C1616

DTC C1616 CAN BUS OFF

COMPONENT LOCATION:

GENERAL DESCRIPTION
The HECU send requirement data, such as Torque reduction, the number of fuel cut cylinders, and TCS control requests, to the PCM (ECM & TCM) through CAN bus line. The PCM (ECM) performs fuel cut functions according to requests from the HECU and retards ignition timing by torque reduction requests. The PCM (TCM) maintains current gear positions during TCS control time, in order not to increase power which causes a Kickdown shift.

DTC DESCRIPTION
The HECU checks the CAN communication lines for normal TCS control, and sets this code if re-initialization is tried for 15 times in sequence without success.

DTC DETECTING CONDITION:

TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
> Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
> Go to "Power Circuit Inspection" procedure.

SIGNAL CIRCUIT INSPECTION
1. Ignition "OFF".
2. Measure resistance between terminal "14" of the HECU harness connector and terminal "35" of the HECU harness connector.
Specification: Approximately 60 Ohms





3. Is the measured resistance within specifications?
YES
> Fault is intermittent caused by open or short in CAN signal harness or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
NO
> Check for open or short in CAN signal harness between terminal "14" of the HECU harness connector and terminal "35" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode
2. Using a scantool, 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.