CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U1002
| DTC Code | DTC Name |
|---|---|
| U1002 | Lost Communication with Gateway Module |
DESCRIPTION
-
The network gateway ECU will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to sub bus 19.
-
When the network gateway ECU receives a response signal from the ECUs connected to sub bus 19, the network gateway ECU recognizes and memorizes that the ECU is connected to sub bus 19. Based on this memorized data, the network gateway ECU monitors for malfunctions in the ECUs connected to sub bus 19 when communicating with those ECUs. If the network gateway ECU cannot receive response signals from the ECUs that have been memorized as those connected to sub bus 19, the network gateway ECU determines that a malfunction exists.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| U1002 | Network gateway ECU cannot receive signals from all ECUs that have been memorized as those connected to sub bus 19. |
|
-
*1: w/ Adaptive Variable Suspension System
-
*2: w/ Dynamic Radar Cruise Control System
-
For vehicles with a dynamic rear steering system.
WIRING DIAGRAM
INSPECTION PROCEDURE
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, 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.
-
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 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 notice before proceeding with work Click here.
-
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 20 seconds.
-
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
-
CHECK SUB BUS 19
-
Text in Illustration *a Component with harness connected
(No. 9 Junction Connector)
*b Front view of DLC3 Disconnect the cable from the negative (-) auxiliary battery terminal.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition Resistance: Malfunction U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Below 53 Ω: Short in line U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line U56-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: +B short U56-2 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: +B short U56-3 (CANH) - U56-1 (E) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: Ground short U56-2 (CANL) - U56-1 (E) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: Ground short Result Result Proceed to OK A NG (Open circuit in CAN main bus line) B NG (Short circuit between bus lines) C NG
-
Ground short
-
+B short
D -
B 
CHECK FOR OPEN IN CAN BUS LINES (SKID CONTROL ECU ASSEMBLY) Click here
C
CHECK FOR SHORT IN CAN BUS LINES (SKID CONTROL ECU ASSEMBLY) Click here
D
CHECK FOR SHORT IN CAN BUS LINE (NO. 5 JUNCTION CONNECTOR) Click here
A 
-
-
CHECK FOR DTC OUTPUT
-
Clear the DTCs.
-
Turn the power switch off.
-
Turn the power switch on (IG) check for DTCs.
Result Result Proceed to U1002 is output from network gateway ECU (GTS display / Multi Bus Monitor 2) A Other DTC is output B
B 
GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here
A 
REPLACE NETWORK GATEWAY ECU Click here
-
-
CHECK FOR OPEN IN CAN BUS LINES (SKID CONTROL ECU ASSEMBLY)
-
Text in Illustration *a Front view of wire harness connector
(to Skid Control ECU Assembly)
Disconnect the skid control ECU assembly connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition A14-7 (CA2H) - A14-6 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
NG
CHECK FOR OPEN IN CAN BUS LINES (NO. 5 JUNCTION CONNECTOR) Click here
OK
REPLACE SKID CONTROL ECU ASSEMBLY Click here
-
-
CHECK FOR OPEN IN CAN BUS LINES (NO. 5 JUNCTION CONNECTOR)
-
Text in Illustration *a Rear view of wire harness connector
(to No. 5 Junction Connector)
*b to Skid Control ECU Assembly *c to No. 2 Junction Connector Reconnect the skid control ECU assembly connector.
-
Disconnect the wire harness connector from the No. 5 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition N133-1 (CANH) - N133-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω N133-5 (CANH) - N133-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Result Result Proceed to OK A NG (to Skid control ECU assembly main bus line) B NG (to No. 2 junction connector main bus line) C
B
REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - SKID CONTROL ECU ASSEMBLY)
C
CHECK FOR OPEN IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR) Click here
A
REPLACE NO. 5 JUNCTION CONNECTOR
-
-
CHECK FOR OPEN IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR)
-
Text in Illustration *a Rear view of wire harness connector
(to No. 2 Junction Connector)
*b to No. 3 Junction Connector *c to No. 5 Junction Connector Reconnect the wire harness connector from the No. 5 junction connector.
-
Disconnect the wire harness connector from the No. 2 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition N165-8 (CANH) - N165-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω N165-11 (CANH) - N165-22 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Result Result Proceed to OK A NG (to No. 5 junction connector main bus line) B NG (to No. 3 junction connector main bus line) C
B
REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)
C
CHECK FOR OPEN IN CAN BUS LINES (NO. 3 JUNCTION CONNECTOR) Click here
A
REPLACE NO. 2 JUNCTION CONNECTOR
-
-
CHECK FOR OPEN IN CAN BUS LINES (NO. 3 JUNCTION CONNECTOR)
-
Text in Illustration *a Rear view of wire harness connector
(to No. 3 Junction Connector)
*b to No. 9 Junction Connector *c to No. 2 Junction Connector Reconnect the wire harness connector from the No. 2 junction connector.
-
Disconnect the wire harness connector from the No. 3 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition U54-5 (CANH) - U54-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω U54-6 (CANH) - U54-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Result Result Proceed to OK A NG (to No. 2 junction connector main bus line) B NG (to No. 9 junction connector main bus line) C
B
REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)
C
CHECK FOR OPEN IN CAN BUS LINES (NO. 9 JUNCTION CONNECTOR) Click here
A
REPLACE NO. 3 JUNCTION CONNECTOR
-
-
CHECK FOR OPEN IN CAN BUS LINES (NO. 9 JUNCTION CONNECTOR)
-
Text in Illustration *a Rear view of wire harness connector
(to No. 9 Junction Connector)
Reconnect the wire harness connector from the No. 3 junction connector.
-
Disconnect the wire harness connector from the No. 9 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
NG
REPAIR CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 9 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)
OK
REPLACE NO. 9 JUNCTION CONNECTOR
-
-
CHECK FOR SHORT IN CAN BUS LINES (SKID CONTROL ECU ASSEMBLY)
-
Text in Illustration *a Front view of wire harness connector
(to Skid Control ECU Assembly)
Disconnect the skid control ECU assembly connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition A14-7 (CA2H) - A14-6 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
NG
CHECK FOR SHORT IN CAN BUS LINES (NO. 5 JUNCTION CONNECTOR) Click here
OK
REPLACE SKID CONTROL ECU ASSEMBLY Click here
-
-
CHECK FOR SHORT IN CAN BUS LINES (NO. 5 JUNCTION CONNECTOR)
-
Text in Illustration *a Rear view of wire harness connector
(to No. 5 Junction Connector)
*b to Skid Control ECU Assembly *c to Front Steering Control ECU *d to Absorber Control ECU *e to Network Gateway ECU *f to No. 2 Junction Connector *g to Power Steering ECU Assembly Reconnect the skid control ECU assembly connector.
-
Disconnect the wire harness connector from the No. 2 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition N133-1 (CANH) - N133-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω N133-2 (CANH) - N133-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher N133-3 (CANH) - N133-14 (CANL)* Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher N133-4 (CANH) - N133-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher N133-5 (CANH) - N133-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω N133-6 (CANH) - N133-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
-
*: w/ Adaptive Variable Suspension System
Result Result Proceed to OK A NG (to Skid control ECU assembly main bus line) B NG (to No. 2 junction connector main bus line) C NG (to Front steering control ECU branch bus line) D NG (to Absorber control ECU branch bus line [w/ Adaptive Variable Suspension System]) NG (to Network gateway ECU branch bus line) NG (to Power steering ECU assembly branch bus line) -
B
REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - SKID CONTROL ECU ASSEMBLY)
C
CHECK FOR SHORT IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR) Click here
D
CHECK FOR SHORT IN CAN BUS LINES (ECUS) Click here
A
REPLACE NO. 5 JUNCTION CONNECTOR
-
-
CHECK FOR SHORT IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR)
-
Text in Illustration *a Rear view of wire harness connector
(to No. 2 Junction Connector)
*b to Driving Support ECU Assembly *c to No. 3 Junction Connector *d to No. 5 Junction Connector Reconnect the wire harness connector from the No. 5 junction connector.
-
Disconnect the wire harness connector from the No. 2 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition N165-7 (CANH) - N165-18 (CANL)* Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher N165-8 (CANH) - N165-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω N165-11 (CANH) - N165-22 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
-
*: w/ Dynamic Radar Cruise Control System
Result Result Proceed to OK A NG (to No. 5 junction connector main bus line) B NG (to No. 3 junction connector main bus line) C NG (to Driving support ECU assembly branch bus line [w/ Dynamic Radar Cruise Control System]) D -
B
REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)
C
CHECK FOR SHORT IN CAN BUS LINES (NO. 3 JUNCTION CONNECTOR) Click here
D
CHECK FOR SHORT IN CAN BUS LINES (ECUS) Click here
A
REPLACE NO. 2 JUNCTION CONNECTOR
-
-
CHECK FOR SHORT IN CAN BUS LINES (NO. 3 JUNCTION CONNECTOR)
-
Text in Illustration *a Rear view of wire harness connector
(to No. 3 Junction Connector)
*b to No. 9 Junction Connector *c to No. 2 Junction Connector *d to Rear Steering Control ECU Reconnect the wire harness connector from the No. 2 junction connector.
-
Disconnect the wire harness connector from the No. 3 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition U54-5 (CANH) - U54-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω U54-6 (CANH) - U54-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω U54-7 (CANH) - U54-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Result Result Proceed to OK A NG (to No. 2 junction connector main bus line) B NG (to No. 9 junction connector main bus line) C NG (to Rear steering control ECU branch bus line) D
B
REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)
C
CHECK FOR SHORT IN CAN BUS LINES (NO. 9 JUNCTION CONNECTOR) Click here
D
CHECK FOR SHORT IN CAN BUS LINES (ECUS) Click here
A
REPLACE NO. 3 JUNCTION CONNECTOR
-
-
CHECK FOR SHORT IN CAN BUS LINES (NO. 9 JUNCTION CONNECTOR)
-
Text in Illustration *a Rear view of wire harness connector
(to No. 9 Junction Connector)
Reconnect the wire harness connector from the No. 3 junction connector.
-
Disconnect the wire harness connector from the No. 9 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
NG
REPAIR CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 9 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)
OK
REPLACE NO. 9 JUNCTION CONNECTOR
-
-
CHECK FOR SHORT IN CAN BUS LINES (ECUS)
-
Text in Illustration *a Component with harness connected
(No. 9 Junction Connector)
Reconnect all wire harness connectors (No. 2 junction connector, No. 3 junction connector and No. 5 junction connector).
-
Disconnect the connector that includes terminals CANH and CANL from the ECU (or sensor) to which the short-circuited branch line is connected Click here.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Tech Tips
-
If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU (or sensor), there may be a short in the ECU (or sensor).
-
If the resistance does not become normal (between 54 and 69 Ω) when the connector is disconnected from the ECU (or sensor), repair or replace the short-circuited branch line or connector.
-
NG
REPAIR OR REPLACE CORRESPONDING ECU WIRE
OK
REPLACE CORRESPONDING ECU
-
-
CHECK FOR SHORT IN CAN BUS LINE (NO. 5 JUNCTION CONNECTOR)
-
Disconnect the wire harness connector from the No. 5 junction connector.
Text in Illustration *a Rear view of wire harness connector
(to No. 5 Junction Connector)
*b Front view of DLC3 *c to Skid Control ECU Assembly *d to Front Steering Control ECU *e to Absorber Control ECU *f to Network Gateway ECU *g to No. 2 Junction Connector *h to Power Steering ECU Assembly -
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition Purpose Connected to N133-1 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Skid control ECU assembly N133-12 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short N133-2 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Front steering control ECU N133-13 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short N133-3 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Absorber control ECU* N133-14 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short N133-4 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Network gateway ECU N133-15 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short N133-5 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short No. 2 junction connector N133-16 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short N133-6 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Power steering ECU assembly N133-17 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short N133-1 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Skid control ECU assembly N133-12 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short N133-2 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Front steering control ECU N133-13 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short N133-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Absorber control ECU* N133-14 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short N133-4 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Network gateway ECU N133-15 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short N133-5 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short No. 2 junction connector N133-16 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short N133-6 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Power steering ECU assembly N133-17 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
-
*: w/ Adaptive Variable Suspension System
Result Result Proceed to OK A NG (to Skid control ECU assembly main bus line) B NG (to No. 2 junction connector main bus line) C NG (to Front steering control ECU branch bus line) D NG (to Absorber control ECU branch bus line [w/ Adaptive Variable Suspension System]) NG (to Network gateway ECU branch bus line) NG (to Power steering ECU assembly branch bus line) 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 19 inspection.
-
B
CHECK FOR SHORT IN CAN BUS LINE (SKID CONTROL ECU ASSEMBLY) Click here
C
CHECK FOR SHORT IN CAN BUS LINE (NO. 2 JUNCTION CONNECTOR) Click here
D
CHECK FOR SHORT IN CAN BUS LINE (ECUS) Click here
A
REPLACE NO. 5 JUNCTION CONNECTOR
-
-
CHECK FOR SHORT IN CAN BUS LINE (SKID CONTROL ECU ASSEMBLY)
-
Text in Illustration *a Front view of wire harness connector
(to Skid Control ECU Assembly)
*b Front view of DLC3 Reconnect the wire harness connector from the No. 5 junction connector.
-
Disconnect the skid control ECU assembly connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition A14-7 (CA2H) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher A14-6 (CA2L) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher A14-7 (CA2H) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher A14-6 (CA2L) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher 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 19 inspection.
NG
REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 5 JUNCTION CONNECTOR)
OK
REPLACE SKID CONTROL ECU ASSEMBLY Click here
-
-
CHECK FOR SHORT IN CAN BUS LINE (NO. 2 JUNCTION CONNECTOR)
-
Reconnect the wire harness connector from the No. 2 junction connector.
Text in Illustration *a Rear view of wire harness connector
(to No. 2 Junction Connector)
*b Front view of DLC3 *c to Driving Support ECU Assembly *d to No. 3 Junction Connector *e to No. 5 Junction Connector - - -
Disconnect the wire harness connector from the No. 2 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition Purpose Connected to N165-7 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Driving support ECU assembly* N165-18 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short N165-8 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short No. 3 junction connector N165-19 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short N165-11 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short No. 5 junction connector N165-22 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short N165-7 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Driving support ECU assembly* N165-18 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short N165-8 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short No. 3 junction connector N165-19 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short N165-11 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short No. 5 junction connector N165-22 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
-
*: w/ Dynamic Radar Cruise Control System
Result Result Proceed to OK A NG (to No. 5 junction connector main bus line) B NG (to No. 3 junction connector main bus line) C NG (to Driving support ECU assembly branch bus line [w/ Dynamic Radar Cruise Control System]) D 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 19 inspection.
-
B
REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)
C
CHECK FOR SHORT IN CAN BUS LINE (NO. 3 JUNCTION CONNECTOR) Click here
D
CHECK FOR SHORT IN CAN BUS LINE (ECUS) Click here
A
REPLACE NO. 2 JUNCTION CONNECTOR
-
-
CHECK FOR SHORT IN CAN BUS LINE (NO. 3 JUNCTION CONNECTOR)
-
Reconnect the wire harness connector from the No. 2 junction connector.
Text in Illustration *a Rear view of wire harness connector
(to No. 3 Junction Connector)
*b Front view of DLC3 *c to No. 9 Junction Connector *d to No. 2 Junction Connector *e to Rear Steering Control ECU - - -
Disconnect the wire harness connector from the No. 3 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition Purpose Connected to U54-5 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short No. 9 junction connector U54-16 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short U54-6 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short No. 2 junction connector U54-17 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short U54-7 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Rear steering control ECU U54-18 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short U54-5 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short No. 9 junction connector U54-16 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short U54-6 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short No. 2 junction connector U54-17 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short U54-7 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Rear steering control ECU U54-18 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short Result Result Proceed to OK A NG (to No. 2 junction connector main bus line) B NG (to No. 9 junction connector main bus line) C NG (to Rear steering control ECU branch bus line) D 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 19 inspection.
B
REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)
C
CHECK FOR SHORT IN CAN BUS LINE (NO. 9 JUNCTION CONNECTOR) Click here
D
CHECK FOR SHORT IN CAN BUS LINE (ECUS) Click here
A
REPLACE NO. 3 JUNCTION CONNECTOR
-
-
CHECK FOR SHORT IN CAN BUS LINE (NO. 9 JUNCTION CONNECTOR)
-
Text in Illustration *a Rear view of wire harness connector
(to No. 9 Junction Connector)
*b Front view of DLC3 Reconnect the wire harness connector from the No. 3 junction connector.
-
Disconnect the wire harness connector from the No. 9 junction connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition U56-3 (CANH) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher U56-2 (CANL) - N20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher U56-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher U56-2 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher 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 19 inspection.
NG
REPAIR CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 9 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)
OK
REPLACE NO. 9 JUNCTION CONNECTOR
-
-
CHECK FOR SHORT IN CAN BUS LINE (ECUS)
-
Text in Illustration *a Component with harness connected
(No. 9 Junction Connector)
*b Front view of DLC3 Reconnect all wire harness connectors (No. 2 junction connector, No. 3 junction connector and No. 5 junction connector).
-
Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to B+ or shorted to GND is connected.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition U56-3 (CANH) - U56-1 (E) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher U56-2 (CANL) - U56-1 (E) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher U56-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher U56-2 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher 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 19 inspection.
-
If the resistance becomes abnormal when an ECU connector is reconnected, there may be a short in the ECU.
-
NG
REPAIR OR REPLACE CORRESPONDING ECU WIRE
OK
REPLACE CORRESPONDING ECU
-