P0025

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0014,P0015,P0024,P0025: Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1)
P0025 - Camshaft Position "B" - Timing Over-Retarded (Bank 2)

DESCRIPTION

Refer to DTC P0013 P0013.





MONITOR DESCRIPTION

The ECM optimizes the exhaust valve timing using the VVT (Variable Valve Timing) system to control the exhaust camshaft. The VVT system includes the ECM, the Oil Control Valve (OCV) and the 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. The VVT controller can advance or retard the exhaust camshaft.

If the difference between the target and actual exhaust valve timing is large, and changes in actual exhaust 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 condition is met for 10 seconds or more:

The difference between the target and actual exhaust valve timing is more than 5°CA (Crankshaft Angle) and the condition continues for more than 5 seconds.

DTCs P0014 and P0024 (Advanced Cam Timing) are subject to 2 trip detection logic.

DTCs P0015 and P0025 (Retarded Cam Timing) are subject to 1 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.

The monitor will not run unless the following conditions are met:

- The engine is warm (the engine coolant temperature is 75°C [167°F] or more).

- The vehicle has been driven at more than 40 mph (64 km/h) for 3 minutes.

- The engine has idled for 3 minutes (retarded angle side only).

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

Advanced camshaft timing:





Retarded camshaft timing:





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the engine switch on (IG) and turn the Techstream on.

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

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

5. Turn the engine switch on (IG) and turn the Techstream on [A].

6. Start the engine 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 / Utility / All Readiness.

10. Input the DTC: P0014, P0015, P0024 or P0025.

11. Check the DTC judgment result [E].





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 INCOMPLETE or UNKNOWN, perform steps [F] through [H].

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

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

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

15. Input the DTC: P0014, P0015, P0024 or P0025.

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

17. If the test result is UNKNOWN, enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

18. Read Pending DTCs [H].

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

19. 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.

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

WIRING DIAGRAM

Refer to DTC P0013 P0013.

INSPECTION PROCEDURE

HINT






- If DTC P0014 or P0015 is displayed, check the bank 1 VVT system for exhaust side circuit.
- Bank 1 refers to the bank that includes No. 1 cylinder.
- If DTC P0024 or P0025 is displayed, check the bank 2 VVT system for exhaust side circuit.
- Bank 2 refers to the bank that does not include No. 1 cylinder.
- Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0014, P0015, P0024 OR P0025)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

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

(d) Read DTCs.

Result:





HINT
If any DTCs other than P0014, P0015, P0024 or P0025 are output, troubleshoot those DTCs first.

B -- GO TO DTC CHART SFI System
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (OCV FOR EXHAUST SIDE OPERATION)

(a) Connect the Techstream to the DLC3.

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

(c) Warm up the engine.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the VVT Exhaust Linear (Bank1) or Control the VVT Exhaust Linear (Bank2).

(e) 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 P0014, P0015, P0024 OR P0025)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Clear DTCs DTC Check / Clear.

(d) Start the engine and warm it up.

(e) Switch the ECM from normal mode to check mode using the Techstream Check Mode Procedure.

(f) With the engine warmed up, idle it for 1 minute. Then drive the vehicle for 5 minutes.

(g) Read DTCs using the Techstream.

OK:

No DTC output.

OK -- END
NG -- Continue to next step.

4. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN) P0016

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

5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

(a) Remove the OCV Removal.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(c) Apply the positive battery voltage to terminal 1 and negative battery voltage to terminal 2. Check the valve operation.

OK:

Valve moves quickly.

NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Removal
OK -- Continue to next step.

6. INSPECT OIL CONTROL VALVE FILTER

(a) Remove the cylinder head cover sub-assembly [1][2]Disassembly.

(b) Remove the OCV filter [1][2]Disassembly.

(c) Inspect the OCV filter.

OK:

Filter is not clogged.

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

7. REPLACE CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY

(a) Replace the camshaft timing exhaust gear assembly [1][2]Disassembly.

NEXT -- Continue to next step.

8. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Clear DTCs DTC Check / Clear.

(d) Start the engine and warm up.

(e) Switch the ECM from normal mode to check mode using the Techstream Check Mode Procedure.

(f) With the engine warmed up, idle it for 1 minute. Then drive the vehicle for 5 minutes.

(g) Read output DTCs using the Techstream.

OK:

No DTC output.

HINT
DTC P0014, P0015, P0024 or P0025 is output when foreign objects in engine oil are caught in some parts of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil, thus eliminating the source of the problem.

OK -- SYSTEM OK

NG -- REPLACE ECM Removal