DTC Code | DTC Name |
---|---|
U0100 | Lost Communication with ECM / PCM "A" |
U0129 | Lost Communication with Brake System Control Module |
U0293 | Lost Communication with HV ECU |
DESCRIPTION
The hybrid vehicle control ECU assembly communicates with the ECM and brake booster with master cylinder assembly (skid control ECU). When the hybrid vehicle control ECU assembly does not receive data from the ECM or brake booster with master cylinder assembly (skid control ECU), the hybrid vehicle control ECU assembly stores DTC U0100 or U0129.
The ECM communicates with the hybrid vehicle control ECU assembly. When the ECM does not receive data from the hybrid vehicle control ECU assembly, the ECM stores DTC U0293.
The brake booster with master cylinder assembly (skid control ECU) communicates with the hybrid vehicle control ECU assembly. When the brake booster with master cylinder assembly (skid control ECU) does not receive data from the hybrid vehicle control ECU assembly, the brake booster with master cylinder assembly (skid control ECU) stores DTC U0293.
DTC No. | DTC Detection Condition | Trouble Area |
---|---|---|
U0100 | The hybrid vehicle control ECU assembly does not receive data from the ECM. |
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U0129 | The hybrid vehicle control ECU assembly does not receive data from the brake booster with master cylinder assembly (skid control ECU). |
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U0293 |
|
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Tech Tips
This diagnosis procedure is for when DTC U0100, U0129 and U0293 are output at the same time.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
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 or any 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 Click here.
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 Click here.
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.
Tech Tips
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
RECONFIRM DTC OUTPUT
Reconfirm DTCs.
Tech Tips
If the hybrid vehicle control ECU assembly outputs only DTC U0129, troubleshoot DTC U0129 and check the branch circuit of sub bus 15.
Result | ||||||
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|
B |
GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here |
A |
CHECK SUB BUS 15
Disconnect the cable from the negative (-) auxiliary battery terminal.
*a | Component with harness connected (Hybrid Vehicle Control ECU Assembly) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||||||||||||||||
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Tech Tips
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 hybrid vehicle control ECU assembly.
Result | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
|
A |
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here |
C |
CHECK FOR SHORT IN SUB BUS 15 LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY) Click here |
D |
CHECK FOR SHORT IN SUB BUS 15 LINES (CAN NO. 1 J/C) Click here |
B |
CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY)
*a | Rear view of wire harness connector (to Hybrid Vehicle Control ECU Assembly) |
Disconnect the H212 hybrid vehicle control ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here |
NG |
CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (CAN NO. 1 J/C)
Reconnect the H212 hybrid vehicle control ECU assembly connector.
*a | Front view of wire harness connector (to CAN No. 1 Junction Connector) |
*b | to ECM |
*c | to Hybrid Vehicle Control ECU Assembly |
Disconnect the A62 CAN No. 1 junction connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
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Result | ||||||||
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|
A |
REPLACE CAN NO. 1 JUNCTION CONNECTOR |
B |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - CAN NO. 1 J/C) |
C |
CHECK FOR OPEN IN SUB BUS 15 MAIN LINES (ECM - CAN NO. 1 J/C)
Reconnect the A62 CAN No. 1 junction connector.
*a | Front view of wire harness connector (to ECM) |
Disconnect the A22 ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE ECM Click here |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN NO. 1 J/C) |
CHECK FOR SHORT IN SUB BUS 15 LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY)
*a | Rear view of wire harness connector (to Hybrid Vehicle Control ECU Assembly) |
Disconnect the H212 hybrid vehicle control ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here |
NG |
CHECK FOR SHORT IN SUB BUS 15 LINES (CAN NO. 1 J/C)
Reconnect the H212 hybrid vehicle control ECU assembly connector.
*a | Front view of wire harness connector (to CAN No. 1 Junction Connector) |
*b | to Brake Booster with Master Cylinder Assembly (Skid Control ECU) |
*c | to ECM |
*d | to Hybrid Vehicle Control ECU Assembly |
Disconnect the A62 CAN No. 1 junction connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||
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|
Result | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
|
A |
REPLACE CAN NO. 1 JUNCTION CONNECTOR |
B |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - CAN NO. 1 J/C) |
D |
CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C) Click here |
C |
CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN NO. 1 J/C)
Reconnect the A62 CAN No. 1 junction connector.
*a | Front view of wire harness connector (to ECM) |
Disconnect the A22 ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE ECM Click here |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN NO. 1 J/C) |
CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)
Reconnect the A62 CAN No. 1 junction connector.
*a | Front view of wire harness connector (to Brake Booster with Master Cylinder Assembly (Skid Control ECU)) |
Disconnect the A24 brake booster with master cylinder assembly (skid control ECU) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
A |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
B |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
C |
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) |
CHECK FOR SHORT IN SUB BUS 15 LINES (CAN NO. 1 J/C)
Disconnect the A62 CAN No. 1 junction connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
*1 | DLC3 | - | - |
*a | Front view of wire harness connector (to CAN No. 1 Junction Connector) |
*b | to Brake Booster with Master Cylinder Assembly (Skid Control ECU) |
*c | to ECM | *d | to Hybrid Vehicle Control ECU Assembly |
Tech Tips
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.
Result | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
|
A |
REPLACE CAN NO. 1 JUNCTION CONNECTOR |
C |
CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN NO. 1 J/C) Click here |
D |
CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C) Click here |
B |
CHECK FOR SHORT IN SUB BUS 15 LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY - CAN NO. 1 J/C)
*a | Rear view of wire harness connector (to Hybrid Vehicle Control ECU Assembly) |
Disconnect the H212 hybrid vehicle control ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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.
OK |
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - CAN NO. 1 J/C) |
CHECK FOR SHORT IN SUB BUS 15 LINES (ECM - CAN NO. 1 J/C)
*a | Front view of wire harness connector (to ECM) |
Disconnect the A22 ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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.
OK |
REPLACE ECM Click here |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - CAN NO. 1 J/C) |
CHECK FOR SHORT IN SUB BUS 15 LINES (BRAKE BOOSTER WITH MASTER CYLINDER - CAN NO. 1 J/C)
*a | Front view of wire harness connector (to Brake Booster with Master Cylinder Assembly (Skid Control ECU)) |
Disconnect the A24 brake booster with master cylinder assembly (skid control ECU) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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.
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
A |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
B |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here |
C |
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) |