Transfer System > Transfer Case Assembly > P0605 Internal Control Module Read Only Memory(ROM) Error

Component Location

General Description

ITCC(Intelligent Torque Control Coupling) 4WD:

Though CAN communication, ECM and TCM hold engin RPM, APS, step of trensmission, decreasing of torque in common and perform the active control .ITCC system has 4WD-LOCK function that can make driving force to 50:50 by compulsion according to driver's intention.

DTC Description

This DTC is set when inappropriate 4WD-ECM is detected(EEPROM checksum).If failure is detected "4WD-ECM" prohibits the "ITCC" control and vehicle is controlled with 2WD by intercepting EMC current.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

•	EEPROM Error

•	Connector looseness and poor terminal to wire connection.

•	Faulty 4WD-ECM .

Threshold Value

•	Can't read from EEPROM, can't write to EEPROM. Maintained 3 times.

Fail Safe

•	Change into 2WD mode.

Schematic Diagram

Signal Waveform And Data

Monitor Dtc Status

1.	Connect scantool to Data Link Connector(DLC).

2.	Warm up the engine to normal operating temperature.

3.	Monitor DTC(Diagnostics Trouble Code) on the scantool.

Is the same DTC displayed again?

	▶ Substitute with a known-good "4WD-ECM" and check for proper operation. If the problem is corrected, replace "4WD-ECM" and then go to "Verification of Vehicle Repair" procedure.
	▶ Fault is intermittent caused by poor contact in the sensor's and/or "4WD-ECM"s connector or was repaired and "4WD-ECM" memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage Repair or replace as necessary and 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 scan tool and select "Diagnostic Trouble Codes(DTCs)" mode

2.	Using a scantool, Clear DTC.

3.	Operate the vehicle within DTC Enable conditions in General information.

Are you DTCs present?

	▶ Go to the applicable troubleshooting procedure.
	▶ System performing to specification at this time.