P0605 Internal Control Module Read Only Memory(ROM) Error - Automotive Repair Guides & Equipment

COMPONENT LOCATION

GENERAL DESCRIPTION

A malfunction is detected by using a checksum technique for verifying data. The digital data is composed of zeros and ones. A checksum is the total of all ones in a string of data. By comparing the checksum value with a stored value, a malfunction can be detected.

DTC DESCRIPTION

If the RAM in the ECM has an errors or the CPU software version does not match the main CPU or real checksum does not match with the memory checksum, ECM sets P0605.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible Cause

DTC Strategy

Check internal CPU, RAM

1.	Faulty ECM

Enable Conditions

–

Threshold Value

RAM has errors

Discordance between the real checksum and the memorized checksum

The version discordance among PCU S/W or Calibration

Diagnostic Time

Continuous

MIL ON Condition

1 driving cycle

MONITOR GDS DATA

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

IG “ON”.

3.	Select “DTC” button, and then Press “DTC Status” to check DTC’s information from the DTCs menu.

4.	Read “DTC Status” parameter.

Is parameter displayed “Present fault”?

	▶ Go to “Terminal and Connector inspection” procedure.
	▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary

TERMINAL AND CONNECTOR INSPECTION

1.	Many malfunctions in the electrical system are caused by poor harness and terminal connections. 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.

Has a problem been found?

▶ Repair as necessary and go to “Verification of Vehicle Repair” procedure.

▶ Substitute with a known – good ECM and check for proper operation. If the problem is corrected, replace ECM and go to “Verification of Vehicle Repair” procedure.

There is a memory reset function on GDS that can erase optional parts automatically detected and memorized by ECM. Before or after testing ECM on the vehicle, use this function to reuse the ECM on the others.

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