Diagnostic Procedure 1

Self-diagnostic results: 

"CHAIN OF ECM-IMMU" displayed on CONSULT-II screen

First 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 "CONSULT-II "

1. CONFIRM SELF-DIAGNOSTIC RESULTS 

   Confirm SELF-DIAGNOSTIC RESULTS "CHAIN OF ECM-IMMU" displayed on CONSULT-II screen.

   NOTE: In rare case, "CHAIN OF ECM-IMMU" might be stored during key registration procedure, even if the system is not malfunctioning.
   Fig 1: CONSULT-II Display - SELF DIAGNOSIS

   Courtesy of NISSAN MOTOR CO., U.S.A.

   Is CONSULT-II screen displayed as shown in figure? 

   YES: GO TO 2.

   NO: GO TO "SYMPTOM MATRIX CHART 1 ".

2. CHECK POWER SUPPLY CIRCUIT FOR BCM 
   1. Turn ignition switch OFF.
   2. Disconnect BCM.
   3. Check voltage between BCM connector M20 terminals 57, 70 and ground.

      57 - Ground: Battery voltage 

      70 - Ground: Battery voltage 

   Fig 2: Checking Voltage Between BCM Connector M20 Terminals 57, 70 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   OK: GO TO 3.

   NG: Check the following:

   • 50A fusible link (letter f  , located in fuse and fusible link box)
   • Harness for open or short between fuse and BCM.
   • Harness for open or short between fuse and BCM.
3. CHECK IGN SW. ON SIGNAL 
   1. Turn ignition switch ON.
   2. Check voltage between BCM connector M18 terminal 38 and ground.

      38 - Ground: Battery voltage 

   Fig 3: Checking Voltage Between BCM Connector M18 Terminal 38 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   OK: GO TO 4.

   NG: Check the following:

   • 10A fuse [No. 1, located in the fuse block (J/B)]
   • Harness for open or short between fuse and BCM.
4. CHECK GROUND CIRCUIT FOR BCM 
   1. Turn ignition switch OFF.
   2. Check continuity between BCM connector M20 terminal 67 and ground.

      67 - Ground: Continuity should exist. 

   Fig 4: Checking Continuity Between BCM Connector M18 Terminal 67 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   OK: GO TO 5.

   NG: Repair or replace harness.

5. REPLACE BCM 
   1. Replace BCM. Refer to "BCM ".
   2. Perform initialization with CONSULT-II.

      For initialization, refer to "CONSULT-II Operation Manual NATS-IVIS/NVIS".

   Does the engine start? 

   YES: BCM is malfunctioning.

   • Replace BCM.
   • For initialization, refer to "CONSULT-II Operation Manual NATS-IVIS/NVIS".
   • For re-communicating function, refer to "ECM RE-COMMUNICATING FUNCTION ".

   NO: ECM is malfunctioning.

   • Replace ECM.
   • Perform initialization or re-communicating function.
   • For initialization, refer to "CONSULT-II Operation Manual NATS-IVIS/NVIS".
   • For re-communicating function, refer to "ECM RE-COMMUNICATING FUNCTION ".