STEP 1. Using scan tool MB991958, read the other system diagnostic trouble code.
Check again if the DTC is set to the OSS-ECU.(1) caution | To prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (MB991958). |
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)
."
(2) Erase the DTC.
(3) Turn the power supply mode of the engine switch to ON.
(4) Check if DTC is set.
(5) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
Perform troubleshooting for the OSS-ECU (Refer to troubleshooting ). On completion, go to Step 2. Go to Step 2.
STEP 2. Using scan tool MB991958, read the diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.(1) caution | To prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (MB991958). |
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)
."
(2) Erase the DTC.
(3) Turn the power supply mode of the engine switch to ON.
(4) Check if DTC is set.
(5) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
Perform troubleshooting for the KOS-ECU (Refer to troubleshooting ). On completion, go to Step 3. Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.(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 to OFF.
Is the DTC set?
Replace KOS-ECU and register the ID codes (Refer to ). The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).