Engine Control System - SFI System (to 12/2010)

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0011, P0012, P0021, P0022: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1)


DESCRIPTION

The Variable Valve Timing (VVT) system includes the ECM, Oil Control Valve (OCV) and VVT controller. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed according to engine operating conditions such as intake air volume, throttle valve position and engine coolant temperature. The ECM controls the OCV, based on the signals transmitted by several sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improve, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control. This is how the target intake valve timing is verified by the ECM.





MONITOR DESCRIPTION

1. The ECM optimizes the intake valve timing using the VVT (Variable Valve Timing) system to control the intake camshaft. The VVT system includes the ECM, the Oil Control Valve (OCV) and the VVT controller.

2. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the intake camshaft.

If the difference between the target and actual intake valve timing is large, and changes in the actual intake valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and sets a DTC.

- Example:

- A DTC is set when the following conditions "A" and "B" are met:

1. It takes 5 seconds or more to change the valve timing by 5°CA (Condition "A").

2. After the above condition is met, the camshaft timing oil control valve assembly is forcibly activated 10 seconds (Condition "B").

3. DTCs P0011 and P0021 (Advanced Cam Timing) are detected with 1 trip detection logic.

4. DTCs P0012 and P0022 (Retarded Cam Timing) are detected with 2 trip detection logic.

These DTCs indicate that the VVT controller cannot operate properly due to OCV malfunctions or the presence of foreign objects in the OCV.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

Advanced camshaft timing:





Retard camshaft timing:





MONITOR RESULT

Refer to Checking Monitor Status Checking Monitor Status (to 12/2010).

CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the ignition switch to ON and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear (to 12/2010).

4. Turn the ignition switch off and wait for 30 seconds.

5. Turn the ignition switch to ON and turn the Techstream on [A].

6. Start the ignition and warm it up until the engine coolant temperature reaches 75°C (167°F) or more [B].

7. Drive the vehicle for 5 minutes or more [C].

8. Idle the engine for 30 seconds or more [D].

9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

10. Read the pending DTCs [E].

11. If a pending DTC is output, the system is malfunctioning.

HINT
If a pending DTC is not output, perform the following procedure.

12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

13. Input the DTC: P0011, P0012, P0021 or P0022.

14. Check the DTC judgment result.





CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [F] through [H].

15. Drive the vehicle for 5 minutes or more [F].

16. Idle the engine for 30 seconds or more [G].

17. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

18. Input the DTC: P0011, P0012, P0021 or P0022.

19. Check the DTC judgment result again [H].

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.

20. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear (to 12/2010).

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

- If the difference between the target and actual camshaft timings is greater than the specified value, the ECM operates the VVT actuator.

- Then, the ECM monitors the camshaft timing change for 5 seconds.

WIRING DIAGRAM

Refer to DTC P0010 Engine Control System - SFI System (to 12/2010).

INSPECTION PROCEDURE

HINT






- If DTC P0011 or P0012 is displayed, check the intake camshaft circuit for the right bank VVT system (bank 1).
- Bank 1 refers to the bank that includes cylinder No. 1.
- If DTC P0021 or P0022 is displayed, check the intake camshaft circuit for the left bank VVT system (bank 2).
- Bank 2 refers to the bank that does not include cylinder No. 1.
- Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0011, P0012, P0021 OR P0022)

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to ON and turn the Techstream on.

(c) Enter the following menus: Powertrain / Engine / Trouble Codes.

(d) Read the DTCs.

Result:





HINT
If any DTCs other than P0011, P0012, P0021 or P0022 are output, troubleshoot those DTCs first.

B -- GO TO DTC CHART Diagnostic Trouble Code Chart (to 12/2010)
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT SYSTEM (BANK 1 OR BANK 2))

(a) Connect Techstream to the DLC3.

(b) Start the engine and turn the Techstream on.

(c) Enter the following menus: Powertrain / Engine / Active Test / Control the VVT System (Bank1) or Control the VVT System (Bank2).

(d) Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.

OK:





NG -- CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
OK -- Continue to next step.

3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0011, P0012, P0021 OR P0022)

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to ON and turn the Techstream on.

(c) Clear the DTCs DTC Check / Clear (to 12/2010).

(d) Start the engine.

(e) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

(f) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

(g) Read the pending DTCs using the Techstream.

OK:

No pending DTC output.

HINT
DTC P0011, P0012, P0021 or P0022 is output when foreign objects in engine oil are caught in some parts of the system. These codes will stay output even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem.

NG -- CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)

OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems

4. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)

(a) Remove the cylinder head cover sub-assemblies RH and LH.





(b) Turn the crankshaft to align the timing marks of the crankshaft.

(c) Align the notch of the crankshaft pulley to the "0" position.

(d) Check if the timing marks of the camshaft pulley and camshaft bearing cap align.

(e) Turn the crankshaft clockwise by 360° if the timing marks do not align. Check if they align once again.

OK:

The timing marks of the camshaft pulley and the camshaft bearing cap align when the notch of the crankshaft pulley is in the "0" position.

(f) Reinstall the cylinder head cover sub-assemblies RH and LH.

NG -- ADJUST VALVE TIMING
OK -- Continue to next step.

5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR INTAKE CAMSHAFT)

(a) Remove the OCV for intake camshaft.





(b) Measure the resistance between the terminals of the OCV.

Standard resistance:





(c) Connect the positive (+) battery terminal to terminal 1 and connect the negative (-) battery terminal to terminal 2. Check the valve operation.





OK:

Valve moves quickly.

(d) Reinstall the OCV.

NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR INTAKE CAMSHAFT)
OK -- Continue to next step.

6. INSPECT OIL CONTROL VALVE FILTER AND OIL PIPE

(a) Remove the No. 1 oil pipe or No. 2 oil pipe.





(b) Remove the oil control valve filter RH or oil control valve filter LH.

(c) Check that the oil control valve filter and oil pipe are not clogged.

OK:

The oil control valve filter and oil pipe are not clogged.

(d) Reinstall the oil control valve filter RH or oil control valve filter LH.

(e) Reinstall the No. 1 oil pipe or No. 2 oil pipe.

NG -- REPLACE OIL CONTROL VALVE FILTER OR OIL PIPE
OK -- Continue to next step.

7. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY

(a) Replace the camshaft timing gear assembly (bank 1 or bank 2) Disassembly.

NEXT -- CHECK WHETHER DTC OUTPUT RECURS

8. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to ON and turn the Techstream on.

(c) Clear the DTCs DTC Check / Clear (to 12/2010).

(d) Start the engine.

(e) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

(f) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

(g) Read the pending DTCs using the Techstream.

OK:

No pending DTC output.

OK -- END

NG -- REPLACE ECM Removal (to 12/2010)