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.

   Is CONSULT-II screen displayed as above? 

   Yes: GO TO 2.

   No: GO TO "SYMPTOM MATRIX CHART 1 ".

   Fig 1: Identifying CONSULT-II Display - SELF-DIAGNOSTIC RESULTS

   
2. CHECK POWER SUPPLY CIRCUIT FOR BCM 
   1. Turn ignition switch OFF.
   2. Check voltage between BCM connector M20 terminal 70 and ground.

      70 - Ground : Battery voltage 

   OK or NG 

   OK: GO TO 3.

   NG: Check the following:

   • 50A fusible link (letter g, located in fuse and fusible link box)
   • Harness for open or short between fuse and BCM connector

     Ref. Part No. C1 

     Fig 2: Checking Voltage Between BCM Connector M20 Terminal 70 And Ground

     
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 

   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 connector

     Ref. part No. C2 

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

     
4. CHECK GROUND CIRCUIT FOR BCM 
   1. Turn ignition switch OFF.
   2. Disconnect BCM.
   3. Check continuity between BCM connector M20 terminal 67 and ground.

      67 - Ground: Continuity should exist. 

   OK or NG 

   OK: GO TO 5.

   NG: Repair or replace harness. Ref. part No. C3 

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

   
5. 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? 

   Yes: BCM is malfunctioning.

   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 ".