STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics
(1) caution | To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (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 ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
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 the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC C1541 set?
Go to Step 3. This diagnosis is complete.
STEP 3. Check the battery voltage.
STEP 4. Check the charging system.
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 the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(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) 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. Scan tool (M.U.T.-III) data list
STEP 9. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC C1541 set?
Replace the EPS-ECU (Refer to ). Then go to Step 10. Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).
STEP 10. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC C1541 set?
Return to Step 1. This diagnosis is complete.