CAN Communication System
NETWORKING: CAN COMMUNICATION SYSTEM: U0100, U0129, U0293: Lost Communication with ECM / PCM "A"
U0293 - Lost Communication with HV ECU
DESCRIPTION
* The power management control ECU communicates with the ECM and brake booster with master cylinder assembly (skid control ECU). When the power management control ECU does not receive data from the ECM or brake booster with master cylinder assembly (skid control ECU), the power management control ECU stores DTC U0100 or U0129.
* The ECM communicates with the power management control ECU. When the ECM does not receive data from the power management control ECU, the ECM stores DTC U0293.
* The brake booster with master cylinder assembly (skid control ECU) communicates with the power management control ECU. When the brake booster with master cylinder assembly (skid control ECU) does not receive data from the power management control ECU, the brake booster with master cylinder assembly (skid control ECU) stores DTC U0293.
HINT
This diagnosis procedure is for when DTC U0100, U0129 and U0293 are output at the same time.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
* After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Service Precautions.
* Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output How to Proceed With Troubleshooting.
* After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
* DTC check procedure: Turn the power switch on (IG) and wait at least 60 seconds,
* After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Diagnosis System.
HINT
* Operating the power switch, any other switches or a door triggers 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.
PROCEDURE
1. RECONFIRM DTC OUTPUT
(a) Check if Hybrid Control of the power management control ECU outputs only DTC U0129.
HINT
If the power management control ECU outputs only DTC U0129, troubleshoot DTC U0129 and check the branch circuit of sub bus 15.
Result:
B -- GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC CAN Communication System
A -- Continue to next step.
2. CHECK SUB BUS 15
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT
* When the values are as specified, clear and recheck for DTCs. When no DTCs are output, check for malfunctions such as damage or improper connection of the relevant connectors.
* If DTCs are output although the bus circuit is normal and DTCs were cleared, replace the power management control ECU.
Result:
B -- CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (POWER MANAGEMENT CONTROL ECU)
C -- CHECK FOR SHORT IN SUB BUS 15 LINES (POWER MANAGEMENT CONTROL ECU)
D -- CHECK FOR SHORT IN SUB BUS 15 LINES (CAN NO. 1 J/C)
A -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
3. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (POWER MANAGEMENT CONTROL ECU)
(a) Disconnect the power management control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (CAN NO. 1 J/C)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
4. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (CAN NO. 1 J/C)
(a) Reconnect the power management control ECU connector.
(b) Disconnect the CAN No. 1 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
B -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN NO. 1 J/C)
C -- CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (ECM - CAN NO. 1 J/C)
A -- REPLACE CAN NO. 1 JUNCTION CONNECTOR
5. CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (ECM - CAN NO. 1 J/C)
(a) Reconnect the CAN No. 1 junction connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN NO. 1 J/C)
OK -- REPLACE ECM Removal
6. CHECK FOR SHORT IN SUB BUS 15 LINES (POWER MANAGEMENT CONTROL ECU)
(a) Disconnect the power management control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN SUB BUS 15 LINES (CAN NO. 1 J/C)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
7. CHECK FOR SHORT IN SUB BUS 15 LINES (CAN NO. 1 J/C)
(a) Reconnect the power management control ECU connector.
(b) Disconnect the CAN No. 1 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
B -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN NO. 1 J/C)
C -- CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN NO. 1 J/C)
D -- CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)
A -- REPLACE CAN NO. 1 JUNCTION CONNECTOR
8. CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN NO. 1 J/C)
(a) Reconnect the CAN No. 1 junction connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN NO. 1 J/C)
OK -- REPLACE ECM Removal
9. CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)
(a) Reconnect the CAN No. 1 junction connector.
(b) Disconnect the brake booster with master cylinder assembly (skid control ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)
OK -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Removal
10. CHECK FOR SHORT IN SUB BUS 15 LINES (CAN NO. 1 J/C)
(a) Disconnect the CAN No. 1 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT
* It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
* Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.
Text in Illustration
Result:
B -- CHECK FOR SHORT IN SUB BUS 15 LINES (POWER MANAGEMENT CONTROL ECU - CAN NO. 1 J/C)
C -- CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN NO. 1 J/C)
D -- CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)
A -- REPLACE CAN NO. 1 JUNCTION CONNECTOR
11. CHECK FOR SHORT IN SUB BUS 15 LINES (POWER MANAGEMENT CONTROL ECU - CAN NO. 1 J/C)
(a) Disconnect the power management control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT
* It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
* Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN NO. 1 J/C)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
12. CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN NO. 1 J/C)
(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT
* It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
* Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN NO. 1 J/C)
OK -- REPLACE ECM Removal
13. CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)
(a) Disconnect the brake booster with master cylinder assembly (skid control ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT
* It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 15 inspection.
* Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 15 inspection.
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)
OK -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Removal