STEP 2. Using scan tool (M.U.T.-III), communicates with this system.
Check that the communication with scan tool (M.U.T.-III) is possible.note | If ETACS-ECU is not active, OSS-ECU cannot communicate with the scan tool (M.U.T.-III). |
(1) caution | To prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (M.U.T.-III). |
Connect scan tool (M.U.T.-III). Refer to "How to connect scan tool (M.U.T.-III)

."
(2) Disconnect the negative battery terminal, and connect it again.
(3) After the negative terminal is connected, the OSS-ECU should communicate with the scan tool (M.U.T.-III) within approximately 30 seconds.
(4) Turn the power supply mode of the engine switch to OFF.
Is the check result normal?
Go to Step 3
.
Carry out the troubleshooting of "OSS-ECU power supply or ground circuit malfunction" (Refer to
).