HEAD AS 1524192 - Caterpillar

Perform a 45 N (10 lb) pull test on each of the wires that are associated with the IAPCV.
Check the torque of the allen head screws for each of the ECM connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasion and for pinch points from the IAPCV back to the ECM.Note: Ensure that the seal is installed on the harness connector for the injection actuation pressure control valve.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and the wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or the wiring.Repair: 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 completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
Restore the electrical power to the ECM.
Start the engine.
Observe the "Active Diagnostic" screen on Cat ET. Wait at least 30 seconds so that any codes may become active. Look for the code that is 05 or 06.Expected Result:One of the above codes is active.Results:
Active code - One of the above codes is active. There is a problem in the electrical circuit for the IAPCV. Proceed to Test Step 3.
No active codes - Neither of the above codes are active.Repair: If one of the above codes is logged and the engine is not running properly, refer to Troubleshooting, "Symptom Troubleshooting".If the engine is running properly at this time, there may be an intermittent problem in a harness or in an electrical connector that is causing the codes to be logged. Refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to troubleshooting intermittent electrical problems.STOPTest Step 3. Measure the Resistance of the Injection Actuation Pressure Control Valve's Solenoid
Remove the electrical power from the ECM.
Disconnect the connectors for the IAPCV at the injection pump.Note: Ensure that the seal on the connector for the IAPCV remains on the connector when the connector is disconnected.
Measure the resistance between terminals 1 on the IAPCV. Record the value of the resistance measurement.Expected Result:The resistance measurement is between 6.5 and 10.5 Ohms.Results:
OK - The resistance measurement is between 6.5 and 10.5 Ohms. The IAPCV appears to be OK. Connect the connectors for the IAPCV. Proceed to Test Step 4.
Not OK - The resistance measurement is not between 6.5 and 10.5 Ohms. The solenoid's resistance is not within the specification.Repair: Replace the unit injector hydraulic pump. Verify that the problem is resolved.STOPTest Step 4. Check the Harness for an Open Circuit
Remove the electrical power from the ECM.
Disconnect the J2/P2 connectors.
Measure the resistance between terminal locations P2-20 and P2-10 at the ECM connector.Expected Result:The resistance measurement is within two Ohms of