Nissan Rogue (T33) 2021-Present Service Manual: U1040 Eng Comm Circuit

Nissan Rogue (T33) 2021-Present Service Manual / Engine :: Engine Control System / Kr15ddt :: Dtc/circuit Diagnosis / U1040 Eng Comm Circuit

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content) 		DTC detection condition
U1040 00

ENG COMM CIRCUIT

(Engine communication circuit) 		Diagnosis condition Ignition switch ON
Signal (terminal) Engine communication signal
Threshold ECM unable to transmit engine communication signal to active grille shutter and EVAP canister electric purge pump
Diagnosis delay time 2 seconds or more

POSSIBLE CAUSE

  • Harness or connectors (LIN communication circuit is open or shorted.)

  • Active grille shutter

  • EVAP canister electric purge pump

  • ECM

FAIL-SAFE

Engine Control System

Not applicable

Stop/Start System

When a DTC is detected, the stop/start indicator lamp blinks slowly and the stop/start system operation is prohibited.

When ECM detects error while operating the stop/start system, ECM restarts the engine.

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 and wait at least 10 seconds.

  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 ACTIVE GRILLE SHUTTER SIGNAL CIRCUIT

  1. Turn ignition switch OFF.

  2. Disconnect ECM harness connector and active grille shutter harness connector.

  3. Check the continuity between ECM harness connector and active grille shutter harness connector.

    ECM Active grille shutter Continuity
    Connector Terminal Connector Terminal
    F72 21 E46 3 Existed

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

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace error-detected parts.

CHECK ACTIVE GRILLE SHUTTER

Check the active grille shutter. Refer to Component Inspection.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace error-detected parts and perform DTC CONFIRMATION PROCEDURE again.

CHECK EVAP CANISTER ELECTRIC PURGE PUMP SIGNAL CIRCUIT

  1. Disconnect EVAP canister electric purge pump harness connector.

  2. Check the continuity between ECM harness connector and EVAP canister electric purge pump harness connector.

    ECM EVAP canister electric purge pump Continuity
    Connector Terminal Connector Terminal
    F72 23 F105 4 Existed

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

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace error-detected parts.

CHECK EVAP CANISTER ELECTRIC PURGE PUMP

Check the active grille shutter. Refer to Component Inspection.

Is the inspection result normal?

YES>>

Replace ECM. Refer to ECM : Removal & Installation.

NO>>

Repair or replace error-detected parts and perform DTC CONFIRMATION PROCEDURE again.

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