Toyota Tundra Service Manual: Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1) (P0014,P0015,P0024,P0025)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1) (P0014,P0015,P0024,P0025)

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 exhaust valve timing is verified by the ECM.

DTC No.

DTC Detection Condition

Trouble Area

P0014

P0024

Exhaust valve timing is not adjusted in valve timing advance range

(2 trip detection logic)

  • Valve timing
  • Oil control valve (OCV) (for exhaust side of bank 1, 2)
  • OCV filter
  • Camshaft timing exhaust gear assembly
  • ECM

P0015

P0025

Exhaust valve timing is not adjusted in valve timing retard range

(1 trip detection logic)

  • Valve timing
  • OCV (for exhaust side of bank 1, 2)
  • OCV filter
  • Camshaft timing exhaust gear assembly
  • 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, Oil Control Valve (OCV) and 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.

    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 stuck malfunction 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 camshaft timing oil control valve is forcibly activated for 10 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.

MONITOR STRATEGY

Related DTCs

P0014: Advanced camshaft timing (for Bank 1)

P0015: Retarded camshaft timing (for Bank 1)

P0024: Advanced camshaft timing (for Bank 2)

P0025: Retarded camshaft timing (for Bank 2)

Required sensors/Components (Main)

VVT OCV and VVT Actuator

Required sensors/Components (Related)

Crankshaft position sensor, Camshaft position sensor and Engine coolant temperature sensor

Frequency of operation

Continuous

Duration

Within 10 seconds

MIL operation

Advanced camshaft timing: 2 driving cycles

Retarded camshaft timing: Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs are not present

P0013, P0023 (Exhaust VVT oil control valve)

P0017, P0019 (Exhaust VVT system - Misalignment)

P0102, P0103 (Mass air flow meter)

P0107, P0108 (Manifold absolute pressure)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P0335 (Crankshaft position sensor)

P1340 (Camshaft position sensor)

Battery voltage

11 V or more

Engine RPM

500 to 4000 rpm

Engine coolant temperature

75 to 100°C (167 to 212°F)

TYPICAL MALFUNCTION THRESHOLDS

Advanced Camshaft Timing

Both conditions are met:

-

Deviation of actual valve timing and target valve timing

More than 5°CA (Crankshaft Angle) for 5 seconds or more after the VVT hold duty ratio learned value reaches the upper or lower limit.

Valve timing

No change at advanced valve timing

Retarded Camshaft Timing

Both conditions are met:

-

Deviation of actual valve timing and target valve timing

More than 5°CA (Crankshaft Angle) for 5 seconds or more after the VVT hold duty ratio learned value reaches the upper or lower limit.

Valve timing

No change at retarded valve timing

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on [A].
  6. Start the engine and warm it up until the ECT reaches 75°C (167°F) or higher [B].
  7. Drive the vehicle at approximately 60 km/h (37 mph) for 10 minutes or more [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  8. Idle the engine for 3 minutes or more [D].
  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
  10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: P0014, P0015, P0024 or P0025.
  13. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform steps [F] through [H].
  14. Repeat the pattern of accelerating the vehicle from rest to approximately 60 km/h (37 mph) 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 target amount.

  15. Idle the engine for 3 minutes or more [G].
  16. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [H].
  17. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  18. Check the DTC judgment result again.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the following procedure.
  19. Perform a universal trip and check for permanent DTCs (See page ).

    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 (See page ).

CAUTION / NOTICE / HINT

Abnormal Bank

Advanced Timing Over

(Valve Timing Out of Specified Range)

Retarded Timing Over

(Valve Timing 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 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 displayed, check the bank 2 VVT system for exhaust camshaft circuit.
  • Bank 2 refers to the bank that does not include the 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 ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Read DTCs.

Result

Result

Proceed to

P0014, P0015, P0024 or P0025

A

P0014, P0015, P0024 or P0025 and other DTCs

B

HINT:

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

B

GO TO DTC CHART

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV)

(a) Connect the Techstream to the DLC3.

(b) Turn the Techstream on.

(c) Warm up the engine.

(d) Enter the following menus: Powertrain / Engine and ECT / 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:

Tester Operation

Specified Condition

0%

Normal engine speed

100%

Engine idles roughly or stalls

NG

GO TO STEP 4

OK

3.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the Techstream on.

(c) Clear DTCs (See page ).

(d) Warm up the engine.

(e) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

(f) Read the output pending DTCs using the Techstream.

OK:

No pending DTC output.

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

4.

CHECK VALVE TIMING (CHECK FOR LOOSENESS IN TIMING CHAIN OR JUMPED TOOTH)

(a) Remove the cylinder head cover LH and RH.

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

(c) Check that the alignment marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.

HINT:

  • If the alignment marks are not as shown, turn the crankshaft one revolution clockwise.
  • If the result is not as specified, check mechanical parts related to valve timing for looseness in the timing chain, jumped teeth, etc.

OK:

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

NG

CHECK ENGINE MECHANICAL SYSTEM

OK

5.

INSPECT CAMSHAFT OIL CONTROL VALVE ASSEMBLY (OCV)

(a) Remove the OCV (See page ).

(b) 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

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

OK:

Valve moves quickly.

NG

REPLACE CAMSHAFT OIL CONTROL VALVE ASSEMBLY

OK

6.

INSPECT OIL CONTROL VALVE FILTER

(a) Remove the oil control valve filter (See page ).

(b) Check that the filter is not clogged.

OK:

Filter is not clogged.

NG

CLEAN OIL CONTROL VALVE FILTER

OK

7.

REPLACE CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY

(a) Replace the camshaft timing exhaust gear assembly (See page ).

HINT:

Perform "Inspection After Repair" after replacing the camshaft timing exhaust gear assembly (See page ).

NEXT

8.

CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the Techstream on.

(c) Clear DTCs (See page ).

(d) Warm up the engine.

(e) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

(f) Read the output pending DTCs using the Techstream.

OK:

No pending DTC output.

HINT:

DTC P0014, P0015, P0024 or P0025 is output when foreign objects in the 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 filter, thus eliminating the source of the problem.

OK

END

NG

REPLACE ECM

    Camshaft Position "B" Actuator Circuit / Open (Bank 1) (P0013,P0023)

    A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1 (P014C-P014F,P015A-P015D)

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