Nissan Rogue (T33) 2021-Present Service Manual: 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.
-
Turn ignition switch OFF and wait at least 10 seconds.
-
Turn ignition switch ON.
-
Turn ignition switch OFF and wait at least 10 seconds.
>>
GO TO 2.
CHECK DTC PRIORITY
-
Turn ignition ON and wait at least 10 seconds.
-
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
-
Turn ignition switch OFF.
-
Disconnect ECM harness connector and active grille shutter harness connector.
-
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 -
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
-
Disconnect EVAP canister electric purge pump harness connector.
-
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 -
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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