Nissan Murano: Dtc/circuit Diagnosis / U1044 Eng Comm Circuit

DTC Description

DTC DETECTION LOGIC

A signal voltage of LIN communication between ECM and generator is excessively low or excessively high.

POSSIBLE CAUSE

• Harness or connectors

  (LIN communication circuit is open or shorted.)

• Generator

FAIL-SAFE

Not applicable

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.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition ON and wait at least 10 seconds.

2. Check DTC.

Is DTC detected?

Proceed to Diagnosis Procedure.

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

Confirmation after repair: INSPECTION END

CHECK ACTIVE GRILLE SHUTTER SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect active grille shutter harness connector.

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

   +		−		Continuity
   ECM		Active grille shutter
   Connector	Terminal	Connector	Terminal
   F79	99	E238	3	Existed

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

Is the inspection result normal?

INSPECTION END

Repair or replace error-detected parts.