|
It is suspected that the power supply circuit to the ETACS-ECU is defective, or the wiring
harness between the SWS monitor and the ETACS-ECU or their connector(s) is damaged. If the battery
power supply circuit to the ECU (terminal No.20 of the ETACS-ECU) is damaged, also check the
power supply circuit from the ignition switch (IG1) (terminal No.8 of the ETACS-ECU), and repair
if necessary. If the earth circuit to the ECU (terminal No.3 of the ETACS-ECU) is defective,
also check the earth circuit to the signal (terminal No.56 of the ETACS-ECU), and repair if
necessary.
|
|
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
|
|
Q.
Is the check result normal?
|
|
Repair the defective connector.
|
|
|
|
(1)Remove the ETACS-ECU, and measure at the junction block side.
|
|
(2)Voltage between D-419 ETACS-ECU connector terminal No.20 and body earth OK: System voltage
|
|
Q.
Is the check result normal?
|
|
- Check the power supply line for open circuit.
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to use troubleshooting/Inspection Service Points ).
|
|
|
|
Repair the wiring harness.
|
|
|
|
(1)Remove the ETACS-ECU, and measure at the junction block side.
|
|
(2)Turn the ignition switch to the ON position.
|
|
(3)Voltage between D-419 ETACS-ECU connector terminal No.8 and body earth OK: System voltage
|
|
Q.
Is the check result normal?
|
|
- Check the power supply line for open circuit.
|
|
Q.
Is the check result normal?
|
|
Refer to GROUP 54A -
Ignition switch, Inspection procedure 2 "Malfunction
of the ignition switch power supply system ."
|
|
|
|
Repair the wiring harness.
|
|
|
|
(1)Remove the ETACS-ECU, and measure at the junction block side.
|
|
(2)Resistance between D-419 ETACS-ECU connector terminal No.3 and body earth OK: Continuity exists (2 Ω
or less)
|
|
(3)Resistance between D-420 ETACS-ECU connector terminal No.56 and body earth OK: Continuity exists (2 Ω
or less)
|
|
Q.
Is the check result normal?
|
|
- 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 use troubleshooting/Inspection Service Points ).
|
|
|
|
Repair the wiring harness.
|
|
|
|
Q.
Is the check result normal?
|
|
Repair the defective connector.
|
|
|
|
- Check the communication lines for open and short circuit.
|
|
Q.
Is the check result normal?
|
|
Repair the wiring harness.
|
|
|
|
OK: "OK" is displayed on the "ETACS ECU" menu.
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to use troubleshooting/Inspection Service Points ).
|
|
|