SEAL 1625517 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the system when a 42-11 Injection Actuation Pressure output fault is active.Note: If a 164-11 Injection Actuation Pressure system fault is active, refer to Troubleshooting, "Injection Actuation Pressure - Test".The Engine Control Module (ECM) controls the operation of the high-pressure oil pump by sending a signal to the injection actuation pressure control valve (IAPCV). The ECM uses the input signals from these sensors in order to calculate the control signal for the IAPCV: engine speed/timing sensor, throttle position sensor and injection actuation pressure sensor. The IAPCV is located inside the high-pressure oil pump. The IAPCV cannot be serviced separately.The IAPCV uses the signal from the ECM to control the output pressure of the high-pressure pump. The ECM sends an increase in current flow to the IAPCV in order to increase the output pressure of the high-pressure oil pump. If the IAPCV connector is unplugged at the pump, the pressure output drops to the minimal output.high-pressure oil is produced by the high-pressure oil pump. The high-pressure oil is directed to the injectors through the high-pressure oil manifold. The injection actuation pressure sensor is used to detect the pressure of the oil that is in the high-pressure oil manifold. The sensor is installed in the oil manifold that is in the cylinder head on the left side of the engine. The high-pressure oil is used to actuate the Hydraulic Electronic Unit Injectors (HEUI).
Illustration 1 g01157164
Schematic for the injection actuation pressure control valveTest Step 1. Check for Active Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the data link connector.
Start the engine.
Check for active diagnostic codes on Cat ET.Note: Wait at least 15 seconds in order for the diagnostic codes to become active.Expected Result:There are no active diagnostic codes.Results:
OK - There are no active diagnostic codes.Repair: The problem seems to be resolved at this time. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect"..STOP
Not OK - A 42-11 diagnostic code is active. Proceed to Test Step 2.Test Step 2. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Illustration 2 g01157054
Left side engine view (typical example) (1) J500/P500 Injection actuation pressure control valve connector (2) Injection actuation pressure sensor (3) J2/P2 ECM connector
Thoroughly inspect connectors (1) and (3) . Also, thoroughly inspect the connector for sensor (3) . Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 3 g01151730
Pin locations on ECM connector (P2-61) IAP control valve (P2-62) Sensor return
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the IAPCV.
Check the allen head screw for the ECM connectors for the proper torque. 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.Expected Result:All connectors, pins, and sockets are coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors