Nissan Versa
Sedan Service Manual
Engine » Engine control system (EC) » Ecm
Fail Safe

NON DTC RELATED ITEM

Detected items

Engine operating condition in failsafe mode

Remarks

Malfunction indicator lamp circuit

Engine speed will not rise more than 2,500 rpm due to the fuel cut

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is malfunction on engine control system.

Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means of operating fail safe function.

The fail safe function also operates when above diagnoses except MIL circuit are detected and demands the driver to repair the malfunction.

DTC RELATED ITEM

DTC RELATED ITEM

DTC Inspection Priority Chart

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart.

DTC Inspection Priority Chart

DTC Index

DTC Index

*1: 1st trip DTC No. is the same as DTC No.

*2: This number is prescribed by SAE J1979/ ISO 150315.

*3: In Diagnostic Test Mode II (Selfdiagnostic results), this number is controlled by NISSAN.

*4: Refer to EC, "Description".

*5: The troubleshooting for this DTC needs CONSULT.

*6: When the failsafe operations for both selfdiagnoses occur, the MIL illuminates.

*7: This selfdiagnosis is not for ECM power supply circuit, even though "ECM BACK UP/CIRCUIT" is displayed on CONSULT screen.

*8: SRT code will not be set if the selfdiagnostic result is NG.

*9: A/T models or CVT models.

*10: M/T models.

Test Value and Test Limit

The following is the information specified in Service $06 of SAE J1979/ISO 150315.

The test value is a parameter used to determine whether a system/circuit diagnostic test is OK or NG while being monitored by the ECM during selfdiagnosis. The test limit is a reference value which is specified as the maximum or minimum value and is compared with the test value being monitored.

These data (test value and test limit) are specified by On Board Monitor ID (OBDMID), Test ID (TID), Unit and Scaling ID and can be displayed on the GST screen.

The items of the test value and test limit will be displayed with GST screen which items are provided by the ECM. (e.g., if bank 2 is not applied on this vehicle, only the items of bank 1 are displayed)

Test Value and Test Limit