[Previous][Next]
DTC U1000: OSS CAN timeout
 
 
caution
  • If DTC No. U1000 is set, be sure to diagnose the CAN bus line.
  • Before replacing the ECU or combination meter, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
DIAGNOSTIC FUNCTION
If the signal from OSS-ECU cannot be received, the combination meter sets DTC No. U1000.
 
 
DTC SET CONDITIONS
With the electric motor switch is at ON position, DTC No. U1190 is not set and DTC No. U1195 is not set, if the communication with OSS-ECU cannot be established for 2500 ms or more, the combination meter determines that a problem has occurred.
 
 
TROUBLESHOOTING HINTS
  • The CAN bus line may be defective
  • The OSS-ECU may be defective
  • The combination meter may be defective
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Press the electric motor switch to turn on the power supply mode.
(3) Diagnose the CAN bus line.
(4) Press the electric motor switch to turn off the power supply mode.
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. Using scan tool (M.U.T.-IIISE), read the other system DTC.
Check if DTC is set in the OSS-ECU.
Is the DTC set?
Troubleshoot the OSS-ECU (Refer to GROUP 42B - Troubleshooting ).
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-IIISE), read the other system DTC.
Check if a DTC, which relates to CAN communication-linked systems below, is set.
  • ETACS-ECU
    • DTC No.U1000: OSS CAN timeout
Is the DTC set?
Go to Step 4.
Go to Step 5.
 
STEP 4. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Press the electric motor switch to turn the power supply mode from "OFF" to "ON."
(3) On completion, check that the DTC is not set again.
Is the DTC set?
Replace OSS-ECU.
A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the OSS-ECU and the combination meter (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
 
STEP 5. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Press the electric motor switch to turn the power supply mode from "OFF" to "ON."
(3) On completion, check that the DTC is not set again.
Is the DTC set?
Replace combination meter.
A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the OSS-ECU and the combination meter (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).