Diagnostic Procedure 2

Self-diagnostic results: 

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

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: Confirming Self-Diagnostic Results

   

   Is CONSULT-II screen displayed as above? 

   1. Yes: GO TO 2.
   2. No: GO TO SYMPTOM MATRIX CHART 1  .
2. CHECK POWER SUPPLY CIRCUIT FOR IMMU 
   1. Disconnect IMMU connector.
   2. Check voltage between terminal 8 of IMMU and ground with CONSULT-II or tester.
   Fig 2: Checking Power Supply Circuit For IMMU

   

   OK or NG 

   1. OK: GO TO 3.
   2. NG: Check the following 

      7.5A fuse (No. 62, located in the fuse and fusible link box)

      Harness for open or short between fuse and IMMU connector Ref. Part No. C1 

3. CHECK IGN SW. ON SIGNAL 
   1. Turn ignition switch ON.
   2. Check voltage between terminal 7 of IMMU and ground with CONSULT-II or tester.
   Fig 3: Checking IGN SW. ON Signal

   

   OK or NG 

   1. OK: GO TO 4.
   2. NG: Check the following 

      10A fuse [No. 16, located in the fuse block (J/B)]

      Harness for open or short between fuse and IMMU connector Ref. part No. C2 

4. CHECK GROUND CIRCUIT FOR IMMU 
   1. Turn ignition OFF.
   2. Check harness continuity between IMMU terminal 4 and ground.
   Fig 4: Checking Ground Circuit For IMMU

   

   OK or NG 

   1. OK: GO TO 5.
   2. NG: Repair harness. Ref. part No. C3 
5. CHECK COMMUNICATION LINE OPEN CIRCUIT 
   1. Disconnect ECM connector.
   2. Check harness continuity between ECM terminal 116 and IMMU terminal 1.
   Fig 5: Checking Communication Line Open Circuit

   

   OK or NG 

   1. OK: GO TO 6.
   2. NG: Repair harness or connector.

      Ref. part No. C4 

6. CHECK COMMUNICATION LINE BATTERY SHORT CIRCUIT 
   1. Turn ignition ON.
   2. Check voltage between ECM terminal 116 or IMMU terminal 1 and ground.
   Fig 6: Checking Communication Line Battery Short Circuit

   

   OK or NG 

   1. OK: GO TO 7.
   2. NG: Communication line is short-circuited with battery voltage line or ignition switch ON line.

      Repair harness or connectors.

      Ref. part No. C4 

7. CHECK COMMUNICATION LINE GROUND SHORT CIRCUIT 
   1. Turn ignition switch OFF.
   2. Check continuity between ECM terminal 116 or IMMU terminal 1 and ground.
   Fig 7: Checking Communication Line Ground Short Circuit

   

   OK or NG 

   1. OK: GO TO 8.
   2. NG: Communication line is short-circuited with ground line.

      Repair harness or connectors.

      Ref. part No. C4 

8. SIGNAL FROM ECM TO IMMU CHECK 
   1. Check the signal between ECM terminal 116 and ground with CONSULT-II or oscilloscope when ignition switch is turned "ON".
   2. Make sure signals which are shown in the figure below can be detected during 750 msec. just after ignition switch is turned "ON".
   Fig 8: Signal From ECM To IMMU

   

   OK or NG 

   1. OK: IMMU is malfunctioning.

      Replace IMMU. Ref. part No. A 

      Perform initialization with CONSULT-II.

      For the operation of initialization, refer to "CONSULT-II Operation Manual IVIS/NVIS".

   2. NG: ECM is malfunctioning.

      Replace ECM. Ref. part No. B 

      Perform initialization with CONSULT-II.

      For the operation of initialization, refer to "CONSULT-II Operation Manual IVIS/NVIS".