Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Check any other dtcs output (in addition to dtc p0011 or p0012)

  5. Perform active test using intelligent tester (operate ocv)

  6. Check whether dtc output recurs (dtc p0011 or p0012)

  7. Check valve timing (check for loose and jumped teeth on timing chain)

  8. Inspect camshaft timing oil control valve assembly (ocv)

  9. Inspect oil control valve filter

  10. Replace camshaft timing gear assembly

  11. Check whether dtc output recurs (dtc p0011 or p0012)

DTC P0011 Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1)

DTC P0012 Camshaft Position "A" - Timing Over-Retarded (Bank 1)

HINT:
If DTC P0011 or P0012 is present, check the VVT (Variable Valve Timing) system.

DESCRIPTION

The VVT system includes the ECM, Oil Control Valve (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 intake 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 intake 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.

Valve timing Yaris


DTC No.
DTC Detection Conditions
Trouble Areas
P0011
Advanced camshaft timing:
With warm engine and engine speed of between 550 rpm and 4,000 rpm, all conditions (1), (2) and (3) met (1 trip detection logic):
1. Difference between target and actual intake valve timings more than 5°CA (Crankshaft Angle) for 4.5 seconds
2. Current intake valve timing fixed (timing changes less than 5°CA in 5 seconds)
3. Variations in VVT controller timing more than 19°CA of maximum delayed timing (malfunction in advance timing)
  1. Valve timing
  2. OCV
  3. OCV filter
  4. Camshaft timing gear assembly
  5. ECM
P0012
Retarded camshaft timing:
With warm engine and engine speed of between 550 rpm and 4,000 rpm, all conditions (1), (2) and (3) met (2 trip detection logic):
1. Difference between target and actual intake valve timings more than 5°CA (Crankshaft Angle) for 4.5 seconds
2. Current intake valve timing fixed (timing changes less than 5°CA in 5 seconds)
3. Variations in VVT controller timing 19°CA or less of maximum delayed timing (malfunction in retarded timing)
  1. Valve timing
  2. OCV
  3. OCV filter
  4. Camshaft timing gear assembly
  5. ECM

WIRING DIAGRAM

Refer to DTC P0010 (Click here).

INSPECTION PROCEDURE

NOTICE:
DTC P0011 or P0012 may be set when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain set even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.
HINT:
Read freeze frame data using an intelligent tester. Freeze frame data record 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 P0011 OR P0012)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		Proceed To
    P0011 or P0012
    		A
    P0011 or P0012 and other DTCs
    		B
    HINT:
    If any DTCs other than P0011 or P0012 are output, troubleshoot those DTCs first.


Bnext
GO TO DTC CHART (Click here)
A
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2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE OCV)

  1. Connect an intelligent tester to the DLC3.

  1. Start the engine and turn the tester on.

  1. Warm up the engine.

  1. Select the following menu items: Powertrain / Engine and ECT / Active Test / Activate the VVT System (Bank 1).

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

    OK:
    Tester Operations
    		Specified Conditions
    OCV OFF
    		Normal engine speed
    OCV ON
    		Engine idles roughly or stalls
    (soon after OCV switched from OFF to ON)


NGnext
Go to step 4
OK
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3.CHECK WHETHER DTC OUTPUT RECURS (DTC P0011 OR P0012)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear DTCs (Click here ).

  1. Start the engine and warm it up.

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

  1. Drive the vehicle for more than 10 minutes.

  1. Read DTCs using the tester.

    OK:
    No DTC output.


NGnext
Go to step 4
OK
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END

4.CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
  1. Remove the cylinder head cover. Yaris

  2. Remove the cylinder head cover.

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

  1. Check that the timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward as shown in the illustration.

    1. If not, turn the crankshaft 1 revolution (360°), then align the marks as above.
    OK:
    Timing marks on camshaft timing gears are aligned as shown in the illustration.

  1. Reinstall the cylinder head cover.



NGnext
ADJUST VALVE TIMING
OK
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5.INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)
Remove the OCV. Yaris

  1. Remove the OCV.

  1. Measure the resistance between the terminals of the OCV.

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

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

    OK:
    Valve moves quickly.

  1. Reinstall the OCV.



NGnext
REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (Click here)
OK
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6.INSPECT OIL CONTROL VALVE FILTER
Remove the generator. Yaris

  1. Remove the generator.

  1. Remove the OCV filter.

  1. Check that the filter is not clogged.

    OK:
    Filter is not clogged.

  1. Reinstall the OCV filter.

  1. Reinstall the generator.



NGnext
CLEAN OIL CONTROL VALVE FILTER
OK
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7.REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
Click here

NEXT
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8.CHECK WHETHER DTC OUTPUT RECURS (DTC P0011 OR P0012)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear DTCs (Click here).

  1. Start the engine and warm it up.

  1. Switch the ECM from normal mode to check mode using the tester (Click here).

  1. Drive the vehicle for more than 10 minutes.

  1. Read output DTCs using the tester.

    OK:
    No DTC output.
    HINT:
    DTC P0011 or P0012 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 filter, thus eliminating the source of the problem.


OKnext
SYSTEM OK
NG
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REPLACE ECM (Click here)