On Board Diagnostic (OBD) System: Introduction
WARNING: This page is about a different car, the 2011 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actuators. The ECM also records various emission-related diagnostic information including:
EMISSION-RELATED DIAGNOSTIC INFORMATION CHART
| Emission-related diagnostic information | Diagnostic service |
|---|---|
| Diagnostic Trouble Code (DTC) | Service $03 of SAE J1979 |
| Freeze Frame data | Service $02 of SAE J1979 |
| System Readiness Test (SRT) code | Service $01 of SAE J1979 |
| 1st Trip Diagnostic Trouble Code (1st Trip DTC) | Service $07 of SAE J1979 |
| 1st Trip Freeze Frame data | |
| Test values and Test limits | Service $06 of SAE J1979 |
| Calibration ID | Service $09 of SAE J1979 |
The above information can be checked using procedures listed in the table below.
DTC CHART
| x: Applicable -: Not applicable | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| DTC | 1st trip DTC | Freeze Frame data | 1st trip Freeze Frame data | SRT code | SRT status | Test value | |||
| CONSULT-III | x | x | x | x | x | x | - | ||
| GST | x | x | x | - | x | x | x | ||
| ECM | x | x(1) | - | - | - | x | - | ||
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