STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics.
(1) caution | To 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) Turn on the power supply mode of the electric motor switch.
(3) Diagnose the CAN bus line.
(4) Turn off the power supply mode of the electric motor switch.
Is the check result normal?
Go to Step 3. Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check if the DTC is set.
Is DTC C1541 set?
Go to Step 3. This diagnosis is complete.
STEP 3. Check the 12V Starter Battery voltage.
STEP 4. Scan tool (M.U.T.-IIISE) data list.
STEP 5. Voltage measurement at the EPS-ECU connector (IG1, +BB, GND terminal).
(1) Measure the EPS-ECU voltage without disconnecting the connector (by backprobing).
(2) Turn on the power supply mode of the electric motor switch.
(3) Measure the voltage between the EPS-ECU connector (IG1 terminal) and the EPS-ECU connector (GND terminal) or body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
(4) Turn off the power supply mode of the electric motor switch.
(5) Measure the voltage between the EPS-ECU connector (+BB terminal) and the EPS-ECU connector (GND terminal) or body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 8. Go to Step 6.
STEP 6. Check of short to power supply, short to ground, and open circuit in +BB line between fusible link and EPS-ECU connector.
STEP 7. Check of short to power supply, short to ground, and open circuit in IG1 line between EPS-ECU connector and ETACS-ECU connector.
STEP 8. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check if the DTC is set.
Is DTC C1541 set?
Replace the EPS-ECU (Refer to ). Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).