SPROCKET-TRACK 8E4686 - Caterpillar

System Operation Description:Note: Valid only if engine is equipped with an intake valve actuator.Use this procedure to troubleshoot any suspect problems with the intake valve actuators.Use this procedure for the following diagnostic codes:
285-05 Intake Valve Actuator #1 current low
285-06 Intake Valve Actuator #1 current high
286-05 Intake Valve Actuator #2 current low
286-06 Intake Valve Actuator #2 current high
287-05 Intake Valve Actuator #3 current low
287-06 Intake Valve Actuator #3 current high
288-05 Intake Valve Actuator #4 current low
288-06 Intake Valve Actuator #4 current high
289-05 Intake Valve Actuator #5 current low
289-06 Intake Valve Actuator #5 current high
290-05 Intake Valve Actuator #6 current low
290-06 Intake Valve Actuator #6 current high
You have been directed to this procedure from Troubleshooting, "Troubleshooting without a Diagnostic Code".The intake valve actuators are used to hold down the rocker arms. This prevents the intake valves from closing. The intake valve actuator is a hydraulic system that uses the engine oil to operate. Oil is allowed to flow in and out of the intake valve actuator when the intake valve actuator is not activated. The intake valve actuator is activated by an electric solenoid. When the solenoid is energized the intake valve actuator traps the oil. This allows the actuator to hold the rocker arm down."Intake Valve Actuator Solenoid Test"The "Intake Valve Actuator Solenoid Test" is a diagnostic test that is available on the Caterpillar Electronic Technician (ET). The test helps diagnose problems with the solenoid for the intake valve actuator. A small current is applied to the circuit at all times. This allows the Engine Control Module (ECM) to detect open circuits when the valve is not actuated. A short circuit will only be detected when the valve is actuated.The following conditions must be met before the "Intake Valve Actuator Solenoid Test" will function:
Engine speed is 0.
Vehicle speed is 0.
The neutral switch is in the Neutral position.
Illustration 1 g01099822
C15 schematic
Illustration 2 g01099820
P2 ECM connector
(P2-53) "Actuator 5 & 6 supply"
(P2-61) "Actuator 3 & 4 supply"
(P2-77) "Actuator 1 & 2 supply"
(P2-100) "Actuator 6 return"
(P2-101) "Actuator 3 return"
(P2-102) "Actuator 5 return"
(P2-103) "Actuator 4 return"
(P2-111) "Actuator 1 return"
(P2-113) "Actuator 2 return"
Illustration 3 g01099864
Valve cover connectors for C15 engines
(1) Terminal 9 Actuator 1 & 2 supply
(2) Terminal 8 Actuator 2 return
(3) Terminal 7 Actuator 1 return
(4) Terminal 11 Actuator 5 & 6 supply
(5) Terminal 10 Actuator 3 & 4 supply
(6) Terminal 9 Actuator 6 return
(7) Terminal 8 Actuator 5 return
(8) Terminal 7 Actuator 4 return
(9) Terminal 6 Actuator 3 return
Illustration 4 g01105906
Location of components
(1) Check valve
(2) Acuator solenoid
(3) Face seals
(4) Intake valve actuation pressure sensor
(5) Intake valve actuation pressure solenoid Test Step 1. Inspect Electrical Connectors and Wiring
Thoroughly inspect the J2/P2 ECM connector and the front valve cover connector. Thoroughly inspect the valve cover connectors for the intake valve actuators.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector for the solenoids for the intake valve actuators.
Check the ECM connector (allen head screw) for the proper torque of 6 N m (55.0 lb in).
Check the harness and wiring for abrasion and