Nissan Rogue (T33) 2021-Present Service Manual: U0644 Sent Communication

Nissan Rogue (T33) 2021-Present Service Manual / Engine :: Engine Control System / Kr15ddt :: Dtc/circuit Diagnosis / U0644 Sent Communication

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content) 		DTC detecting condition
U0644 00

Lost comm with w/g posi sen (b1)

(Lost Communication With Wastegate Position Sensor "A") 		Diagnosis condition

  • Battery voltage: 8 V or more

  • Ignition switch: ON
Signal (terminal) wastegate control valve position sensor signal
Threshold ECM detects engine communication error
Diagnosis delay time —

POSSIBLE CAUSE

  • Harness or connectors

    (Wastegate control valve position sensor circuit is open.)

  • Wastegate control valve position sensor

    (Electric wastegate control actuator)

FAIL-SAFE

Engine Control System

Fail safe mode Nissan Ariya Vehicle behavior
Traveling control mode Engine output control

ECM reduces the engine output, according to the rise in engine speed. This reduces the Nissan Ariya vehicle speed to encourage the driver to repair malfunction.

  • Driving at 70 km/h (44 MPH) or more is possible.

NOTE:

This value is a reference value converted from engine power to Nissan Ariya vehicle speed. Actual power limitation value differs due to the malfunctioning part and driving condition.
Device fix mode

  • This mode fixes the electric IVT control actuator and the EVT control solenoid valve in the reference position.

  • A control signals is not transmitted to the EGR volume control valve and the EGR volume control is deactivated.

Stop/Start System

Not applicable

DTC Confirmation Procedure

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

  1. Turn ignition switch OFF and wait at least 10 seconds.

  2. Turn ignition switch ON.

  3. Turn ignition switch OFF and wait at least 10 seconds.

>>

GO TO 2 .

CHECK DTC PRIORITY

  1. Turn ignition ON.

  2. Check DTC.

Is DTC detected?

YES>>

Proceed to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

CHECK WASTEGATE CONTROL VALVE POSITION SENSOR POWER SUPPLY

  1. Turn ignition switch OFF.

  2. Disconnect electric wastegate control actuator harness connector.

  3. Turn ignition switch ON.

  4. Check the voltage between electric wastegate control actuator harness connector and ground

    + −

    Voltage

    (Approx.)
    Electric wastegate control actuator
    Connector Terminal
    F95 4 Ground Battery voltage

Is the inspection result normal?

YES>>

GO TO 2 .

NO>>

Perform the trouble diagnosis for power supply circuit.

CHECK WASTEGATE CONTROL VALVE POSITION SENSOR GROUND CIRCUIT

  1. Turn ignition switch OFF.

  2. Disconnect ECM harness connector.

  3. Check the continuity between electric wastegate control actuator harness connector and ECM harness connector.

    Electric wastegate control actuator ECM Continuity
    Connector Terminal Connector Terminal
    F95 2 F71 111 Existed

  4. Also check harness for short to power.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace error-detected parts.

CHECK WASTEGATE CONTROL VALVE POSITION SENSOR SIGNAL CIRCUIT

  1. Check the continuity between electric wastegate control actuator harness connector and ECM harness connector.

    Electric wastegate control actuator ECM Continuity
    Connector Terminal Connector Terminal
    F95 3 F71 75 Existed

  2. Also check harness for short to ground and to power.

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace error-detected parts.

CHECK ELECTRIC WASTEGATE CONTROL ACTUATOR

Check electric wastegate control actuator. Refer to Component Inspection.

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Repair or replace error-detected parts.

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