DTC    P2047    Reductant Injector Circuit / Open (Bank 1 Unit 1)

DTC    P2048    Short to GND in Reductant Injector Circuit (Bank 1)

DTC    P2049    Short to B+ in Reductant Injector Circuit (Bank 1)

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 P2047, P2048 and P2049 are present, refer to the DTC table for TOYOTA D-CAT (See page Нажмите здесь).
*1: Diesel Clean Advanced Technology


DTC No.
DTC Detection Condition
Trouble Area
P2047
With the exhaust fuel addition injector off, the FIVM1 output is high and the FIVM2 output is low for 3 seconds.
(1-trip detection logic)
  1. Open in exhaust fuel addition injector circuit
  2. Exhaust fuel addition injector
  3. ECM
P2048
With the exhaust fuel addition injector off, the FIVM1 output is high and the FIVM2 output is high for 0.16 seconds.
(1-trip detection logic)
P2049
With the exhaust fuel addition injector on, the FIVM1 output is low and the FIVM2 output is low for 7 or more times.
(1-trip detection logic)

УКАЗАНИЕ:
DTC P1386 (injector for exhaust fuel addition) will be present if there is an open in the exhaust fuel addition injector circuit.


MONITOR DESCRIPTION

In order to detect abnormality in the fuel addition injector, an internal CPU of the ECM monitors injection command (FIV) signals and injection confirmation (FIVM) signals. The FIV signal is sent from the CPU to the (exhaust) fuel addition injector via a drive circuit inside the ECM. The FIVM signal, which is originally output current from the internal drive circuit of the ECM, is transmitted to the CPU via a monitor circuit. By receiving the FIVM signal, the ECM judges that the current has been applied to the (exhaust) fuel addition injector.
This DTC will be set if the ECM judges that the number of signals of the FIV and the FIVM are inconsistent.

A160564E01


WIRING DIAGRAM


A160322E01


INSPECTION PROCEDURE

ПРИМЕЧАНИЕ:
After replacing the ECM, the new ECM needs registration (See page Нажмите здесь) and initialization (See page Нажмите здесь).

УКАЗАНИЕ:
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.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


2.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


3.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


4.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 assembly 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

REPLACE ECM (Нажмите здесь)  

































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