1Vd-Ftv Engine Control. Dtc P20Cd Open In Exhaust Aftertreatment Fuel Injector A Control Circuit

The exhaust fuel addition injector assembly is mounted on the exhaust port of the cylinder head, and low pressure fuel is supplied to the injector assembly by the feed pump in the fuel supply pump assembly. This injector adds fuel according to a control signal from the ECM.
This injector assembly is used for two different controls: PM forced regeneration and PM reduction.
During PM forced regeneration, the injector adds fuel to raise the catalyst temperature.
In the other control, the injector helps the air-fuel ratio become rich. As a result, PM in the exhaust gas will be reduced in response to the rich air-fuel ratio.

HINT:

For more information on the exhaust fuel addition injector assembly and DPF, refer to the following procedures (Click here).
If P20CD or P20D3 is present, refer to the DTC table for Diesel Particulate Filter System (Click here).

P20CD (Bank 1), P20D3 (Bank 2)
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 3 seconds	With the exhaust fuel addition injector off, the FIVO or FIVO2 output is high for 3 seconds. (1 trip detection logic)	Open in exhaust fuel addition injector assembly circuit Exhaust fuel addition injector assembly ECM

HINT:

DTC P200C, P200D, P20CF or P20D5 will be present if there is an open malfunction in the exhaust fuel addition injector circuit.

MONITOR DESCRIPTION

In order to detect abnormality in the fuel addition injector assembly, an internal CPU of the ECM monitors injection command (FIV and FIV2) signals and injection confirmation (FIVO and FIVO2) signals. The FIV and FIV2 signals are sent from the CPU to the exhaust fuel addition injector assembly via a drive circuit inside the ECM. The FIVO and FIVO2 signals, which are originally output current from the internal drive circuit of the ECM, are transmitted to the CPU via a monitor circuit. By receiving the FIVO and FIVO2 signals, the ECM judges that current has been applied to the exhaust fuel addition injector assembly.
These DTCs will be set if the ECM judges that the number of signals of the FIV and FIV2, and the FIVO and FIVO2 are inconsistent.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses of circuits related to this system before performing the following inspection procedure.
After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).
After replacing the fuel supply pump assembly, the ECM needs initialization (Click here).
After replacing an injector assembly, the ECM needs registration (Click here).

HINT:

Read freeze frame data using the GTS. 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, and other data from the time the malfunction occurred.

1.INSPECT EXHAUST FUEL ADDITION INJECTOR ASSEMBLY (RESISTANCE)

Inspect the exhaust fuel addition injector assembly (for bank 1 or bank 2) (Click here).

Go to step 5

OK

2.CHECK TERMINAL VOLTAGE (POWER SOURCE)

Disconnect the exhaust fuel addition injector assembly connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
C160-2 (+B)- Body ground
Ignition switch ON
11 to 14 V
C161-2 (+B)- Body ground
Ignition switch ON
11 to 14 V
Text in Illustration
*A
for Bank 1
*B
for Bank 2
*a
Front view of wire harness connector
(to Exhaust Fuel Addition Injector Assembly)

Text in Illustration
*A	for Bank 1
*B	for Bank 2
*a	Front view of wire harness connector (to Exhaust Fuel Addition Injector Assembly)

Reconnect the exhaust fuel addition injector assembly connector.

Go to step 7

OK

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

Disconnect the exhaust fuel addition injector assembly connector.

Disconnect the ECM connector.

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

Standard Resistance:

for LHD
Tester Connection	Condition	Specified Condition
C160-1 (FIV)- C45-83 (FIV)	Always	Below 1 Ω
C161-1 (FIV2) - C45-84 (FIV2)	Always	Below 1 Ω
C160-1 (FIV) or C45-83 (FIV) - Body ground	Always	10 kΩ or higher
C161-1 (FIV2) or C45-84 (FIV2) - Body ground	Always	10 kΩ or higher

Standard Resistance:

for RHD
Tester Connection	Condition	Specified Condition
C160-1 (FIV) - C46-83 (FIV)	Always	Below 1 Ω
C161-1 (FIV2) - C46-84 (FIV2)	Always	Below 1 Ω
C160-1 (FIV) or C46-83 (FIV) - Body ground	Always	10 kΩ or higher
C161-1 (FIV2) or C46-84 (FIV2) - Body ground	Always	10 kΩ or higher

Reconnect the exhaust fuel addition injector assembly connector.

Reconnect the ECM connector.

Go to step 7

OK

4.REPLACE ECM

Replace the ECM (Click here).

Go to step 8

5.REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY

When DTC P20CD is output:
Replace the exhaust fuel addition injector assembly (for bank 1) (Click here).

When DTC P20D3 is output:
Replace the exhaust fuel addition injector assembly (for bank 2) (Click here).

NEXT

6.PERFORM PM FORCED REGENERATION

Connect the GTS to the DLC3.

Turn the ignition switch to ON and turn the GTS on.

Clear the DTCs (Click here).

Perform PM forced regeneration (Click here).
HINT:
When the exhaust fuel addition injector assembly is replaced, air may enter the fuel lines, leading to engine starting trouble. Therefore, perform forced regeneration and bleed the air from the fuel lines.

Go to step 8

7.REPAIR OR REPLACE HARNESS OR CONNECTOR

HINT:

If the voltage at the exhaust fuel addition injector assembly connector is not 11 to 14 V, repair or replace the harness and connector between the exhaust fuel addition injector assembly and EFI MAIN 2 relay (including the EFI No. 2 and EFI No. 3 fuses).

Repair or replace the harness or connector.

NEXT

8.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.

Clear the DTCs (Click here).

Drive the vehicle for 20 minutes.
HINT:
The exhaust gas temperature increases to 250°C (482°F) or higher after driving the vehicle for 20 minutes.

Enter the following menus: Engine and ECT / Trouble Codes.

Confirm that the DTC is not output again.

END

Tester Connection	Switch Condition	Specified Condition
C160-2 (+B)- Body ground	Ignition switch ON	11 to 14 V
C161-2 (+B)- Body ground	Ignition switch ON	11 to 14 V