DESCRIPTION
The EDU delivers drive signals to fuel injectors using the DC/DC converter, which provides a high-voltage and quick-charging system.
Soon after the EDU receives a fuel injection command (IJT) signal from the ECM, the EDU responds to the command with an injector injection confirmation (IJF) signal when the current is applied to the fuel injector.
DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
---|---|---|
Idling for 5 seconds | Open or short in the injector driver (EDU) or fuel injector circuit. (1 trip detection logic) |
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MONITOR DESCRIPTION
P062D (Open or short in EDU or fuel injector circuit):The ECM continuously monitors both injection command (IJT) signals and injection confirmation (IJF) signals. This DTC will be stored if the ECM determines that the number of IJT signals and IJF signals are inconsistent.
The fuel injectors are grounded over a Field Effect Transistor (FET) and a serial resistor. This resistor creates a voltage drop, which is monitored by the EDU (injector drive circuit) in relation to the current drawn by the fuel injector. When the fuel injector current becomes too high, the voltage drop over the resistor exceeds a specified level and no IJF signal for that cylinder is sent to the ECM.
After the engine is started, when there is no injection confirmation (IJF) signal from the EDU to the ECM even though the ECM sends injection command (IJT) signals to the 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
INSPECTION PROCEDURE
Note
After replacing the ECM, the new ECM needs registration Click here and initialization Click here.
After replacing a fuel injector, 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 | Proceed to |
---|---|
Engine does not start | A |
Engine starts, but idling is rough | B |
Except above | C |
Tech Tips
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 "Fuel Press" is higher than the value for "Target Common Rail Pressure"
B |
READ VALUE USING INTELLIGENT TESTER (INJECTION FEEDBACK VAL #1 to #4) Click here |
C |
CHECK FOR INTERMITTENT PROBLEMS Click here |
A |
INSPECT ECM
*1 | Front view of wire harness connector (to Injector Driver (EDU)) |
Disconnect the injector driver (EDU) connectors.
Check the waveform of the injector driver (EDU) connectors using an oscilloscope.
OK | |||||||||||||||
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NG |
CHECK HARNESS AND CONNECTOR (EDU - ECM) Click here |
OK |
CHECK TERMINAL VOLTAGE EDU POWER SOURCE
*1 | Front view of wire harness connector (to Injector Driver (EDU)) |
Disconnect the injector driver (EDU) connectors.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
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Reconnect the injector driver (EDU) connectors.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR Click here |
OK |
CHECK HARNESS AND CONNECTOR (EDU - ECM)
*1 | Front view of wire harness connector (to Injector Driver (EDU)) |
*2 | Front view of wire harness connector (to ECM) |
Disconnect the EDU connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open) | ||||||||||||||||||
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Standard Resistance (Check for Short) | ||||||||||||||||||
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Reconnect the EDU connector.
Reconnect the ECM connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR Click here |
OK |
REPLACE EDU
Replace the EDU Click here.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here |
READ VALUE USING INTELLIGENT TESTER (INJECTION FEEDBACK VAL #1 to #4)
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Injection Feedback Val #1 to #4.
Start the engine.
Read the Injection Feedback Val #1 to #4 values while idling the engine.
Standard Value | ||||||
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Tech Tips
*: The A/C switch and all accessory switches should be off, and the engine should be fully warmed up.
Fuel is not being injected in cylinders whose "Injection Feedback Val" is higher than 3 mm3/st. Inspection procedures beyond this point diagnose whether there are internal problems with fuel injectors, or whether there is a problem in the wiring of the fuel injector system.
NEXT |
INSPECT EDU
*1 | Front view of wire harness connector (to Injector) |
Disconnect the fuel injector 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.
Check the waveform of the fuel injector connectors using an oscilloscope.
OK | |||||||||||||||
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NG |
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - EDU) Click here |
OK |
REPLACE FUEL INJECTOR OF MALFUNCTIONING CYLINDER
Replace the fuel injector of the malfunctioning cylinder Click here.
NEXT |
BLEED AIR FROM FUEL SYSTEM
Bleed the air from the fuel system Click here.
NEXT |
REGISTER INJECTOR COMPENSATION CODE AND PERFORM PILOT QUANTITY LEARNING
Register the injector compensation code Click here.
Perform the fuel injector pilot quantity learning Click here.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here |
CHECK HARNESS AND CONNECTOR (EDU - ECM)
*1 | Front view of wire harness connector (to Injector Driver (EDU)) |
*2 | Front view of wire harness connector (to ECM) |
Disconnect the EDU connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open) | ||||||||||||||||||
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Standard Resistance (Check for Short) | ||||||||||||||||||
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Reconnect the EDU connector.
Reconnect the ECM connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR Click here |
OK |
REPLACE ECM
Replace the ECM Click here.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here |
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - EDU)
*1 | Front view of wire harness connector (to Injector) |
*2 | Front view of wire harness connector (to Injector Driver (EDU)) |
*3 | Front view of wire harness connector (to Injector Driver (EDU)) |
Disconnect the fuel injector connectors.
Disconnect the EDU connectors.
Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open) | |||||||||||||||||||||||||||
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Standard Resistance (Check for Short) | |||||||||||||||||||||||||||
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Reconnect the fuel injector connectors.
Reconnect the EDU connectors.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR Click here |
OK |
REPLACE EDU
Replace the EDU Click here.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here |
REPAIR OR REPLACE HARNESS OR CONNECTOR
Repair or replace the harness or connector.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Connect the intelligent tester to the DLC3.
Clear the DTCs Click here.
Turn the ignition switch off for 30 seconds or more.
Start the engine and idle it for 10 seconds.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Confirm that the DTC is not output again.
NEXT |
END