DTC    P1386    Injector for Exhaust Fuel Addition

для подготовки Нажмите здесь


DESCRIPTION


A114032E03

The exhaust fuel addition injector is mounted on the exhaust port of the cylinder head, and low pressure is provided to the injector by the feed pump in the supply pump. This injector adds fuel by a control signal from the ECM.
This injector is used for two different controls: DPNR catalyst regeneration and nitrogen oxide (NOx) reduction.
Under the DPNR catalyst regeneration control, the injector adds fuel to raise a catalyst temperature.
In the other control, the injector helps the air-fuel ratio become RICH. As a result, NOx in the exhaust gas will be reduced in response to the RICH air-fuel ratio.

УКАЗАНИЕ:
  1. For more information on the exhaust fuel addition injector and TOYOTA D-CAT*1, refer to the following procedures (See page Нажмите здесь).
  2. If P1386 is present, refer to the diagnostic trouble code (DTC) chart for TOYOTA D-CAT (See page Нажмите здесь).
  3. "Learning value" represents a correction learning value of the fuel addition volume to raise the DPNR*2 catalyst temperature to a target range.
*1: Diesel Clean Advanced Technology
*2: Diesel Particulate-NOx Reduction system


DTC No.
DTC Detection Condition
Main Trouble Area
Related Trouble Area
P1386
Excess or low fuel addition volume from exhaust fuel addition injector:
Air-fuel ratio deviates from a value estimated by ECM while the injector is adding fuel
(1-trip detection logic)
  1. Open or short in exhaust fuel addition injector circuit
  2. Exhaust fuel addition injector
  3. DPNR catalytic converter (Manifold converter sub-assembly)
  1. Open in exhaust temperature sensor circuit
  2. A/F sensor
  3. Exhaust gas temperature sensor
  4. Supply pump assembly
  5. Mass air flow meter
  6. Fuel leaks in exhaust fuel addition injector
  7. Main injector
  8. Cylinder compression pressure
  9. Valve clearance
  10. Valve timing
  11. Blockage in air intake system
  12. Leakage in air intake system
  13. Blockage in exhaust system
  14. Leakage in exhaust system
  15. Blockage in EGR system
  16. Leakage in EGR system
  17. ECM
Low fuel addition volume from exhaust fuel addition injector:
Learning value*3 exceeds standard level
(1-trip detection logic)
Exhaust fuel addition injector nozzle stuck open:
Air-fuel ratio becomes RICHER than standard level, or exhaust gas temperature becomes higher than standard level
(1-trip detection logic)
*3: Correction learning value of the fuel addition volume to raise the DPNR catalyst temperature to a target range

УКАЗАНИЕ:
  1. DTC P2047, P2048 or P2049 will be present if there is an open in the exhaust fuel addition injector circuit.
  2. If any one of the main injectors has a closed valve malfunction, rough idle will result. Compensatory injection volume learning values of each cylinder can be read by using the intelligent tester. When the value is more than 3.0 mm3, the cylinder is malfunctioning.
  3. Usually compensation injection volume is 3.0 mm3 or less.


MONITOR DESCRIPTION

УКАЗАНИЕ:
"Learning value" represents a correction learning value of the fuel addition volume to raise the DPNR*4 catalyst temperature to a target range.
*4: Diesel Particulate-NOx Reduction system

In order to detect malfunctions in the exhaust fuel addition injector, the ECM monitors the air-fuel ratio, DPNR catalytic temperature and learning value.
  1. When the exhaust fuel addition injector adds fuel during NOx reduction, the ECM monitors the air-fuel ratio when the exhaust fuel addition injector adds fuel. If the air-fuel ratio is too RICH or too LEAN against the ECM predetermined air-fuel ratio, the ECM determines that the fuel addition volume is small or large, and illuminates the MIL. For this malfunction, there is no fail-safe operation.
  2. The ECM always monitors the DPNR catalytic converter temperature and the air-fuel ratio. When the temperature becomes higher than its usual level or the air-fuel ratio becomes extremely RICH, the ECM judges that the injector is stuck open and illuminates the MIL. If this malfunction occurs, the ECM enters the fail-safe mode to limit the acceptable vehicle speed to approximately 80 km/h (50 mph) by limiting the engine power.
  3. During DPNR catalyst regeneration, the ECM monitors the learning value. Normally, the learning value for the DPNR catalyst regeneration is in the vicinity of 1.0. Thus if the learning value is at 1.99 or more for a certain period of time, the ECM judges that the fuel addition volume from the injector is insufficient and illuminates the MIL. If this malfunction occurs, the ECM enters the fail-safe mode to limit the acceptable vehicle speed to approximately 80 km/h (50 mph) by limiting the engine power.

Malfunction Condition by Fail-Safe Operation: 
Fail-Safe Operation
Malfunction Condition
Malfunction Detection Condition
Drive Pattern
No fail-safe operation
Low or excess fuel addition volume from the exhaust fuel addition injector
When the exhaust fuel addition injector adds fuel during NOx reduction, if actual air-fuel ratio deviates from a value estimated by the ECM when the exhaust fuel addition injector adds fuel
After warming up the engine, perform DPNR REJU (PM) in the ACTIVE TEST menu using the intelligent tester, and drive at constant vehicle speed within 50 to 100 km/h (31 to 62 mph) for more than 15 minutes
Limits engine power to maximum vehicle speed of approximately 80 km/h (50 mph)
Exhaust fuel addition injector is stuck open
DPNR catalytic converter temperature becomes higher than 800°C (1472°F) or air-fuel ratio is less than approximately 12.0: 1 for a couple of seconds
Idling engine for more than 5 minutes*5
Limits engine power to maximum vehicle speed of approximately 80 km/h (50 mph)

УКАЗАНИЕ:
DPNR catalyst regeneration is prohibited

Low fuel addition volume from the exhaust fuel addition injector
During DPNR catalyst regeneration, when learning value of 1.99 or more continues for a certain period of time*6
After warming up the engine, perform DPNR REJU (PM) in the ACTIVE TEST menu using the intelligent tester, and drive at constant vehicle speed within 50 to 100 km/h (31 to 62 mph) for more than 30 minutes
*5: The DPNR catalytic converter temperature will not reach 800°C (1472°F) or higher during idle even if the exhaust fuel addition injector is stuck open.
*6: While the DPNR catalyst regeneration is performed, the ECM raises the DPNR catalytic converter temperature to more than 600°C (1112°F) by adding fuel using the exhaust fuel addition injector. If the temperature does not reach 600°C (1112°F) during the attempt, the correction learning value of the fuel addition volume increases by increments in order to raise the DPNR catalytic converter temperature to the target range.

A091206E09


WIRING DIAGRAM


A160322E01


INSPECTION PROCEDURE

УКАЗАНИЕ:
  1. "Learning value" used in here represents a correction learning value of the fuel addition volume to raise the DPNR catalyst temperature to a target range.
  2. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P1386)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG).

  1. Turn the tester on.

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

  1. Read the DTCs.

    Result:

    Result
    		Proceed to
    DTC P1386 is output
    		A
    DTC P1386 and other DTCs are output
    		B

    УКАЗАНИЕ:
    If codes other than P1386 are output, perform troubleshooting for those DTCs first.



B
GO TO DTC CHART (Нажмите здесь)
A


2.READ VALUE OF EXHAUST GAS TEMPERATURE

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG). (Do not start the engine.)

  1. Turn the tester on.

  1. Enter the following menu items: Powertrain / Engine and ECT / Data List / Initial Exhaust Temp (In) and Initial Exhaust Temp (Out).

  1. Read the value.

    Result:

    Result
    		Proceed to
    Temperature displayed: OK (Same value as actual exhaust gas temperature)
    		A
    Temperature displayed: 1000°C (1832°F)
    		B

    УКАЗАНИЕ:
    If there is an open circuit, the intelligent tester indicates 1000°C (1832°F).



B
GO TO DTC P0544, P0545, P0546, P2301, P2302, AND P2033 (RELATED TO EXHAUST GAS TEMPERATURE SENSOR)
A


3.PERFORM ENGINE RPM ACCELERATION (WHITE SMOKE AND FUEL SMELL)

ПРЕДОСТЕРЕЖЕНИЕ:
Stop the engine immediately if there is white smoke or a fuel smell during the inspection below. Fuel may be leaking from the exhaust fuel addition injector.

  1. Disconnect the battery cable for 1 minute, and then reconnect the cable.

  1. After the engine starts, promptly accelerate the engine to approximately 3000 rpm with no load 3 times.

  1. Check for white smoke in exhaust gases.

  1. Check for a fuel smell in exhaust gases.

    Result:

    Result
    		Proceed to
    Other than following
    		A
    Either white smoke or fuel smells in exhaust gases
    		B



B
Перейдите к шагу 18
A


4.READ VALUE OF AIR FUEL RATIO

ПРЕДОСТЕРЕЖЕНИЕ:
Stop the engine immediately if there is white smoke or a fuel smell during the inspection below. Fuel may be leaking from the exhaust fuel addition injector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG).

  1. Turn the tester on.

  1. Start the engine.

  1. Enter the following menu items: Powertrain / Engine and ECT / Data List / AFS B1 S1.

  1. Read the air fuel ratio displayed on the tester after idling the engine for 3 minutes.

    Result:

    Result
    		Proceed to
    Air fuel ratio: More than 12
    		A
    Air fuel ratio: Less than 12
    		B



B
Перейдите к шагу 18
A


5.READ VALUE OF EXHAUST GAS TEMPERATURE

ПРЕДОСТЕРЕЖЕНИЕ:
Stop the engine immediately if there is white smoke or a fuel smell during the inspection below. Fuel may be leaking from the exhaust fuel addition injector.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG).

  1. Turn the tester on.

  1. Start the engine.

  1. Enter the following menu items: Powertrain / Engine and ECT / Data List / Initial Exhaust Temp (In) and Initial Exhaust Temp (Out).

  1. Check that exhaust gas temperature is within the specification below.

    Result:

    Result
    		Exhaust Gas Temperature (°C)
    Idling after warming up engine
    		Constant at approximately 50 to 700°C (122 to 1292°F)



NG
GO TO DTC P0544, P0545, P0546, P2301, P2302, AND P2033 (RELATED TO EXHAUST GAS TEMPERATURE SENSOR)
OK


6.READ VALUE OF AIR FUEL RATIO

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG).

  1. Turn the tester on.

  1. Start the engine.

  1. Enter the following menu items: Powertrain / Engine and ECT / Data List / AFS B1 S1.

  1. After warming up the engine, check if the air fuel ratio varies when accelerating the engine from idling to 3000 rpm by fully depressing the accelerator pedal 3 times.

    Result:

    Result
    		Proceed to
    Air fuel ratio: Varies
    		OK
    Air fuel ratio: Does not vary once
    		NG



NG
GO TO DTC P2237, P2238, AND P2239 (RELATED TO AIR FUEL RATIO SENSOR)
OK


7.INSPECT EXHAUST FUEL ADDITION INJECTOR ASSEMBLY


    A160886E01

  1. Disconnect the exhaust fuel addition injector connector.

  1. 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)
    		7.1 to 7.9 Ω

  1. Reconnect the exhaust fuel addition injector connector.



NG
REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY (Нажмите здесь)
OK


8.CHECK FUSE (EFI NO. 2 FUSE)


    A160312E01

  1. Remove the EFI No. 2 fuse from the engine room relay block.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    EFI No. 2 fuse
    		Always
    		Below 1 Ω

  1. Reinstall the EFI No. 2 fuse.



NG
REPLACE FUSE (EFI NO. 2 FUSE)
OK


9.CHECK HARNESS AND CONNECTOR (EXHAUST FUEL ADDITION INJECTOR ASSEMBLY - ECM)


    A158097E01

  1. Disconnect the exhaust fuel addition injector assembly connector.

  1. Disconnect the ECM connector.

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

    Standard resistance (Check for open):
    Tester Connection
    		Condition
    		Specified Condition
    B52-1 (FIV) - B31-105 (FIV)
    		Always
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Condition
    		Specified Condition
    B52-1 (FIV) or B31-105 (FIV) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the exhaust fuel addition injector assembly connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (EXHAUST FUEL ADDITION INJECTOR ASSEMBLY - ECM)
OK


10.CHECK HARNESS AND CONNECTOR (EXHAUST FUEL ADDITION INJECTOR ASSEMBLY - EFI MAIN RELAY)


    A142932E01

  1. Disconnect the exhaust fuel addition injector assembly connector.

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the integration relay connector.

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

    Standard resistance (Check for open):
    Tester Connection
    		Condition
    		Specified Condition
    B52-2 (+B) - 1B-4
    		Always
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Condition
    		Specified Condition
    B52-2 (+B) or 1B-4 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the exhaust fuel addition injector connector.

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (EXHAUST FUEL ADDITION INJECTOR ASSEMBLY - EFI MAIN RELAY)
OK


11.INSPECT FOR FUEL LEAK (IN EXHAUST FUEL ADDITION INJECTOR)

  1. Visually check if there is a fuel leak between the supply pump and exhaust fuel addition injector.

    OK:
    No leakage

    УКАЗАНИЕ:
    1. Primary pressure of maximum 1 MPa (10 kgf/cm2, 145 psi) is provided from a feed pump inside the supply pump to the exhaust fuel addition injector.
    2. Fuel leaks are possible inside the components (supply pump, etc).



NG
REPAIR OR REPLACE FUEL LEAKAGE POINT
OK


12.READ VALUE OF INJECTION VOLUME (COMPENSATION OF INJECTION VOLUME)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG).

  1. Turn the tester on.

  1. Start the engine.

  1. Enter the following menu items: Powertrain / Engine and ECT / Data List / Injection Feedback Value.

  1. Read the value.

    Result:

    Result
    		Proceed to
    Compensatory injection volume is more than 3.0 mm3 (0.00018 cu.in.)
    		A
    Compensatory injection volume is 3.0 mm3 (0.00018 cu.in.) or less
    		B

    УКАЗАНИЕ:
    Usually compensation injection volume is 3.0 mm3 (0.00018 cu.in.) or less.



B
Перейдите к шагу 14
A


13.CHECK ENGINE COMPONENT PARTS

  1. Check that there is no abnormality in the main injector, cylinder compression pressure, valve timing, and valve clearance.

  1. Check that there is no leakage or blockage in the air intake, exhaust, and EGR systems.

    OK:
    No abnormality in the component parts.



NG
REPAIR OR REPLACE MALFUNCTIONING PART
OK


14.INSPECT EXHAUST FUEL ADDITION INJECTOR (INJECTION VOLUME)


    A094588E05

  1. Remove the exhaust fuel addition injector.

  1. Attach the exhaust fuel addition injector to a nozzle tester.

SST
09268-31012   (95336-08070)
09268-45014   (09268-41220)
09268-41150  

  1. Apply a pressure of 0.29 MPa (3.0 kgf/cm2, 42 psi) to the nozzle tester.

  1. Connect SST (wire) to the exhaust fuel addition injector.

SST
09842-30080  

  1. Inspect the injector.

    Standard:
    Condition
    		Result
    Leave the injector undisturbed for 1 minute with fuel pressurized
    		No leakage from the injector
    Apply battery voltage to the injector
    		Fuel is emitted from the injector

    УКАЗАНИЕ:
    1. Injection volume after leaving the exhaust fuel addition injector for 10 seconds with the pressurized fuel applied is as follows:

      Reference:
      25 cm3 (1.5 cu.in.)

    2. The above is a reference value, thus, your reading may differ from this value depending on the measuring conditions, etc.
    3. Check that the nozzle of the exhaust fuel addition injector is not clogged.

  1. Reinstall the exhaust fuel addition injector.



NG
REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY (Нажмите здесь)
OK


15.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (DPNR CATALYST REGENERATION)

  1. Clear the learning value by removing the negative battery cable for more than 1 minute.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG).

  1. Turn the tester on.

  1. Enter the following menu items: Powertrain / Engine and ECT / Active Test / Activate the DPF Rejuvenate (PM).

  1. After warming up the engine, drive the vehicle at a constant speed between 50 and 100 km/h (31 and 62 mph) (with smooth throttle operations) for more than 15 minutes.

  1. Enter the following menus: "Powertrain / Engine and ECT / Data List / AFS B1 S1, Initial Exhaust Temp (In), Initial Exhaust Temp (Out) and Exhaust Fuel Addition FB".

  1. Check the exhaust gas temperatures (Initial Exhaust Temp (In) and (Out)) and the learning value (Exhaust Fuel Addition FB).

    Result:

    Result
    		Proceed to
    Exhaust gas temperature does not become higher than 600°C (1112°F)
    		A
    Exhaust gas temperature becomes higher than 600°C (1112°F), and the learning value remains in the vicinity of 1.0
    		B



B
CHECK FOR INTERMITTENT PROBLEMS (Нажмите здесь)
A


16.REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY

  1. Replace the exhaust fuel addition injector assembly (See page Нажмите здесь).


NEXT


17.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (DPNR CATALYST REGENERATION)

  1. Clear the learning value by removing the negative battery cable for more than 1 minute.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG).

  1. Turn the tester on.

  1. Enter the following menu items: Powertrain / Engine and ECT / Active Test / Activate the DPF Rejuvenate (PM).

  1. After warming up the engine, drive the vehicle at a constant speed between 50 and 100 km/h (31 and 62 mph) (with smooth throttle operations) for more than 15 minutes.

  1. Enter the following menu items: Powertrain / Engine and ECT / Data List / AFS B1 S1, Initial Exhaust Temp (In), Initial Exhaust Temp (Out) and Exhaust Fuel Addition FB.

  1. Check the exhaust gas temperatures (Initial Exhaust Temp (In) and (Out)) and the learning value (Exhaust Fuel Addition FB).

    Result:

    Result
    		Proceed to
    Exhaust gas temperature does not become higher than 600°C (1112°F)
    		A
    Exhaust gas temperature becomes higher than 600°C (1112°F), and the learning value remains in the vicinity of 1.0
    		B



B
END
A

REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (Нажмите здесь)  

18.INSPECT EXHAUST FUEL ADDITION INJECTOR (INJECTION VOLUME)


    A094588E05

  1. Remove the exhaust fuel addition injector.

  1. Attach the exhaust fuel addition injector to a nozzle tester.

SST
09268-31012   (95336-08070)
09268-45014   (09268-41220)
09268-41150  

  1. Apply a pressure of 0.29 MPa (3.0 kgf/cm2, 42 psi) to the nozzle tester.

  1. Connect SST (Wire) to the exhaust fuel addition injector.

SST
09842-30080  

  1. Inspect the injector.

    Standard:
    Condition
    		Result
    Leave the injector undisturbed for 1 minute with fuel pressurized
    		No leakage from the injector
    Apply battery voltage to the injector
    		Fuel is emitted from the injector

    УКАЗАНИЕ:
    1. Injection volume after leaving the exhaust fuel addition injector for 10 seconds with the pressurized fuel applied as follows:

      Reference:
      25 cm3 (1.5 cu.in.)

    2. The above is a reference value, thus, your reading may differ from this value depending on the measuring conditions, etc.
    3. Check that the nozzle of the exhaust fuel addition injector is not clogged.

  1. Reinstall the exhaust fuel addition injector.



NG
REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY (Нажмите здесь)
OK

GO TO DTC P1238 (RELATED MAIN INJECTOR) 

































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