|
It is suspected that the power
supply circuit to the ETACS-ECU is defective, or the wiring
harness between the diagnosis connector and the ETACS-ECU or
their connector(s) is damaged.
|
|
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
|
|
Use the M.U.T.-III to confirm that
it communicates with the engine-ECU.
|
|
Q.
Is the check result normal?
|
|
Diagnose the system,
which cannot communicate with the M.U.T.-III.
|
|
|
|
When the ignition switch is turned
ON, check if the M.U.T.-III can communicate with the
system.
|
|
Q.
Is the check result normal?
|
|
Refer to Inspection
Procedure A-2 "When the ignition switch is at the LOCK (OFF)
position, the functions do not work normally. Check the
battery power supply circuit to the ETACS-ECU ."
|
|
|
![](../../../img/54/AC313421AB00ENG.png)
|
Q.
Is the check result normal?
Go to Step
4.
Repair
the defective connector.
|
![](../../../img/54/AC313421AB00ENG.png)
|
(1)Disconnect the connector, and
measure at the junction block side.
|
![](../../../img/54/AC310506DB00ENG.png)
|
(2)Resistance between C-221
ETACS-ECU connector terminal No.56 and body
earth OK: 2 Ω or less
Q.
Is the check result normal?
Go to Step
6.
Go to Step
5.
|
![](../../../img/54/AC313421AB00ENG.png)
|
- Check the earth wires for open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
Repair the wiring
harness.
|
![](../../../img/54/AC313416AG00ENG.png)
|
Q.
Is the check result normal?
Go to Step
7.
Repair
the defective connector.
|
![](../../../img/54/AC313416AG00ENG.png)
![](../../../img/54/AC313421AB00ENG.png)
|
- Check the communication lines for open
circuit.
Q.
Is the check result normal?
Go to Step
8.
Repair
the wiring harness.
|
|
Check whether the communication
with the M.U.T.-III is possible.
|
|
Q.
Is the check result normal?
|
|
The trouble can be
an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
|
|
|