- Short between CAN bus lines
- Combination meter ECU
- Main body ECU
- Skid control ECU
- Steering angle sensor
- Center airbag sensor
- Bus buffer ECU*1
- Air conditioning amplifier
- ECM
- Power steering ECU
- 4WD control ECU*2
- Suspension control ECU*3
- Distance control ECU*4
- No. 1 junction connector
- No. 2 junction connector
- No. 4 junction connector*3
| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Power Source/Network | Section: Networking | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002VT7002X |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Short in CAN Bus Lines |
DESCRIPTION
There may be a short circuit between the CAN bus lines when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.
|
Symptom |
Trouble Area |
|---|---|
|
Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is below 54 Ω. |
|
HINT:
- *1: w/ Bus buffer ECU
- *2: w/ 4WD
- *3: w/ Air suspension system
- *4: w/ Dynamic laser cruise control
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Operating the ignition switch, any other switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
PROCEDURE
|
1. |
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL |
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
|
|
2. |
CHECK FOR SHORT IN CAN BUS WIRES (DLC3 BRANCH WIRE) |
|
(a) Disconnect the H93 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H19-6 (CANH) - H19-14 (CANL) |
Ignition switch off |
1M Ω or higher |
|
|
3. |
CONNECT CONNECTOR |
(a) Reconnect the H93 No. 1 junction connector.
|
|
4. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR SIDE) |
|
|
(a) Disconnect the H100 No. 2 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H19-6 (CANH) - H19-14 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
|
5. |
CONNECT CONNECTOR |
(a) Reconnect the H100 No. 2 junction connector.
|
|
6. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER) |
|
(a) Disconnect the H92 No. 2 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H92-1 (CANH) - H92-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
7. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - BUS BUFFER ECU) |
NOTICE:
For vehicles without bus buffer ECU, go to "CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - 4WD CONTROL ECU)".
|
(a) Disconnect the H105 No. 2 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H105-1 (CANH) - H105-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
8. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - 4WD CONTROL ECU) |
NOTICE:
For vehicles without 4WD, go to "Check for Short in CAN Bus Wires (No. 2 Junction Connector - ECM)".
|
(a) Disconnect the H92 No. 2 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H95-1 (CANH) - H95-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
9. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - ECM) |
|
(a) Disconnect the H99 No. 2 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H99-1 (CANH) - H99-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
11. |
CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER) |
|
|
(a) Disconnect the H24 air conditioning amplifier connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H92-1 (CANH) - H92-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
13. |
CHECK FOR SHORT IN CAN BUS WIRES (BUS BUFFER ECU) |
|
|
(a) Disconnect the H66 bus buffer ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H105-1 (CANH) - H105-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
15. |
CHECK FOR SHORT IN CAN BUS WIRES (4WD CONTROL ECU) |
|
|
(a) Disconnect the A28 4WD control ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H95-1 (CANH) - H95-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
17. |
CHECK FOR SHORT IN CAN BUS WIRES (ECM) |
|
|
(a) Disconnect the A27 ECM connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H99-1 (CANH) - H99-2 (CANL) |
Ignition switch off |
1 Ω or higher |
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK (for 2UZ-FE) |
B |
|
OK (for 3UR-FE) |
C |
|
|
19. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) |
|
(a) Disconnect the H101 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H101-1 (CANH) - H101-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
20. |
CONNECT CONNECTOR |
(a) Reconnect the H101 No. 1 junction connector.
(b) Reconnect the H100 No. 2 junction connector.
|
|
21. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR SIDE) |
NOTICE:
For vehicles without air suspension system, go to "Check for Short in CAN Bus Wires (No. 1 Junction Connector - Combination Meter ECU)".
|
|
(a) Disconnect the O41 No. 4 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H19-6 (CANH) - H19-14 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
|
22. |
CONNECT CONNECTOR |
(a) Reconnect the O41 No. 4 junction connector.
|
|
23. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - SUSPENSION CONTROL ECU) |
|
(a) Disconnect the O42 No. 4 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
O42-6 (CANH) - O42-12 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
24. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - COMBINATION METER ECU) |
|
(a) Disconnect the O41 No. 4 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
O41-2 (CANH) - O41-8 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
|
26. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR) |
|
(a) Disconnect the H91 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H91-1 (CANH) - H91-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
27. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - COMBINATION METER ECU) |
NOTICE:
For vehicles without air suspension system, go to "Check for Short in CAN Bus Wires (No. 1 Junction Connector - Power Steering ECU)".
|
|
(a) Disconnect the H91 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H91-1 (CANH) - H91-2 (CANL) |
Ignition switch off |
108 to 132 Ω |
|
|
28. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - POWER STEERING ECU) |
|
(a) Disconnect the H106 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H106-1 (CANH) - H106-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
29. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - DISTANCE CONTROL ECU) |
NOTICE:
For vehicles with air suspension system, go to "CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - MAIN BODY ECU)".
|
(a) Disconnect the A60 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
A60-1 (CANH) - A60-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
30. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - MAIN BODY ECU) |
|
(a) Disconnect the H103 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H103-1 (CANH) - H103-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
31. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU) |
|
(a) Disconnect the A59 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
A59-1 (CANH) - A59-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
32. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - STEERING ANGLE SENSOR) |
|
(a) Disconnect the H94 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H94-1 (CANH) - H94-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
33. |
CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR) |
|
(a) Disconnect the H90 No. 1 junction connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H90-1 (CANH) - H90-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
35. |
CHECK FOR SHORT IN CAN BUS WIRES (SUSPENSION CONTROL ECU) |
|
|
(a) w/ AVS (1) Disconnect the O18 suspension control ECU connector. (2) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
(b) w/o AVS
(1) Disconnect the O19 suspension control ECU connector.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
O42-6 (CANH) - O42-12 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
37. |
CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ECU) |
|
(a) Disconnect the H37 combination meter ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H37-33 (CANH) - H37-34 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
39. |
CHECK FOR SHORT IN CAN BUS WIRES (POWER STEERING ECU) |
|
(a) Disconnect the H38 power steering ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H106-1 (CANH) - H106-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
41. |
CHECK FOR SHORT IN CAN BUS WIRES (DISTANCE CONTROL ECU) |
|
|
(a) Disconnect the A43 distance control ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
A60-1 (CANH) - A60-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
43. |
CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU) |
|
|
(a) Disconnect the H2 main body ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H103-1 (CANH) - H103-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
45. |
CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU) |
|
|
(a) Disconnect the A19 skid control ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
A59-1 (CANH) - A59-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
47. |
CHECK FOR SHORT IN CAN BUS WIRES (STEERING ANGLE SENSOR) |
|
|
(a) Disconnect the H6 steering angle sensor connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H94-1 (CANH) - H94-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
49. |
CHECK FOR SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR) |
|
|
(a) Disconnect the H56 center airbag sensor connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Measured Resistance |
|---|---|---|
|
H90-1 (CANH) - H90-2 (CANL) |
Ignition switch off |
1 Ω or higher |
|
|
|