Diagnosis Procedure
- ERROR ECU CONFIRMATION
Confirm whether there is error in one ECU or plural ECU on CAN diagnosis function with CONSULT.
Is error in one ECU or plural ECU?
One ECU
GO TO 2.
Plural ECU
GO TO 3.
- CHECK ECU CIRCUIT
Check a circuit for applicable ECU. Refer to following.
Unit name
Circuit
Reference
Air bag diagnosis sensor unit
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the air bag diagnosis sensor unit
CAN gateway
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the CAN gateway
ECM
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the ECM
Electric parking brake control module
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the electric parking brake control module
Electronic ignition switch control unit
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the electronic ignition switch control unit
Electronic stability program control unit
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the electronic stability program control unit
ICC sensor
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the ICC sensor
Steering column control module
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the steering column control module
Distance sensor
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the distance sensor
Side radar LH
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the side radar LH
Side radar RH
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the side radar RH
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace applicable parts.
- CHECK CAN CIRCUIT VOLTAGE
- Turn ignition switch ON.
- Check voltage between CAN potential distributor electrical connector (Chassis 1) harness connector each terminals.
Terminals
Voltage
(Approx.)
+
-
CAN potential distributor electrical connector (Chassis 1)
Terminal
Terminal
CAN-H
Ground
2.6 - 2.9 V
CAN-L
Ground
2.1 - 2.4 V
CAN-H
CAN-L
0.3 - 0.6 V
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
GO TO 4.
- CHECK HARNESS CONNECTOR CONDITION
- Turn ignition switch OFF.
- Check each harness connector connected to CAN potential distributor electrical connector for proper connection, locking, loose contact, damage, contamination and corrosion.
Is the inspection result normal?
YES
GO TO 5.
NO
Securely connects or repair the harness connectors.
- CHECK CAN POTENTIAL DISTRIBUTOR ELECTRICAL CONNECTOR
- Turn ignition switch OFF.
- Disconnect all of harness connector from CAN potential distributor electrical connector (Chassis 1).
- Check CAN potential distributor electrical connector (Chassis 1). Refer to Component Inspection [CAN Potential Distributor Electrical Connector (Chassis 1)] .
Is the inspection result normal?
YES
GO TO 6.
NO
Replace CAN potential distributor electrical connector (Chassis 1).
- POSSIBLE CAUSE CONFIRMATION
- Turn ignition switch ON.
- Check the voltage between CAN potential distributor electrical connector (Chassis 1) terminals (CAN-H and CAN-L).NOTE: [Recommend] Check CAN potential distributor electrical connector (Chassis 1) terminals that harness connector is not connected.
- Disconnect each harness connector from CAN potential distributor electrical connector (Chassis 1) one by one.
- Check the voltage change when the harness connector just disconnected.
Terminals
Condition
Voltage
(Approx.)
+
-
CAN potential distributor electrical connector (Chassis 1)
Terminal
Terminal
CAN-H
CAN-L
When the harness connector just disconnected.
No change
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
GO TO 7.
- CHECK SHORT CIRCUIT
Check the possible cause circuit for short to battery or ground.
Unit name
Circuit
Reference
Air bag diagnosis sensor unit
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the air bag diagnosis sensor unit
CAN gateway
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the CAN gateway
ECM
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the ECM
Electric parking brake control module
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the electric parking brake control module
Electronic ignition switch control unit
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the electronic ignition switch control unit
Electronic stability program control unit
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the electronic stability program control unit
ICC sensor
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the ICC sensor
Steering column control module
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the steering column control module
Distance sensor
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the distance sensor
Side radar LH
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the side radar LH
Side radar RH
Circuit between the CAN potential distributor electrical connector (Chassis 1) and the side radar RH
Is the inspection result normal?
YES
Replace applicable ECU.
NO
Repair or replace harness.