Skid Control ECU Communication Stop Mode
DESCRIPTION
|
Detection Item | Symptom |
Trouble Area |
| Skid Control ECU Communication Stop Mode |
Any of the following conditions are met:
- Communication stop for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here 
- Communication stop history for "Skid Control (ABS/VSC/TRAC)" is
indicated on the "Communication Bus Check (Detail)" screen of the
Techstream. (The Lost Communication Time value for "Skid Control
(ABS/VSC/TRAC)" is 6 or more.)
Click here
- Communication system DTCs (DTCs that start with U) that correspond to
"Skid Control ECU Communication Stop Mode" in "DTC Combination Table"
are output.
Click here
|
- Brake actuator assembly branch line or connector
- Power source circuit of brake actuator assembly
- Brake actuator assembly ground circuit
- Brake actuator assembly
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
HINT:
- Before disconnecting related connectors for inspection, push in on each
connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
|
1. | CHECK FOR OPEN IN CAN BUS LINES (BRAKE ACTUATOR ASSEMBLY BRANCH LINE) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A28 brake actuator assembly connector.
| (c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A28-5 (CANH) - A28-19 (CANL) |
Cable disconnected from negative (-) battery terminal |
54 to 69 Ω | |
 |
|
*a | Front view of wire harness connector
(to Brake Actuator Assembly) | | |
| NG |
 | REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (BRAKE ACTUATOR ASSEMBLY) |
|
OK |
 | |
| 2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
| (a) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A28-46 (GND1) - Body ground |
Cable disconnected from negative (-) battery terminal |
Below 1 Ω | |
 |
|
*a | Front view of wire harness connector
(to Brake Actuator Assembly) | | |
(b) Reconnect the cable to the negative (-) battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|
A28-36 (IG1) - Body ground |
Engine switch on (IG) |
11 to 14 V |
|
A28-1 (+BM) - Body ground |
Always | 11 to 14 V |
|
A28-30 (+BS) - Body ground |
Always | 11 to 14 V |
| OK |
| REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
Suspension Control ECU Communication Stop Mode
DESCRIPTION
|
Detection Item | Symptom |
Trouble Area |
| Suspension Control ECU Communication Stop Mode |
Any of the following conditions are met:
- Communication stop for "Suspension Control (Air Suspension)" is
indicated on the "Communication Bus Check" screen of the Techstream.
Click here 
- Communication stop history for "Suspension Control (Air Suspension)" is
indicated on the "Communication Bus Check (Detail)" screen of the
Techstream. (The Lost Communication Time value for "Suspension Control
(Air Suspension)" is 6 or more.)
Click here
- Communication system DTCs (DTCs that start with U) that correspond to
"Suspension Control ECU Communication Stop Mode" in "DTC Combination
Table" are output.
Click here
|
- Absorber control ECU CAN branch line or connector
- Power source circuit of absorber control ECU
- Absorber control ECU ground circuit
- Absorber control ECU
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
HINT:
- Before disconnecting related connectors for inspection, push in on each
connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
|
1. | CHECK FOR OPEN IN CAN BUS LINES (ABSORBER CONTROL ECU BRANCH LINE) |
(a) Disconnect the cable from the negative (-) battery terminal.
| (b) Disconnect the K59 absorber control ECU connector. |
 |
|
*a | Front view of wire harness connector
(to Absorber Control ECU) | | |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|
K59-8 (CANH) - K59-7 (CANL) |
Cable disconnected from negative (-) battery terminal |
54 to 69 Ω |
| NG |
 | REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (ABSORBER CONTROL ECU) |
|
OK |
 | |
| 2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
| (a) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
K59-4 (GND) - Body ground |
Cable disconnected from negative (-) battery terminal |
Below 1 Ω | |
 |
|
*a | Front view of wire harness connector
(to Absorber Control ECU) | | |
(b) Reconnect the cable to the negative (-) battery terminal.
| (c) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Switch Condition |
Specified Condition | |
K59-1 (IGB) - Body ground |
Engine switch on (IG) |
11 to 14 V | |
 |
|
*a | Front view of wire harness connector
(to Absorber Control ECU) | | |
| OK |
| REPLACE ABSORBER CONTROL ECU |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
System Description
SYSTEM DESCRIPTION
BRIEF DESCRIPTION
(a)
The Controller Area Network (CAN) is a serial data communication system
for real time application. It is a vehicle multiplex communication
system which has a high communication speed and the ability to detect
malfunctions.
(b)
Using the CANH and CANL bus lines as a pair, CAN communication is
performed using a voltage differential. (A base voltage is applied to
the pair of lines and a voltage differential is created when
communicating.)
(c) Many ECUs or sensors installed to the vehicle operate by sharing information and communicating with each other.
(d) 2 resistors which are necessary for communication are used in a CAN bus main line.
DEFINITION OF TERMS
(a) Central bus
(1) The central bus is a term used to describe all buses directly connected to the central gateway ECU (network gateway ECU).
HINT:
A bus is displayed as Bus on the "Communication Bus Check" screen of the Techstream.
(b) Sub bus
(1)
A sub bus is a bus that has a gateway function equipped ECU in order to
communicate with the central bus and other sub buses.
HINT:
- A sub bus is displayed as Sub bus on the "Communication Bus Check" screen of the Techstream.
- When Sub bus is selected on the "Communication Bus Check" screen, ECUs
and sensors connected to non-CAN networks such as LIN may also be
displayed in addition to the ECUs and sensors connected to sub buses in
the CAN network.
(c) Local bus
(1)
A local bus is a bus that does not have the ability to communicate with
other buses. ECUs and sensors on a local bus can only communicate with
other ECUs and sensors on the same bus.
(d) CAN J/C
(1) A CAN junction connector is a connector that connects branch lines to a main bus.
(e) Main bus
(1) A main bus line is the wire harness that runs between the 2 terminating resistors of a bus.
(f) Branch
(1) A branch line is a wire harness that connects an ECU or sensor to a main bus line.
(g) Terminating resistors
(1)
Terminating resistors which maintain a stable signal inside the CAN bus
are installed. 2 resistors of 120 Ω each located at each end of the bus
are necessary.
