C13 and C15 Engines for Combat and Tactical Vehicles Caterpillar

Note: Valid only if engine is equipped with an intake valve actuator.

Use this procedure to troubleshoot any suspect problems with the circuit for the intake valve actuator pressure solenoid.

This procedure covers the following diagnostic codes:

• 283-05 Intake Valve Actuation System Oil Pressure Solenoid current low

• 283-06 Intake Valve Actuation System Oil Pressure Solenoid current high

"Intake Valve Actuator Pressure Solenoid Test"

The "intake valve actuator pressure solenoid Test" is a diagnostic test that is available on Caterpillar Electronic Technician (ET). The test helps diagnose problems with the intake valve actuator pressure solenoid. 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 pressure solenoid Test" will function:

• Engine speed is 0.

• Vehicle speed is 0.

• The neutral switch is in the Neutral position.

Illustration 1	g01099622
Schematic

Illustration 2	g01099625
P2 ECM connector (P2-3) Intake valve actuator pressure solenoid (P2-79) Solenoid common

Illustration 3	g01104080
Location of components (1) Intake valve actuator pressure solenoid

Test Step 1. Inspect Electrical Connectors and Wiring

1. Turn the key switch to the OFF position.

2. Thoroughly inspect the J2/P2 ECM connector and the solenoid connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.

3. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the solenoid connector.

4. Check the ECM connector (allen head screw) for the proper torque of 6 N·m (55.0 lb in).

5. Check the harness and wiring for abrasion and for pinch points.

Expected Result:

All connectors, pins, and sockets are completely coupled and/or inserted and the harness and the wiring are free of corrosion, of abrasion, or of pinch points.

Results:

• OK - The harness and wiring are OK. Proceed to Test Step 2.

• Not OK - There is a problem in the connectors and/or 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.

  STOP

Test Step 2. Check for Active Diagnostic Codes

1. Connect the Cat ET to the service tool connector.

2. Turn the key switch to the ON position.

3. Check for active diagnostic codes that are related to the intake valve actuator pressure solenoid.

4. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.

   Note: Wait at least 15 seconds in order for the diagnostic codes to become active.

5. Determine if the problem is related to the low current diagnostic code 05 or the high current diagnostic code 06.

Expected Result:

No diagnostic codes are active.

Results:

• OK - No diagnostic codes are active.

  Repair: The problem may have been related to a faulty connection in the harness. Carefully reinspect the connectors and wiring. Refer to Troubleshooting, "Electrical Connectors - Inspect".

  STOP

• Not OK - A low current diagnostic code (05) is active at this time. Proceed to Test Step 3.

• Not OK - A high current diagnostic code (06) is active at this time. Proceed to Test Step 5.

Test Step 3. Short the Wires at the Solenoid

1. Turn the key switch to the OFF position.

2. Disconnect the intake valve actuator pressure solenoid at the solenoid connector.

3. Fabricate a jumper wire to short terminal 1 and terminal 2 of the connector for the solenoid on the engine harness.

4. Turn the key switch to the ON position.

5. Access the "Special Tests" under the "Diagnostics" menu.

6. Start the "intake valve actuator pressure solenoid Test" on Cat ET.

7. Once Cat ET displays the status of the intake valve actuator pressure solenoid, stop the "intake valve actuator pressure solenoid Test".

Expected Result:

The test indicated "Not Active: Device Short" with the jumper wire in place.

Results:

• OK - The test indicated "Not Active: Device Short". The ECM recognized the short at the connector for the intake valve actuator pressure solenoid. The harness wiring is OK.

  Repair: Temporarily connect a new intake valve actuator pressure solenoid to the harness, but do not install the new intake valve actuator pressure solenoid in the engine. Verify that there are no active diagnostic codes for the intake valve actuator pressure solenoid. If there are no active diagnostic codes for the intake valve actuator pressure solenoid, permanently install the new intake valve actuator pressure solenoid. Clear any logged diagnostic codes.

  STOP

• Not OK - The test indicated "Not Active: Device Open". The ECM did not see the short at the connector for the intake valve actuator pressure solenoid. Proceed to Test Step 4.

Test Step 4. Create a Short at the ECM

1. Turn the key switch to the OFF position.

2. Disconnect the P2 ECM connector.

3. Remove the wires from P2-3 (intake valve actuator pressure solenoid) and P2-79 (return for the intake valve actuator).

4. Fabricate a jumper wire to short P2-3 (intake valve actuator pressure solenoid) and P2-79 (return for the intake valve actuator).

5. Reconnect the P2 ECM connector.

6. Turn the key switch to the ON position.

7. Access the "Special Tests" under the "Diagnostics" menu.

8. Start the "intake valve actuator pressure solenoid Test" on Cat ET.

9. Once Cat ET displays the status of the intake valve actuator pressure solenoid, stop the "intake valve actuator pressure solenoid Test".

Expected Result:

The test indicated "Not Active: Device Short" with the jumper wire in place.

Results:

• OK - The test indicated "Not Active: Device Short" with the jumper wire in place. The ECM recognized the short.

  Repair: Check continuity of the wire T852-GY(Grey) between the connector for the intake valve actuator pressure solenoid and P2-3. If the wire is open, replace the wire.

  Check continuity of wire H807-YL(Yellow) between the connector for the intake valve actuator pressure solenoid and P2-79. If the wire is open, replace the wire.

  STOP

• Not OK - The test indicated "Not Active: Device Open" with the jumper wire in place. The ECM did not recognize the short circuit.

  Repair: Replace the ECM. Refer to Troubleshooting, "Replacing the ECM". Verify that the problem is resolved.

  Verify that the repair eliminates the problem.

  STOP

Test Step 5. Create an Open at the Solenoid

1. Turn the key switch to the OFF position.

2. Disconnect the intake valve actuator pressure solenoid at the solenoid connector.

3. Turn the key switch to the ON position.

4. Access the "Special Tests" under the "Diagnostics" menu.

5. Start the "intake valve actuator pressure solenoid Test" on Cat ET.

6. Once Cat ET displays the status of the intake valve actuator pressure solenoid, stop the "intake valve actuator pressure solenoid Test".

Expected Result:

The test indicates "Not Active: Device Open".

Results:

• OK - The test indicates "Not Active: Device Open". The ECM recognized the open at the connector for the intake valve actuator pressure solenoid. The harness wiring is OK.

  Repair: Temporarily connect a new intake valve actuator pressure solenoid to the harness, but do not install the new intake valve actuator pressure solenoid in the engine. Verify that there are no active diagnostic codes for the intake valve actuator pressure solenoid. If there are no active diagnostic codes for the intake valve actuator pressure solenoid, permanently install the new intake valve actuator pressure solenoid. Clear any logged diagnostic codes.

  STOP

• Not OK - The test indicates "Not Active: Device Short". Proceed to Test Step 6.

Test Step 6. Create an Open at the ECM

1. Turn the key switch to the OFF position.

2. Disconnect the P2 ECM connector.

3. Check the ECM connector for corrosion and for moisture.

4. Remove the wires from P2-3 (intake valve actuator pressure solenoid) and P2-79 (Return for the intake valve actuator).

5. Reconnect the P2 ECM connector.

6. Turn the key switch to the ON position.

7. Access the "Special Tests" under the "Diagnostics" menu.

8. Start the "intake valve actuator pressure solenoid Test" on Cat ET.

9. Once Cat ET displays the status of the intake valve actuator pressure solenoid, stop the "intake valve actuator pressure solenoid Test".

Expected Result:

The test indicates "Not Active: Device Open".

Results:

• OK - The test indicates "Not Active: Device Open". The ECM recognized the open at the ECM.

  Repair: Measure the resistance between wire T852-GY(Grey) and every terminal on ECM connector P1 and ECM connector P2. Measure the resistance between wire T852-GY(Grey) and engine ground. If the wire is shorted, replace the wire.

  Measure the resistance between wire H807-YL(Yellow) and every terminal on ECM connector P1 and ECM connector P2. If the wire is shorted, replace the wire.

  STOP

• Not OK - The test indicates "Not Active: Device Short". The ECM did not recognize the open.

  Repair: Replace the ECM. Refer to Troubleshooting, "Replacing the ECM". Verify that the problem is resolved.

  STOP