General Information

HOW TO READ DTC AND 1ST TRIP DTC
DTC and 1st trip DTC can be read by the following methods.

Without Scan Tools
The number of blinks of the malfunction indicator lamp in the Diagnostic Test Mode II (Self-Diagnostic Results).
Examples: 1101,1102,1103,1104, etc.
These DTCs are controlled by NISSAN.

With CONSULT
CONSULT or GST (Generic Scan Tool).
Examples: P0705, P0710, P0720, P0725, etc.
These DTCs are prescribed by SAE J2012.

With Generic Scan Tool
(CONSULT also displays the malfunctioning component or system.)
1st trip DTC No. is the same as DTC No.
Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction. However, in case of the Mode II and GST they do not indicate whether the malfunction is still occurring or occurred in the past and returned to normal.
CONSULT can identify them as shown below. Therefore, using CONSULT (if available) is recommended.






A sample of CONSULT display for DTC is shown at above. DTC or 1st trip DTC of a malfunction is displayed in SELF-DIAGNOSTIC RESULTS mode for "ENGINE" with CONSULT Time data indicates how many times the vehicle was driven after the last detection of a DTC.






If the DTC is being detected currently, the time data will be "0".






If a 1st trip DTC is stored in the ECM, the time data will be "[1t]".


FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM has a memory function, which stores the driving condition such as fuel system status, calculated load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed and vehicle speed at the moment the ECM detects a malfunction.

Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data, and the data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT or GST. The 1st trip freeze frame data can only be displayed on the CONSULT screen, not on the GST.

Only one set of freeze frame data (either 1st trip freeze frame data of freeze frame data) can be stored in the ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no longer stored. Remember, only one set of freeze frame data can be stored in the ECM.






The ECM has the above priorities to update the data.

Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM memory is erased.