CAN Communication System
NETWORKING: CAN COMMUNICATION SYSTEM: TERMINALS OF ECU; 2013 MY FR-S [03/2012 -]
NOTICE:
* After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Service Precautions.
* Turn the ignition switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.
* Turn the ignition switch off before inspecting CAN bus lines for a ground short.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
* This information describes the standard values for all CAN related components.
HINT
* Operating the ignition switch, any other switches or a door triggers the related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
* Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
1. CAN NO. 1 JUNCTION CONNECTOR
(a) Check the CAN No. 1 junction connector.
HINT
The following tables contain information about the items and buses connected via junction connectors. The junction connector may be used for multiple separate buses. In this case, the name of the bus will be shown below the name of the item that terminals are connected to. The bus name will be shown in brackets (example: (for V bus)).
(1) Connection diagram
(2) Check the connection diagram of the components which are connected to the CAN No. 1 junction connector.
* : for Automatic Transmission System
2. CAN NO. 2 JUNCTION CONNECTOR
(a) Check the CAN No. 2 junction connector.
(1) Connection diagram
(2) Check the connection diagram of the components which are connected to the CAN No. 2 junction connector.
3. DLC3
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
4. ECM
(a) Disconnect the A33 and A36 ECM connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
5. TCM (for Automatic Transmission System)
(a) Disconnect the A18 TCM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
6. POWER STEERING ECU ASSEMBLY
(a) Disconnect the A14 and A15 power steering ECU assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
7. COMBINATION METER ASSEMBLY
(a) Disconnect the D7 combination meter assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
8. INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (NETWORK GATEWAY ECU)
(a) Disconnect the D5 main body ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
9. STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY)
(a) Disconnect the D56 steering angle sensor (spiral cable sub-assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
10. PSP (OPTION CONNECTOR)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
11. AIR BAG ECU ASSEMBLY
(a) Disconnect the D27 air bag ECU assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
12. SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)
(a) Disconnect the A5 skid control ECU (brake actuator assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
