CAN COMMUNICATION SYSTEM(for RHD), Diagnostic DTC:U1002
DTC Code | DTC Name |
---|---|
U1002 | Lost Communication with Gateway Module |
DESCRIPTION
The main body ECU (multiplex network body ECU) stores this DTC when no signals can be received from the ECUs that have been memorized as those connected to the sub bus 1.
When the main body ECU (multiplex network body ECU) receives a response signal from the ECUs connected to the sub bus 1, the main body ECU (multiplex network body ECU) recognizes and memorizes that the ECU is connected to the sub bus 1. Based on this memorized data, the main body ECU (multiplex network body ECU) monitors for malfunctions in the ECUs connected to the sub bus 1 when communicating with those ECUs. If the main body ECU (multiplex network body ECU) cannot receive response signals from the ECUs that have been memorized as those connected to the sub bus 1, the main body ECU (multiplex network body ECU) determines that a malfunction exists.
If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (one side of the CANH [CAN branch wire]/CANL [CAN branch wire] of the ECU and/or sensor is open).
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
DTC Output from |
---|---|---|---|---|
U1002 |
Lost Communication with Gateway Module |
Lost communication with the gateway module. |
|
Main body ECU (multiplex network body ECU) |
*1: w/ Parking Assist Monitor System (for Camera built-in ECU)
*2: for Power Seat
For vehicles with a power back door system.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
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.
Before measuring the resistance of the CAN bus, turn the ignition 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 (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.
DTC check procedure: Turn the ignition switch to ON 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.
When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.
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 1
-
*a
Component with harness connected
(No. 6 CAN Junction Connector)
*b
Front view of DLC3
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
Resistance: Malfunction
N31-3 (CANH) - N31-2 (CANL)
Cable disconnected from negative (-) battery terminal
54 to 69 Ω
Below 53 Ω: Short in line
N31-3 (CANH) - N31-2 (CANL)
Cable disconnected from negative (-) battery terminal
54 to 69 Ω
Higher than 70 Ω: Open in CAN main bus line
N31-3 (CANH) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Below 6 kΩ: +B short
N31-2 (CANL) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Below 6 kΩ: +B short
N31-3 (CANH) - N31-1 (E)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Below 200 Ω: Ground short
N31-2 (CANL) - N31-1 (E)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Below 200 Ω: Ground short
Result
Result
Proceed to
OK
A
NG
- Open in CAN main wire
B
NG
- Short in CAN bus wire
C
NG
- +B short
- Ground short
D
B CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 5 CAN JUNCTION CONNECTOR)Click here
C CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)Click here
D CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)Click here
-
CHECK FOR DTC
Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
Check for DTCs.
Body Electrical > Main Body > Trouble Codes
Result
Result
Proceed to
DTC U1002 is output from main body ECU (multiplex network body ECU)
A
Other DTC is output
B
CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 5 CAN JUNCTION CONNECTOR)
-
*a
Rear view of wire harness connector
(to No. 5 CAN Junction Connector)
*b
to No. 1 CAN Junction Terminal
*c
to No. 4 CAN Junction Connector (for Power Seat) or Main Body ECU (Multiplex Network Body ECU) (except Power Seat)
Disconnect the No. 5 CAN junction connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
N32-9 (CANH) - N32-20 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
N32-10 (CANH) - N32-21 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
Result
Result
Proceed to
OK
A
NG (to No. 1 CAN junction terminal CAN main wire)
B
NG (to No. 4 CAN junction connector CAN main wire [for Power Seat])
C
NG (to main body ECU [multiplex network body ECU] CAN main wire [except Power Seat])
D
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 CAN JUNCTION TERMINAL)
-
*a
Rear view of wire harness connector
(to No. 1 CAN Junction Terminal)
Disconnect the No. 1 CAN junction terminal connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
N31-3 (CANH) - N31-2 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
Result
Proceed to
OK
NG
OK REPLACE NO. 1 CAN JUNCTION TERMINAL
NG REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION TERMINAL - NO. 5 CAN JUNCTION CONNECTOR)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 4 CAN JUNCTION CONNECTOR)
-
*a
Front view of wire harness connector
(to No. 4 CAN Junction Connector)
*b
to Main Body ECU (Multiplex Network Body ECU)
*c
to No. 5 CAN Junction Connector
Disconnect the No. 4 CAN junction connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
N30-1 (CANH) - N30-7 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
N30-2 (CANH) - N30-8 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
Result
Result
Proceed to
OK
A
NG (to main body ECU [multiplex network body ECU] CAN main wire)
B
NG (to No. 5 CAN junction connector CAN main wire)
C
A REPLACE NO. 4 CAN JUNCTION CONNECTOR
C REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)
-
CONNECT CONNECTOR
Reconnect the N30 No. 4 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR OPEN IN CAN BUS MAIN WIRE (MAIN BODY ECU - NO. 4 CAN JUNCTION CONNECTOR)
-
*a
Rear view of wire harness connector
(to Main Body ECU [Multiplex Network Body ECU])
Disconnect the main body ECU (multiplex network body ECU) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
G79-9 (CANP) - G79-10 (CANN)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTED TO MAIN BODY ECU (MAIN BODY ECU - NO. 4 CAN JUNCTION CONNECTOR)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR OPEN IN CAN BUS MAIN WIRE (MAIN BODY ECU - NO. 5 CAN JUNCTION CONNECTOR)
-
*a
Rear view of wire harness connector
(to Main Body ECU [Multiplex Network Body ECU])
Disconnect the main body ECU (multiplex network body ECU) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
G79-9 (CANP) - G79-10 (CANN)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTED TO MAIN BODY ECU (MAIN BODY ECU - NO. 5 CAN JUNCTION CONNECTOR)
-
CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)
-
*a
Rear view of wire harness connector
(to No. 5 CAN Junction Connector)
*b
to Television Camera Assembly (w/ Parking Assist Monitor System [for Camera built-in ECU])
*c
to Multiplex Network Door ECU
*d
to No. 1 CAN Junction Terminal
*e
to No. 4 CAN Junction Connector (for Power Seat) or Main Body ECU (Multiplex Network Body ECU) (except Power Seat)
Disconnect the No. 5 CAN junction connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
N32-7 (CANH) - N32-18 (CANL)*
Cable disconnected from negative (-) battery terminal
200 Ω or higher
N32-8 (CANH) - N32-19 (CANL)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
N32-9 (CANH) - N32-20 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
N32-10 (CANH) - N32-21 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
*: w/ Parking Assist Monitor System (for Camera built-in ECU)
Result
Result
Proceed to
OK
A
NG (to television camera assembly CAN branch wire [w/ Parking Assist Monitor System {for Camera built-in ECU}])
B
NG (to multiplex network door ECU CAN branch wire)
C
NG (to No. 1 CAN junction terminal CAN main wire)
D
NG (to No. 4 CAN junction connector CAN main wire [for Power Seat])
E
NG (to main body ECU [multiplex network body ECU] CAN main wire [except Power Seat])
F
A REPLACE NO. 5 CAN JUNCTION CONNECTOR
C CONNECT CONNECTORClick here
D CONNECT CONNECTORClick here
E CONNECT CONNECTORClick here
F CONNECT CONNECTORClick here
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (TELEVISION CAMERA ASSEMBLY)
-
*a
Front view of wire harness connector
(to Television Camera Assembly)
Disconnect the television camera assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
U22-4 (CANH) - U22-1 (CANL)
Cable disconnected from negative (-) battery terminal
54 to 69 Ω
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO TELEVISION CAMERA ASSEMBLY (CANH, CANL)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (MULTIPLEX NETWORK DOOR ECU)
-
*a
Rear view of wire harness connector
(to Multiplex Network Door ECU)
Disconnect the multiplex network door ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
U18-13 (CANP) - U18-14 (CANN)
Cable disconnected from negative (-) battery terminal
54 to 69 Ω
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MULTIPLEX NETWORK DOOR ECU (CANP, CANN)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 CAN JUNCTION TERMINAL)
-
*a
Rear view of wire harness connector
(to No. 1 CAN Junction Terminal)
Disconnect the No. 1 CAN junction terminal connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
N31-3 (CANH) - N31-2 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
Result
Proceed to
OK
NG
OK REPLACE NO. 1 CAN JUNCTION TERMINAL
NG REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION TERMINAL - NO. 5 CAN JUNCTION CONNECTOR)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)
-
*a
Front view of wire harness connector
(to No. 4 CAN Junction Connector)
*b
to Main Body ECU (Multiplex Network Body ECU)
*c
to No. 5 CAN Junction Connector
Disconnect the No. 4 CAN junction connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
N30-1 (CANH) - N30-7 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
N30-2 (CANH) - N30-8 (CANL)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
Result
Result
Proceed to
OK
A
NG (to main body ECU [multiplex network body ECU] CAN main wire)
B
NG (to No. 5 CAN junction connector CAN main wire)
C
A REPLACE NO. 4 CAN JUNCTION CONNECTOR
C REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)
-
CONNECT CONNECTOR
Reconnect the N30 No. 4 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)
-
*a
Rear view of wire harness connector
(to Main Body ECU [Multiplex Network Body ECU])
Disconnect the main body ECU (multiplex network body ECU) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
G79-9 (CANP) - G79-10 (CANN)
Cable disconnected from negative (-) battery terminal
108 to 132 Ω
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTED TO MAIN BODY ECU (CANP, CANN)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
NEXT CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)Click here
CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)
Disconnect the No. 5 CAN junction connector.
*a
Rear view of wire harness connector
(to No. 5 CAN Junction Connector)
*b
Front view of DLC3
*c
to Television Camera Assembly (w/ Parking Assist Monitor System [for Camera built-in ECU])
*d
to Multiplex Network Door ECU
*e
to No. 1 CAN Junction Terminal
*f
to No. 4 CAN Junction Connector (for Power Seat)
to Main Body ECU (Multiplex Network Body ECU) (except Power Seat)
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
Purpose
Connected to
N32-7 (CANH) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANH ground short
Television camera assembly*1
N32-18 (CANL) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANL ground short
N32-7 (CANH) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANH +B short
N32-18 (CANL) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANL +B short
N32-8 (CANH) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANH ground short
Multiplex network door ECU
N32-19 (CANL) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANL ground short
N32-8 (CANH) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANH +B short
N32-19 (CANL) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANL +B short
N32-9 (CANH) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANH ground short
No. 1 CAN junction terminal
N32-20 (CANL) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANL ground short
N32-9 (CANH) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANH +B short
N32-20 (CANL) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANL +B short
N32-10 (CANH) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANH ground short
No. 4 CAN junction connector*2
Main body ECU (multiplex network body ECU)*3
N32-21 (CANL) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANL ground short
N32-10 (CANH) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANH +B short
N32-21 (CANL) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANL +B short
*1: w/ Parking Assist Monitor System (for Camera built-in ECU)
*2: for Power Seat
*3: except Power Seat
Result
Result
Proceed to
OK
A
NG (to television camera assembly CAN branch wire [w/ Parking Assist Monitor System {for Camera built-in ECU}])
B
NG (to multiplex network door ECU CAN branch wire)
C
NG (to No. 1 CAN junction terminal CAN main wire)
D
NG (to No. 4 CAN junction connector CAN main wire [for Power Seat])
E
NG (to main body ECU [multiplex network body ECU] CAN main wire [except Power Seat])
F
A REPLACE NO. 5 CAN JUNCTION CONNECTOR
C CONNECT CONNECTORClick here
D CONNECT CONNECTORClick here
E CONNECT CONNECTORClick here
F CONNECT CONNECTORClick here
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (TELEVISION CAMERA ASSEMBLY)
-
*a
Front view of wire harness connector
(to Television Camera Assembly)
*b
Front view of DLC3
Disconnect the television camera assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
U22-4 (CANH) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
U22-1 (CANL) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
U22-4 (CANH) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
U22-1 (CANL) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO TELEVISION CAMERA ASSEMBLY (CANH, CANL)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (MULTIPLEX NETWORK DOOR ECU)
-
*a
Rear view of wire harness connector
(to Multiplex Network Door ECU)
*b
Front view of DLC3
Disconnect the multiplex network door ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
U18-13 (CANP) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
U18-14 (CANN) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
U18-13 (CANP) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
U18-14 (CANN) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MULTIPLEX NETWORK DOOR ECU (CANP, CANN)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 CAN JUNCTION TERMINAL)
-
*a
Rear view of wire harness connector
(to No. 1 CAN Junction Terminal)
*b
Front view of DLC3
Disconnect the No. 1 CAN junction terminal connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
N31-3 (CANH) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
N31-2 (CANL) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
N31-3 (CANH) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
N31-2 (CANL) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Result
Proceed to
OK
NG
OK REPLACE NO. 1 CAN JUNCTION TERMINAL
NG REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION TERMINAL - NO. 5 CAN JUNCTION CONNECTOR)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)
Disconnect the No. 4 CAN junction connector.
*a
Front view of wire harness connector
(to No. 4 CAN Junction Connector)
*b
Front view of DLC3
*c
to Main Body ECU (Multiplex Network Body ECU)
*d
to No. 5 CAN Junction Connector
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
Purpose
Connected to
N30-1 (CANH) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANH ground short
Main body ECU (multiplex network body ECU)
N30-7 (CANL) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANL ground short
N30-1 (CANH) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANH +B short
N30-7 (CANL) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANL +B short
N30-2 (CANH) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANH ground short
No. 5 CAN junction connector
N30-8 (CANL) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
Inspection for CANL ground short
N30-2 (CANH) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANH +B short
N30-8 (CANL) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Inspection for CANL +B short
Result
Result
Proceed to
OK
A
NG (to main body ECU [multiplex network body ECU] CAN main wire)
B
NG (to No. 5 CAN junction connector CAN main wire)
C
A REPLACE NO. 4 CAN JUNCTION CONNECTOR
C REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)
CONNECT CONNECTOR
Reconnect the N30 No. 4 CAN junction connector.
Result
Result
NEXT
CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)
-
*a
Rear view of wire harness connector
(to Main Body ECU [Multiplex Network Body ECU])
*b
Front view of DLC3
Disconnect the main body ECU (multiplex network body ECU) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
G79-9 (CANP) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
G79-10 (CANN) - G14-4 (CG)
Cable disconnected from negative (-) battery terminal
200 Ω or higher
G79-9 (CANP) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
G79-10 (CANN) - G14-16 (BAT)
Cable disconnected from negative (-) battery terminal
6 kΩ or higher
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (CANP, CANN)
-
CONNECT CONNECTOR
Reconnect the N32 No. 5 CAN junction connector.
Result
Proceed to
NEXT
NEXT CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)Click here