CAN Communication Circuit Inspection

1. Turn ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect the harness connector for each unit on the CAN network and check terminals for deformation, disconnection, looseness or damage.

OK or NG 

OK >> GO TO 2.

NG >> Repair terminal or connector as necessary.

With all module and control unit connectors disconnected, check continuity between data link connector terminals.

OK or NG 

OK >> GO TO 3.

NG >>

• Repair harness.
• Replace harness if shielded lines are used for the harness.
  Fig 1: Identifying Harness For Short Circuit

  

Check continuity between data link connector terminals and ground.

Fig 2: Identifying Continuity Between Data Link Connector Terminals And Ground

OK or NG 

OK >> GO TO 4.

NG >>

• Repair harness.
• Replace harness if shielded lines are used for the harness.

1. Remove ECM and IPDM E/R from vehicle.
2. Check resistance between ECM terminals.
   RESISTANCE CHART
   
   

   Terminal		Resistance (Approx.)
   94	86	108 - 132 ohm

3. Check resistance between IPDM E/R terminals.
   RESISTANCE CHART
   
   

   Terminal		Resistance (Approx.)
   39	40	108 - 132 ohm

   Fig 3: Identifying Resistance Between ECM Terminals

   

OK or NG 

OK >> GO TO 5.

NG >> Replace ECM and/or IPDM E/R.

1. Fill in described symptoms on the column "Symptom" in the check sheet.
2. Connect all connectors, and then make sure that the symptom is reproduced.

Check results 

Reproduced >> GO TO 6.

Not reproduced >> Refer to "EXAMPLE OF FILLING IN CHECK SHEET WHEN INITIAL CONDITIONS ARE NOT REPRODUCED ".

Perform the following procedure for each unit on the CAN network, and then perform reproducibility test.

1. Turn ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect the unit connector.
4. Connect the battery cable to the negative terminal.
5. Make sure that the symptom filled in the "Symptom" of the check sheet is reproduced.
   NOTE: Malfunction (related to a unit that the connector is disconnected) is reproduced. Do not confuse the malfunction with the symptom filled in the column of "Symptom" on the check sheet.

Inspection results 

Reproduced >> Connect the disconnected connector. Check other units applying the above procedure.

Not reproduced >> Replace the unit that the connector is disconnected.