Diagnostic Procedure 2

Self-diagnostic results: 

"CHAIN OF ECM-IMMU" is display on CONSULT-II screen 

Firs.  perform the "SELF-DIAG RESULTS" in "BCM" with CONSULT-II, then perform the trouble diagnosis of malfunction system indicated "SELF-DIAG RESULTS" of "BCM". Refer to "CAN COMMUNICATION INSPECTION USING CONSULT-II (SELF-DIAGNOSIS) ".

1. CONFIRM SELF-DIAGNOSTIC RESULTS 

   Confirm that SELF-DIAGNOSTIC RESULTS "CHAIN OF ECM IMMU" is displayed on the screen?

   Does CONSULT-II screen display as shown in figure? 

   YES : GO TO 2.

   NO : GO TO "TROUBLE DIAGNOSIS SYMPTOM CHART ".

   Fig 1: CONSULT-II DISPLAY - "CHAIN OF ECM IMMU"

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK POWER SUPPLY CIRCUIT FOR BCM 
   1. Turn ignition switch OFF.
   2. Disconnect BCM connector M4.
   3. Check voltage between BCM connector M4 terminals and ground.

      42 (L/R) - Ground : Battery voltage 

      55 (G) - Ground : Battery voltage 

   OK or NG 

   OK : GO TO 3.

   NG : Check the following.

   • 50A fusible link [Letter M  , located in fuse block (J/B)]
   • 15A fuse [No.22, located in fuse block (J/B)]
   • Harness for open or short between fusible link or fuse and BCM.
     Fig 2: Identifying Voltage Between BCM Connector M4 Terminals And Ground

     Courtesy of NISSAN MOTOR CO., U.S.A.
3. CHECK IGNITION SWITCH ON SIGNAL 
   1. Turn ignition switch ON.
   2. Check voltage between BCM connector M3 terminal and ground.

      38 (W/L) - Ground : Battery voltage 

   OK or NG 

   OK : GO TO 4.

   NG : Check the following.

   • 15A fuse [No.1, located in fuse block (J/B)]
   • Harness for open or short between fuse and BCM.
     Fig 3: Identifying Voltage Between BCM Connector M3 Terminal And Ground

     Courtesy of NISSAN MOTOR CO., U.S.A.
4. CHECK GROUND CIRCUIT FOR BCM 
   1. Turn ignition switch OFF.
   2. Check continuity between BCM connector M4 terminals 49 (B), 52 (B) and ground.

      49 (B) - Ground : Continuity should exist. 

      52 (B) - Ground : Continuity should exist. 

   OK or NG 

   OK : GO TO 5.

   NG : Repair or replace harness between BCM and ground.

   Fig 4: Identifying Continuity Between BCM Connector M4 Terminals 49 (B), 52 (B) And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
5. REPLACE BCM 
   1. Replace BCM.
   2. Perform initialization with CONSULT-II.

   Does the engine start? 

   YES : BCM is malfunctioning.

   • Replace BCM.
   • Perform initialization with CONSULT-II.

   NO : ECM is malfunctioning.

   • Replace ECM.
   • Perform initialization or re-communicating function.
     • For re-communicating function, refer to "ECM Re-Communicating Function ".