HOSE ASSEM. 5S5840 - Caterpillar

Use this procedure to troubleshoot any suspect problems with the Injection Actuation Pressure Control Valve (IAPCV). This procedure covers the following diagnostic codes:
42-05 Injector Actuation Valve open circuit
42-06 Injector Actuation Valve short to groundNote: Do not use this procedure to troubleshoot an active 164-11 Injector Actuation Pressure system fault, unless you have been directed to this procedure from another section of this document.The IAPCV is internal to the unit injector hydraulic pump. The IAPCV is a precision displacement control actuator. This actuator changes the pump outlet flow that is based on the control current that is supplied by the Electronic Control Module (ECM). The variable displacement unit injector hydraulic pump pressurizes only the amount of high-pressure oil that is needed. The ECM software contains performance maps. The performance maps have a desired actuation pressure for every engine operating condition. The ECM sends a control current to the IAPCV. This signal creates an actual actuation pressure that matches the desired actuation pressure. If the actual actuation pressure does not match the desired actuation pressure, the ECM will increase the control current or the ECM will decrease the control current to the IAPCV in order to adjust pump outlet flow. The following problems can cause a 42-05 diagnostic code:
An open circuit in the wiring
An open circuit in the IAPCV
A short to ground on the return wireThe following problems can cause a 42-06 diagnostic code:
The control wire has a short to the +Battery.
The return wire has a short to the +Battery.
A short circuit in the IAPCV
A short to ground on the control wire
Illustration 1 g01121315
Schematic for the injection actuation pressure control valve
Illustration 2 g01121264
Left side view
(1) Connector for the IAPCV
(2) J2/P2 connectors
Illustration 3 g01121316
P2 terminations for the IAPCV
(P2-10) Control
(P2-20) Return
Table 1
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect connectors (1) and (2). Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the IAPCV.
D. Check the allen head screw on the ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect".
E. 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.
Electrical Connectors and Wiring
Results: The connectors and the wiring are OK. Proceed to Test Step 2.
Results: 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 coupled. Verify that the repair eliminates the problem.
STOP
2. Check for Codes
A. Connect the Cat® Electronic Technician (ET) to the service tool connector.
B. Observe the "Active Diagnostic" screen on Cat ET. Wait at least 15 seconds so that any codes may become active. Look for these codes:
42-05
42-06
Codes
Results: One of the codes is active. Proceed to Test Step