SFI SYSTEM, Diagnostic DTC:P0014, P0015, P0024, P0025

DTC Code	DTC Name
P0014	Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1)
P0015	Camshaft Position "B" - Timing Over-Retarded (Bank 1)
P0024	Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 2)
P0025	Camshaft Position "B" - Timing Over-Retarded (Bank 2)

DESCRIPTION

Tech Tips

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 VVT and crankshaft position sensors, and performs feedback control. This is how the target exhaust valve timing is verified by the ECM.

DTC No.	DTC Detection Condition	Trouble Area
P0014 P0024	Warm up the engine and engine idling. Exhaust valve timing does not change for 1 minutes or more in advanced position (2 trip detection logic):	Valve timing Oil control valve (OCV) for exhaust side (bank 1, 2) Cylinder head cover sub-assembly (bank 1, 2) Camshaft timing exhaust gear assembly ECM
P0015 P0025	Warm up the engine and drive the vehicle. Exhaust valve timing does not change for 5 minutes or more in retarded position (1 trip detection logic):	Valve timing OCV for exhaust side (bank 1, 2) Cylinder head cover sub-assembly (bank 1, 2) Camshaft timing exhaust gear assembly ECM

DTC No.

DTC Detection Condition

Trouble Area

P0014

P0024

Warm up the engine and engine idling.

Exhaust valve timing does not change for 1 minutes or more in advanced position

(2 trip detection logic):

Valve timing
Oil control valve (OCV) for exhaust side (bank 1, 2)
Cylinder head cover sub-assembly (bank 1, 2)
Camshaft timing exhaust gear assembly
ECM

P0015

P0025

Warm up the engine and drive the vehicle.

Exhaust valve timing does not change for 5 minutes or more in retarded position

(1 trip detection logic):

Valve timing
OCV for exhaust side (bank 1, 2)
Cylinder head cover sub-assembly (bank 1, 2)
Camshaft timing exhaust gear assembly
ECM

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 conditions A, B and C are met:

The difference between the target and actual exhaust valve timing is more than 5°CA (Crankshaft Angle) and the condition continues for more than 4.5 seconds (Procedure "A").
It takes 5 seconds or more to change the valve timing by 5°CA (Procedure "B").
After above procedures "A" and "B" are met, the OCV is forcibly activated 63 times or more (Procedure "C").

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).

WIRING DIAGRAM

Refer to DTC P0013 Click here.

CAUTION / NOTICE / HINT

Tech Tips

Abnormal bank	Advanced timing over (Valve timing is out of specified range)	Retarded timing over (Valve timing is out of specified range)
Bank 1	P0014	P0015
Bank 2	P0024	P0025

Abnormal bank

Advanced timing over

(Valve timing is out of specified range)

Retarded timing over

(Valve timing is out of specified range)

Bank 1

P0014

P0015

Bank 2

P0024

P0025

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 cylinder No. 1.
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 cylinder No. 1.
Read freeze frame data using the intelligent tester. 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

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

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the tester ON.
Enter the following menus: Powertrain / Engine / DTC.

Read DTCs.

Result

Display (DTC output)	Proceed to
P0014, P0015, P0024 or P0025	A
P0014, P0015, P0024 or P0025 and other DTCs	B

Tech Tips

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

GO TO DTC CHART Click here

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE OCV)

Connect the intelligent tester to the DLC3.
Start the engine and turn the tester ON.
Warm up the engine.
Enter the following menus: Powertrain / Engine / Active Test / VVT Exhaust Linear (Bank 1) or VVT Exhaust Linear (Bank 2).

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

Tester Operation	Specified Condition
0%	Normal engine speed
30%	Engine idles roughly

CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN) Click here

CHECK WHETHER DTC OUTPUT RECURS (DTC P0014, P0015, P0024 OR P0025)
1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and turn the tester ON.
3. Clear DTCs Click here.
4. Start the engine and warm it up.
5. Switch the ECM from normal mode to check mode using the tester Click here.
6. Drive the vehicle for more than 10 minutes.
7. Read DTCs using the tester.
  
  OK
  
  No DTC output.
OK
END

NG
CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
*a Timing Mark
1. Remove the cylinder head cover bank 1 and bank 2.
2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
3. Rotate the crankshaft pulley and align its notch to timing mark 0 of the timing chain cover. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.
  
  OK
  
  Timing marks on camshaft timing gears are aligned as shown in the illustration.
4. Reinstall the cylinder head cover.
NG
ADJUST VALVE TIMING Click here

OK

OK
No DTC output.

*a	Timing Mark

OK
Timing marks on camshaft timing gears are aligned as shown in the illustration.

INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

*1 Valve Moves

Remove the OCV Click here.

*1	Valve Moves

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

Standard resistance

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	6.9 to 7.9 Ω

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

OK

Valve moves quickly.

OK
Valve moves quickly.

REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Click here

INSPECT OIL CONTROL VALVE FILTER
1. Remove the cylinder head cover sub-assembly Click here.
2. Remove the OCV filter Click here.
3. Inspect the OCV filter.
  
  OK
  
  Filter is not clogged.
NG
REPLACE OIL CONTROL VALVE FILTER Click here

OK
REPLACE CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY
1. Replace the camshaft timing exhaust gear Click here.
NEXT
CHECK WHETHER DTC OUTPUT RECURS
1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and turn the tester ON.
3. Clear DTCs Click here.
4. Start the engine and warm up.
5. Switch the ECM from normal mode to check mode using the tester Click here.
6. Warm up the engine.
7. Idle it for 1 minutes.
8. Drive the vehicle for more than 5 minutes.
9. Read output DTCs using the intelligent tester.
  
  OK
  
  No DTC output.
  
  Tech Tips
  
  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.
NG
REPLACE ECM Click here

OK
SYSTEM OK