C1607: Control unit error







caution
  • If the EPS-ECU sets the diagnosis code No. C1607, diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be set.
  • Before replacing ECU, ensure that the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS




  • The system data is not within the stored control range, and the microcomputer determines that an internal error has occurred.

PROBABLE CAUSES



  • Defective wiring harness or connector in the power supply circuit to EPS-ECU
  • Malfunction of the EPS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-114-1 EPS-ECU connector

Q. Is the check result normal?
Go to Step 2.
Repair the damaged connector.

STEP 2. Measure the resistance at B-114-1 EPS-ECU connector.
(1)Disconnect the connector and measure at the wiring harness side.
(2)Measure the resistance between B-114-1 EPS-ECU connector terminal No. 2 and the body earth.
OK: Continuity exists. (300 Ω or more)
(3)Measure the resistance between B-114-1 EPS-ECU connector terminal No. 1 and the body earth.
OK: Continuity exists. (300 Ω or more)

Q. Is the check result normal?
Go to Step 3.
Replace the steering gear & linkage assembly.

STEP 3. Diagnosis code recheck
Recheck if the diagnosis code is set.
(1)Erase the stored diagnosis code.
(2)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
(3)Check if the diagnosis code No. C1607 is set.

Q. Is diagnosis code C1607 set?
Replace EPS-ECU.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .))