STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
STEP 2. DTC recheck after resetting CAN bus lines
(1) Erase the DTC.
(2) Engine start
(3) Check if the DTC is set.
Is DTC C1541 set?
Go to Step 3. This diagnosis is complete.
STEP 3. Voltage measurement at the EPS-ECU connector (+BB, GND terminal)
(1) Measure the EPS-ECU voltage without disconnecting the connector (by backprobing).
(2) Engine start
(3) Measure the voltage between the EPS-ECU connector (+B 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 6. Go to Step 4.
STEP 4. Check the fusible link.
STEP 5. Check of short to power supply, short to ground, and open circuit in +B line between fusible link and EPS-ECU connector
STEP 6. Voltage measurement at the EPS-ECU connector (IG1, GND terminal)
(1) Measure the EPS-ECU voltage without disconnecting the connector (by backprobing).
(2) Engine start
(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)
Is the check result normal?
Go to Step 8. Go to Step 7.
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. Resistance measurement at the EPS-ECU connector (GND terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance between the EPS-ECU connector (GND terminal) and body groundOK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 10. Go to Step 9.
STEP 9. Check of open circuit in GND line between EPS-ECU connector and body ground.
STEP 10. Retest the system