P0024
2GR-FE 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
HINT
If DTC P0014, P0015, P0024 or P0025 is present, check the VVT (Variable Valve Timing) system.
The Variable Valve Timing (VVT) system includes the ECM, 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 the 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 exhaust 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 exhaust 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 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.
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 exhaust camshaft.
3. If the difference between the target and actual exhaust valve timings 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 stored when the following conditions 1 and 2 are met for 10 seconds or more:
- 1. It takes 5 seconds or more to change the valve timing by 5°CA.
- 2. After the above condition 1 is met, the OCV is forcibly activated for 10 seconds.
4. DTCs P0014 and P0024 (Advanced Cam Timing) are detected with 2 trip detection logic.
5. DTCs P0015 and P0025 (Retarded Cam Timing) are detected with 1 trip detection logic.
6. 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:
Retarded camshaft timing:
MONITOR RESULT
Refer to CHECKING MONITOR STATUS Mode 6 Data.
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) Reading and Clearing Diagnostic Trouble Codes.
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 at approximately 37 mph (60 km/h) for 10 minutes or more [C].
8. Idle the engine for 3 minutes or more [D].
9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
10. Read the pending DTC [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: P0014, P0015, P0024 or P0025.
14. Check the DTC judgment result.
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. Repeat the pattern of accelerating the vehicle from rest to approximately 37 mph (60 km/h) and then decelerating the vehicle 10 to 15 times [F].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT
Depress the accelerator pedal by a large amount.
16. Idle the engine for 3 minutes or more [G].
17. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
18. Input the DTC: P0014, P0015, P0024 or P0025.
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 Reading and Clearing Diagnostic Trouble Codes.
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 exhaust camshaft circuit for the bank 1 VVT system.
- If DTC P0024 or P0025 is displayed, check the exhaust camshaft circuit for the bank 2 VVT system.
- Bank 1 refers to the bank that includes the No. 1 cylinder*.
- *: The No. 1 cylinder is the cylinder which is farthest from the transaxle.
- Bank 2 refers to the bank that does not include the No. 1 cylinder.
- Read freeze frame data using the 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 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 the 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 (OPERATE OCV)
(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 (Bank 1) or Control the VVT Exhaust Linear (Bank 2).
(e) Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.
OK:
HINT
Refer to "Data List / Active Test" [VVT Ex OCV Duty #1, VVT Ex Chg Angle #1, VVT Ex OCV Duty #2 and VVT Ex Chg Angle #2] Data List / Active Test.
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 the DTCs Reading and Clearing Diagnostic Trouble Codes.
(d) Start the engine and warm it up.
(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.
NG -- CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
OK -- CHECK FOR INTERMITTENT PROBLEMS
4. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
(a) Remove the cylinder head covers RH and LH.
(b) Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
(c) Check that the timing marks of the camshaft timing gears are aligned with the timing marks of the bearing cap as shown in the illustration.
If not, turn the crankshaft 1 revolution (360°), then align the marks as above.
OK:
The timing marks on the crankshaft timing gears are aligned as shown in the illustration.
(d) Reinstall the cylinder head covers.
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV FOR EXHAUST CAMSHAFT)
(a) Remove the OCV.
(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 EXHAUST CAMSHAFT) Components
OK -- Continue to next step.
6. INSPECT OIL CONTROL VALVE FILTER AND PIPE
(a) Remove the oil pipe No. 1 or No. 2.
(b) Remove the oil control valve filter.
(c) Check that the filter and pipe are not clogged.
OK:
Filter is not clogged.
NG -- REPLACE OIL CONTROL VALVE FILTER OR PIPE
OK -- Continue to next step.
7. REPLACE EXHAUST CAMSHAFT TIMING GEAR ASSEMBLY
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 the DTCs.
(d) Start the engine and warm up 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 P0014, P0015, P0024 or P0025 may be stored when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain stored even system returns to normal after a short time. Foreign objects are filtered out by the oil filter.
OK -- END
NG -- REPLACE ECM Removal