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 .

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

Fig 1: Identifying CONSULT-II SELF DIAGNOSIS Screen
Courtesy of NISSAN MOTOR CO., U.S.A.

NOTE: In rare case, "CHAIN OF ECM-IMMU" might be stored during key registration procedure, even if the system is not malfunctioning.

Is CONSULT-II screen displayed as above?
1. Yes: GO TO 2.
2. No: GO TO SYMPTOM MATRIX CHART 1 .
CHECK POWER SUPPLY CIRCUIT FOR BCM
1. Disconnect BCM.
2. Check voltage between BCM connector M20 terminal 70 and ground.
  
  Fig 2: Checking Voltage Between BCM Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  70 (W/B) - Ground: Battery voltage
OK or NG
1. OK: GO TO 3.
2. 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 connector
    Ref. Part No. C1
CHECK IGN SW. ON SIGNAL
1. Turn ignition switch ON.
2. Check voltage between BCM connector M18 terminal 38 and ground.
  
  Fig 3: Checking Voltage Between BCM Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  38 (W/L) - Ground: Battery voltage
OK or NG
1. OK: GO TO 4.
2. NG: Check the following.
  - 10A fuse [No. 59, located in the fuse and relay box]
  - Harness for open or short between fuse and BCM connector
    Ref. part No. C2
CHECK GROUND CIRCUIT FOR BCM
1. Turn ignition OFF.
2. Check continuity between BCM connector M18 terminal 67 and ground.
  
  Fig 4: Checking Continuity Between BCM Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  67 (B) - Ground: Continuity should exist.
OK or NG
1. OK: GO TO 5.
2. NG: Repair or replace harness. Ref. part No. C3
REPLACE BCM
1. Replace BCM. Ref. part No. A
2. Perform initialization with CONSULT-II.
  For initialization, refer to "CONSULT-II Operation Manual NATS-IVIS/NVIS".
Does the engine start?
1. Yes: BCM is malfunctioning.
2. No: ECM is malfunctioning.
  - Replace ECM. Ref. part No. B
  - 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 .