STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
(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)
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(2) Turn the power supply mode of the engine switch to ON.
(3) Diagnose the CAN bus line.
(4) Turn the power supply mode of the engine switch to OFF.
Is the CAN bus line found to be normal?
Go to Step 2. Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
STEP 2. Check of short to power supply, short of ground and open circuit in STP1 line between stop light switch connector and OSS-ECU connector
STEP 3. Check of short to power supply, short of ground and open circuit in STP line between stop light switch connector and ETACS-ECU connector
STEP 4. Using scan tool (M.U.T.-III), check other system data list.
STEP 5. Using scan tool (M.U.T.-III), check data list.
(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 the Scan Tool (M.U.T.-III)
."
(2) Turn the power supply mode of the engine switch to OFF.
(3) Check the OSS-ECU data list. | Operation state | Item No. | Check item | Display | Brake pedal is depressed | 3 | Stoplight switch | ON | Brake pedal released | OFF |
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Operation state | Item No. | Check item | Display |
Brake pedal is depressed | 3 | Stoplight switch | ON |
Brake pedal released | OFF |
OK: Operation state and data list display agree with each other.
Is the check result normal?
Go to Step 6. Replace the OSS-ECU and register the chassis number (Refer to ).
STEP 6. Recheck for diagnostic trouble code.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from OFF to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch from ON to OFF.
Is the DTC set?
Replace the OSS-ECU and register the VIN (Refer to ). Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).