Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE OCV)

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

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

INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV FOR EXHAUST CAMSHAFT)

INSPECT OIL CONTROL VALVE FILTER AND PIPE

REPLACE CAMSHAFT TIMING GEAR ASSEMBLY (FOR EXHAUST CAMSHAFT)

CHECK WHETHER DTC OUTPUT RECURS

DTC P0014 Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1)

DTC P0015 Camshaft Position "B" - Timing Over-Retarded (Bank 1)

DTC P0024 Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 2)

DTC 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.


Dtc P0014 Camshaft Position B - Timing Over-Advanced Or System Performance (Bank 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

DTC No.DTC Detection ConditionTrouble Area
P0014
P0024		Advanced cam timing:
With warm engine and engine speed of between 500 rpm and 4,000 rpm, all conditions (a), (b) and (c) met
(2 trip detection logic):
(a) Difference between target and actual exhaust valve timing more than 5 °CA (Crankshaft Angle) for 4.5 seconds
(b) Current exhaust valve timing fixed (timing changes less than 5°CA in 5 seconds)
(c) Variations in VVT controller timing more than 19°CA of maximum delayed timing (advanced)
Valve timing
Oil control valve (OCV) for exhaust camshaft (bank 1)
OCV filter (bank 1)
Exhaust camshaft timing gear assembly
ECM
P0015
P0025		Retarded cam timing:
With warm engine and engine speed of between 500 rpm and 4,000 rpm, all conditions (a), (b) and (c) met
(1 trip detection logic):
(a) Difference between target and actual exhaust valve timing more than 5°CA (Crankshaft Angle) for 4.5 seconds
(b) Current exhaust valve timing fixed (timing changes less than 5°CA in 5 seconds)
(c) Variations in VVT controller timing more than 19°CA or less of maximum delayed timing (retarded)
Valve timing
OCV for exhaust camshaft (bank 2)
OCV filter (bank 2)
Exhaust camshaft timing gear assembly
ECM

WIRING DIAGRAM

Dtc P0014 Camshaft Position B - Timing Over-Advanced Or System Performance (Bank 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

  • HINT:
Abnormal bankAdvanced timing over
(Valve timing is out of specified range)		Retarded timing over
(Valve timing is out of specified range)
Bank 1P0014P0015
Bank 2P0024P0025
If DTC P0014 or P0015 is displayed, check the bank 1 VVT system for exhaust camshaft 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 camshaft 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 .
1.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: Power train / Engine / DTC.

Read DTCs.

  • Result:
  • Display (DTC output)Proceed to
    P0014, P0015, P0024 or P0025A
    P0014, P0015, P0024 or P0025 and other DTCsB
  • HINT:
  • If any DTCs other than P0014, P0015, P0024 or P0025 are output, troubleshoot those DTCs first.
B
Go to step 4
OK
3.CHECK WHETHER DTC OUTPUT RECURS (DTC P0014, P0015, P0024 OR P0025)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG) and turn the tester ON.

Clear DTCs .

Start the engine and warm it up.

Switch the ECM from normal mode to check mode using the tester .

Drive the vehicle for more than 10 minutes.

Read DTCs using the tester.

  • OK:
  • No DTC output.
NG
Go to step 4
OK
END
4.CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
Dtc P0014 Camshaft Position B - Timing Over-Advanced Or System Performance (Bank 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Remove the cylinder head covers RH and LH.

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

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:
  • Timing marks on crankshaft timing gears are aligned as shown in the illustration.

Reinstall the cylinder head covers.

NG
ADJUST VALVE TIMING
OK
5.INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV FOR EXHAUST CAMSHAFT)
Dtc P0014 Camshaft Position B - Timing Over-Advanced Or System Performance (Bank 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Remove the OCV.

Measure the resistance between the terminals of the OCV.

  • Standard resistance:
  • 6.9 to 7.9 Ω at 20°C (68°F)

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

  • OK:
  • Valve moves quickly.

Reinstall the OCV.

NG
REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
OK
6.INSPECT OIL CONTROL VALVE FILTER AND PIPE
Dtc P0014 Camshaft Position B - Timing Over-Advanced Or System Performance (Bank 1). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

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

Remove the oil control valve filter.

Check that the filter and pipe are not clogged.

  • OK:
  • Filter is not clogged.
NG
CLEAN OIL CONTROL VALVE FILTER AND PIPE
OK
7.REPLACE CAMSHAFT TIMING GEAR ASSEMBLY (FOR EXHAUST CAMSHAFT)
NEXT
8.CHECK WHETHER DTC OUTPUT RECURS

Clear the DTCs.


Operate the intelligent tester, or disconnect the EFI and ETCS fuses more than 60 sec. to erase the codes.

Start the engine and warm up the engine.

Switch the ECM from normal mode to check mode using the intelligent tester .

Drive the vehicle for more than 10 minutes or more.

Read output DTCs using the intelligent tester.

  • 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 IS OK
NG
REPLACE ECM
LEXUS IS250, IS220d / GSE20 ALE20
4GR-FSE ENGINE CONTROL SYSTEM
Lexus IS250 IS220d GSE20 ALE20
SFI SYSTEM