ECD SYSTEM(for DPF), Diagnostic DTC:P0201, P0202, P0203, P0204, P062D

DTC Code	DTC Name
P0201	Injector Circuit / Open - (Cylinder 1)
P0202	Injector Circuit / Open - (Cylinder 2)
P0203	Injector Circuit / Open - (Cylinder 3)
P0204	Injector Circuit / Open - (Cylinder 4)
P062D	No. 1 Fuel Injector Driver Circuit Performance

DESCRIPTION

The injector driver (EDU) delivers drive signals to fuel injectors using the DC/DC converter, which provides a high-voltage and quick-charging system.

Soon after the injector driver (EDU) receives a fuel injection command (#1 to #4) signal from the ECM, the injector driver (EDU) responds to the command with an injector injection confirmation (INJF) signal when the current is applied to the injector assembly.

P0201, P0202, P0203, P0204:
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Idling for 5 seconds	Open or short in injector circuit occurs a certain number of times (a maximum of approx. 0.5 seconds). (1 trip detection logic)	Open or short in injector assembly circuit Injector assembly Injector driver (EDU) ECM

P062D
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Idling for 5 seconds	Inconsistency in the injection waveforms between the injector driver (EDU) and ECM while the engine is running a certain number of times (a maximum of approx. 0.5 seconds). (1 trip detection logic)	Open or short in injector driver (EDU) circuit Injector assembly Injector driver (EDU) ECM

MONITOR DESCRIPTION

P0201, P0202, P0203, P0204:
The ECM compares injection command (# 1 to # 4) signals and injection confirmation (INJF) signals for each cylinder. If the ECM determines that a cylinder has a malfunction, DTC P0201, P0202, P0203 or P0204 will be stored.

P062D:
The ECM continuously monitors both injection command (#1 to #4) signals and injection confirmation (INJF) signals. This DTC will be stored if the ECM determines that the number of #1 to #4 signals and INJF signals are inconsistent.

The injector assemblies are grounded over a Field Effect Transistor (FET) and a serial resistor. This resistor creates a voltage drop, which is monitored by the injector driver (EDU) (injector drive circuit) in relation to the current drawn by the injector assembly. When the injector assembly current becomes too high, the voltage drop over the resistor exceeds a specified level and no INJF signal for that cylinder is sent to the ECM.

After the engine is started, when there is no injection confirmation (INJF) signal from the injector driver (EDU) to the ECM even though the ECM sends injection command (#1 to #4) signals to the injector driver (EDU), DTC P062D is stored.

If this DTC is stored, the ECM enters fail-safe mode and limits engine power or stops the engine. The fail-safe mode continues until the ignition switch is turned off.

WIRING DIAGRAM


*a	No. 1 Fuel Injector
*b	No. 2 Fuel Injector
*c	No. 3 Fuel Injector
*d	No. 4 Fuel Injector

CAUTION / NOTICE / HINT

CAUTION:

Make sure to perform work on high voltage circuits with the ignition switch off.

Note

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

Tech Tips

Read freeze frame data using the intelligent tester. 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.

PROCEDURE

CHECK ENGINE CRANKING CONDITION

Check the engine cranking condition.

Result
Result	Proceed to
Engine does not start*1	A
Engine starts, but idling is rough*2	B
Except above	C

Tech Tips

*1: Once DTC P062D is cleared, it is not stored again even when the engine does not start due to a malfunction in the injector driver (EDU).

When the engine cannot be started due to a malfunction in the injector driver (EDU), the value for "Common Rail Pressure" is higher than the value for "Target Common Rail Pressure"
*2: DTC P0201, P0202, P0203, P0204 and P062D are stored at this time.

CHECK WHETHER DTC OUTPUT RECURS Click here

CHECK FOR INTERMITTENT PROBLEMS Click here

INSPECT ECM

Text in Illustration

*a
Front view of wire harness connector

(to Injector Driver (EDU))

Disconnect the injector driver (EDU) connectors.

Text in Illustration
*a	Front view of wire harness connector (to Injector Driver (EDU))

Check the waveform of the injector driver (EDU) connectors using an oscilloscope.

Tester Connection	Condition	Specified Condition
B69-7 (#10)- Body ground	Cranking	Correct waveform is as shown
B69-3 (#20) - Body ground	Cranking	Correct waveform is as shown
B69-6 (#30) - Body ground	Cranking	Correct waveform is as shown
B69-4 (#40) - Body ground	Cranking	Correct waveform is as shown

CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER (EDU) - ECM) Click here

CHECK TERMINAL VOLTAGE (POWER SOURCE)

Text in Illustration

*a
Front view of wire harness connector

(to Injector Driver (EDU))

Disconnect the injector driver (EDU) connector.
Turn the ignition switch to ON.

Text in Illustration
*a	Front view of wire harness connector (to Injector Driver (EDU))

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
B68-2 (+B) - B68-4 (GND)	Ignition switch ON	11 to 14 V

Reconnect the injector driver (EDU) connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER (EDU) - ECM)

Disconnect the injector driver (EDU) connector.
Disconnect the ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
B69-7 (#10) - B39-50 (#1)	Always	Below 1 Ω
B69-3 (#20) - B39-49 (#2)	Always	Below 1 Ω
B69-6 (#30) - B39-48 (#3)	Always	Below 1 Ω
B69-4 (#40) - B39-47 (#4)	Always	Below 1 Ω
B69-8 (INJF) - B39-51 (INJF)	Always	Below 1 Ω
B69-7 (#10) or B39-50 (#1) - Body ground	Always	10 kΩ or higher
B69-3 (#20) or B39-49 (#2) - Body ground	Always	10 kΩ or higher
B69-6 (#30) or B39-48 (#3) - Body ground	Always	10 kΩ or higher
B69-4 (#40) or B39-47 (#4) - Body ground	Always	10 kΩ or higher
B69-8 (INJF) or B39-51 (INJF) - Body ground	Always	10 kΩ or higher

Reconnect the injector driver (EDU) connector.
Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

REPLACE INJECTOR DRIVER (EDU)
1. Replace the injector driver (EDU) Click here.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here
CHECK WHETHER DTC OUTPUT RECURS
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to ON and turn the tester on.
3. Clear the DTCs Click here.
4. Turn the ignition switch off for 30 seconds.
5. Start the engine and idle it for 30 seconds.
6. Enter the following menus: Powertrain / Engine and ECT / DTC.
7. Check the DTCs output on the tester.
  Tech Tips
  - The cylinder with the malfunctioning injector assembly can be determined based on the output DTCs.
  - If the DTC P0201 is output, check the No. 1 injector assembly circuit.
  - If the DTC P0202 is output, check the No. 2 injector assembly circuit.
  - If the DTC P0203 is output, check the No. 3 injector assembly circuit.
  - If the DTC P0204 is output, check the No. 4 injector assembly circuit.
NEXT

INSPECT INJECTOR DRIVER (EDU)

Text in Illustration

*a
Front view of wire harness connector

(to Injector Assembly)

Disconnect the injector assembly connectors for all cylinders.

Note

If only the injector assembly connector of the malfunctioning cylinder is disconnected, the engine will start and there will be rough idling. Therefore, disconnect all injector assembly connectors before inspecting the waveform.

Text in Illustration
*a	Front view of wire harness connector (to Injector Assembly)

Check the waveform of the injector assembly connectors using an oscilloscope.

Tester Connection	Condition	Specified Condition
B51-1 - B51-2	Cranking	Voltage increases by 50 V or more
B52-1 - B52-2	Cranking	Voltage increases by 50 V or more
B53-1 - B53-2	Cranking	Voltage increases by 50 V or more
B54-1 - B54-2	Cranking	Voltage increases by 50 V or more

CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - INJECTOR DRIVER (EDU)) Click here

REPLACE INJECTOR ASSEMBLY (RELEVANT CYLINDER)
1. Replace the injector assembly of the cylinder relevant to the DTC Click here.
  Note
  - When replacing the injector assembly for a cylinder, always be sure to use a new injection pipe.
  - Follow the procedure in the repair manual and temporarily install the injection pipes and nozzle leakage pipe, and then correctly position the injector assemblies. After that, tighten parts according to the torque specifications.
  - If the installation procedure is not performed correctly, injector assemblies may become out of position, which may cause the injector assemblies to deteriorate, resulting in malfunctions.
  - If an injector assembly deteriorates and malfunctions, other problems such as knocking, rough idle, etc. may occur.
  - If an injector assembly becomes out of position, it is possible that the seal between the injector assembly and injection pipe may become incomplete, resulting in a fuel leak.
NEXT
BLEED AIR FROM FUEL SYSTEM
1. Bleed the air from the fuel system Click here.
NEXT
REGISTER INJECTOR COMPENSATION CODE AND PERFORM PILOT QUANTITY LEARNING
1. Register the injector compensation code Click here.
2. Perform the injector pilot quantity learning Click here.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER (EDU) - ECM)

Disconnect the injector driver (EDU) connector.
Disconnect the ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
B69-7 (#10) - B39-50 (#1)	Always	Below 1 Ω
B69-3 (#20) - B39-49 (#2)	Always	Below 1 Ω
B69-6 (#30) - B39-48 (#3)	Always	Below 1 Ω
B69-4 (#40) - B39-47 (#4)	Always	Below 1 Ω
B69-8 (INJF) - B39-51 (INJF)	Always	Below 1 Ω
B69-7 (#10) or B39-50 (#1) - Body ground	Always	10 kΩ or higher
B69-3 (#20) or B39-49 (#2) - Body ground	Always	10 kΩ or higher
B69-6 (#30) or B39-48 (#3) - Body ground	Always	10 kΩ or higher
B69-4 (#40) or B39-47 (#4) - Body ground	Always	10 kΩ or higher
B69-8 (INJF) or B39-51 (INJF) - Body ground	Always	10 kΩ or higher

Reconnect the injector driver (EDU) connector.
Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

REPLACE ECM
1. Replace the ECM Click here.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - INJECTOR DRIVER (EDU))

Disconnect the injector assembly connectors.
Disconnect the injector driver (EDU) connectors.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
B51-1 - B71-1 (IJ1+)	Always	Below 1 Ω
B51-2 - B71-4 (IJ1-)	Always	Below 1 Ω
B52-1 - B71-3 (IJ2+)	Always	Below 1 Ω
B52-2 - B71-6 (IJ2-)	Always	Below 1 Ω
B53-1 - B68-1 (IJ3+)	Always	Below 1 Ω
B53-2 - B68-3 (IJ3-)	Always	Below 1 Ω
B54-1 - B71-2 (IJ4+)	Always	Below 1 Ω
B54-2 - B71-5 (IJ4-)	Always	Below 1 Ω
B51-1 or B71-1 (IJ1+) - Body ground	Always	10 kΩ or higher
B51-2 or B71-4 (IJ1-) - Body ground	Always	10 kΩ or higher
B52-1 or B71-3 (IJ2+) - Body ground	Always	10 kΩ or higher
B52-2 or B71-6 (IJ2-) - Body ground	Always	10 kΩ or higher
B53-1 or B68-1 (IJ3+) - Body ground	Always	10 kΩ or higher
B53-2 or B68-3 (IJ3-) - Body ground	Always	10 kΩ or higher
B54-1 or B71-2 (IJ4+) - Body ground	Always	10 kΩ or higher
B54-2 or B71-5 (IJ4-) - Body ground	Always	10 kΩ or higher

Reconnect the injector assembly connectors.
Reconnect the injector driver (EDU) connectors.

REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

REPLACE INJECTOR DRIVER (EDU)
1. Replace the injector driver (EDU) Click here.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here
REPAIR OR REPLACE HARNESS OR CONNECTOR
1. Repair or replace the harness or connector.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester on.
4. Clear the DTCs Click here.
5. Turn the ignition switch off and wait for 30 seconds or more.
6. Start the engine and idle it for 5 seconds or more.
7. Turn the tester on.
8. Enter the following menus: Powertrain / Engine and ECT / DTC.
9. Confirm that the DTC is not output again.
NEXT
END