STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
(1) caution | To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position 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) Use scan tool (M.U.T.-IIISE) to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2. Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
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: Approximately system 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: Approximately system 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: Continuity exists (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