STEP 1. Voltage measurement at ETACS-ECU connector (ACC, ACCS terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "ACC" position.
(3) Check the voltage between the ETACS-ECU connector (ACC, ACCS terminal) and body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage)
Is the check result normal?
Go to Step 5. : Go to Step 2. : Go to Step 3.
STEP 2. Using scan tool (M.U.T.-IIISE), read the other system DTC.
(1) caution | To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE). |
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect Scan tool (M.U.T.-IIISE)
."
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the KOS&OSS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Diagnose the KOS&OSS-ECU. Refer to GROUP 42B, Troubleshooting . Go to Step 4.
STEP 3. Ignition switch check.
STEP 4. Check of short to power supply, short to ground, and open circuit in ACC, ACCS line between ignition switch (ACC) <Vehicles without KOS> or KOS&OSS-ECU (ACC) <Vehicles with KOS> and ETACS-ECU connector.
STEP 5. Using scan tool (M.U.T.-IIISE), check data list.
Check the input signals from the ignition switch (ACC).- Turn the ignition switch to the ACC position.
| Item No. | Item name | Normal condition | 111 | ACC switch | ON |
|
Item No. | Item name | Normal condition |
111 | ACC switch | ON |
OK: Normal condition is displayed.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ). Replace the ETACS-ECU.