ET while you crank the engine.Expected Result:A -5 code is generated for the circuit after removal of the wire for the circuit driver.A -6 code is generated for the circuit with the installed jumper wire.Results:
OK - A diagnostic code was generated according to the test results.Repair: The ECM is operating correctly. There is a problem with the ignition harness. Set the engine control to the OFF/RESET position. Repair the harness, when possible. Replace the harness, if necessary.STOP
Not OK - A diagnostic code was not generated according to the results that are given above. There is a problem with the ECM.Repair: There may be a problem with the ECM. Temporarily install a new ECM. Refer to Troubleshooting, "Replacing the ECM".If the problem is resolved with the new ECM, install the original ECM and verify that the problem returns. If the new ECM operates correctly and the original ECM does not operate correctly, replace the ECM. Refer to Troubleshooting, "Replacing the ECM".STOPTest Step 8. Check the Ignition Transformer for a Short Circuit
Ignition systems can cause electrical shocks. Avoid contacting the ignition system components and wiring.Do not attempt to remove the valve covers when the engine is operating. The transformers are grounded to the valve covers. Personal injury or death may result and the ignition system will be damaged if the valve covers are removed during engine operation. The engine will