DIAGNOSTIC TROUBLE CODE (DTC) - P0605 ENGINE CONTROL MODULE NMVY WRITE ERROR

 

Know your Circuit

 

 

  • The nerve center of the fuel injection system is the engine control module (ECM)
  • The ECM constantly supervises the information from various sensors, and regulates the systems that start after vehicle performance.
  • The ECM is also empowered to control all the diagnostic functions of the system.
  • It can detect operational flaws and caution the driver through the Malfunction Indicator Lamp (MIL)
  • It also records and stores a Diagnostic Trouble Code (DTC) which detects the likely problem- making parts to help the technician while repairing.
  • In order to house the program information and the calibrations required for engine, trans-axle diagnostics operation an electrically erasable programmable read only memory (EEPROM) is used.
  • For detecting errors in the software the ECM uses a specially devised value known as the checksum.
  • The checksum (self explanatory) is a value that is the combination of all the numbers in the software added together.
  • If the values recorded by the ECM and the checksum do not match then a checksum error is highlighted.

Pre-requisites for setting the DTC

 

·   The ECM is capable of detecting more than 3 incorrect checksum.

 

 

What happens when DTC sets?

When will  MIL/ DTC clear?

1) The Malfunction Indicator Lamp (MIL) will glow.

1) The MIL will turn off after four successive ignition cycles in which the diagnostic runs flawlessly.

 

2) The information which the ECM records of the operating conditions at the time the diagnostic fails will be stored in the Freeze Frame and Failure   Records will buffer.

 

2) A history DTC will automatically clear after 40 repetitive warm-up cycles without any fault.

 

3) A history DTC is stored.

 

3)   DTC(s) can be cleared by using the scan tool.

         

4) The coolant fan turns on

-

 

 

SUMMARY OF THE STEPS TO BE TAKEN

DTC - P0605 ENGINE CONTROL MODULE NMVY WRITE ERROR

 

Step

Process

R    E     S

U    L    T

1

 

Run an EOBD System Check.

Task Done?

IF YES

THEN

 

 

 

Follow Step 2

IF NO

 THEN

  Go to "On-Board Diagnostic System Check"

2

Change the ECM.

Is the change made?

IF YES

 THEN

 Follow Step 3

-

3

1     Using the scan tool, clear the DTCs.

2         Start the engine and idle at normal operating temperature.

3         Run the vehicle within the conditions specified for setting this DTC .

Does the scan tool say that this diagnostic has been run and passed?

IF YES

THEN

Follow Step 4

IF NO

 THEN

 Follow Step 2

4

See  if any additional DTCs are set.

Are there any undiagnosed DTCs shown?

IF YES

 THEN

 Go to applicable DTC table

The System  of your car is fine