- Power source circuit of master cylinder solenoid (skid control ECU)
- One side of CAN branch wire of other systems
- Master cylinder solenoid (skid control ECU)
- Master cylinder solenoid (skid control ECU) branch wire or connector
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Power Source/Network | Section: Networking | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002MXH00CX |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
U0122 |
Lost Communication with Vehicle Dynamics Control Module |
|
DTC |
U0129 |
Lost Communication with Brake System Control Module |
DESCRIPTION
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 [branch wire]/CANL [branch wire] of the ECU and/or sensor is open).
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
U0122 |
There is no communication from the master cylinder solenoid (skid control ECU). |
|
|
U0129 |
There is no communication from the master cylinder solenoid (skid control ECU). |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
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.
NOTICE:
-
w/ Navigation System:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
-
When disconnecting the cable, some systems need to be initialized after the cable is reconnected
.
|
|
2. |
CHECK FOR OPEN IN CAN BUS WIRE (SKID CONTROL ECU BRANCH WIRE) |
|
(a) Disconnect the A24 master cylinder solenoid (skid control ECU) connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A24-11 (CANH) - A24-25 (CANL) |
Engine switch off |
54 to 69 Ω |
|
|
3. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY GROUND) |
(a) Connect the cable to the negative (-) battery terminal.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected
.
|
(b) Disconnect the A24 and A25 master cylinder solenoid (skid control ECU) connectors. |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A24-1 (GND1) - Body ground |
Always |
Below 1 Ω |
|
A24-32 (GND2) - Body ground |
||
|
A25-4 (GND3) - Body ground |
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A24-2 (+BM1) - Body ground |
Always |
11 to 14 V |
|
A24-31 (+BS) - Body ground |
||
|
A25-2 (+BM2) - Body ground |
||
|
A24-46 (IG1) - Body ground |
Engine switch on (IG) |
11 to 14 V |
|
A25-1 (IG2) - Body ground |
|
|
|