ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION - Introduction
AT-7019prose procedureIntroduction
The CVT system has two self-diagnostic systems.
The first is the emission-related on board diagnostic system (EURO-OBD) performed by the TCM in combination with the ECM. The malfunction is indicated by the MI (malfunction indicator) and is stored as a DTC in the ECM memory but not the TCM memory.
The second is the TCM original self-diagnosis indicated by the SPORT indicator lamp. The malfunction is stored in the TCM memory. The detected items are overlapped with EURO-OBD self-diagnostic items. For detail, refer to AT-7030.
EURO-OBD Function for CVT System
The ECM provides emission-related on board diagnostic (EURO-OBD) functions for the CVT system. One function is to receive a signal from the TCM used with EURO-OBD-related parts of the CVT system. The signal is sent to the ECM when a malfunction occurs in the corresponding EURO-OBD-related part. The other function is to indicate a diagnostic result by means of the MI (malfunction indicator) on the instrument panel. Sensors, switches and solenoid valves are used as sensing elements.
The MI automatically illuminates in Two Trip Detection Logic when a malfunction is sensed in relation to CVT system parts.
EURO-OBD Diagnostic Trouble Code (DTC)
HOW TO READ DTC AND 1ST TRIP DTC
DTC and 1st trip DTC can be read by the following methods.
How to Read DTC and 1st Trip DTC
- 1(No Tools) The number of blinks of the malfunction indicator lamp in the Diagnostic Test Mode II (Self-Diagnostic Results) Examples: 0705, 0710, 0715, 0720, etc. For details, refer to EC section ["Malfunction Indicator (MI)", "ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION"]. These DTCs are controlled by NISSAN.
- 2(with CONSULT-II or GST) CONSULT-II or GST (Generic Scan Tool) Examples: P0705, P0710, P0720, P0725, etc. These DTCs are prescribed by ISO15031-6. (CONSULT-II also displays the malfunctioning component or system.)
1st trip DTC No. is the same as DTC No.
IMPORTANT
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-II can identify them as shown below. Therefore, using CONSULT-II (if available) is recommended.
A sample of CONSULT-II display for DTC is shown at left. DTC or 1st trip DTC of a malfunction is displayed in SELF-DIAGNOSTIC RESULTS mode for "ENGINE" with CONSULT-II. 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".