The Variable Valve Timing (VVT) system includes the ECM, camshaft timing oil control valve and VVT controller. The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve. 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 camshaft timing oil control valve based on the signals transmitted by several sensors. The VVT controller regulates the exhaust camshaft angle using oil pressure through the camshaft timing oil control valve. 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 P0014 Camshaft Position B - Timing Over-Advanced Or System Performance (Bank 1). 1GR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

DTC No.	DTC Detection Condition	Trouble Area
P0014 P0024	Exhaust valve timing is not adjusted in the advance range (2 trip detection logic).	Valve timing Camshaft timing oil control valve assembly (for exhaust side) Oil control valve filter Camshaft timing exhaust gear assembly ECM
P0015 P0025	Exhaust valve timing is not adjusted in the retard range (1 trip detection logic).	Valve timing Camshaft timing oil control valve assembly (for exhaust side) Oil control valve filter 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, camshaft timing oil control valve and VVT controller.

The ECM sends a target duty cycle control signal to the camshaft timing oil control valve. 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 a VVT controller being stuck and stores a DTC.

Example:

A DTC is stored when the following conditions 1 and 2 are met:

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 63 times or more (when the vehicle is idling, this takes approximately 100 seconds).

These DTCs indicate that the VVT controller cannot operate properly due to camshaft timing oil control valve malfunctions or the presence of foreign objects in the camshaft timing oil control valve.

WIRING DIAGRAM

Refer to DTC P0013 ().

INSPECTION PROCEDURE

HINT:

Abnormal Bank	Timing Over-advanced (Valve Timing is Out of Specified Range)	Timing Over-retarded (Valve Timing is Out of Specified Range)
Bank 1	P0014	P0015
Bank 2	P0024	P0025

If DTC P0014 or P0015 is output, check the bank 1 VVT system for the exhaust camshaft circuit.

Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.

If DTC P0024 or P0025 is output, check the bank 2 VVT system for the exhaust camshaft circuit.

Bank 2 refers to the bank that does not include the No. 1 cylinder.

Read freeze frame data using the GTS. 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.

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

Connect the GTS to the DLC3.

Turn the ignition switch to ON and turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Read the DTCs.

Result
Result	Proceed to
P0014, P0015, P0024 or P0025 is output	A
P0014, P0015, P0024 or P0025 and other DTCs are output	B

HINT:

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

GO TO DTC CHART ()

A

2.PERFORM ACTIVE TEST USING GTS (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE)

Connect the GTS to the DLC3.

Start the engine.

Turn the GTS on.

Warm up the engine.

Turn the A/C on.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Exhaust Linear (Bank 1) or Control the VVT Exhaust Linear (Bank 2).

Check the engine speed while operating the camshaft timing oil control valve using the GTS.

OK:
GTS Operation Specified Condition
0% Normal engine speed
100% Engine idles roughly or stalls

Go to step 4

OK

3.CHECK WHETHER DTC OUTPUT RECURS (DTC P0014, P0015, P0024 OR P0025)

Connect the GTS to the DLC3.

Turn the GTS on.

Clear the DTCs ().

Warm up the engine.

Switch the ECM from normal mode to check mode using the GTS ().

Drive the vehicle for more than 10 minutes.

Read the DTCs using the GTS.

OK:
No DTC output.

Go to step 4

END

4.CHECK VALVE TIMING (CHECK FOR LOOSE TEETH AND WHETHER TIMING CHAIN HAS JUMPED TOOTH)

Dtc P0014 Camshaft Position B - Timing Over-Advanced Or System Performance (Bank 1). 1GR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Remove the cylinder head cover RH and LH.

Text in Illustration
*1	Timing Mark

Turn the crankshaft pulley and align its groove with the "0" timing mark on the timing chain cover.

Check that the timing marks on 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°), and then align the marks as above.

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

Reinstall the cylinder head cover RH and LH.

CHECK ENGINE MECHANICAL SYSTEM ()

OK

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

Inspect the camshaft timing oil control valve assembly ().

REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY ()

OK

6.INSPECT OIL CONTROL VALVE FILTER AND OIL PIPE

Remove the No. 1 or No. 2 oil pipe.

Text in Illustration
*1	No. 1 Oil Pipe
*2	No. 2 Oil Pipe

Remove the oil control valve filter.

Check that the filter and pipe are not clogged.

OK:
The filter and pipe are not clogged.

Reinstall the oil control valve filter.

Reinstall the No. 1 or No. 2 oil pipe.

CLEAN OIL CONTROL VALVE FILTER AND OIL PIPE

OK

7.REPLACE CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY

Replace the camshaft timing exhaust gear assembly ().

NEXT

8.CHECK WHETHER DTC OUTPUT RECURS (DTC P0014, P0015, P0024 OR P0025)

Connect the GTS to the DLC3.

Turn the GTS on.

Clear the DTCs ().

Warm up the engine.

Switch the ECM from normal mode to check mode using the GTS ().

Drive the vehicle for more than 10 minutes.

Read the output DTCs using the GTS.

OK:
No DTC output.

HINT:

DTC P0014, P0015, P0024 or P0025 is stored when foreign objects in the engine oil are caught in some parts of the system. These codes will remain stored 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.

REPLACE ECM ()

SYSTEM IS OK

1GR-FE ENGINE CONTROL

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

SFI SYSTEM

GTS Operation	Specified Condition
0%	Normal engine speed
100%	Engine idles roughly or stalls