C1612

DTC C1612 CAN TIME-OUT TCU

COMPONENT LOCATION:

GENERAL DESCRIPTION
CAN communication is applied just for ESC (Electronic Stability Control) installed in the vehicle for sending requirement data, such as torque reduction, the number of fuel cut cylinders, and TCS control requests, to the Engine ECM & TCU. The Engine ECM performs fuel cut functions according to requests from the ABS ECU and retards ignition timing by torque reduction requests. The TCU maintains current gear positions during ESC control time, by not increasing power which causes a kickdown shift.

DTC DESCRIPTION
The HECU checks the CAN communication lines for normal ESC control, and sets this code if an TCU message is not received within 500 ms. The HECU does not detect this code until 3 seconds after the IG KEY is turned to ON.

DTC DETECTING CONDITION:

COMPONENT INSPECTION
1. Ignition "OFF".
2. Ignition "ON"
3. Does warning lamp remain On?
YES > Substitute with a known-good TCU and check for proper operation. If problem is corrected, replace TCU and then go to "Verification Of Vehicle Repair" procedure. If NG, replace HECU and then go to "Verification Of Vehicle Repair" procedure.
NO > Fault is intermittent caused by faulty TCU and/or faulty HECU or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using a scan tool, Clear DTC.
3. Operate the vehicle within DTC Detecting Condition in General Information.
4. Are any DTCs present?
YES > Go to the applicable troubleshooting procedure.
NO > System performing to specification at this time.